CN101250664A - Hull structural steel with excellent welding performance and producing method thereof - Google Patents
Hull structural steel with excellent welding performance and producing method thereof Download PDFInfo
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- CN101250664A CN101250664A CNA2008100471983A CN200810047198A CN101250664A CN 101250664 A CN101250664 A CN 101250664A CN A2008100471983 A CNA2008100471983 A CN A2008100471983A CN 200810047198 A CN200810047198 A CN 200810047198A CN 101250664 A CN101250664 A CN 101250664A
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Abstract
The invention discloses a hull structure steel with excellent welding performance and the manufacturing method thereof, which belongs to the manufacturing field of low-carbon low-alloy high strength steel, and hull structure steel with excellent welding performance can be manufactured through utilizing the invention. According to the percentage by weight, the chemical components of the steel comprise C 0.05-0.25%, Si 0.01-1.0%, Mn 0.50-2.0%, P<=0.020%, S<=0.010%, Ti 0.005-0.10%, Nb 0.005-0.10%, and others are Fe and unavoidable impurities, and the chemical components satisfy the following relationship: firstly, 0.015%<=C*Si<=0.075%, secondly, 0.095%<=C*Mn<=0.15%, thirdly, 0.0003%<=Nb*Ti<=0.0005%. The specific manufacturing method comprises the following steps: heating bar plates, roughly rolling, finish rolling, water cooling and air cooling. The steel has high welding performance and mechanical property, and does not contain alloy elements such as Ni, Mo and the like, the manufacturing process is easy to control, and the operation is simple.
Description
Technical field
The present invention relates to the low-carbon and low-alloy high-strength steel and make the field, a kind of specifically hull structural steel with excellent welding performance is applied to shipping industry.
Background technology
Shipping industry has vast potential for future development, and along with the development of world economy and the growth of trade, the boats and ships demand constantly rises.Major transformation is just taking place in world today's shipbuilding: the one, and new and high technology is concentrated to shipping industry day by day; The 2nd, the quickening of the world economy technology integration process has promoted the development of international shipping industry, for shipbuilding provides the vast market demand.Shipbuilding has stronger pulling function to national economy, greatly develops shipbuilding industry, can drive the fast development of every profession and trades such as machinery, metallurgy, electronics, equipment.Along with the maximization of tonneaux de jauge, shipbuilding is also more and more higher to the over-all properties requirement of hull structural steel, not only requires steel plate to have the good mechanical performance, but also require to have good welding property, to improve shipbuilding efficient, accelerate the manufacturing progress, improve the welding operation environment.The hull structural steel excellent welding performance is embodied in after various welding processs (welding technique such as manual metal-arc welding, union melt welding, electro-gas (enclosed) welding) welding, especially welded heat affecting zone does not have the welding cold crack to welding joint, tendency of hardenability is little is that maximum hardness is low, and has the good mechanical performance.
Before the application, Chinese patent application 200510047196.0 has been announced " high strength and low welding crack steel thick plate and production method thereof ", its chemical ingredients is by weight percentage: C:0.06%～0.09%, Si:0.15%～0.55%, Mn:1.00%～1.60%, P≤0.015%, S≤0.006%, Cu≤0.30%, Ni:0.15%～0.40%, Cr≤0.30%, Mo≤0.30%, V:0.02%～0.06%, Nb:0.005%～0.05%, Als:0.010%～0.040%, surplus are Fe and unavoidable impurities.Similarly, Chinese patent application 200510047195.6 has been introduced, and a kind of " thick steel plate with great line energy and low welding crack sensitivity and production method thereof " and Chinese patent application 200610018010.3 have been announced a kind of " low welding crack sensitivity steel plate and production method thereof ", form through controlled rolling, the cooling of online laminar flow and off-line tempering.Above-mentioned three patented technology deficiencies are complex chemical composition, contain alloying elements such as expensive Ni, Mo, and moulding process comprises the off-line tempering, have reduced production efficiency, have improved production cost.Another Chinese patent application 200710052132.9 discloses " a kind of soldering boat deck steel in high intensity by large line energy and manufacture method thereof ", its chemical ingredients is by weight percentage: C:0.01%～0.18%, Mn:1.0%～1.8%, Si:0.05%～0.40%, P＜0.015%, S＜0.010%, Nb:0.01%～0.08%, N:0.002%～0.012%, Ti:0.01%～0.08%, Als:0.001%～0.06%, B:0.0001%～0.0030%, or Ca or Mg or Zr be 0.0001%～0.030%, and surplus is Fe and unavoidable impurities, by smelting, roll back control insulation, online cooling forms.Its deficiency is that micro alloying element is too many, and is not easy to operate in the smelting process, restive its composition precision, and increased cost.Adopt in the forming process and roll back relaxation (insulation) technology, reduced plant factor and production efficiency, be difficult in actual production process, apply.
Summary of the invention
The present invention is directed to existing hull structural steel welding property, poor mechanical property, contain alloying elements such as expensive Ni, Mo in the chemical ingredients, and the shortcoming of complex manufacturing, a kind of hull structural steel and manufacture method thereof with excellent welding performance is provided, this steel welding property, mechanical property excellence, do not contain alloying elements such as Ni, Mo, production process is controlled easily, and is simple to operate.
A kind of hull structural steel of the present invention with excellent welding performance, the chemical ingredients that it is characterized in that described steel is by weight percentage: C 0.05～0.25%, Si 0.01～1.0%, Mn 0.50～2.0%, P≤0.020%, S≤0.010%, Ti 0.005～0.10%, Nb 0.005～0.10%, and surplus is Fe and unavoidable impurities, and chemical ingredients satisfies following relational expression:
(1)0.015％≤C×Si≤0.075％；
(2)0.095％≤C×Mn≤0.15％；
(3)0.0003％≤Nb×Ti≤0.0005％。
The production method of this steel may further comprise the steps: slab heating-roughing-finish rolling-water-cooled-air cooling, and its concrete parameter is controlled to be:
Start rolling temperature 〉=1000 ℃;
Finishing temperature: 800～900 ℃, rolling total draft 〉=80%;
Water after the finish to gauge and be chilled to 400～700 ℃;
Air cooling is to room temperature.
Selected each alloying element and composition range are based on following principle in the steel of the present invention:
Less expensive alloying element is C, Si, Mn etc. in the steel, micro alloying element has Nb, Ti etc., the technology of the present invention makes full use of the interaction between these cheap alloying elements, makes not only to have excellent mechanical performances but also have the hull structural steel that excellent processing performance is especially welded.Add alloying elements such as proper C, Mn and Si, can improve the intensity of steel on the one hand, make the yield strength of steel reach the 400MPa rank, tensile strength is 500～680MPa; On the other hand, appropriate stable austenite in moulding process and welding process of cooling suppresses austenite and becomes granular ferrite and perlite at high temperature transformation, and impelling wherein, temperature is transformed into the acicular ferrite structure with good over-all properties
C is one of gap strengthening element effective, the most most economical in the steel, in order to improve the intensity of steel, as if as long as the carbon content in the increase steel, but excessive C content can make the welding property of steel and toughness significantly reduce, on the contrary, if C content is low excessively, then be difficult to ensure the intensity of steel, the intensity of overall equilbrium steel, welding property and fracture toughness property are defined as the span of C content: 0.05～0.25%.
Si is a kind of displacement solution strengthening element of economy, china natural resources is very abundant, add the intensity that can significantly improve steel in the steel, and the welding property to steel does not have tangible negative impact, if but add Si too much, surpass 0.80% as content, can make the toughness of steel, low-temperature flexibility is obviously reduced, and the intensity of comprehensive steel and the consideration of toughness two aspects are defined as the composition range of Si: 0.01～1.0%.
Mn not only can increase the intensity of steel, can also reduce the transformation temperature of steel, by the controlled rolling process, crystal grain thinning improves its fracture toughness property simultaneously in the intensity that improves steel, surpasses 2.0% but work as Mn content, can increase the hardenability of steel, in the tissue of steel, form more martensitic stucture, reduce toughness and welding property, so the scope of Mn content is set at: 0.50～2.0%.
The Nb that adds trace in the steel, main purpose is to improve the recrystallization temperature of steel, make rolling can finishing at comparatively high temps, reduce the rolling drag of rolling mill equipment, increase the service life, the Nb of trace also has crystal grain thinning and improves intensity and flexible effect, but excessive N b content is unfavorable for the welding property of steel, therefore Nb content is defined as: 0.005～0.10%.
Remaining N in conjunction with the TiN that forms high-temperature stable mutually in Ti and the steel, the effective crystal grain of refinement welded heat affecting zone, improve the mechanical property of welding joint, therefore the welding property that micro-Ti and N content can improve steel, excessive Ti, N content reduce the toughness of steel consumingly, therefore Ti content in the steel are limited to 0.005～0.10% scope.
In addition, add the Ti of certain content in the steel, and residual 0 combine in the steel, form the Ti of high-temperature stable
2O
3, purpose is in smelting process, forms the oxide compound Ti that some amount and disperse distribute
2O
3Precipitated phase, these tiny precipitated phase particles help to improve the mechanical property of welding joint, improve the welding property of steel.0 content is mainly controlled in the refinery practice behind converter smelting in the steel, and 0 content can not be too high, otherwise can damage the impelling strength of steel, with this it is controlled at 0.0002～0.0030% horizontal extent.
P, S are deleterious impurity elements in the steel, reduce the toughness and the welding property of steel, content is low more good more, but if limit its content low excessively, can increase the production difficulty, improve production cost, reduce furnace life, therefore under the prerequisite that does not influence toughness and welding property, steel is got P, S content be each defined in≤0.020% and≤0.010% normal ranges.
The chemical ingredients of steel satisfies relational expression: 0.015%≤C * Si≤0.075%, purpose are the inversely proportional relation of component content of C and Si in the steel, and when promptly C got high value, relative low value was measured in the interpolation of Si.
Satisfy relational expression: 0.095%≤C * Mn≤0.15%, purpose are the inversely proportional relation of component content of C and Mn in the steel, and when promptly C got high value, relative low value was measured in the interpolation of Mn.Guaranteeing that sodium has under the prerequisite of excellent mechanical performances, reduce the content of alloying element as far as possible, one can reduce the production cost of steel, and its two carbon equivalent that can reduce steel makes steel have excellent welding property.
Satisfy relational expression: 0.0003%≤Nb * Ti≤0.0005%, purpose is to utilize the interaction of micro alloying element Nb and Ti, widen the welding scope of steel, not only can adopt common weldprocedure such as manual metal-arc welding etc., can also adopt advanced large-line energy input welding technique such as electro-gas (enclosed) welding etc., and the performance of welded heat affecting zone satisfies technical requirements.
The manufacture method of steel of the present invention, based on following principle:
Start rolling temperature is set 〉=1000 ℃,,, have some and second precipitate at austenite grain boundary and to separate out, in the operation of rolling, crack, cause waste product because will set lowly generally 1050～1100 ℃ of beginning roughing.On the other hand, reduce if start rolling temperature is crossed the low final rolling temperature that will cause, low excessively finishing temperature easily forms the thick especially crystal grain of part, makes the mechanical property of steel reduce.In the actual production, limit, generally the strand temperature can be heated to above 1300 ℃, therefore as long as set the start rolling temperature lower limit by save energy and equipment heating efficiency.
Owing to added an amount of alloy element Nb, the non-recrystallization temperature of steel is brought up to 950 ℃, rolling for roughing more than 950 ℃, rolling for finish rolling below 950 ℃, the roughing process is that recrystallize is rolling, total draft requires to be higher than 80% purpose and is broken thick crystal grain, eliminates as-cast structure, makes uniform crystal particles.Finishing temperature is limited to 800～900 ℃ of scopes, and purpose is in non-recrystallization temperature interval by heavy reduction rolling, improves and does not change austenitic free energy, and obtain acicular ferrite and carbide-free Bainite tissue, thinning microstructure as far as possible.Water-cooled to 400 after the finish to gauge～700 ℃, the small grains in the time of can keeping finish to gauge suppresses grain growth, obtains good comprehensive mechanical property.
The present invention has the following advantages:
1. chemical ingredients of the present invention is simple relatively, does not contain expensive alloying element Ni, Mo, V etc., and through roll forming, production process is operated easily, and cost is lower, efficient height, suitable scale production.
2. the mechanical property excellence of steel of the present invention, yield strength 〉=400MPa, tensile strength is 500～680Mpa ,-40 ℃ of Akv 〉=100J; The weave construction of steel is: acicular ferrite accounts for 70～90%, and granular ferrite+bainite accounts for 10～30%;
3. the welding property excellence of steel of the present invention, the weave construction of welded heat affecting zone (HAZ): acicular ferrite structure 〉=60%, tensile strength 〉=500MPa ,-40 ℃ of Akv 〉=70J, maximum hardness≤280Hv.
4. the present invention not only has good comprehensive mechanical property, and has a good welding property, be suitable for various weldprocedures such as manual metal-arc welding, union melt welding, electro-gas (enclosed) welding, electroslag welding, not preheating before the weldering, not thermal treatment of postwelding, welding joint have good performance, and postwelding all can not produce welding crack, tendency of hardenability is little, therefore is beneficial to and applies.
Description of drawings
Fig. 1 is steel typical case heterogeneous microstructure photo of the present invention;
Fig. 2 simulates welded heat affecting zone typical case heterogeneous microstructure photo for steel of the present invention at the 60kJ/cm heat input.
Embodiment
Target component by following weight percent control steel of the present invention: C 0.05～0.25%, Si0.01～1.0%, Mn 0.50～2.0%, P≤0.020%, S≤0.010%, Ti 0.005～0.10%, and Nb 0.005～0.10%, surplus is Fe and unavoidable impurities, and chemical ingredients satisfies following relational expression:
(1)0.015％≤C×Si≤0.075％；
(2)0.095％≤C×Mn≤0.15％；
(3)0.0003％≤Nb×Ti≤0.0005％。
At first, adopt common process production, pass through desulfurizing iron-converter smelting-furnace rear refining-be cast into the slab process successively, then, slab heating-roughing-finish rolling-water-cooled-air cooling, the parameter that needs to control especially be:
Start rolling temperature 〉=1000 ℃;
Finishing temperature: 800～900 ℃, rolling total draft 〉=80%;
Water after the finish to gauge and be chilled to 400～700 ℃;
Air cooling is to room temperature.
Embodiment 1
In accordance with the present production process, produce tapping 1, its chemical ingredients sees Table the steel 1 in 1, and the concrete parameter control of production method sees Table the steel 1 in 2, its mechanical property sees Table the steel 1 in 3, and its electro-gas (enclosed) welding postwelding heat affected zone mechanical property and fracture location see Table the steel 1 in 4.
Embodiment 2
In accordance with the present production process, produce tapping 2, its chemical ingredients sees Table the steel 2 in 1, and the concrete parameter control of production method sees Table the steel 2 in 2, its mechanical property sees Table the steel 2 in 3, and its electro-gas (enclosed) welding postwelding heat affected zone mechanical property and fracture location see Table the steel 2 in 4.
Embodiment 3
In accordance with the present production process, produce tapping 3, its chemical ingredients sees Table the steel 3 in 1, and the concrete parameter control of production method sees Table the steel 3 in 2, its mechanical property sees Table the steel 3 in 3, and its electro-gas (enclosed) welding postwelding heat affected zone mechanical property and fracture location see Table the steel 3 in 4.
Embodiment 4
In accordance with the present production process, produce tapping 4, its chemical ingredients sees Table the steel 4 in 1, and the concrete parameter control of production method sees Table the steel 4 in 2, its mechanical property sees Table the steel 4 in 3, and its electro-gas (enclosed) welding postwelding heat affected zone mechanical property and fracture location see Table the steel 4 in 4.
Embodiment 5
In accordance with the present production process, produce tapping 5, its chemical ingredients sees Table the steel 5 in 1, and the concrete parameter control of production method sees Table the steel 5 in 2, its mechanical property sees Table the steel 5 in 3, and its electro-gas (enclosed) welding postwelding heat affected zone mechanical property and fracture location see Table the steel 5 in 4.
Embodiment 6
In accordance with the present production process, produce tapping 6, its chemical ingredients sees Table the steel 6 in 1, and the concrete parameter control of production method sees Table the steel 6 in 2, its mechanical property sees Table the steel 6 in 3, and its electro-gas (enclosed) welding postwelding heat affected zone mechanical property and fracture location see Table the steel 6 in 4.
Embodiment 7
In accordance with the present production process, produce tapping 7, its chemical ingredients sees Table the steel 7 in 1, and the concrete parameter control of production method sees Table the steel 7 in 2, its mechanical property sees Table the steel 7 in 3, and its electro-gas (enclosed) welding postwelding heat affected zone mechanical property and fracture location see Table the steel 7 in 4.
In order better to show steel various aspects of performance of the present invention, 4 groups of compared steel are provided in the present embodiment.Its chemical ingredients sees Table 1.The concrete parameter control of production method sees Table 2.Its mechanical property sees Table 3.Wherein when carrying out welding test, implementation condition is: not preheating before the weldering, welding surroundings temperature are 26 ℃, and relative humidity is 95%, and postwelding is thermal treatment not.Its electro-gas (enclosed) welding postwelding heat affected zone mechanical property sees Table 4.
Table 1. embodiment of the invention and comparative steel chemical ingredients
The main technique condition of table 2. production embodiment of the invention steel and comparative steel
The mechanical property test result of table 3. embodiment of the invention and comparative steel
Table 4 embodiment of the invention steel electro-gas (enclosed) welding postwelding heat affected zone mechanical property and fracture location
| Steel numbering system | Tensile strength sigma b/MPa | -40 ℃ of summers are than impact absorbing energy/J | Welded heat affecting zone maximum hardness/H v | Fracture location |
| Steel 1 | 515 | 115 | 222 | Locate fracture for 16 millimeters beyond the weld seam |
| Steel 2 | 530 | 139 | 234 | Locate fracture for 25 millimeters beyond the weld seam |
| Steel 3 | 545 | 128 | 244 | Locate fracture for 14 millimeters beyond the weld seam |
| Steel 4 | 525 | 86 | 225 | Locate fracture for 15 millimeters beyond the weld seam |
| Steel 5 | 510 | 127 | 238 | Locate fracture for 17 millimeters beyond the weld seam |
| Steel 6 | 520 | 146 | 256 | Locate fracture for 6 millimeters beyond the weld seam |
| Steel 7 | 560 | 102 | 267 | Locate fracture for 12 millimeters beyond the weld seam |
Steel of the present invention as can be seen from Table 3 not only reaches requirement of strength, and has good low-temperature impact toughness, and welding joint all do not find crackle, shows that steel of the present invention has good welding property.The tension fracture position all is positioned at beyond the welding joint as can be seen from Table 4, and yield strength, tensile strength all reach requirement,-40 ℃ of Charpy impact test results show that the impact absorbing energy of welded heat affecting zone all is higher than 70J, shows that steel of the present invention has good welding property.The comparative steel mechanical performance index does not all reach requirement.
, mainly be made of acicular ferrite as can be seen for steel typical case heterogeneous microstructure of the present invention by accompanying drawing 1, wherein the weave construction of steel is: acicular ferrite accounts for 70～90%, and granular ferrite+bainite accounts for 10～30%.Accompanying drawing 2 is that steel of the present invention is simulated welded heat affecting zone typical case heterogeneous microstructure through the 60kJ/cm heat input, and as can be seen from the figure overwhelming majority tissue is made up of acicular ferrite.The weave construction of welded heat affecting zone (HAZ) wherein: acicular ferrite structure 〉=60%.Tensile strength 〉=500MPa ,-40 ℃ of Akv 〉=70J, maximum hardness≤280Hv is suitable for making the Lincoln weld, electro-gas (enclosed) welding of large ship process etc., and not preheating before the weldering, not thermal treatment of postwelding.
Above-mentioned is detailed description for most preferred embodiment processing step of the present invention; the researchist in the technology of the present invention field can do the change of form and content aspect unsubstantiality and not depart from the scope that institute of the present invention essence is protected according to above-mentioned step; therefore, the present invention is not limited to above-mentioned concrete embodiment.
Claims (6)
1. hull structural steel with excellent welding performance, the chemical ingredients that it is characterized in that described steel is by weight percentage: C 0.05～0.25%, Si 0.01～1.0%, Mn 0.50～2.0%, P≤0.020%, S≤0.010%, Ti 0.005～0.10%, Nb 0.005～0.10%, and surplus is Fe and unavoidable impurities, and chemical ingredients satisfies following relational expression:
(1)0.015％≤C×Si≤0.075％；
(2)0.095％≤C×Mn≤0.15％；
(3)0.0003％≤Nb×Ti≤0.0005％。
2. a kind of hull structural steel according to claim 1 with excellent welding performance, the chemical ingredients that it is characterized in that steel is by weight percentage for following a kind of, several or whole: C 0.07～0.10%, Si 0.22～0.70%, Mn 1.4～1.5%, P≤0.020%, S≤0.010%, Ti0.015～0.020%, Nb 0.021～0.024%, and surplus is Fe and unavoidable impurities.
3. a kind of hull structural steel according to claim 1 with excellent welding performance, the chemical ingredients that it is characterized in that steel is by weight percentage for following a kind of, several or whole: C 0.08～0.09%, Si 0.30～0.64%, Mn 1.42～1.49%, P≤0.020%, S≤0.010%, Ti0.018～0.019%, Nb 0.022～0.023%, and surplus is Fe and unavoidable impurities.
4. a claim 1,2 or 3 described production methods with hull structural steel of excellent welding performance is characterized in that may further comprise the steps: slab heating-roughing-finish rolling-water-cooled-air cooling, and concrete parameter is controlled to be:
Start rolling temperature 〉=1000 ℃;
Finishing temperature: 800～900 ℃, rolling total draft 〉=80%;
Water after the finish to gauge and be chilled to 400～700 ℃;
Air cooling is to room temperature.
5. according to claim
Described a kind of production method with hull structural steel of excellent welding performance is characterized in that start rolling temperature is 1050 ℃～1100 ℃.
6. according to claim
Described a kind of production method with hull structural steel of excellent welding performance is characterized in that rolling total draft 〉=90%.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812639A (en) * | 2010-04-20 | 2010-08-25 | 马鞍山钢铁股份有限公司 | Steel used for welding hull with high strength and high input energy and production method thereof |
| CN101906576B (en) * | 2009-06-03 | 2011-12-28 | 攀钢集团研究院有限公司 | Production method of hot continuous-milling steel plate |
| CN108977732A (en) * | 2018-08-10 | 2018-12-11 | 武汉钢铁集团鄂城钢铁有限责任公司 | Great surface quality and the heat bundle steel plate and its production method with good welds performance |
| WO2020030040A1 (en) * | 2018-08-08 | 2020-02-13 | Jiangsu Shagang Group Co., Ltd. | Production of twin-roll cast and hot rolled steel strip |
| CN112981250A (en) * | 2021-02-04 | 2021-06-18 | 湖南华菱涟源钢铁有限公司 | Control method for corner crack of low-carbon low-titanium niobium-containing steel sheet billet with low molten iron unit consumption |
| CN114892075A (en) * | 2022-04-25 | 2022-08-12 | 南京钢铁股份有限公司 | Low-temperature L-shaped steel and preparation method thereof |
| CN117604389A (en) * | 2023-12-09 | 2024-02-27 | 河北普阳钢铁有限公司 | Production method of 420 MPa-level low-alloy high-strength steel easy to weld |
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2008
- 2008-03-31 CN CNA2008100471983A patent/CN101250664A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101906576B (en) * | 2009-06-03 | 2011-12-28 | 攀钢集团研究院有限公司 | Production method of hot continuous-milling steel plate |
| CN101812639A (en) * | 2010-04-20 | 2010-08-25 | 马鞍山钢铁股份有限公司 | Steel used for welding hull with high strength and high input energy and production method thereof |
| WO2020030040A1 (en) * | 2018-08-08 | 2020-02-13 | Jiangsu Shagang Group Co., Ltd. | Production of twin-roll cast and hot rolled steel strip |
| CN108977732A (en) * | 2018-08-10 | 2018-12-11 | 武汉钢铁集团鄂城钢铁有限责任公司 | Great surface quality and the heat bundle steel plate and its production method with good welds performance |
| CN108977732B (en) * | 2018-08-10 | 2020-05-05 | 武汉钢铁集团鄂城钢铁有限责任公司 | Hot-rolled steel plate with high surface quality and good welding performance and production method thereof |
| CN112981250A (en) * | 2021-02-04 | 2021-06-18 | 湖南华菱涟源钢铁有限公司 | Control method for corner crack of low-carbon low-titanium niobium-containing steel sheet billet with low molten iron unit consumption |
| CN114892075A (en) * | 2022-04-25 | 2022-08-12 | 南京钢铁股份有限公司 | Low-temperature L-shaped steel and preparation method thereof |
| CN117604389A (en) * | 2023-12-09 | 2024-02-27 | 河北普阳钢铁有限公司 | Production method of 420 MPa-level low-alloy high-strength steel easy to weld |
| CN117604389B (en) * | 2023-12-09 | 2024-04-30 | 河北普阳钢铁有限公司 | Production method of 420 MPa-level low-alloy high-strength steel easy to weld |
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