CN106119713A - A kind of low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL and manufacture method thereof - Google Patents
A kind of low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL and manufacture method thereof Download PDFInfo
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- CN106119713A CN106119713A CN201610667339.6A CN201610667339A CN106119713A CN 106119713 A CN106119713 A CN 106119713A CN 201610667339 A CN201610667339 A CN 201610667339A CN 106119713 A CN106119713 A CN 106119713A
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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
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C22C38/02—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
- C22C38/06—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
- C22C38/12—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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The invention belongs to low-alloy steel production technology field, be specifically related to a kind of low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL and manufacture method thereof.Technological process is that KR molten iron pretreatment converter smelting LF, RH refine continuous casting slow cooling continuous casting material heating rolling pre-straightening controls cooling thermal straightening stacking slow cooling cutting finishing.Present invention achieves 60mm 80mm thickness S355NL low yield strength ratio requirement, ensure low-temperature impact and intensity surplus simultaneously.Through field practice, using the steel plate that this programme produces, tensile strength is 510Mpa 550Mpa, and elongation after fracture is 28% 39%, and Charpy-V impact power (laterally) can reach more than 200J at 50 DEG C.
Description
Technical field
The invention belongs to low-alloy steel production technology field, be specifically related to a kind of low-carbon (LC) spy's thickness low yield strength ratio reel steel
S355NL and manufacture method thereof.
Background technology
S355NL belongs to the solderable fine grained structural steel of Europe superscript, when the particularity of this steel grade is requirement-50 DEG C of low temperature of steel
Still keep good impact property, mainly with fields such as large ship, bridge, mining machinery, wind-power tower, high-pressure bottles, with
Bridge under environment of extremely trembling with fear, wind energy project construction, demand low temperature impact properties the most easily being welded to special thick S355NL is more come
The most.
In order to improve welding performance, requirements at the higher level are proposed for C content, Pcm value, it is desirable to steel not only have high intensity, good
Good toughness and welding performance, in order to meet reel needs, it is desirable to low yield strength ratio.In prior art, the S355NL of think gauge is many
Carbon design in employing, uses controlled rolling+normalized condition delivery to meet low temperature impact properties, and the S355NL of normalizing delivery is difficult to meet
Low yield strength ratio and the design of low carbon component.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides a kind of low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL
And manufacture method, this method uses the design of low carbon component, uses controlled rolling rolling and controlled rolling cooling technique, overcome traditional life
Produce manufacture method and be difficult to reduce the limitation of yield tensile ratio, simplify production technology, shorten production procedure, obtained good product
Moral character energy, is suitable for volume industrial and produces, while meeting intensity, toughness and welding performance requirement, it is ensured that low yield strength ratio.
The present invention is to be realized by following technical scheme:
A kind of low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL, the following C:0.06-0.09% of composition, Si of its mass percent:
0.25-0.35%, Mn:1.45-1.60%, P 0.015%, S 0.003%, Al:0.015-0.040%, Nb: 0.025-0.040%,
Ti:0.010-0.025%, surplus is Fe and inevitable impurity.
The manufacture method of above-mentioned low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL, process route is as follows: KR molten iron is pre-
Process converter smelting LF, RH refine continuous casting slow cooling continuous casting material heating rolling pre-straightening and control cooling
Thermal straightening stacking slow cooling-cutting finishing.
The manufacture method of above-mentioned low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL, comprises the steps:
(1) converter smelting: include matching chemical composition, C:0.06-0.09%, Si:0.25-0.35%, Mn:1.45-1.60%, P
0.015%, S 0.003%, Al:0.015-0.040%, Nb: 0.025-0.040%, Ti:0.010-0.025%, surplus be Fe and
Inevitably impurity；Converter uses top and bottom combined blown converter smelting；
(2) LF, RH refine: in order to control gas content and control alloying element, use LF+RH refine, it is ensured that soft blow time, RH
Refine vacuum and vacuum processing time；Degassing terminates rear soft blow time ＞ 20min, RH refine vacuum processing time ＞ 15min；
(3) continuous casting: strict whole process protection is poured into a mould, middle liquid level stabilizing；Continuous casting tundish temperature 1540 DEG C-1550 DEG C, casting machine pulling rate is
1m/s, is casting continuously to form the continuous casting billet of 250mm；
(4) roll forming: use controlled rolling pattern, heats continuous casting material, and heating-up temperature 1180 DEG C-1250 DEG C, during heating
Between 9-10 minute/centimetre, carry out two-stage control rolling；
(5) pre-straightening: use 5 roller pre-straightening machines to carry out high-temperature straightening, reduces steel plate warpage end to end and ensures to enter water-cooling system
Steel plate is straight；
(6) controlled rolling cooling: low cooling rate water-cooled, uses low hydraulic pressure 1.5bar to carry out low cooling rate cooling, rate of cooling 5-8 DEG C/S,
Whole steel plate is cooled to 580 DEG C-600 DEG C；
(7) aligning: use 9 roller straighteners to align, reduces steel plate inside and surface residual stress；
(8) stacking slow cooling: to rolled plate stacking slow cooling 24 hours, then carries out cutting finishing.
In the manufacture method of above-mentioned low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL, continuous casting steel in described step (4)
Base is after the roughing mill first stage rolls, and middle sotck thinkness is 120-160mm, and final finished steel plate thickness is 60mm-
80mm。
In the manufacture method of above-mentioned low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL, in described step (4), roughing is opened
Rolling temperature is 1120 DEG C-1180 DEG C, and roughing finishing temperature is 1050 DEG C-1100 DEG C.
In the manufacture method of above-mentioned low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL, it is characterised in that described step
(4) in, finish rolling start rolling temperature is 850 DEG C-870 DEG C, and finish rolling finishing temperature is 830 DEG C-860 DEG C.
In the manufacture method of above-mentioned low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL, in described (4), the finish rolling stage is
Rear three passage knobbles, use double passes, reduce warpage end to end, it is ensured that after rolling, steel-plate shape is good, smoothly
Enter pre-straightening machine.
In the manufacture method of above-mentioned low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL, described step (1), step (2)
In, steelmaking process controls P, S content by converter, LF and RH, it is desirable to P controls at below 150PPm, and S controls at 30PPm.
Casting process needs to control pulling rate and temperature, it is to avoid serious component segregation occur.Prevent underbead crack, contracting
The internal flaws such as hole.Common process can be used to carry out, in addition to the process conditions of clear stipulaties, the technique that the present invention is not specified
Part is all by state of the art.
Above-mentioned continuous casting material be in austenite recrystallization district, Unhydrated cement and the controlled rolling of deformation induced trans-formation district, logical
Cross the austenite recrystallization controlled rolling of high-temperature region, abundant fining austenite grains；Step of the present invention is cooled down by control in (6)
Speed and final cooling temperature, obtain ferrite+pearlitic structrure.
The present invention the most relatively, has following significant advantage and an effect:
(1) mainly designed by reasonable low-carbon (LC), it is ensured that Pcm value, realize plate property by controlled rolling, controlled rolling cooling, can be
Realize steel plate high intensity, high tenacity and low yield strength ratio in the case of less alloy content, improve welding performance.
(2) controlling rough rolling step drafts, the finish rolling stage uses light reduction multi-pass rolling strategy, and reasonable distribution is depressed
Amount and controlled rolling power, the good profile after being rolled.
(3) by two-stage controlled rolling and roller repairing, carry out slow cooling in 24 hours, obtain ferrite+pearlitic structrure,
Can effectively improve tensile strength, improvement processing hardening, reduce yield tensile ratio, the low-carbon (LC) spy obtaining yield tensile ratio≤0.80 is thick low in the wrong strong
Than reel steel S355NL.
(4) controlled rolling and controlled rolling cooling technique in manufacture method of the present invention, utilizes the continuous casting billet of 250mm to produce 60mm-
The S355NL of 80mm, saves the normalizing process of similar steel plate, shortens production cycle, low cost, improves production efficiency, saves
The energy.
(5) Nb, Ti that low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL steel plate components utilising is a small amount of carries out compound micro-conjunction
Aurification, Nb improves the quenching degree of steel plate.
In a word, the present invention is designed by rational low carbon component, utilizes a small amount of Nb, Ti to carry out combined microalloying, profit
The quenching degree of steel plate is improved with Nb.Finish rolling uses light reduction multi-pass rolling, it is ensured that finishing temperature and plate shape.By controlling eventually
Roll temperature, open cold temperature, enter to control cooling to steel plate after rolling, be organized as ferrite+pearlite after obtaining TMCP, it is ensured that intensity
With toughness simultaneously, yield tensile ratio is reduced.This invented technology uses low-carbon (LC) design, improves welding performance, reduces yield tensile ratio, overcome
Conventional normalized treatment mode production cycle length, the shortcoming that cost is high, can be thick with the 60mm-80mm low-carbon (LC) spy that production performance is stable
Low yield strength ratio reel steel S355NL steel plate.
Accompanying drawing explanation
Fig. 1 is the metallograph of the embodiment of the present invention 1 product.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further described, in order to those skilled in the art knows more about
The present invention, but and it is not so limited the present invention.
The manufacture method of low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL of the present invention, process route is:
KR molten iron pretreatment converter smelting LF, RH refine continuous casting slow cooling continuous casting material heating rolling de-distortion
Straight control cools down thermal straightening stacking slow cooling-cutting finishing.
Embodiment 1 one kinds of low-carbon (LC)s spy thickness low yield strength ratio reel steel S355NL and manufacture methods thereof
(1) needed for producing steel plate, main component is by weight percentage: C:0.075%, Si:0.26%, Mn:1.47%, P:
0.009%, S:0.002%, Nb:0.030%, Ti:0.016%, Al:0.031%, remaining is Fe and inevitable impurity；
(2) the above-mentioned raw material prepared is smelted in 210 tons of converters, and converter uses top and bottom combined blown converter smelting, uses LF+RH essence
Refining, degassing terminates rear soft blow time ＞ 20min, RH refine vacuum processing time ＞ 15min；
(3) continuous casting tundish temperature 1540 DEG C-1550 DEG C, casting machine pulling rate is 1m/s, is casting continuously to form 250mm × 2200mm × 3520mm
Continuous casting billet, continuous casting billet is heated to 1200 DEG C, 9-10 minute/centimetre heat time heating time；
(4) using molding, broadening, extension three stage rolling, roughing mill rolls 6 passages, and start rolling temperature is 1148 DEG C, roughing finish to gauge
Temperature 1070 DEG C, completes molding, broadening and first stage extension rolling；Middle blank is 120mm, finishing mill start rolling temperature 860
DEG C, use 8 passes, be finally rolled into 60mm × 3520mm × 93700mm steel plate after system, finish rolling finishing temperature 850 DEG C；
(5) use 5 roller pre-straightening machines to carry out high-temperature straightening, reduce steel plate warpage end to end and ensure that entering water-cooling system steel plate puts down
Directly；
(6) controlling cooling after steel plate rolls, use low hydraulic pressure 1.5bar to carry out low cooling rate cooling, opening cold temperature is 820 DEG C, cooling
6 DEG C/s of speed, after cooling, surface of steel plate temperature is 598 DEG C；
(7) use 9 roller straighteners to align, reduce steel plate inside and surface residual stress；
(8) rear steel plate stacking slow cooling 24 hours is rolled.
The present embodiment produces the metallograph of product as it is shown in figure 1, product actual measurement thickness 60.12mm, C are
0.075%, Pcm are 0.16, meet low-carbon (LC) requirement and Pcm ＜ 0.18.Mechanics testing result is: yield strength ReH:
387Mpa, tensile strength Rm:547Mpa, yield tensile ratio (Rel/ Rm): 0.71, elongation percentage δ: 37.5% ,-50 DEG C of ballistic work CVN1:
286.8J, ballistic work CVN2:267.7J, ballistic work CVN3:269.9J, clod wash: qualified.Chemical composition, mechanical property meet state
Family's standard and client's low yield strength ratio requirement.
Embodiment 2 one kinds of low-carbon (LC)s spy thickness low yield strength ratio reel steel S355NL and manufacture methods thereof
(1) needed for producing steel plate, main component is by weight percentage: C:0.070%, Si:0.30%, Mn:1.55%, P:
0.008%, S:0.001%, Nb:0.028%, Ti:0.016%, Al:0.034%, remaining is Fe and inevitable impurity；
(2) the above-mentioned raw material prepared is smelted in 210 tons of converters, and converter uses top and bottom combined blown converter smelting, uses LF+RH essence
Refining, degassing terminates rear soft blow time ＞ 20min, RH refine vacuum processing time ＞ 15min；
(3) continuous casting tundish temperature 1540 DEG C-1550 DEG C, casting machine pulling rate is 1m/s, is casting continuously to form 250mm × 2200mm × 3500mm
Continuous casting billet, continuous casting billet is heated to 1200 DEG C, 9-10 minute/centimetre heat time heating time；
(4) using molding, broadening, extension three stage rolling, roughing mill rolls 6 passages, and start rolling temperature is 1157 DEG C, roughing finish to gauge
Temperature 1060 DEG C, completes molding, broadening and first stage extension rolling；Middle blank is 150mm, finishing mill start rolling temperature 850
DEG C, use 8 passes, be finally rolled into 80mm × 2650mm × 92600mm steel plate after system, finish rolling finishing temperature 845 DEG C；
(5) use 5 roller pre-straightening machines to carry out high-temperature straightening, reduce steel plate warpage end to end and ensure that entering water-cooling system steel plate puts down
Directly；
(6) at steel plate roller repairing, using low hydraulic pressure 1.5bar to carry out low cooling rate cooling, opening cold temperature is 820 DEG C, cooling speed: 5
DEG C/s, after cooling, surface of steel plate temperature is 591 DEG C；
(7) use 9 roller straighteners to align, reduce steel plate inside and surface residual stress；
(8) rear steel plate stacking slow cooling 24 hours is rolled.
The product produced in the present embodiment, actual measurement thickness 79.15mm, mechanics testing result is: yield strength
ReH:391Mpa, tensile strength Rm:531Mpa, yield tensile ratio (Rel/ Rm): 0.736, elongation percentage δ: 33.5% ,-50 DEG C of ballistic works
CVN1:252.0J, CVN2:253.8J, CVN3:250.9J, clod wash: qualified.Chemical composition, mechanical property meet national standard and
Client's low yield strength ratio requirement.
Claims (9)
1. a low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL, it is characterised in that described steel plate chemical composition percent mass
The composition of ratio is as follows: C:0.06-0.09%, Si:0.25-0.35%, Mn:1.45-1.60%, P 0.015%, S 0.003%, Al:
0.015-0.040%, Nb: 0.025-0.040%, Ti:0.010-0.025%, surplus is Fe and inevitable impurity.
The manufacture method of a kind of low-carbon (LC) spy thickness low yield strength ratio reel steel S355NL the most as claimed in claim 1, its feature exists
In, process route is as follows:
KR molten iron pretreatment converter smelting LF, RH refine continuous casting slow cooling continuous casting material heating rolling de-distortion
Straight control cools down thermal straightening stacking slow cooling-cutting finishing.
Manufacture method the most according to claim 2, it is characterised in that described manufacture method comprises the steps:
(1) converter smelting: include matching chemical composition, C:0.06-0.09%, Si:0.25-0.35%, Mn:1.45-1.60%, P
0.015%, S 0.003%, Al:0.015-0.040%, Nb: 0.025-0.040%, Ti:0.010-0.025%, surplus be Fe and
Inevitably impurity；Converter uses top and bottom combined blown converter smelting；
(2) LF, RH refine: use LF+RH refine, degassing to terminate rear soft blow time ＞ 20min, RH refine vacuum processing time ＞
15min；
(3) continuous casting: whole process protection is poured into a mould, middle liquid level stabilizing；Continuous casting tundish temperature 1540 DEG C-1550 DEG C, casting machine pulling rate is 1m/s,
It is casting continuously to form the continuous casting billet of 250mm；
(4) roll forming: use controlled rolling pattern, heats continuous casting material, and heating-up temperature 1180 DEG C-1250 DEG C, during heating
Between 9-10 minute/centimetre, carry out two-stage control rolling；
(5) pre-straightening: use 5 roller pre-straightening machines to carry out high-temperature straightening；
(6) controlled rolling cooling: using low hydraulic pressure 1.5bar to carry out low cooling rate cooling, rate of cooling 5-8 DEG C/S, final steel plate is cooled to
580℃-600℃；
(7) aligning: use 9 roller straighteners to align；
(8) stacking slow cooling: to rolled plate stacking slow cooling 24 hours, then carries out cutting finishing.
Manufacture method the most according to claim 3, it is characterised in that in described step (1) and step (2), steelmaking process
Controlling P, S content by converter, LF and RH, P controls at below 150PPm, and S controls at 30PPm.
Manufacture method the most according to claim 3, it is characterised in that in described step (4), continuous casting steel billet is through roughing mill
After first stage rolling, middle sotck thinkness is 120-160mm, and final finished steel plate thickness is 60mm-80mm.
Manufacture method the most according to claim 3, it is characterised in that in described step (4), roughing start rolling temperature is 1120
DEG C-1180 DEG C, roughing finishing temperature is 1050 DEG C-1100 DEG C.
Manufacture method the most according to claim 3, it is characterised in that in described step (4), finish rolling start rolling temperature is 850
DEG C-870 DEG C, finish rolling finishing temperature is 830 DEG C-860 DEG C.
Manufacture method the most according to claim 3, it is characterised in that finish rolling stage last three passages in described step (4)
Knobble, uses double passes.
Manufacture method the most according to claim 3, it is characterised in that in described step (4), continuous casting material is at austenite
Recrystallization zone, Unhydrated cement and the controlled rolling of deformation induced trans-formation district, by the austenite recrystallization controlled rolling of high-temperature region,
Fining austenite grains.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109092903A (en) * | 2018-07-13 | 2018-12-28 | 舞阳钢铁有限责任公司 | The production method of TMCP type S355G8+M-Z35 steel plate |
| CN110106441A (en) * | 2019-05-14 | 2019-08-09 | 南京钢铁股份有限公司 | TMCP type surrenders 370MPa high-performance bridge steel plate and production method |
| CN111534741A (en) * | 2020-04-29 | 2020-08-14 | 鞍钢股份有限公司 | Method for rolling steel X56Mo for submarine pipeline |
| CN111809117A (en) * | 2020-07-08 | 2020-10-23 | 首钢集团有限公司 | Steel with high fracture toughness and low aging sensitivity for offshore wind power and production method thereof |
| CN112246910A (en) * | 2020-09-15 | 2021-01-22 | 首钢集团有限公司 | Method for improving performance uniformity of thermomechanically-rolled steel plate and thermomechanically-rolled steel plate |
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| CN114737133A (en) * | 2022-03-23 | 2022-07-12 | 江阴兴澄特种钢铁有限公司 | Low-yield-ratio high-toughness structural steel plate and manufacturing method thereof |
| CN115106493A (en) * | 2022-06-16 | 2022-09-27 | 山西太钢不锈钢股份有限公司 | Method for improving center density of S355NL steel continuous casting billet for wind power flange |
| CN115305330A (en) * | 2022-07-28 | 2022-11-08 | 鞍钢股份有限公司 | Shape control method for 460 MPa-grade thick steel plate with thickness greater than 50mm |
| CN117210763A (en) * | 2023-09-15 | 2023-12-12 | 重庆钢铁股份有限公司 | Q355MC steel plate with low yield ratio and production method thereof |
| CN118086651A (en) * | 2024-04-22 | 2024-05-28 | 江苏省沙钢钢铁研究院有限公司 | High Jiang Tehou steel plate and production method thereof |
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|---|---|---|---|---|
| JPS59205454A (en) * | 1983-05-09 | 1984-11-21 | Daido Steel Co Ltd | Free cutting steel and preparation thereof |
| CN102345055A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | Weldable fine grain structural steel S355NL/S355NLZ35 steel plate and its production method |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109092903A (en) * | 2018-07-13 | 2018-12-28 | 舞阳钢铁有限责任公司 | The production method of TMCP type S355G8+M-Z35 steel plate |
| CN110106441A (en) * | 2019-05-14 | 2019-08-09 | 南京钢铁股份有限公司 | TMCP type surrenders 370MPa high-performance bridge steel plate and production method |
| CN111534741A (en) * | 2020-04-29 | 2020-08-14 | 鞍钢股份有限公司 | Method for rolling steel X56Mo for submarine pipeline |
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