WO2017117885A1 - Acier de grade r5 de chaîne d'amarrage à haute résistance et faible sensibilité au traitement thermique et son procédé de fabrication - Google Patents

Acier de grade r5 de chaîne d'amarrage à haute résistance et faible sensibilité au traitement thermique et son procédé de fabrication Download PDF

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Publication number
WO2017117885A1
WO2017117885A1 PCT/CN2016/079024 CN2016079024W WO2017117885A1 WO 2017117885 A1 WO2017117885 A1 WO 2017117885A1 CN 2016079024 W CN2016079024 W CN 2016079024W WO 2017117885 A1 WO2017117885 A1 WO 2017117885A1
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WIPO (PCT)
Prior art keywords
steel
heat treatment
mooring chain
strength
low heat
Prior art date
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PCT/CN2016/079024
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English (en)
Chinese (zh)
Inventor
鲍雪君
曾海霞
樊启航
张旭东
黄二新
陈翀
刘学文
许晓红
Original Assignee
江阴兴澄特种钢铁有限公司
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Publication of WO2017117885A1 publication Critical patent/WO2017117885A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Definitions

  • the present invention belongs to the technical field of mooring chain steel, and in particular relates to an R5 grade mooring chain steel and a manufacturing method thereof.
  • R5 requires higher strength to above lOOOMpa than R4 and R4S, and requires higher impact toughness. Therefore, the same high-strength and high toughness of the chain is one of the R5 grade mooring chain steels.
  • Technical difficulties Since the mooring chain requires high performance uniformity, any one of the loop defects may cause the entire chain to fail, thus requiring high uniformity of the performance of the entire chain.
  • the mechanical properties of the chain depend on the composition design of the steel. The heat treatment process has a great influence on the mechanical properties. Therefore, in order to satisfy the chain production in large quantities, the performance of the entire chain has high uniformity, and the R5 mooring chain is reduced. Heat treatment sensitivity is another problem that needs to be solved in bursting R5 grade mooring chain steel.
  • the key technologies of the R5 grade mooring chain steel manufacturing method are as follows: 1) the same strength meets the high strength performance index and impact toughness of the chain; 2) reduces the heat treatment sensitivity of the R5 mooring chain, and ensures the chain In the mass production of niobium, the uniformity of mechanical properties after heat treatment.
  • the object of the present invention is to provide a high strength, low heat treatment sensitive R5 grade mooring chain steel, to achieve high strength performance index of R5 grade mooring chain steel, mass production of chain steel, improve the pass rate.
  • Another object of the present invention is to provide a method for producing the above-described R5 grade mooring chain steel, which satisfies the performance index of steel.
  • the chemical element composition of the mooring chain steel of the present invention is determined as follows:
  • the C content should not be high, and it is suitable to use low carbon steel.
  • the range of the C content of the present invention is determined to be 0.15 to 0.40%;
  • Si is a reinforced ferrite, which can increase the matrix strength of the material and contribute to the tensile strength of the material.
  • the Si content range of the present invention is determined to be 0.10 to 0.40%;
  • Cr is a medium carbide forming element. Heating the crucible into the austenite Cr strongly enhances the hardenability. The Cr in the steel partially replaces the iron to form an alloy cementite to improve the stability; a part of it is dissolved in the ferrite to cause solid solution strengthening, and the strength and hardness of the ferrite are improved.
  • the range of the Cr content of the present invention is determined to be 0.80 to 2.00%;
  • Ni is a non-carbide forming element. Ni is present in the steel in solid solution form. When used in combination with Cr, the hardenability of steel can be significantly improved. Ni lowers the C content of the eutectoids and increases the volume fraction of pearlite, which is beneficial to increase the strength. Ni lowers the Ar3 transition temperature, making the ferrite grains thinner, and the same, which can reduce the pitch of the pearlite sheet, which is beneficial to the improvement of toughness. According to the carbon equivalent formula, the coefficient of Ni is small, and the damage to the welding performance is small. To ensure the performance of the weld, the range of the Ni content of the present invention is determined to be 0.75 to 1.30%;
  • Mo is present in the solid solution and carbide of steel, has solid solution strengthening effect, can improve the hardenability and tempering stability of steel, can also refine grains, improve carbide non-uniformity, and thereby improve steel. Strength and toughness. Mo has a significant retardation effect on pearlite transformation, and has little effect on bainite transformation, so that all bainite structures can be obtained in a relatively large cooling rate range.
  • the range of the Mo content of the present invention is determined to be 0.30 to 0.70 ⁇ 3 ⁇ 4;
  • Nb is a typical microalloying element, has a strong affinity with C and N, and is capable of forming stable carbonized materials and carbonitrides.
  • the present invention employs a higher quenching temperature, and an appropriate amount of Nb prevents the grains from growing excessively during the heating and holding process. In addition, its role is also reflected in the strengthening of precipitation, improve tempering resistance and so on.
  • the range of the Nb content of the present invention is determined to be 0.01 to 0.06 ⁇ 3 ⁇ 4;
  • the addition of the A1 element is mainly used to refine the crystal grains.
  • the range of the A1 content of the present invention is determined to be 0.02 to 0.05% ;
  • V is one of the most commonly used alloying elements in steel, which reduces the superheat sensitivity of steel and improves the strength and toughness of steel. In quenched and tempered steel, the strength of steel can be improved. In addition, the addition of V to the steel also improves the tempering stability of the steel and reduces the heat treatment sensitivity of the steel.
  • the range of the V content of the present invention is determined to be 0.01 to 0.20%.
  • the invention relates to a method for manufacturing R5 grade mooring chain steel with low heat treatment sensitivity, and the flow is: electric furnace or converter smelting - LF refining - VD or RH vacuum degassing - continuous casting - continuous rolling - slow cooling - heat treatment A finishing - flaw detection of a package.
  • the CCT curve was made on the R5 grade mooring chain steel, and the heat treatment process was guided according to the CCT curve test results.
  • the heat treatment of the steel slab includes two steps of quenching and tempering, wherein the quenching temperature is 880 ° C to 980 ° C, the heat preservation time is 60 to 120 min, water cooling; the tempering temperature is 590 ° C to 640 ° C, and the heat preservation time is 60 ⁇ 180min, water cooled.
  • the quenching temperature is 930 ° C
  • the heat preservation time is 120 min, water cooling
  • the tempering temperature is 620 ° C
  • the heat preservation time is 120 min, and the water is cooled.
  • the present invention performs a CCT curve on a R5 grade mooring chain steel and directs the formulation of the heat treatment process according to the CCT curve.
  • the present invention performs a heat treatment sensitivity test on the R5 mooring chain, and studies the mechanical properties of the R5 mooring chain steel through different quenching temperature and tempering temperature process tests, and finds through a large number of tests and data analysis.
  • the R5 grade mooring chain steel of the invention has the characteristics of low heat treatment sensitivity.
  • the invention designs a heat treatment process for the R5 grade mooring chain steel, optimizes the temperature range of quenching and tempering, reduces the heat treatment sensitivity of the steel, ensures the mechanical properties of the steel, and improves the yield of the steel.
  • 1 is a graph showing a trend of yield strength and tensile strength of a first component R5 steel as a function of quenching temperature in an embodiment of the present invention
  • FIG. 2 is a graph showing a trend of impact energy of a first component R5 steel with a quenching temperature according to an embodiment of the present invention
  • FIG. 3 is a graph showing a trend of yield strength and tensile strength of a first component R5 steel with tempering temperature in an embodiment of the present invention
  • FIG. 4 is a graph showing a trend of impact energy of a second component R5 steel with tempering temperature according to an embodiment of the present invention
  • FIG. 5 is a graph showing a trend of yield strength and tensile strength of a second component R5 steel as a function of quenching temperature in an embodiment of the present invention
  • 6 is a graph showing a trend of impact energy of a second component R5 steel according to a quenching temperature in an embodiment of the present invention
  • 7 is a graph showing a change trend of yield strength and tensile strength of a second component R5 steel with tempering temperature according to an embodiment of the present invention
  • FIG. 9 is a graph showing a trend of yield strength and tensile strength of a third component R5 steel as a function of quenching temperature in an embodiment of the present invention.
  • FIG. 10 is a graph showing a trend of impact energy of a third component R5 steel according to a quenching temperature in an embodiment of the present invention.
  • FIG. 11 is a graph showing a tendency of yield strength and tensile strength of a third component R5 steel with tempering temperature according to an embodiment of the present invention.
  • FIG. 13 is a graph showing a trend of yield strength and tensile strength of a fourth component R5 steel as a function of quenching temperature according to an embodiment of the present invention
  • FIG. 14 is a graph showing a trend of impact energy of a fourth component R5 steel with quenching temperature according to an embodiment of the present invention.
  • 15 is a graph showing a tendency of yield strength and tensile strength of a fourth component R5 steel with tempering temperature according to an embodiment of the present invention.
  • 16 is a graph showing a trend of impact energy of a fourth component R5 steel with tempering temperature according to an embodiment of the present invention.
  • FIG. 17 is a graph showing a preferred heat treatment process of the method of the present invention.
  • FIG. 19 is a graph showing changes in elongation and shrinkage of the second component R5 steel with tempering temperature at a quenching temperature of 930 ° C;
  • 20 is a graph showing the tendency of the elongation and shrinkage of the second component R5 steel to change with the quenching temperature after the tempering temperature is 620 ° C.
  • the high strength, low heat treatment sensitive R5 grade mooring chain steel has a chemical composition of (% by weight): C 0.15 ⁇ 0.40 ⁇ 3 ⁇ 4, Si 0.10 ⁇ 0.40 ⁇ 3 ⁇ 4, Mn 0.70 ⁇ 1.80 ⁇ 3 ⁇ 4, Cr 0.80 ⁇ 2.00 ⁇ 3 ⁇ 4, Mo 0.30 ⁇ 0.70 ⁇ 3 ⁇ 4, Ni 0.75 ⁇ 1.30 ⁇ 3 ⁇ 4, Al 0.020 ⁇ 0.050 ⁇ 3 ⁇ 4, Nb 0.01-0.06%, V 0.05 ⁇ 0.25 ⁇ 3 ⁇ 4, P ⁇ 0.025% , S ⁇ 0.025%, Cu ⁇ 0.25%, N ⁇ 0.0120%, O ⁇ 0.0025%, H ⁇ 0.0002%, and the balance is Fe and unavoidable impurities.
  • the manufacturing process of the mooring chain steel is: electric furnace or converter smelting---LF refining---VD or RH vacuum degassing... continuous casting... continuous rolling... slow cooling... heat treatment... finishing---detection... package. ,
  • the mechanical properties corresponding to the first, second, third, and fourth components are respectively shown in FIG. 1 to FIG. 4, FIG. 5 to FIG. 8 , FIG. 9 to FIG. 12 and FIG. 13 to FIG. 16 , and the influence of quenching temperature on mechanical properties is studied.
  • the fire temperature was set to 620 ° C, and the effect of tempering temperature on mechanical properties was investigated.
  • the quenching temperature was set to 930 ° C.
  • the heat treatment of the steel material includes quenching and tempering, the quenching temperature is 880 ° C - 980 ° C, the heat preservation time is 60-120 mi n, water cooling; the tempering temperature is 590 ° C - 640 ° C, and the heat preservation time is 60- 180 min, water cooled, see Figure 18.
  • the preferred conditions of the above heat treatment process are: quenching temperature is 930 ° C, insulation time 120 min, water cooling, The tempering temperature is 620 ° C, the insulation is 120 min, and the water is cold, see Figure 17.
  • the mechanical properties of the steel of the present invention such as yield strength, tensile strength, elongation, shrinkage, impact work, etc. maintain good uniformity and stability in the quenching and tempering temperature range, and the second component is For example, referring to Fig. 19 and Fig. 20, it is shown that the mooring chain steel material in the embodiment has low heat treatment sensitivity under the premise of satisfying high strength, and the chain is produced in batches with high yield.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention concerne un acier de grade R5 de chaîne d'amarrage, à haute résistance et faible sensibilité au traitement thermique, qui comprend les composants chimiques suivants en pourcentage massique : 0,15 à 0,40 % de C, 0,10 à 0,40 % de Si, 0,70 à 1,80 % de Mn, 0,80 à 2,00 % de Cr, 0,30 à 0,70 % de Mo, 0,75 à 1,30 % de Ni, 0 020 à 0,050 % d'Al, 0,01 à 0,06 % de Nb, 0,05 à 0,20 % de V, une quantité inférieure ou égale à 0,025 % de P, une quantité inférieure ou égale à 0,025 % de S, une quantité inférieure ou égale à 0,25 % de Cu, une quantité inférieure ou égale à 0,0120 ％ de N, une quantité inférieure ou égale à 0,0025 % de O, une quantité inférieure ou égale à 0,0002 % de H, le solde étant composé de Fe et d'impuretés inévitables. Le traitement thermique d'acier en billettes se compose de deux étapes, à savoir la trempe et le revenu; la température de trempe est de 880 à 980 °C, le temps de maintien de cette température étant de 60 à 120 minutes, la trempe étant suivie d'un refroidissement par eau; et la température de revenu est de 590 à 640 °C, le temps de maintien de cette température étant de 60 à 180 minutes, le revenu étant suivi d'un refroidissement par eau.
PCT/CN2016/079024 2016-01-05 2016-04-12 Acier de grade r5 de chaîne d'amarrage à haute résistance et faible sensibilité au traitement thermique et son procédé de fabrication WO2017117885A1 (fr)

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CN201610004325.6A CN105624566A (zh) 2016-01-05 2016-01-05 高强度、低热处理敏感性的r5级系泊链钢及其制造方法
CN201610004325.6 2016-01-05

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CN109136766A (zh) * 2018-09-30 2019-01-04 镇江宝海船舶五金有限公司 一种耐腐蚀系泊链钢及其制备方法
CN109321820A (zh) * 2018-09-30 2019-02-12 镇江宝海船舶五金有限公司 一种高强度r4系泊链钢及其制备方法
CN109023118A (zh) * 2018-09-30 2018-12-18 镇江宝海船舶五金有限公司 一种高性能r4系泊链钢及其制备方法
CN109457085A (zh) * 2018-12-08 2019-03-12 江苏亚星锚链股份有限公司 一种系泊链的热处理工艺
CN109504825A (zh) * 2018-12-11 2019-03-22 江苏亚星锚链股份有限公司 一种r6级系泊链末端链节的热处理工艺
CN110144516B (zh) * 2019-04-16 2020-12-01 江阴兴澄特种钢铁有限公司 一种适用于锚泊定位阴极保护浮体的r6级高强韧性海洋系泊链钢及其系泊链
CN110983205B (zh) * 2019-12-26 2021-01-26 宝钢特钢韶关有限公司 系泊链钢及其制备方法
CN113025878B (zh) * 2021-01-29 2022-07-29 江阴兴澄特种钢铁有限公司 一种油服开采低合金完井工具用调质圆钢及其制造方法
CN114369759A (zh) * 2021-12-20 2022-04-19 江苏亚星锚链股份有限公司 一种耐低温锚链

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