WO2023160613A1 - Mooring chain steel and production method therefor, and mooring chain and production method therefor - Google Patents

Mooring chain steel and production method therefor, and mooring chain and production method therefor Download PDF

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WO2023160613A1
WO2023160613A1 PCT/CN2023/077888 CN2023077888W WO2023160613A1 WO 2023160613 A1 WO2023160613 A1 WO 2023160613A1 CN 2023077888 W CN2023077888 W CN 2023077888W WO 2023160613 A1 WO2023160613 A1 WO 2023160613A1
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steel
mooring chain
chain
production method
mooring
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PCT/CN2023/077888
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French (fr)
Chinese (zh)
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殷匠
高欣
邱海东
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上海茵矩材料科技有限公司
江阴南工锻造有限公司
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Publication of WO2023160613A1 publication Critical patent/WO2023160613A1/en

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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/04Fastening or guiding equipment for chains, ropes, hawsers, or the like
    • B63B21/10Fairleads
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/008Ferrous alloys, e.g. steel alloys containing tin
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/60Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Definitions

  • the invention relates to the technical field of low alloy steel and the field of marine engineering accessories, in particular to a mooring chain steel and its production method, as well as the mooring chain and its production method.
  • Mooring chain steel finger diameter in Between the mooring chains with round steel. Because the mooring chain is immersed in seawater for a long time and the service environment is harsh, the mooring chain steel must have high strength, good toughness, seawater corrosion resistance, hydrogen evolution embrittlement resistance, fatigue resistance, wear resistance and other characteristics. In addition, in practical applications, it is usually bent into a ring, and the mooring chain steel needs to have good hot bending and welding properties.
  • the target composition of R4 grade mooring chain steel with million-ton production is 0.22Mn1.5Cr0.8Ni0.8Mo0.45Nb0.03, provided by Shanghai No. 5 Iron and Steel Works (Liu Yongxin, Xu Yun, Chen Yifeng, Zhao Ronghua, The optimization of the heat treatment process parameters of the four-grade anchor chain steel, "Thermal Processing Technology" 1990No533 ⁇ 35), has been used in China for decades. Due to the large diameter of the offshore mooring chain link, the quenching and cooling conditions are limited. In order to ensure the hardenability of the chain link and obtain stable strength and toughness, the MnCrNiMo composition of the R4 chain steel products of various steel companies has not changed significantly over the years. . Although there were 5 patents on R4 grade chain steel published from 1998 to 2015, among which the Chinese patent application No. 98110160.7 stipulated that the upper limit of Mn was 1.90wt%, in fact, none of these patents had practical records.
  • the object of the present invention is to provide a kind of mooring chain steel, on the basis of improving the cost performance of R3, R4, R4S grade mooring steel, utilize Mn to affect the bay effect of the continuous cooling curve of structural steel, that is, the law of influence is similar to Mo, When the alloy Mn content increases to a certain amount, the continuous cooling curve of the steel begins to appear a river bend.
  • the composition system of increasing the cheap elements Mn and Al and reducing the precious elements Mo and Ni is designed. After the trial production of steel and chain, The effect of reducing the cost of chain products and improving their strength and toughness is obtained.
  • the present invention provides a mooring chain steel, the composition content of which is C 0.18 ⁇ 0.32, Mn 1.95 ⁇ 2.60, Si 0.15 ⁇ 0.50, Cr 0.45 ⁇ 1.20, Mo 0.008 ⁇ 0.250, Ni 0.02 ⁇ 1.20, Cu ⁇ 0.40, S ⁇ 0.005, Al 0.005 ⁇ 0.250, (V+Ti+Nb) ⁇ 0.35, (Sn+As+Sb) ⁇ 0.06, N 0.004 ⁇ 0.024, O ⁇ 0.002, H ⁇ 0.00015, the balance is Fe and unavoidable impurities.
  • the composition of the present invention the amount of Mn is higher than that of the prior art.
  • the amount of Al is higher than that of the prior art, the amount of Mo is lower than that of the prior art, and the amount of Cr and Ni is lower than or equal to the prior art.
  • manganese is lower than 1.95%, the above effects cannot be achieved; if it is higher than 2.60%, the segregation of components will not be easily reduced or eliminated, thus affecting the structure and mechanical properties, the uniformity of process performance and other additional properties, such as hydrogen embrittlement susceptibility.
  • steel and chains contain more than 1.95% manganese, and the content of martensite in the structure does not increase but decreases. Due to the reasonable combination of soft and hard phases, the yield ratio of quenched-high temperature tempered steel is controllable; the steel with composite bainite (BU+BL+M) structure, the edge and center of the cross-section of the chain, the base metal and The strength difference of the weld seam is greatly reduced.
  • the steel of the present invention in which the increased amount of manganese is combined with other elements can also increase and stabilize the phase transformation temperature of austenite during cooling from the austenitizing temperature, Increase the volume fraction of bainite in the matrix of the bainite/martensite quenching structure, expand the cooling rate range for the stable formation of bainite phase, and overcome the high crack sensitivity and heat treatment sensitivity of ultra-high-strength steel, especially for large diameter
  • the difficult problem of poor productivity of chain continuous heat treatment has created conditions for satisfying the controllable low yield ratio of the invented steel after tempering.
  • the reduction of the carbide-forming element chromium and the reduction of the M3C type carbide FeCr3C are beneficial to reduce the micro-battery effect and improve the corrosion performance.
  • Silicon can improve the strength and hardenability of steel, and has the same deoxidation effect as manganese, and can improve the corrosion performance of steel and chains in seawater.
  • the present invention controls its residual content to be 0.15% or above. However, if the silicon content is too high, the toughness will be affected. Therefore, its upper limit is set at 0.50%.
  • Chromium is also the main element to improve the strength and hardenability of chain steel, increase tempering stability and corrosion resistance in seawater.
  • the chromium content should not be lower than 0.45%. Since a large amount of manganese has been added to the steel of the present invention, considering the cost and effect, the upper limit is 1.20%.
  • the nickel content of chain steel above grade 4 shall not be less than 0.20%.
  • Nickel is not easy to burn out during flash welding, which is beneficial to improve the uniformity of the weld. But the content is too high to increase the cost.
  • SCC stress corrosion
  • the steel of the present invention stipulates that the addition amount shall not exceed 1.20%.
  • the carbon equivalent (Ceq) coefficient of nickel is low, and it can be used to balance Ceq if necessary, so as not to make Ceq too high.
  • Nickel improves the hardenability, and ensures good strain-slip ability of the link, including the weld joint, and reduces the brittle transition temperature, which is beneficial to improve the low-temperature toughness of the link weld. Its solid solution strengthening effect is weak.
  • Molybdenum delays the ferrite-pearlite transformation of steel, prevents temper brittleness, and significantly improves the impact toughness of steel. Molybdenum also improves the corrosion resistance of steel, and is an element that is not easily burned during flash welding. Molybdenum, molybdenum and chromium, especially the combination with manganese can stabilize the bainite content, control the bainite/martensite ratio, increase the phase transition temperature, reduce the crack sensitivity, and benefit the stability and buckling of the cross-section of the link. Stronger control. Since molybdenum is classified as a precious element, it increases the cost of steel.
  • the present invention substitutes manganese for molybdenum, reducing the amount of molybdenum by more than half. (V+Ti+Nb) ⁇ 0.35%
  • V, titanium Ti, and niobium Nb have the effects of strengthening, refining, and hydrogen trapping, and they are also commonly used elements in marine chain steel in the past 10 years. Due to factors such as raw materials and furnace lining, titanium is unavoidable.
  • vanadium is used as a strengthening element to form extremely fine VCN of 1 to 4 nm.
  • These VCNs are not only high-energy strong hydrogen traps, which can limit the diffusion of hydrogen embrittlement steel, but also increase the micro-zone yield strength, reduce the local hydrogen accumulation caused by micro-zone strain (micro-yield), and reduce the HE sensitivity on the other hand. sex.
  • niobium can supplement the deficiency of aluminum (AlN) and titanium (TiN) refinement. Considering the cost factor, it is stipulated that the sum of the three shall not exceed 0.35%. Cu ⁇ 0.40%,
  • Aluminum is the main deoxidizing element, and it can form AlN, refine grains, and a small amount of aluminum can improve the comprehensive mechanical properties of the chain base material and weld. When aluminum exceeds 0.2%, it can also improve the corrosion resistance of steel. When niobium is used to refine the grains of alloy structural steel, the role of aluminum can only be deoxidation, and the residual aluminum is allowed to be not less than 0.005% when the steel is lifted.
  • the implementation of the present invention shows the corrosion resistance tendency of aluminum in seawater, and limits it to ⁇ 0.250%, and controls restrain its influence on the phase transition.
  • the premise of applying higher aluminum is that the flash butt welding process is in place, and the size and quantity of oxide inclusions in the weld joint are limited to not exceed the normal level.
  • Nitrogen in steel is unavoidable, and fixed into AlN, TiN, VN, NbN can prevent strain aging, refine grains and/or increase strength. Smelting engineers to reduce the oxygen, hydrogen and nitrogen targets of structural steel. However, the inventors feel that the potential of oxygen in the compound existing as a solid phase transition core and nitrogen as a light element has yet to be brought into play through practical applications. In the process of nitrogen utilization, it is necessary to prevent excessive free nitrogen or solid solution nitrogen from forming pores during the solidification of molten steel, and to prevent the precipitation of microalloy nitrides from increasing crack sensitivity. The invention allows the actual nitrogen content of product steel and chain to be 0.004-0.024wt%.
  • Tramp elements such as antimony, arsenic, and tin also embrittle the grain boundaries of prior austenite, reduce toughness, and may cause hot working cracks when the content is large. Although it is hoped that the lower the better, considering the cost of industrial products, the total amount is allowed to be no more than 0.06%.
  • the second object of the present invention is to provide a kind of production method of above-mentioned mooring chain steel, comprising the following steps,
  • the mass percentage of the tapping composition is: C 0.18 ⁇ 0.32, Mn 1.95 ⁇ 2.60, Si 0.15 ⁇ 0.50, Cr0.45 ⁇ 1.20, Mo 0.008 ⁇ 0.250, Ni 0.02 ⁇ 1.20, Cu ⁇ 0.40, S ⁇ 0.005, Al 0.005 ⁇ 0.250, (V+Ti+Nb) ⁇ 0.35, (Sn+As+Sb) ⁇ 0.06, N 0.004 ⁇ 0.024, O ⁇ 0.002, H ⁇ 0.00015, the balance is Fe and unavoidable impurities;
  • the metal raw material used in the primary smelting process of an electric furnace or a converter is molten iron, One or a mixture of any two or more of pig iron, steel scrap, ferroalloy, sponge iron, metal oxide and ore.
  • step S2 the ratio of the cross-sectional area of the steel ingot to the cross-sectional area of the finished round steel is ⁇ 7.
  • step S3 After step S3, step S4 is also included, after the round steel is straightened and grinded or turned by a grinding wheel, flaw detection, sampling and testing are carried out according to classification society specifications.
  • the third object of the present invention is a mooring chain, which is prepared by using the round steel made of the mooring chain steel mentioned above.
  • ABS American Bureau of Shipping
  • DNVGL Det Norske Veritas
  • Rm tensile strength
  • Rp0.2 conditional yield strength
  • YR yield ratio
  • Aim value target value
  • A elongation
  • Z section Shrinkage
  • CVN Charpy V-notch impact energy
  • B ring back
  • W weld.
  • YR this patent selects a more demanding ABS target value.
  • the fourth object of the present invention is to provide a production method of the above-mentioned mooring chain.
  • the mooring chain adopts the above-mentioned mooring chain steel, which is sequentially cut, heated at 950-850°C, and bent at 900-800°C. °C, temperature measurement, flash butt welding, and finally weaving chains; among them, the braided chains are heat treated in batch or vertical continuous tempering furnaces, and their accessories are heat treated in batch tempering furnaces.
  • the heat treatment steps are: firstly carry out at least one quenching treatment, each time the quenching temperature is >890°C, water cooling, the water temperature is less than 50°C; after the quenching treatment, tempering treatment is carried out, the tempering temperature is 570-650°C, water cooling or air cooling.
  • the braided chain and its accessories are quenched twice in a batch or vertical continuous tempering furnace.
  • the first production covers the diameter range required by the market, which improves performance and reduces costs
  • the steel of the present invention is applied to flash butt welding workpieces for the first time to obtain stable and tough welds.
  • One of the reasons is that, Compared with C0.22MnCrNiMo steel, increasing Mn and reducing Mo, Cr, and Ni reduces the thermal deformation resistance of link flash butt welding by 6-16%, and it is easy to form a well-bonded tight weld, and the decrease rate of weld toughness is greatly reduced.
  • the allowable final close upsetting temperature of the R4 steel of the present invention is about 750 ⁇ 850°C; while the final close upsetting temperature allowed by traditional R4 steel is about 800-850°C;
  • the problem can be solved by adjusting the tempering parameters within the fluctuation range of the high temperature tempering temperature ⁇ 30°C; Mass production management, reducing manufacturing costs, improving efficiency, and realizing the management revolution of chain steel production and chain ring manufacturing;
  • Quenching is relatively uniform in the cross-sectional performance of the present invention in the phase transformation of the bainite region; the present invention has NbCN, AlN, TiN alone or a combination of multiple methods to prevent the growth of austenite grains to choose from, improving the comprehensive performance and reduced EAC sensitivity;
  • Table 1 Steelmaking composition of the embodiment of the present invention and comparative example, wt%
  • the production method of the mooring chain steel in embodiment 1 ⁇ 8 is as follows:
  • the mass percentage of the tapping composition is: C 0.18 ⁇ 0.32, Mn 1.95 ⁇ 2.60, Si 0.15 ⁇ 0.50, Cr0.45 ⁇ 1.20, Mo 0.008 ⁇ 0.250, Ni 0.02 ⁇ 1.20, Cu ⁇ 0.40, S ⁇ 0.005, Al 0.005 ⁇ 0.250, (V+Ti+Nb) ⁇ 0.35, (Sn+As+Sb) ⁇ 0.06, N 0.004 ⁇ 0.024, O ⁇ 0.002, H ⁇ 0.00015, the balance is Fe and unavoidable impurities; electric furnace, primary refining
  • the metal raw materials used in the process are molten iron, pig iron, scrap steel, ferroalloy, ore, etc.
  • the round steel prepared by the above-mentioned production method for the mooring chains of Examples 1 to 8 is sequentially cut, heated at 950-900°C, bent at 850-800°C, temperature measured, flash-butt welded, chain-braided, and bottomed.
  • the heat treatment steps are: heating to 920°C for water-cooling and quenching, and the water temperature is less than 50°C; reheating to 610°C for tempering, and water cooling.
  • Embodiment 1 ⁇ 8 and comparative example 1 ⁇ 6 are now carried out the mechanical performance detection under the same conditions, and the detection results are shown in Table 2
  • Comparative Examples 3, 4, and 5 have been used consistently for decades. Compared with the embodiment, the contents of the precious alloy elements Mo and Ni are increased by about one time respectively, and the cost will increase correspondingly.
  • the yield strength ratio YR of Comparative Examples 1 and 5 exceeds the ABS standard of the American Bureau of Shipping. Comparative examples 2, 3, and 4 are R4 chains whose tensile strength is lower than the standard. Comparative example 6 is an R3 grade chain, and its toughness is unqualified.
  • the weld seam toughness reduction rate of the comparative example is 42-73%, and the Mn content of the comparative example exceeds the upper and lower limits of the scope of the invention respectively. Even with the addition of elements Cr and Ni, the mechanical properties (yield ratio or tensile strength or toughness) are still unqualified.
  • Table 3 is the corrosion rate trend and environmental crack resistance performance table in the seawater of embodiment 5 and 7
  • the internal hydrogen of the steel and the chain is at a very low level; the corrosion rate tends to decrease with the increase of Al and Cu; the corrosion rate in the deep-sea anoxic environment decreases by an order of magnitude; the data of environmental crack sensitivity is provided.
  • Table 4 is the hardness (wt %) of r/3 of embodiment and comparative example cross-section and core portion

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
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  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The present invention relates to a mooring chain steel and a production method therefor. The mooring chain steel comprises the following components, in percentages by mass: C: 0.18-0.32, Mn: 1.95-2.60, Si: 0.15-0.50, Cr: 0.45-1.20, Mo: 0.008-0.250, Ni: 0.02-1.20, Cu≤0.40, S≤0.005, Al: 0.005-0.250, (V+Ti+Nb)≤0.35, (Sn+As+Sb)≤0.06, N: 0.004-0.024, O≤0.002, H≤0.00015 and the balance of Fe and inevitable impurities. On the basis of improving the cost performance of R3, R4 and R4S grade mooring steel, by utilizing a river-bay effect of a continuous cooling curve of structural steel influenced by Mn, namely similar to the influence rule of Mo, as the content of alloy Mn is increased to a certain amount, the continuous cooling curve of the steel begins to appear in a river bend shape, a component system for increasing cheap elements Mn and Al and reducing precious elements Mo and Ni is designed, and by means of trial production of the steel and a chain, the effects of reducing the cost of a chain product and improving the strength and toughness thereof are achieved. The present invention also relates to a mooring chain and a production process therefor.

Description

一种系泊链钢及生产方法以及系泊链及生产方法A kind of mooring chain steel and its production method, as well as the mooring chain and its production method
本申请要求于2022年02月23日提交中国专利局、申请号为CN202210167428.X、发明名称为“一种系泊链钢及生产工艺以及系泊链及生产工艺”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。This application claims the priority of the Chinese patent application submitted to the China Patent Office on February 23, 2022, with the application number CN202210167428.X, and the title of the invention "a mooring chain steel and its production process, and the mooring chain and its production process" , the entire contents of which are incorporated in this application by reference.
技术领域technical field
本发明涉及低合金钢技术领域和海工附件领域,具体为一种系泊链钢及生产方法以及系泊链及生产方法。The invention relates to the technical field of low alloy steel and the field of marine engineering accessories, in particular to a mooring chain steel and its production method, as well as the mooring chain and its production method.
背景技术Background technique
系泊链钢指直径在之间的系泊链用圆钢。由于系泊链长期浸泡在海水中,服役环境恶劣,系泊链钢必须具有强度高、韧性好,耐海水腐蚀、抗析氢脆化、抗疲劳、耐磨损等特性。此外,实际应用中通常还要将其弯曲加工成环,系泊链钢还需具备良好热弯及焊接性能。Mooring chain steel finger diameter in Between the mooring chains with round steel. Because the mooring chain is immersed in seawater for a long time and the service environment is harsh, the mooring chain steel must have high strength, good toughness, seawater corrosion resistance, hydrogen evolution embrittlement resistance, fatigue resistance, wear resistance and other characteristics. In addition, in practical applications, it is usually bent into a ring, and the mooring chain steel needs to have good hot bending and welding properties.
百万吨级产量的R4级系泊链钢现有产品的目标成分为0.22Mn1.5Cr0.8Ni0.8Mo0.45Nb0.03,由上海第五钢铁厂提供(刘永新,徐芸,陈益丰,赵荣华,四级锚链钢热处理工艺参数的优选,《热加工工艺》1990No533~35),已经在国内使用了数十年。由于海工系泊链环直径较大,淬火冷却条件受限,为了保证链环的淬透性从而获得稳定的强韧性,长年来各钢企的R4级链钢产品的MnCrNiMo系成分无明显变动。虽然从1998至2015年有5项R4级链钢的专利公开,其中中国专利申请号98110160.7规定Mn的上限1.90wt%,实际上这些专利均无实用记录。The target composition of R4 grade mooring chain steel with million-ton production is 0.22Mn1.5Cr0.8Ni0.8Mo0.45Nb0.03, provided by Shanghai No. 5 Iron and Steel Works (Liu Yongxin, Xu Yun, Chen Yifeng, Zhao Ronghua, The optimization of the heat treatment process parameters of the four-grade anchor chain steel, "Thermal Processing Technology" 1990No533~35), has been used in China for decades. Due to the large diameter of the offshore mooring chain link, the quenching and cooling conditions are limited. In order to ensure the hardenability of the chain link and obtain stable strength and toughness, the MnCrNiMo composition of the R4 chain steel products of various steel companies has not changed significantly over the years. . Although there were 5 patents on R4 grade chain steel published from 1998 to 2015, among which the Chinese patent application No. 98110160.7 stipulated that the upper limit of Mn was 1.90wt%, in fact, none of these patents had practical records.
论文Tom Lassen,Agder,Jose L.Arana,Luis Canada,Jan Henriksen,Nina Kholthe,CRACK GROWTH IN HIGH STRENGTH CHAIN STEEL SUBJECTED TO FATIGUE LOADINGIN A CORROSIVE ENVIRONMENT,Proceedings of OMAE200524th International Conference on Offshore Mechanics and Arctic Engineering(OMAE 2005)June 12-17,2005,Halkidiki,Greece,OMAE2005-67242,发表了R4S级系泊链的成分:0.23Mn1.3Cr1.0Ni1.0Mo0.5V0.09,除了加入微合金元素V,该成分与上述上海第五钢铁厂的R4级链钢相似。就R3、R4、R4S级链而言,至今未见有能满足其性价比需要的新型高强韧钢。而对于大直径的R3、R4、R4S级链,则上述钢 号并不能满足。Paper Tom Lassen, Agder, Jose L. Arana, Luis Canada, Jan Henriksen, Nina Kholthe, CRACK GROWTH IN HIGH STRENGTH CHAIN STEEL SUBJECTED TO FATIGUE LOADINGIN A CORROSIVE ENVIRONMENT, Proceedings of OMAE200524th International Conference on Offshore Mechanics and Arctic Engineering (OMAE 2005) June 12-17, 2005, Halkidiki, Greece, OMAE2005-67242, published the composition of R4S grade mooring chain: 0.23Mn1.3Cr1.0Ni1.0Mo0.5V0.09, except for the addition of microalloying element V, the composition is the same as the above Shanghai The R4 grade chain steel of the Fifth Iron and Steel Works is similar. As far as R3, R4, and R4S grade chains are concerned, there is no new type of high-strength and tough steel that can meet their cost-effective requirements. For large diameter R3, R4, R4S grade chains, the above steel No. is not satisfied.
另外,系泊链钢锭、连铸坯的裂纹也始终是影响生产效率和成本的难题(例如曾海霞,杨佳,R4级系泊链钢裂纹原因分析,特钢技术,25(2019)No2)),多年来并无全面解决方法。In addition, cracks in mooring chain steel ingots and continuous casting slabs have always been a problem that affects production efficiency and cost (such as Zeng Haixia, Yang Jia, Analysis of cracks in R4 mooring chain steel, Special Steel Technology, 25 (2019) No2)), There has been no comprehensive solution for many years.
发明内容Contents of the invention
本发明的目的在于提供一种系泊链钢,以提高R3、R4、R4S级系泊钢的性价比为基础,利用Mn影响结构钢连续冷却曲线的河湾效应,即与Mo的影响规律相似,随着合金Mn含量增加到一定量时,钢的连续冷却曲线上开始出现河弯状,设计了增廉价元素Mn、Al,减贵重元素Mo、Ni的成分系,经过钢和链的试生产,获得了降低链制品成本,提高其强韧性的效果。The object of the present invention is to provide a kind of mooring chain steel, on the basis of improving the cost performance of R3, R4, R4S grade mooring steel, utilize Mn to affect the bay effect of the continuous cooling curve of structural steel, that is, the law of influence is similar to Mo, When the alloy Mn content increases to a certain amount, the continuous cooling curve of the steel begins to appear a river bend. The composition system of increasing the cheap elements Mn and Al and reducing the precious elements Mo and Ni is designed. After the trial production of steel and chain, The effect of reducing the cost of chain products and improving their strength and toughness is obtained.
为达到上述发明的目的,本发明提供了一种系泊链钢,其组份含量按照质量百分比为,C 0.18~0.32,Mn 1.95~2.60,Si 0.15~0.50,Cr 0.45~1.20,Mo 0.008~0.250,Ni 0.02~1.20,Cu≤0.40,S≤0.005,Al 0.005~0.250,(V+Ti+Nb)≤0.35,(Sn+As+Sb)≤0.06,N 0.004~0.024,O≤0.002,H≤0.00015,余量为Fe和不可避免杂质。In order to achieve the purpose of the above invention, the present invention provides a mooring chain steel, the composition content of which is C 0.18~0.32, Mn 1.95~2.60, Si 0.15~0.50, Cr 0.45~1.20, Mo 0.008~ 0.250, Ni 0.02~1.20, Cu≤0.40, S≤0.005, Al 0.005~0.250, (V+Ti+Nb)≤0.35, (Sn+As+Sb)≤0.06, N 0.004~0.024, O≤0.002, H ≤0.00015, the balance is Fe and unavoidable impurities.
以下是本发明主要合金元素的作用及其说明:The following are the effects and explanations of the main alloying elements of the present invention:
本发明的成分:Mn量高于现有技术。Al量或高于现有技术,Mo量低于现有技术,Cr、Ni低于或等于现有技术。The composition of the present invention: the amount of Mn is higher than that of the prior art. The amount of Al is higher than that of the prior art, the amount of Mo is lower than that of the prior art, and the amount of Cr and Ni is lower than or equal to the prior art.
C 0.18~0.32%C 0.18~0.32%
碳可以提高钢、链的强度和淬透性。碳含量低于0.18%,不易达到强度要求,不仅需要增加合金用量,而且因液-固相变过程中产生包晶反应而易导致裂纹;高于0.32%,不仅会提高钢、链的脆性转变温度,降低钢的塑性和韧性,而且会加速钢、链的腐蚀速率。另外碳是最强烈降低马氏体转变温度的元素,明显增加裂纹敏感性,也不允许以均匀成分和组织为目的的钢锭和连铸坯高温加热工艺,以免过烧。因此,须严格控制C含量。为了获得稳定的组织和性能,务必在成分设计中保持碳和合金元素含量的平衡。Carbon can increase the strength and hardenability of steel and chains. If the carbon content is lower than 0.18%, it is difficult to meet the strength requirements. Not only does it need to increase the amount of alloy, but also it is easy to cause cracks due to the peritectic reaction during the liquid-solid phase transition process; if it is higher than 0.32%, it will not only increase the brittle transition of steel and chains Temperature will reduce the plasticity and toughness of steel, and will accelerate the corrosion rate of steel and chain. In addition, carbon is the element that most strongly reduces the martensitic transformation temperature, which significantly increases crack sensitivity, and does not allow the high-temperature heating process of steel ingots and continuous casting slabs for the purpose of uniform composition and structure, so as to avoid overburning. Therefore, the C content must be strictly controlled. In order to obtain stable structure and performance, it is necessary to maintain the balance of carbon and alloying element content in the composition design.
Mn 1.95~2.60%Mn 1.95~2.60%
在链钢中,锰曾经是作为提高淬透性、强度和韧性而加入的主要合金元素。不过其含量未曾超过1.90%。而在大直径链环淬火的场合,一度出现了降锰升铬添加钼提高贝氏体淬透性的技术。本发明则发现和利用了锰也能提高贝氏体 淬透性的特点和改善闪光对焊工艺性能的技术,升锰降镍、钼、铬。提高了钢和链的性价比。锰低于1.95%,达不到上述效果;高于2.60%则产生成分偏析不易减轻或消除,从而影响组织和机械性能、工艺性能的均匀性和其他附加性能,例如氢脆敏感性。尤其应予指出的是钢、链含锰1.95%以上,组织中马氏体的含量不增反减。由于软、硬相的合理搭配,淬火-高温回火钢的屈强比可控;具有复合贝氏体(BU+BL+M)组织的钢、链的横截面的边缘和中心,母材与焊缝的强度差大幅度减小。对焊缝机械性能的考核也成为可能。总之,与现有的降锰升铬添加钼技术比较,提高的锰量与其他元素配合的本发明钢,也能提高和稳定从奥氏体化温度冷却过程中奥氏体的相变温度,增加贝氏体/马氏体淬火组织基体中贝氏体的体积分数,扩大稳定形成贝氏体相的冷却速度范围,克服超高强度钢裂纹敏感性高,热处理敏感性高,尤其是大直径链连续热处理的生产性差的难题,并为满足发明钢回火后的可控低屈强比创造了条件。尤其是碳化物形成元素铬的降低,M3C型碳化物FeCr3C减少,有利于减轻微电池效应,改善腐蚀性能。In chain steels, manganese was once the main alloying element added to improve hardenability, strength and toughness. However, its content has never exceeded 1.90%. In the case of large-diameter chain ring quenching, the technology of reducing manganese, increasing chromium and adding molybdenum to improve the hardenability of bainite once appeared. The present invention then discovers and utilizes manganese to also be able to improve bainite The characteristics of hardenability and the technology to improve the performance of flash butt welding process, increasing manganese and reducing nickel, molybdenum and chromium. Improved cost performance of steel and chains. If manganese is lower than 1.95%, the above effects cannot be achieved; if it is higher than 2.60%, the segregation of components will not be easily reduced or eliminated, thus affecting the structure and mechanical properties, the uniformity of process performance and other additional properties, such as hydrogen embrittlement susceptibility. In particular, it should be pointed out that steel and chains contain more than 1.95% manganese, and the content of martensite in the structure does not increase but decreases. Due to the reasonable combination of soft and hard phases, the yield ratio of quenched-high temperature tempered steel is controllable; the steel with composite bainite (BU+BL+M) structure, the edge and center of the cross-section of the chain, the base metal and The strength difference of the weld seam is greatly reduced. It is also possible to evaluate the mechanical properties of the weld. In a word, compared with the existing technology of reducing manganese, increasing chromium and adding molybdenum, the steel of the present invention in which the increased amount of manganese is combined with other elements can also increase and stabilize the phase transformation temperature of austenite during cooling from the austenitizing temperature, Increase the volume fraction of bainite in the matrix of the bainite/martensite quenching structure, expand the cooling rate range for the stable formation of bainite phase, and overcome the high crack sensitivity and heat treatment sensitivity of ultra-high-strength steel, especially for large diameter The difficult problem of poor productivity of chain continuous heat treatment has created conditions for satisfying the controllable low yield ratio of the invented steel after tempering. In particular, the reduction of the carbide-forming element chromium and the reduction of the M3C type carbide FeCr3C are beneficial to reduce the micro-battery effect and improve the corrosion performance.
Si 0.15~0.50%Si 0.15~0.50%
硅可提高钢的强度及淬透性,与锰也同样有脱氧效果,而且提高海水中钢、链的腐蚀性能。本发明控制其残余含量为0.15%及以上。但是硅含量过高,将影响韧性。因此设定其上限为0.50%。Silicon can improve the strength and hardenability of steel, and has the same deoxidation effect as manganese, and can improve the corrosion performance of steel and chains in seawater. The present invention controls its residual content to be 0.15% or above. However, if the silicon content is too high, the toughness will be affected. Therefore, its upper limit is set at 0.50%.
Cr 0.45~1.20%Cr 0.45~1.20%
铬也是提高链钢强度及淬透性,增加回火稳定性和海水中耐蚀性的主要元素。铬含量不应低于0.45%。由于本发明钢已经有多量锰的加入,考虑成本和效果,其上限定为1.20%。Chromium is also the main element to improve the strength and hardenability of chain steel, increase tempering stability and corrosion resistance in seawater. The chromium content should not be lower than 0.45%. Since a large amount of manganese has been added to the steel of the present invention, considering the cost and effect, the upper limit is 1.20%.
Ni 0.02~1.20%Ni 0.02~1.20%
根据船规,四级以上链钢的镍含量不得小于0.20%。镍在闪光焊接时不易烧损,有利于提高焊缝的均匀性。但含量过高增加成本。而且由于提高链的腐蚀电位,容易受阴极过保护而影响应力腐蚀(SCC)敏感性。本发明钢规定添加量不超过1.20%。镍的碳当量(Ceq)系数较低,必要时可以用于平衡Ceq,不使Ceq过高。镍提高淬透性,又保证链环,包括焊口部分良好的应变滑移能力,降低脆性转变温度,有利于改善链环焊口的低温韧性。其固溶强化作用较弱。 According to ship regulations, the nickel content of chain steel above grade 4 shall not be less than 0.20%. Nickel is not easy to burn out during flash welding, which is beneficial to improve the uniformity of the weld. But the content is too high to increase the cost. Moreover, due to the increase of the corrosion potential of the chain, it is easy to be affected by cathodic overprotection and affect the sensitivity of stress corrosion (SCC). The steel of the present invention stipulates that the addition amount shall not exceed 1.20%. The carbon equivalent (Ceq) coefficient of nickel is low, and it can be used to balance Ceq if necessary, so as not to make Ceq too high. Nickel improves the hardenability, and ensures good strain-slip ability of the link, including the weld joint, and reduces the brittle transition temperature, which is beneficial to improve the low-temperature toughness of the link weld. Its solid solution strengthening effect is weak.
Mo 0.008~0.250%Mo 0.008~0.250%
钼推迟钢的铁素体-珠光体转变,防止回火脆性,显著提高钢的冲击韧性,钼也提高钢的耐蚀性,并且是闪光焊接时不易烧损的元素。钼,钼与铬,特别是与锰组合可以稳定贝氏体含量,控制贝氏体/马氏体比例,提高相变温度,降低裂纹敏感性,有利于链环横截面上性能的稳定和屈强比的控制。由于钼归类于贵重元素,增加钢材成本。与传统链钢含钼≥0.45%,直径≥160mm时,含钼0.5%以上性能才能稳定的技术相比,本发明以锰代钼,减少了钼的一半以上用量。
(V+Ti+Nb)≤0.35%
Molybdenum delays the ferrite-pearlite transformation of steel, prevents temper brittleness, and significantly improves the impact toughness of steel. Molybdenum also improves the corrosion resistance of steel, and is an element that is not easily burned during flash welding. Molybdenum, molybdenum and chromium, especially the combination with manganese can stabilize the bainite content, control the bainite/martensite ratio, increase the phase transition temperature, reduce the crack sensitivity, and benefit the stability and buckling of the cross-section of the link. Stronger control. Since molybdenum is classified as a precious element, it increases the cost of steel. Compared with the technology that the traditional chain steel contains molybdenum ≥ 0.45%, and the diameter ≥ 160mm, the performance can only be stable if the molybdenum content is more than 0.5%, the present invention substitutes manganese for molybdenum, reducing the amount of molybdenum by more than half.
(V+Ti+Nb)≤0.35%
微合金元素钒V,钛Ti,铌Nb的作用有强化、细化和氢陷阱作用等方面,也是近10年来海工链钢中的常用元素。由于原材料和炉衬等因素,钛是不可避免的。在本发明中钒作为强化元素,形成1~4nm的极限细小的VCN。这些VCN不仅是高能量的强氢陷阱,起限制扩散性氢脆化钢的作用,而且提高微区屈服强度,减少微区应变(微屈服)导致的氢局部聚集,从另一方面降低HE敏感性。就本发明而言,钢、链的最高抗拉强度并未达到R6级的1250MPa,与其说加钒是必要的,不如说加钒是充分的,补充的。即加钒起到扩大工艺窗口的作用。可以综合考虑成本、设备、操作等推荐决定添加与否。铌作为细化元素,可以补充铝(AlN)、钛(TiN)细化作用的不足。考虑成本因素,规定三者之和不超过0.35%。
Cu≤0.40%,
Microalloying elements vanadium V, titanium Ti, and niobium Nb have the effects of strengthening, refining, and hydrogen trapping, and they are also commonly used elements in marine chain steel in the past 10 years. Due to factors such as raw materials and furnace lining, titanium is unavoidable. In the present invention, vanadium is used as a strengthening element to form extremely fine VCN of 1 to 4 nm. These VCNs are not only high-energy strong hydrogen traps, which can limit the diffusion of hydrogen embrittlement steel, but also increase the micro-zone yield strength, reduce the local hydrogen accumulation caused by micro-zone strain (micro-yield), and reduce the HE sensitivity on the other hand. sex. As far as the present invention is concerned, the highest tensile strength of the steel and the chain has not reached 1250MPa of the R6 grade, so the addition of vanadium is not so much necessary as it is sufficient and supplementary. That is, the addition of vanadium plays the role of expanding the process window. It is recommended to decide whether to add or not by comprehensively considering cost, equipment, operation, etc. As a refinement element, niobium can supplement the deficiency of aluminum (AlN) and titanium (TiN) refinement. Considering the cost factor, it is stipulated that the sum of the three shall not exceed 0.35%.
Cu≤0.40%,
铜在低含量时,其作用和镍相似,可以提高钢的强韧性,并且在低锡含量和加镍的钢中,少量铜不会诱发表面热脆裂纹,却可以提高钢的大气耐候性,有利于链厂存储和计划安排。铜或也有利于链环在浪花飞溅区的耐腐蚀性。不过这一使用场合的数据还不多,需要积累。铜Ceq系数较低,价格比镍便宜,可以适当利用。不过含量过高,可能降低链环表面氧化膜的致密性。When the content of copper is low, its effect is similar to that of nickel, which can improve the strength and toughness of steel, and in steel with low tin content and nickel addition, a small amount of copper will not induce hot brittle cracks on the surface, but it can improve the atmospheric weather resistance of steel. Conducive to chain factory storage and planning arrangements. Copper or also contributes to the corrosion resistance of the link in the splash zone. However, there is not much data for this use case and needs to be accumulated. Copper has a low Ceq coefficient and is cheaper than nickel, so it can be properly utilized. However, if the content is too high, the compactness of the oxide film on the surface of the link may be reduced.
Al 0.005~0.250%;Al 0.005~0.250%;
铝是主要脱氧元素,而且能够形成AlN,细化晶粒,微量铝改善链条母材及焊缝处的综合力学性能,铝超过0.2%时也能够提高钢的耐蚀性能。合金结构钢以铌细化晶粒时,铝的作用可以仅是脱氧,允许出钢吊包时的残余铝不小于0.005%。本发明的实施显示了铝的耐海水腐蚀倾向,并且限制其≤0.250%,控 制其对相变的影响。应用较高铝的前提是闪光对焊工艺到位,限制焊口氧化物夹杂的尺寸和数量不超过正常水平。Aluminum is the main deoxidizing element, and it can form AlN, refine grains, and a small amount of aluminum can improve the comprehensive mechanical properties of the chain base material and weld. When aluminum exceeds 0.2%, it can also improve the corrosion resistance of steel. When niobium is used to refine the grains of alloy structural steel, the role of aluminum can only be deoxidation, and the residual aluminum is allowed to be not less than 0.005% when the steel is lifted. The implementation of the present invention shows the corrosion resistance tendency of aluminum in seawater, and limits it to ≤0.250%, and controls restrain its influence on the phase transition. The premise of applying higher aluminum is that the flash butt welding process is in place, and the size and quantity of oxide inclusions in the weld joint are limited to not exceed the normal level.
N 0.004~0.024%;N 0.004~0.024%;
钢中氮是不可避免的,而固定成AlN、TiN、VN、NbN,可以防止应变时效,细化晶粒和/或提高强度。冶炼工程师以降低结构钢的氧、氢、氮目标。而发明人通过实际的应用感受到以固态相变核心形式存在的化合物中的氧,作为轻元素的氮,它们的潜力有待发挥。氮的利用过程中既要防止自由氮或固溶氮过多,在钢液凝固过程中形成气孔,又要防止微合金氮化物析出增加裂纹敏感性。本发明允许产品钢、链的实际氮量为0.004~0.024wt%。需要注意的是形成所需尺度范围的化合物中的有效氮与微合金元素的结合遵循化学当量规律。偏离此规律的“控制氮与微合金元素技术”达不到应有效果。
H≤0.00015%
Nitrogen in steel is unavoidable, and fixed into AlN, TiN, VN, NbN can prevent strain aging, refine grains and/or increase strength. Smelting engineers to reduce the oxygen, hydrogen and nitrogen targets of structural steel. However, the inventors feel that the potential of oxygen in the compound existing as a solid phase transition core and nitrogen as a light element has yet to be brought into play through practical applications. In the process of nitrogen utilization, it is necessary to prevent excessive free nitrogen or solid solution nitrogen from forming pores during the solidification of molten steel, and to prevent the precipitation of microalloy nitrides from increasing crack sensitivity. The invention allows the actual nitrogen content of product steel and chain to be 0.004-0.024wt%. It should be noted that the combination of available nitrogen and microalloying elements in compounds forming the required scale range follows the stoichiometric law. The “technology of controlling nitrogen and microalloying elements” that deviates from this law cannot achieve the desired effect.
H≤0.00015%
为了防止内在氢引起钢材缺陷,规定经过炉外精炼-真空脱气后等待出钢的钢水的氢量≤0.00015%。
O≤0.0020%
In order to prevent internal hydrogen from causing steel defects, it is stipulated that the hydrogen content of molten steel waiting to be tapped after refining outside the furnace-vacuum degassing is ≤0.00015%.
O≤0.0020%
为降低氧化物夹杂级别和总量,规定了氧的上限。
(Sn+As+Sb)≤0.06%,
In order to reduce the level and total amount of oxide inclusions, an upper limit of oxygen is specified.
(Sn+As+Sb)≤0.06%,
与硫、磷相似,锑、砷、锡等Tramp元素也脆化原奥氏体晶界,降低韧性,含量多时还可能引起热加工裂纹。虽然希望越低越好,考虑到工业产品的成本,其总量允许不超过0.06%。Similar to sulfur and phosphorus, Tramp elements such as antimony, arsenic, and tin also embrittle the grain boundaries of prior austenite, reduce toughness, and may cause hot working cracks when the content is large. Although it is hoped that the lower the better, considering the cost of industrial products, the total amount is allowed to be no more than 0.06%.
本发明的第二个目的在于提供一种上述的系泊链钢的生产方法,包括如下步骤,The second object of the present invention is to provide a kind of production method of above-mentioned mooring chain steel, comprising the following steps,
S1、其出钢成分质量百分比为,C 0.18~0.32,Mn 1.95~2.60,Si 0.15~0.50,Cr0.45~1.20,Mo 0.008~0.250,Ni 0.02~1.20,Cu≤0.40,S≤0.005,Al 0.005~0.250,(V+Ti+Nb)≤0.35,(Sn+As+Sb)≤0.06,N 0.004~0.024,O≤0.002,H≤0.00015,余量为Fe和不可避免杂质;S1, the mass percentage of the tapping composition is: C 0.18~0.32, Mn 1.95~2.60, Si 0.15~0.50, Cr0.45~1.20, Mo 0.008~0.250, Ni 0.02~1.20, Cu≤0.40, S≤0.005, Al 0.005~0.250, (V+Ti+Nb)≤0.35, (Sn+As+Sb)≤0.06, N 0.004~0.024, O≤0.002, H≤0.00015, the balance is Fe and unavoidable impurities;
S2、按照上述出钢目标成分配比,采用电炉或转炉初炼,而后经炉外精炼或真空脱气后浇注成钢锭或连铸坯;S2. According to the above-mentioned target composition ratio of tapping, use electric furnace or converter for initial refining, and then pour into steel ingot or continuous casting slab after refining outside the furnace or vacuum degassing;
S3、将所述钢锭加热至1150~1300℃后,进行锻造或轧制成圆钢。S3. After heating the steel ingot to 1150-1300°C, forging or rolling it into round steel.
具体地,在步骤S1中,采用电炉或转炉初炼过程中使用的金属原料为铁水、 生铁、废钢、铁合金、海绵铁、金属氧化物和矿石中的一种或任意两种以上的混合。Specifically, in step S1, the metal raw material used in the primary smelting process of an electric furnace or a converter is molten iron, One or a mixture of any two or more of pig iron, steel scrap, ferroalloy, sponge iron, metal oxide and ore.
具体地,在步骤S2中,所述钢锭的截面积与成品圆钢的截面积之比≥7。Specifically, in step S2, the ratio of the cross-sectional area of the steel ingot to the cross-sectional area of the finished round steel is ≥7.
具体地,在步骤S3之后,还包括步骤S4、将所述圆钢进行矫直和砂轮磨剥或车削后,按照船级社规范探伤、取样和测试。Specifically, after step S3, step S4 is also included, after the round steel is straightened and grinded or turned by a grinding wheel, flaw detection, sampling and testing are carried out according to classification society specifications.
本发明的第三个目的在于一种系泊链,采用上述的系泊链钢制成的圆钢制备而成。The third object of the present invention is a mooring chain, which is prepared by using the round steel made of the mooring chain steel mentioned above.
所述系泊链整体热处理后在三分之一半径处基体的性能和基体与焊缝的冲击功,其最小值为,
After the overall heat treatment of the mooring chain, the performance of the matrix at one-third of the radius and the impact energy of the matrix and the weld, the minimum value is,
其中,ABS,美国船级社;DNVGL,挪威船级社;Rm,抗拉强度;Rp0.2,条件屈服强度;YR,屈强比;Aim value,目标值;A,延伸率;Z,断面收缩率;CVN,夏比V型缺口冲击功;B,环背;W,焊口。关于YR,本专利选择更高要求的ABS目标值。Among them, ABS, American Bureau of Shipping; DNVGL, Det Norske Veritas; Rm, tensile strength; Rp0.2, conditional yield strength; YR, yield ratio; Aim value, target value; A, elongation; Z, section Shrinkage; CVN, Charpy V-notch impact energy; B, ring back; W, weld. Regarding YR, this patent selects a more demanding ABS target value.
本发明的第四个目的在于提供一种上述的系泊链的生产方法,所述系泊链采用前文所述的系泊链钢依次经下料、加热950~850℃、弯环900~800℃、测温、闪光对焊,最后编链而成;其中,编成的链条在间歇式或立式连续式调质炉中进行热处理,其附件在间歇式调质炉中进行热处理。热处理步骤是:首先进行至少一次淬火处理,每次淬火温度>890℃,水冷,水温小于50℃;淬火处理后再进行回火处理,回火温度为570~650℃,水冷或空冷。The fourth object of the present invention is to provide a production method of the above-mentioned mooring chain. The mooring chain adopts the above-mentioned mooring chain steel, which is sequentially cut, heated at 950-850°C, and bent at 900-800°C. ℃, temperature measurement, flash butt welding, and finally weaving chains; among them, the braided chains are heat treated in batch or vertical continuous tempering furnaces, and their accessories are heat treated in batch tempering furnaces. The heat treatment steps are: firstly carry out at least one quenching treatment, each time the quenching temperature is >890°C, water cooling, the water temperature is less than 50°C; after the quenching treatment, tempering treatment is carried out, the tempering temperature is 570-650°C, water cooling or air cooling.
具体地,编成的链条及其附件在间歇式或立式连续式调质炉中进行两次淬火处理。Specifically, the braided chain and its accessories are quenched twice in a batch or vertical continuous tempering furnace.
本发明,与现有技术相比具有以下优点:The present invention has the following advantages compared with the prior art:
(1)首次生产涵盖市场所需的直径范围,提高了性能,降低了成本;(1) The first production covers the diameter range required by the market, which improves performance and reduces costs;
(2)本发明钢首次应用于闪光对焊工件,获得稳定强韧焊缝。原因之一是, 与C0.22MnCrNiMo钢比较,增Mn减Mo、Cr、Ni降低链环闪光对焊时的热变形阻力6~16%,容易形成结合良好的密合焊缝,焊缝韧性降低率大幅减小。原因之二是较传统钢的最终密接顶锻温度范围增加了工艺窗口,减少了保证焊缝密接稳定性的难度,稳定了焊接质量;本发明的R4钢允许的最终密接顶锻温度约750~850℃;而传统R4钢允许的最终密接顶锻温度约800~850℃;(2) The steel of the present invention is applied to flash butt welding workpieces for the first time to obtain stable and tough welds. One of the reasons is that, Compared with C0.22MnCrNiMo steel, increasing Mn and reducing Mo, Cr, and Ni reduces the thermal deformation resistance of link flash butt welding by 6-16%, and it is easy to form a well-bonded tight weld, and the decrease rate of weld toughness is greatly reduced. The second reason is that the final close upsetting temperature range of traditional steel increases the process window, reduces the difficulty of ensuring the stability of the weld joint, and stabilizes the welding quality; the allowable final close upsetting temperature of the R4 steel of the present invention is about 750 ~ 850°C; while the final close upsetting temperature allowed by traditional R4 steel is about 800-850°C;
(3)实现一钢多用的简约管理:由于成分系的调整,减少了贵重合金元素的用量,因此可以实现一钢多用的简约管理。由于R3S、R4、R4S、R5级(R6级也是)钢具有相同的船级社成分和工艺规范,因此允许例如以R4级圆钢产品的成本生产R4级和R4S级钢和链;以R3S级圆钢产品的成本生产R3S级和R4级钢和链。而这一过程在技术上只要变化回火参数就可以实现。例如各个级别的标准抗拉强度差别,R4S与R4,960-860=100MPa,R4与R3S相差860-770=90MPa,高温回火温度±30℃波动范围内调整回火参数即可解决问题;便于大批量生产管理,降低制造成本,提高效率,实现链钢生产和链环制造的管理革命;(3) Realize the simple management of one steel with multiple uses: Due to the adjustment of the composition system, the amount of precious alloy elements is reduced, so the simple management of one steel with multiple uses can be realized. Since steel grades R3S, R4, R4S, R5 (also grade R6) have the same classification society composition and process specifications, it is allowed, for example, to produce grades R4 and R4S steel and chains at the cost of grade R4 round bar products; The cost of round bar products produces R3S and R4 grade steel and chain. And this process can be realized technically as long as the tempering parameters are changed. For example, the standard tensile strength difference of each level, R4S and R4, 960-860 = 100MPa, R4 and R3S difference 860-770 = 90MPa, the problem can be solved by adjusting the tempering parameters within the fluctuation range of the high temperature tempering temperature ± 30°C; Mass production management, reducing manufacturing costs, improving efficiency, and realizing the management revolution of chain steel production and chain ring manufacturing;
(4)消除了锭、坯表面的第3类裂纹:Nb、Al微合金化的低碳合金钢锭、坯的表面裂纹是废品的主要原因。由于增加了贝氏体淬透性,大截面锭坯不发生铁素体和珠光及相变。本发明的R3、R4、R4S(R5)钢不易发生因晶界析出铁素体而降低热塑性,在连铸矫直或锭、坯热送进加热炉的工序中不易发生低应变速率应变条件下致裂应力(外加机械应力或热应力)导致的裂纹,消除了业内周知的低碳钢锭、坯表面的第3类裂纹,提高了产品的成坯率和生产效率,降低了成本;(4) Eliminate the third type of cracks on the surface of ingots and billets: the surface cracks of low-carbon alloy steel ingots and billets with Nb and Al microalloying are the main cause of waste products. Due to the increased bainite hardenability, the large cross-section ingot does not undergo ferrite, pearlite and phase transformation. The R3, R4, R4S (R5) steels of the present invention are less likely to reduce thermoplasticity due to the precipitation of ferrite at the grain boundaries, and are less prone to low strain rate strain conditions in the process of continuous casting straightening or ingots and billets being heated into the heating furnace. Cracks caused by cracking stress (external mechanical stress or thermal stress) eliminate the third type of cracks on the surface of low-carbon steel ingots and billets known in the industry, improve the billet rate and production efficiency of products, and reduce costs;
(5)淬火在贝氏体区域相变的本发明横截面性能比较均匀;本发明有NbCN,AlN、TiN单独或组合的多种阻止奥氏体晶粒长大的方法可供选择,提高综合性能和降低EAC敏感性;(5) Quenching is relatively uniform in the cross-sectional performance of the present invention in the phase transformation of the bainite region; the present invention has NbCN, AlN, TiN alone or a combination of multiple methods to prevent the growth of austenite grains to choose from, improving the comprehensive performance and reduced EAC sensitivity;
(6)降低热塑性变形阻力,对大截面的闪光对焊非常有利;(6) Reduce thermoplastic deformation resistance, which is very beneficial to flash butt welding of large sections;
(7)具有可靠的环境性能。(7) It has reliable environmental performance.
具体实施方式Detailed ways
以下结合具体实施例,对本发明做进一步说明。The present invention will be further described below in conjunction with specific embodiments.
本发明实施例1至实施例8和对比例1至对比例6的成分见表1:The composition of embodiment 1 to embodiment 8 of the present invention and comparative example 1 to comparative example 6 is shown in table 1:
表1:本发明的实施例和对比例的炼钢成分,wt%
Table 1: Steelmaking composition of the embodiment of the present invention and comparative example, wt%
实施例1~8中的系泊链钢的生产方法如下:The production method of the mooring chain steel in embodiment 1~8 is as follows:
S1、其出钢成分质量百分比为,C 0.18~0.32,Mn 1.95~2.60,Si 0.15~0.50,Cr0.45~1.20,Mo 0.008~0.250,Ni 0.02~1.20,Cu≤0.40,S≤0.005,Al 0.005~0.250,(V+Ti+Nb)≤0.35,(Sn+As+Sb)≤0.06,N 0.004~0.024,O≤0.002,H≤0.00015,余量为Fe和不可避免杂质;电炉,初炼过程中使用的金属原料为铁水、生铁、废钢、铁合金、矿石等。S1, the mass percentage of the tapping composition is: C 0.18~0.32, Mn 1.95~2.60, Si 0.15~0.50, Cr0.45~1.20, Mo 0.008~0.250, Ni 0.02~1.20, Cu≤0.40, S≤0.005, Al 0.005~0.250, (V+Ti+Nb)≤0.35, (Sn+As+Sb)≤0.06, N 0.004~0.024, O≤0.002, H≤0.00015, the balance is Fe and unavoidable impurities; electric furnace, primary refining The metal raw materials used in the process are molten iron, pig iron, scrap steel, ferroalloy, ore, etc.
S2、按照上述出钢目标成分配比,采用电炉初炼,而后经炉外精炼,真空脱气后浇注成钢锭,其中实施例8不脱气;所述钢锭的截面积与成品圆钢的截面积之比≥7;S2, according to the above-mentioned tapping target composition ratio, adopt electric furnace for initial refining, then through refining outside the furnace, pour into steel ingot after vacuum degassing, wherein embodiment 8 does not degas; Area ratio ≥ 7;
S3、将所述钢锭加热至1150~1300℃后,进行锻造成圆钢;S3. After heating the steel ingot to 1150-1300°C, forging it into round steel;
S4、将所述圆钢进行矫直和砂轮磨剥后,进行探伤、取样和测试。S4. After the round steel is straightened and stripped by grinding wheels, flaw detection, sampling and testing are carried out.
实施例1~实施例8的系泊链采用上述生产方法制备的圆钢依次经下料、加热950~900℃、弯环完成850~800℃、测温、闪光对焊、编链、车底炉加热和淬火水冷-回火水冷;其中链条在间歇式调质炉中进行热处理。热处理步骤是:加热920℃水冷淬火,水温小于50℃;再加热至610℃回火,水冷。The round steel prepared by the above-mentioned production method for the mooring chains of Examples 1 to 8 is sequentially cut, heated at 950-900°C, bent at 850-800°C, temperature measured, flash-butt welded, chain-braided, and bottomed. Furnace heating and quenching water cooling - tempering water cooling; the chain is heat treated in a batch tempering furnace. The heat treatment steps are: heating to 920°C for water-cooling and quenching, and the water temperature is less than 50°C; reheating to 610°C for tempering, and water cooling.
现对实施例1~8和对比例1~6进行同等条件下的机械性能检测,检测结果如表2Embodiment 1~8 and comparative example 1~6 are now carried out the mechanical performance detection under the same conditions, and the detection results are shown in Table 2
表2
Table 2
由此可见,From this it can be seen that
(1)对比例的Mn量分别超出发明范围的上下限。虽然增加了元素Cr、Ni,机械性能(屈强比或抗拉强度)仍然不能稳定达标;(1) The amount of Mn in the comparative example exceeds the upper and lower limits of the scope of the invention, respectively. Although the elements Cr and Ni have been added, the mechanical properties (yield strength ratio or tensile strength) still cannot reach the standard stably;
(2)对比例3、4、5的成分几十年来一贯被使用。与实施例1~7比较,贵重合金元素Ni或/和Mo的含量分别增加约一倍,相应地成本也会增加;(2) The ingredients of Comparative Examples 3, 4, and 5 have been used consistently for decades. Compared with Examples 1-7, the content of the precious alloy element Ni or/and Mo is increased by about one time respectively, and the cost will increase accordingly;
(3)对比例1,2的Mn量分别超出发明范围的上下限。甚至增加了元素Cr、Ni,强度仍然不能稳定达标(R4)或屈强比往往超过0.92;对比例1、5的的屈强比YR超过美国船级社ABS目标;对比例2、3、4是R4级链,其抗 拉强度低于标准;对比例6是R3级链,其韧性不合格;(3) The amounts of Mn in Comparative Examples 1 and 2 respectively exceed the upper and lower limits of the scope of the invention. Even with the addition of elements Cr and Ni, the strength still cannot stably reach the standard (R4) or the yield ratio often exceeds 0.92; the yield ratio YR of comparative examples 1 and 5 exceeds the ABS target of the American Bureau of Shipping; comparative examples 2, 3, and 4 Is the R4 grade chain, its resistance The tensile strength is lower than the standard; comparative example 6 is an R3 grade chain, and its toughness is unqualified;
(4)与环背比较,焊缝韧性降低率=1-(焊缝冲击/环背冲击)=23~39%,仅是对比例42~73%的约一半。实施例机械性能稳定,塑性和韧性改善的现象显示,链环,尤其是大尺寸链环的制作中,排除焊渣的能力提升与实施例热变形阻力降低,焊缝密接性提高也有关联;(4) Compared with the ring back, the decrease rate of weld toughness=1-(weld seam impact/ring back impact)=23-39%, which is only about half of 42-73% of the comparative example. Stable mechanical properties and improved plasticity and toughness in the examples show that in the production of chain links, especially large-scale link links, the improvement of the ability to remove welding slag is related to the reduction of thermal deformation resistance and the improvement of weld adhesion in the examples;
(5)对比例3、4、5的成分几十年来一贯被使用。与实施例比较,贵重合金元素Mo、Ni的含量分别增加约一倍,相应地成本也会增加。对比例1、5的的屈强比YR超过美国船级社ABS标准。对比例2、3、4是R4级链,其抗拉强度低于标准。对比例6是R3级链,其韧性不合格。对比例的焊缝韧性降低率击42~73%,对比例的Mn量分别超出发明范围的上下限。甚至增加了元素Cr、Ni,机械性能(屈强比或抗拉强度或韧性)仍然不合格。(5) The ingredients of Comparative Examples 3, 4, and 5 have been used consistently for decades. Compared with the embodiment, the contents of the precious alloy elements Mo and Ni are increased by about one time respectively, and the cost will increase correspondingly. The yield strength ratio YR of Comparative Examples 1 and 5 exceeds the ABS standard of the American Bureau of Shipping. Comparative examples 2, 3, and 4 are R4 chains whose tensile strength is lower than the standard. Comparative example 6 is an R3 grade chain, and its toughness is unqualified. The weld seam toughness reduction rate of the comparative example is 42-73%, and the Mn content of the comparative example exceeds the upper and lower limits of the scope of the invention respectively. Even with the addition of elements Cr and Ni, the mechanical properties (yield ratio or tensile strength or toughness) are still unqualified.
表3为实施例5和7的海水中的腐蚀速率趋势和环境裂纹抗力性能表
Table 3 is the corrosion rate trend and environmental crack resistance performance table in the seawater of embodiment 5 and 7
可见钢材和链的内在氢均在极低水平;增加Al、Cu,腐蚀速率有降低趋势;深海缺氧环境腐蚀速率降低一个数量级;提供了环境裂纹敏感性的数据。It can be seen that the internal hydrogen of the steel and the chain is at a very low level; the corrosion rate tends to decrease with the increase of Al and Cu; the corrosion rate in the deep-sea anoxic environment decreases by an order of magnitude; the data of environmental crack sensitivity is provided.
表4为实施例和对比例横截面的r/3与心部的硬度(wt%)
Table 4 is the hardness (wt %) of r/3 of embodiment and comparative example cross-section and core portion
以上已对本发明创造的较佳实施例进行了具体说明,但本发明创造并不限于所述实施例,熟悉本领域的技术人员在不违背本发明创造精神的前提下还可做出种种的等同的变型或替换,这些等同的变型或替换均包含在本申请权利要求所限定的范围。 The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the described embodiments, and those skilled in the art can also make various equivalents without violating the spirit of the present invention. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims (12)

  1. 一种系泊链钢,其特征在于,其组分含量按照质量百分比为,C 0.18~0.32,Mn 1.95~2.60,Si 0.15~0.50,Cr 0.45~1.20,Mo 0.008~0.250,Ni 0.02~1.20,Cu≤0.40,S≤0.005,Al 0.005~0.250,(V+Ti+Nb)≤0.35,(Sn+As+Sb)≤0.06,N 0.004~0.024,O≤0.002,H≤0.00015,余量为Fe和不可避免杂质。A kind of mooring chain steel, characterized in that, its component content according to the mass percentage is, C 0.18~0.32, Mn 1.95~2.60, Si 0.15~0.50, Cr 0.45~1.20, Mo 0.008~0.250, Ni 0.02~1.20, Cu≤0.40, S≤0.005, Al 0.005~0.250, (V+Ti+Nb)≤0.35, (Sn+As+Sb)≤0.06, N 0.004~0.024, O≤0.002, H≤0.00015, the balance is Fe and unavoidable impurities.
  2. 根据权利要求1所述的系泊链钢,其特征在于,其组分含量按照质量百分比为,C 0.18~0.32,Mn 1.95~2.60,Si 0.15~0.50,Cr 0.45~1.20,Mo 0.008~0.250,Ni 0.02~1.20,Cu≤0.40,S≤0.005,P≤0.015,Al 0.005~0.250,(V+Ti+Nb)≤0.35,(Sn+As+Sb)≤0.06,N 0.004~0.024,O≤0.002,H≤0.00015,余量为Fe和不可避免杂质。The mooring chain steel according to claim 1, characterized in that its component content is, in terms of mass percentage, C 0.18-0.32, Mn 1.95-2.60, Si 0.15-0.50, Cr 0.45-1.20, Mo 0.008-0.250, Ni 0.02~1.20, Cu≤0.40, S≤0.005, P≤0.015, Al 0.005~0.250, (V+Ti+Nb)≤0.35, (Sn+As+Sb)≤0.06, N 0.004~0.024, O≤0.002 , H≤0.00015, the balance is Fe and unavoidable impurities.
  3. 一种根据权利要求1所述的系泊链钢的生产方法,其特征在于,包括如下步骤,A method for producing mooring chain steel according to claim 1, characterized in that it comprises the steps of,
    S1、其出钢目标成分质量百分比为,C 0.18~0.32,Mn 1.95~2.60,Si 0.15~0.50,Cr0.45~1.20,Mo 0.008~0.250,Ni 0.02~1.20,Cu≤0.40,S≤0.005,Al 0.005~0.250,(V+Ti+Nb)≤0.35,(Sn+As+Sb)≤0.06,N 0.004~0.024,O≤0.002,H≤0.00015,余量为Fe和不可避免杂质;S1, the mass percentage of the steel target composition is: C 0.18~0.32, Mn 1.95~2.60, Si 0.15~0.50, Cr0.45~1.20, Mo 0.008~0.250, Ni 0.02~1.20, Cu≤0.40, S≤0.005, Al 0.005~0.250, (V+Ti+Nb)≤0.35, (Sn+As+Sb)≤0.06, N 0.004~0.024, O≤0.002, H≤0.00015, the balance is Fe and unavoidable impurities;
    S2、按照上述出钢目标成分配比,采用电炉或转炉初炼,而后经炉外精炼,和/或真空脱气后浇注成钢锭或连铸坯;S2. According to the above-mentioned target composition ratio for tapping, use electric furnace or converter for primary refining, then refine outside the furnace, and/or vacuum degas and then cast into steel ingots or continuous casting slabs;
    S3、将所述钢锭或连铸坯加热至1150~1300℃后,进行锻造或轧制成圆钢。S3. After heating the steel ingot or continuous casting slab to 1150-1300° C., forging or rolling it into round steel.
  4. 根据权利要求3所述的系泊链钢的生产方法,其特征在于,在步骤S1中,采用电炉或转炉初炼过程中使用的金属原料为铁水、生铁、废钢、铁合金、海绵铁、金属氧化物和矿石中的一种或任意两种以上的混合。The production method of mooring chain steel according to claim 3 is characterized in that, in step S1, the metal raw materials used in the primary smelting process of electric furnace or converter are molten iron, pig iron, scrap steel, ferroalloy, sponge iron, metal oxide One or a mixture of any two or more of minerals and ores.
  5. 根据权利要求3所述的系泊链钢的生产方法,其特征在于,在步骤S2中,所述钢锭或连铸坯的截面积与成品圆钢的截面积之比≥7。The production method of mooring chain steel according to claim 3, characterized in that, in step S2, the ratio of the cross-sectional area of the steel ingot or continuous casting slab to the cross-sectional area of the finished round steel is ≥7.
  6. 根据权利要求3所述的系泊链钢的生产方法,其特征在于,在步骤S3之后,还包括步骤S4、将所述圆钢进行矫直和砂轮磨剥或车削后,进行探伤、取样和测试。The production method of mooring chain steel according to claim 3, is characterized in that, after step S3, also includes step S4, after said round steel is carried out straightening and grinding wheel grinding stripping or turning, carry out flaw detection, sampling and test.
  7. 根据权利要求3所述的系泊链钢的生产方法,其特征在于,包括如下步骤, The production method of mooring chain steel according to claim 3, is characterized in that, comprises the following steps,
    S1、其出钢目标成分质量百分比为,C 0.18~0.32,Mn 1.95~2.60,Si 0.15~0.50,Cr0.45~1.20,Mo 0.008~0.250,Ni 0.02~1.20,Cu≤0.40,S≤0.005,P≤0.015,Al 0.005~0.250,(V+Ti+Nb)≤0.35,(Sn+As+Sb)≤0.06,N 0.004~0.024,O≤0.002,H≤0.00015,余量为Fe和不可避免杂质;S1, the mass percentage of the steel target composition is: C 0.18~0.32, Mn 1.95~2.60, Si 0.15~0.50, Cr0.45~1.20, Mo 0.008~0.250, Ni 0.02~1.20, Cu≤0.40, S≤0.005, P≤0.015, Al 0.005~0.250, (V+Ti+Nb)≤0.35, (Sn+As+Sb)≤0.06, N 0.004~0.024, O≤0.002, H≤0.00015, the balance is Fe and unavoidable impurities ;
    S2、按照上述出钢目标成分配比,采用电炉或转炉初炼,而后经炉外精炼,和/或真空脱气后浇注成钢锭或连铸坯;S2. According to the above-mentioned target composition ratio for tapping, use electric furnace or converter for primary refining, then refine outside the furnace, and/or vacuum degas and then cast into steel ingots or continuous casting slabs;
    S3、将所述钢锭或连铸坯加热至1150~1300℃后,进行锻造或轧制成圆钢。S3. After heating the steel ingot or continuous casting slab to 1150-1300° C., forging or rolling it into round steel.
  8. 一种系泊链,其特征在于,采用权利要求1所述的系泊链钢制成的圆钢制备而成。A mooring chain, characterized in that it is prepared from round steel made of the mooring chain steel according to claim 1.
  9. 根据权利要求8所述的一种系泊链,其特征在于,所述系泊链整体热处理后在三分之一半径处基体的性能和基体与焊缝的冲击功,其最小值为,
    A mooring chain according to claim 8, characterized in that, after the overall heat treatment of the mooring chain, the performance of the matrix at one-third of the radius and the impact energy between the matrix and the weld seam, the minimum value is,
    其中,ABS,美国船级社;DNVGL,挪威船级社;Rm,抗拉强度;Rp0.2,条件屈服强度;YR,屈强比;Aim value,目标值;A,延伸率;Z,断面收缩率;CVN,夏比V型缺口冲击功;B,环背;W,焊口。Among them, ABS, American Bureau of Shipping; DNVGL, Det Norske Veritas; Rm, tensile strength; Rp0.2, conditional yield strength; YR, yield ratio; Aim value, target value; A, elongation; Z, section Shrinkage; CVN, Charpy V-notch impact energy; B, ring back; W, weld.
  10. 一种权利要求8所述的系泊链的生产方法,其特征在于,所述系泊链采用权利要求1所述的系泊链钢制成的圆钢依次经下料、加热950~900℃、弯环、测温、闪光对焊、编链、加热、淬火、水冷、回火、水冷或空冷;其中,编成的链条在间歇式或立式连续式调质炉中进行热处理;其附件在间歇式调质炉中进行热处理。A production method for a mooring chain according to claim 8, characterized in that the round steel made of the mooring chain steel according to claim 1 is used for the mooring chain and is sequentially cut and heated at 950-900°C , bending ring, temperature measurement, flash butt welding, chain knitting, heating, quenching, water cooling, tempering, water cooling or air cooling; wherein, the braided chain is heat treated in a batch or vertical continuous tempering furnace; its accessories Heat treatment is carried out in a batch tempering furnace.
  11. 根据权利要求10所述的生产方法,其特征在于,所述弯环的温度为850~800℃。The production method according to claim 10, characterized in that the temperature of the bent ring is 850-800°C.
  12. 根据权利要求10所述的系泊链的生产方法,其特征在于,热处理步骤是:首先进行至少一次淬火处理,每次淬火温度>890℃,水冷,水温小于50℃;淬火处理后再进行回火处理,回火温度为570~650℃,水冷或空冷。 The production method of mooring chains according to claim 10, characterized in that the heat treatment step is: first perform at least one quenching treatment, each time the quenching temperature is > 890 ° C, water cooling, the water temperature is less than 50 ° C; Fire treatment, tempering temperature is 570 ~ 650 ℃, water cooling or air cooling.
PCT/CN2023/077888 2022-02-23 2023-02-23 Mooring chain steel and production method therefor, and mooring chain and production method therefor WO2023160613A1 (en)

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