CN105624566A - R5 grade mooring chain steel with high strength and low heat treatment sensitivity and manufacturing method of R5 grade mooring chain steel - Google Patents
R5 grade mooring chain steel with high strength and low heat treatment sensitivity and manufacturing method of R5 grade mooring chain steel Download PDFInfo
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- CN105624566A CN105624566A CN201610004325.6A CN201610004325A CN105624566A CN 105624566 A CN105624566 A CN 105624566A CN 201610004325 A CN201610004325 A CN 201610004325A CN 105624566 A CN105624566 A CN 105624566A
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to R5 grade mooring chain steel with high strength and low heat treatment sensitivity. The R5 grade mooring chain steel is prepared from the following chemical components in percentage by mass: 0.15 to 0.40 percent of C, 0.10 to 0.40 percent of Si, 0.70 to 1.80 percent of Mn, 0.80 to 2.00 percent of Cr, 0.30 to 0.70 percent of Mo, 0.75 to 1.30 percent of Ni, 0.020 to 0.050 percent of Al, 0.01 to 0.06 percent of Nb, 0.05 to 0.20 percent of V, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.25 percent of Cu, less than or equal to 0.0120 percent of N, less than or equal to 0.0025 percent of O, less than or equal to 0.0002 percent of H and the balance being Fe and inevitable impurities. The heat treatment of steel billets consists of quenching and tempering, wherein the quenching temperature is 880 to 980DEG C, the insulation time is 60 to 120 minutes, and water cooling is carried out; and the tempering temperature is 590 to 640DEG C, the insulation time is 60 to 180DEG C, and water cooling is carried out. The R5 grade mooring chain steel disclosed by the invention has the advantages that by using quenching and tempering techniques, the heat treatment sensitivity of steel is reduced, mechanical properties of the steel are guaranteed, and the finished product rate of the steel is improved.
Description
Technical field
The invention belongs to mooring chain steel technical field, be specifically related to a kind of R5 level mooring chain steel and manufacture method thereof.
Background technology
Along with ocean engineering develops to deep-sea, all kinds of facilities are also more and more higher to the requirement of mooring cable performance. Improving the bearing load of mooring cable, one is the specification improving chain, and two is the strengthening grade improving chain. Although marine facility tends to maximization, specialization, but the expansion of diameter chain is limited by the restriction of factors, so needing the impact that the mooring cable of higher intensity rank brings to overcome the unfavorable conditions such as severe sea condition. Mooring cable is divided into R3, R3S, R4 according to tensile strength, its chain link after heat treatment intensity respectively 690MPa, 770MPa and 860MPa. But these products can not fully meet the needs of ocean engineering development, and therefore, the exploitation of the R5 level mooring cable of higher intensity is extremely urgent.
DNV-OS-E302-2013-10 and MooringChainGuide-ABS2009 version is already by included for R5 level mooring cable, R4 rank mooring cable material foundation must improve more than 15% tensile strength (>=1000Mpa), the requirement that the technical specifications such as intensity and toughness, fatigue behaviour and the stress corrosion resistant that simultaneously to guarantee material specify, ABS, DNV classification society latest edition specification to the mechanical property requirements of R4, R4S, R5 level material in Table 1:
Table 1
As it can be seen from table 1 R5 relatively R4, R4S both require to improve intensity to more than 1000Mpa, and require higher impact flexibility, therefore, meet chain high intensity simultaneously and high tenacity is to develop a technical barrier of R5 level mooring chain steel.
Owing to performance uniformity is required higher by mooring cable, the defect of any ring can result in whole chain and lost efficacy, therefore it is required that the performance of whole pitch chain has high uniformity. The mechanical property of chain designs except the composition depending on steel, Technology for Heating Processing is very big on the impact of mechanical property, therefore, in order to meet chain when producing in enormous quantities, the performance of whole pitch chain has high uniformity, reduce the heat treatment sensitivity of R5 level mooring cable, be the another problem needing to solve of exploitation R5 level mooring chain steel.
In sum, the key technology of R5 level mooring chain steel making method is as follows: 1) meet chain high-intensity performance index and impact flexibility simultaneously; 2) reduce R5 level mooring cable heat treatment sensitivity, it is ensured that chain produce in enormous quantities time, the uniformity of mechanical property after heat treatment.
Summary of the invention
It is an object of the invention to provide the R5 level mooring chain steel of a kind of high intensity, low heat treatment sensitivity, it is achieved the high-intensity performance index of R5 level mooring chain steel, during circular chain steel batch production, improve qualification rate.
Another object of the present invention is to provide the manufacture method of above-mentioned R5 level mooring chain steel, meets the performance indications of steel.
This invention address that the technical scheme that the problems referred to above adopt is: the R5 level mooring chain steel of a kind of low heat treatment sensitivity, chemical composition is by mass percentage, C0.20��0.26%, Si0.10��0.40%, Mn0.70��1.80%, Cr0.80��2.00%, Mo0.30��0.70%, Ni0.75��1.30%, Al0.020��0.050%, Nb0.01��0.06%, V0.05��0.20%, P��0.025%, S��0.025%, Cu��0.25%, N��0.0120%, O��0.0025%, H��0.0002%, surplus is Fe and inevitable impurity.
The chemical element composition of mooring chain steel of the present invention is determined according to as follows:
1) determination of C content
Considering the plasticity of steel, toughness, machinability and weldability, C content is unsuitable high, selects mild steel appropriate. The scope of C content of the present invention is defined as 0.15��0.40%;
2) determination of Si content
Si herein is reinforced ferrite, can improve the matrix strength of material, Tensile strength is had contribution. The Si content range of the present invention is defined as 0.10��0.40%;
3) determination of Mn content
By carbon equivalent formula it can be seen that the coefficient of Mn is higher, the harm of welding performance is bigger. The scope of Mn content of the present invention is defined as 0.70��1.80%;
4) determination of Cr content
Cr is medium carbide former. Dissolve in austenitic Cr during heating and strongly improve quenching degree. Cr in steel, part displacement ferrum forms alloyed cementite, improves stability; A part is dissolved in ferrite, produces solution strengthening, improves ferritic intensity and hardness. The scope of Cr content of the present invention is defined as 0.80��2.00%;
5) determination of Ni content
Ni is non-carbide former. Ni is present in steel with solution. With Cr with the use of time, be remarkably improved the quenching degree of steel. Ni reduces the C content of eutectoid point, increases the volume fraction of pearlite, is conducive to improving intensity. Ni reduces Ar3 transition temperature, makes ferrite crystal grain attenuate, and meanwhile, pearlite interlamellar spacing can be made to reduce, be conducive to the raising of toughness. By carbon equivalent formula it can be seen that the coefficient of Ni is less, the harm of welding performance is less, for ensureing commissure performance, the scope of Ni content of the present invention is defined as 0.75��1.30%;
6) determination of Mo content
Mo is present in solid solution and the carbide of steel, has solution strengthening effect, can improve quenching degree and the temper resistance of steel, moreover it is possible to crystal grain thinning, improve carbide inhomogeneities, thus improving intensity and the toughness of steel. Perlitic transformation is had significant retardation function by Mo, and bainite transformation impact is less, thus can obtain the tissue being entirely bainite within the scope of sizable rate of cooling. The scope of Mo content of the present invention is defined as 0.30��0.70%;
7) determination of Nb content
Nb is typical micro alloying element, has very strong affinity with C, N, it is possible to form stable carbide and carbonitride. Present invention employs higher hardening heat, appropriate Nb can stop crystal grain too to be grown up in heating and thermal insulation process. It addition, its effect is also embodied in precipitation strength, improves the aspects such as resistance to tempering. The scope of Nb content of the present invention is defined as 0.01��0.06%;
8) determination of Al content
Add Al element and be primarily used to crystal grain thinning. The scope of Al content of the present invention is defined as 0.02��0.05%;
9) determination of V content
V is one of alloying element the most frequently used in steel, reduces the superheated susceptivity of steel, improves intensity and the toughness of steel, in quenched and tempered steel, can improve the intensity of steel. It addition, add V in steel can also improve steel belt roof bolt stability, reduce Heat-Treatment of Steel sensitivity. The scope of V content of the present invention is defined as 0.01��0.20%.
The manufacture method of the R5 level mooring chain steel of the corresponding low heat treatment sensitivity of the present invention, flow process is: electric furnace or converter smelting, and---------continuous casting------------pack heat treatment tandem rolling in slow cooling by finishing---flaw detection---in VD or RH vacuum outgas in LF refine.
By R5 level mooring chain steel has been done CCT curve, and instruct the formulation of Technology for Heating Processing according to CCT curve result of the test.
The heat treatment of steel billet includes quenching and tempering two step, and wherein hardening heat is 880 DEG C��980 DEG C, temperature retention time 60��120min, water-cooled; Temperature 590 DEG C��640 DEG C, temperature retention time 60��180min, water-cooled.
It is preferred that: hardening heat is 930 DEG C, temperature retention time 120min, water-cooled; Temperature is 620 DEG C, temperature retention time 120min, water-cooled. R5 level mooring chain steel has been done CCT curve by the present invention, and instructs the formulation of Technology for Heating Processing according to CCT curve.
R5 level mooring cable has been done heat treatment sensitivity tests by the present invention, engineer testing by different hardening heats and temperature, the mechanical property change of research R5 level mooring chain steel, being found by lot of experiments and data analysis, R5 level mooring chain steel of the present invention has the feature of low heat treatment sensitivity.
Compared with prior art, it is an advantage of the current invention that: the present invention is directed to R5 level mooring chain steel and design its Technology for Heating Processing, optimize the temperature range of quenching and tempering, reduce the heat treatment sensitivity of steel, ensure that the mechanical property of steel, improve the yield rate of steel.
Accompanying drawing explanation
Fig. 1 be in the embodiment of the present invention yield strength of the first component R5 steel, tensile strength with hardening heat changing trend diagram;
Fig. 2 be in the embodiment of the present invention ballistic work of the first component R5 steel with hardening heat changing trend diagram;
Fig. 3 be in the embodiment of the present invention yield strength of the first component R5 steel, tensile strength with temperature changing trend diagram;
Fig. 4 be in the embodiment of the present invention ballistic work of second component R5 steel with temperature changing trend diagram;
Fig. 5 be in the embodiment of the present invention yield strength of second component R5 steel, tensile strength with hardening heat changing trend diagram;
Fig. 6 be in the embodiment of the present invention ballistic work of second component R5 steel with hardening heat changing trend diagram;
Fig. 7 be in the embodiment of the present invention yield strength of second component R5 steel, tensile strength with temperature changing trend diagram;
Fig. 8 be in the embodiment of the present invention ballistic work of second component R5 steel with temperature changing trend diagram;
Fig. 9 be in the embodiment of the present invention yield strength of the 3rd component R5 steel, tensile strength with hardening heat changing trend diagram;
Figure 10 be in the embodiment of the present invention ballistic work of the 3rd component R5 steel with hardening heat changing trend diagram;
Figure 11 be in the embodiment of the present invention yield strength of the 3rd component R5 steel, tensile strength with temperature changing trend diagram;
Figure 12 be in the embodiment of the present invention ballistic work of the 3rd component R5 steel with temperature changing trend diagram;
Figure 13 be in the embodiment of the present invention yield strength of the 4th component R5 steel, tensile strength with hardening heat changing trend diagram;
Figure 14 be in the embodiment of the present invention ballistic work of the 4th component R5 steel with hardening heat changing trend diagram;
Figure 15 be in the embodiment of the present invention yield strength of the 4th component R5 steel, tensile strength with temperature changing trend diagram;
Figure 16 be in the embodiment of the present invention ballistic work of the 4th component R5 steel with temperature changing trend diagram;
Figure 17 is the preferred heat treatment cycle curve figure of the inventive method;
Figure 18 is the CCT curve figure of mooring chain steel in the embodiment of the present invention;
Figure 19 be hardening heat 930 DEG C constant time, the elongation percentage of second component R5 steel, shrinkage factor are with temperature changing trend diagram;
Figure 20 be temperature 620 DEG C constant time, the elongation percentage of second component R5 steel, shrinkage factor are with hardening heat changing trend diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
The high intensity that the present embodiment relates to, low heat treatment sensitivity R5 level mooring chain steel, its chemical composition consists of (percentage by weight): C0.15��0.40%, Si0.10��0.40%, Mn0.70��1.80%, Cr0.80��2.00%, Mo0.30��0.70%, Ni0.75��1.30%, Al0.020��0.050%, Nb0.01��0.06%, V0.05��0.25%, P��0.025%, S��0.025%, Cu��0.25%, N��0.0120%, O��0.0025%, H��0.0002%, surplus is Fe and inevitable impurity.
The manufacturing process of mooring chain steel is: electric furnace or converter smelting, and---------continuous casting------------pack heat treatment tandem rolling in slow cooling by finishing---flaw detection---in VD or RH vacuum outgas in LF refine. ,
Owing to alloy element Nb and V are the key factors reducing R5 level mooring cable heat treatment sensitivity, during test, other alloying element is basically unchanged, and adjusts the content of Nb and V respectively, sees table 2 below, compare the variation tendency of mechanical property.
Table 2
| Sequence number | Nb(0.01%��0.06%) | V(0.05%��0.20%) | Remarks |
| First group | 0.02 | 0.080 | Lower limit |
| Second group | 0.031 | 0.097 | Middle limit |
| 3rd group | 0.046 | 0.121 | The upper limit |
| 4th group | 0.005 | 0.03 | Lower than design composition |
Mechanical property See Figure 1��4, Fig. 5��8, Fig. 9��12, Figure 13��16 respectively that first, second, third and fourth composition point is corresponding, when research hardening heat is to Effect on Mechanical Properties, temperature be set as 620 DEG C constant, research temperature to Effect on Mechanical Properties time, hardening heat be set as 930 DEG C constant.
By Fig. 1��8 it can be seen that when hardening heat 930 DEG C is constant, when temperature is 650 DEG C, tensile strength, lower than 1000MPa, is unsatisfactory for classification society's requirement, therefore temperature not can exceed that 640 DEG C; By Fig. 9��12 it can be seen that when Nb, V content control when the upper limit, Strength surplus amount is big, and has good toughness; From Figure 13��16, when hardening heat 930 DEG C is constant, when temperature is 590 DEG C, 600 DEG C, tensile strength > 1000MPa, once temperature is more than 610 DEG C, tensile strength < 1000MPa, is unsatisfactory for classification society's requirement, and the 4th component steel impact flexibility is poor. Therefore, addition alloying element V, Nb that the second composition point is most suitable, suitable, can greatly reduce the heat treatment sensitivity of R5 level mooring cable.
The heat treatment of steel includes quenching and tempering, described hardening heat 880 DEG C-980 DEG C, temperature retention time 60-120min, water-cooled; Temperature 590 DEG C-640 DEG C, temperature retention time 60-180min, water-cooled, referring to Figure 18.
The optimum condition of above-mentioned Technology for Heating Processing is: hardening heat is 930 DEG C, temperature retention time 120min, water-cooled, and temperature is 620 DEG C, temperature retention time 120min, and water-cooled, referring to Figure 17.
The mechanical property of steel of the present invention such as yield strength, tensile strength, percentage elongation, shrinkage factor, ballistic work etc. keep preferably uniformly in quenching, temperature interval, stationarity, for second component, referring to Figure 19,20, illustrate that in the present embodiment, mooring cable steel have low heat treatment sensitivity under the premise meeting high intensity, during chain batch production, qualification rate is high.
Claims (4)
1. the R5 level mooring chain steel of a high intensity, low heat treatment sensitivity, it is characterised in that: chemical composition is by mass percentage, C0.15��0.40%, Si0.10��0.40%, Mn0.70��1.80%, Cr0.80��2.00%, Mo0.30��0.70%, Ni0.75��1.30%, Al0.020��0.050%, Nb0.01��0.06%, V0.05��0.25%, P��0.025%, S��0.025%, Cu��0.25%, N��0.0120%, O��0.0025%, H��0.0002%, surplus is Fe and inevitable impurity.
2. the method for the R5 level mooring chain steel of high intensity, low heat treatment sensitivity described in a manufacturing claims 1, it is characterized in that: include the heat treatment to steel billet, being made up of quenching and tempering two step, wherein hardening heat is 880 DEG C��980 DEG C, temperature retention time 60��120min, water-cooled; Temperature 590 DEG C��640 DEG C, temperature retention time 60��180min, water-cooled.
3. the manufacture method of the R5 level mooring chain steel of high intensity, low heat treatment sensitivity according to claim 2, it is characterised in that: hardening heat is 930 DEG C, temperature retention time 120min, water-cooled; Temperature is 620 DEG C, temperature retention time 120min, water-cooled.
4. the manufacture method of the R5 level mooring chain steel of high intensity, low heat treatment sensitivity according to claim 2, it is characterised in that: flow process is: electric furnace or converter smelting, and---------continuous casting------------pack heat treatment tandem rolling in slow cooling by finishing---flaw detection---in VD or RH vacuum outgas in LF refine.
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| CN201610004325.6A CN105624566A (en) | 2016-01-05 | 2016-01-05 | R5 grade mooring chain steel with high strength and low heat treatment sensitivity and manufacturing method of R5 grade mooring chain steel |
| PCT/CN2016/079024 WO2017117885A1 (en) | 2016-01-05 | 2016-04-12 | R5-grade mooring chain steel with high strength and low heat treatment sensitivity and manufacturing method therefor |
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Cited By (9)
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| CN109023118A (en) * | 2018-09-30 | 2018-12-18 | 镇江宝海船舶五金有限公司 | A kind of high-performance R4 mooring chain steel and preparation method thereof |
| CN109136766A (en) * | 2018-09-30 | 2019-01-04 | 镇江宝海船舶五金有限公司 | A kind of corrosion resistant mooring chain steel and preparation method thereof |
| CN109321820A (en) * | 2018-09-30 | 2019-02-12 | 镇江宝海船舶五金有限公司 | A kind of high intensity R4 mooring chain steel and preparation method thereof |
| CN109457085A (en) * | 2018-12-08 | 2019-03-12 | 江苏亚星锚链股份有限公司 | A kind of heat treatment process of mooring cable |
| CN109504825A (en) * | 2018-12-11 | 2019-03-22 | 江苏亚星锚链股份有限公司 | A kind of heat treatment process of R6 grades of mooring cable inboard end chain length |
| CN110144516A (en) * | 2019-04-16 | 2019-08-20 | 江阴兴澄特种钢铁有限公司 | A kind of R6 grade high-strength tenacity marine mooring chain steel and its mooring cable suitable for the positioning cathodic protection floating body that anchors |
| CN110983205A (en) * | 2019-12-26 | 2020-04-10 | 宝钢特钢韶关有限公司 | Mooring chain steel and preparation method thereof |
| CN113025878A (en) * | 2021-01-29 | 2021-06-25 | 江阴兴澄特种钢铁有限公司 | Quenching and tempering round steel for oil-well low-alloy well completion tool and manufacturing method thereof |
| CN114369759A (en) * | 2021-12-20 | 2022-04-19 | 江苏亚星锚链股份有限公司 | Low temperature resistant anchor chain |
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| CN109023118A (en) * | 2018-09-30 | 2018-12-18 | 镇江宝海船舶五金有限公司 | A kind of high-performance R4 mooring chain steel and preparation method thereof |
| CN109136766A (en) * | 2018-09-30 | 2019-01-04 | 镇江宝海船舶五金有限公司 | A kind of corrosion resistant mooring chain steel and preparation method thereof |
| CN109321820A (en) * | 2018-09-30 | 2019-02-12 | 镇江宝海船舶五金有限公司 | A kind of high intensity R4 mooring chain steel and preparation method thereof |
| CN109457085A (en) * | 2018-12-08 | 2019-03-12 | 江苏亚星锚链股份有限公司 | A kind of heat treatment process of mooring cable |
| CN109504825A (en) * | 2018-12-11 | 2019-03-22 | 江苏亚星锚链股份有限公司 | A kind of heat treatment process of R6 grades of mooring cable inboard end chain length |
| CN110144516A (en) * | 2019-04-16 | 2019-08-20 | 江阴兴澄特种钢铁有限公司 | A kind of R6 grade high-strength tenacity marine mooring chain steel and its mooring cable suitable for the positioning cathodic protection floating body that anchors |
| CN110144516B (en) * | 2019-04-16 | 2020-12-01 | 江阴兴澄特种钢铁有限公司 | R6-grade high-strength and high-toughness marine mooring chain steel suitable for anchoring positioning cathodic protection floating body and mooring chain thereof |
| CN110983205A (en) * | 2019-12-26 | 2020-04-10 | 宝钢特钢韶关有限公司 | Mooring chain steel and preparation method thereof |
| CN110983205B (en) * | 2019-12-26 | 2021-01-26 | 宝钢特钢韶关有限公司 | Mooring chain steel and preparation method thereof |
| CN113025878A (en) * | 2021-01-29 | 2021-06-25 | 江阴兴澄特种钢铁有限公司 | Quenching and tempering round steel for oil-well low-alloy well completion tool and manufacturing method thereof |
| CN113025878B (en) * | 2021-01-29 | 2022-07-29 | 江阴兴澄特种钢铁有限公司 | Quenching and tempering round steel for oil-well low-alloy well completion tool and manufacturing method thereof |
| CN114369759A (en) * | 2021-12-20 | 2022-04-19 | 江苏亚星锚链股份有限公司 | Low temperature resistant anchor chain |
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