CN105734419A - V and Ti micro-alloy steel and smelting method and application thereof - Google Patents
V and Ti micro-alloy steel and smelting method and application thereof Download PDFInfo
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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
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C22C38/08—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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
Abstract
The invention belongs to the field of steel smelting, and particularly relates to V and Ti micro-alloy steel and a smelting method and application thereof. In the prior art, during steelmaking, most of metal deoxygenation materials are selected as deoxygenation materials, and the deoxygenation cost is high. The smelting method capable of reducing the steelmaking cost comprises the step of converter steelmaking, the step of small platform furnace external treatment and the step of continuous casting. In the stage of converter steelmaking, a new deoxygenation alloying technology is adopted, in the stage of small platform furnace external treatment, the output oxide activity of a small platform is controlled to be smaller than or equal to 50 ppm, and accordingly the V and Ti micro-alloy steel is produced. According to the V and Ti micro-alloy steel and the smelting method and application thereof, the usage amount of the metal deoxygenation materials is reduced, meanwhile, a V micro-alloy and a Ti micro-alloy are introduced, the adding amount of silicon and manganese is reduced, cost is saved, and steelmaking can meet the requirement for performance of building steel.
Description
Technical field
The invention belongs to field of iron and steel smelting, particularly to a kind of V, Ti micro alloyed steel and smelting process thereof and purposes.
Background technology
Straight carbon steel is the steel grade that China's steel and iron industry is main, plays an important role in the national economic development.According to statistics, straight carbon steel steel plate ratio in sheet material is more than 70%.Construction(al)steel belongs to the one in straight carbon steel, generally that the intensity of steel plate, toughness, plasticity requirements is not high, only need to meet the mechanical property in general straight carbon steel GB GB/T700-2006 standard-required, yield strength >=235Mpa；Tensile strength 370-500Mpa；Elongation after fracture >=26%.
The domestic commercial production to Q235 low-alloy high-tensile structural steel and products application aspect have some achievements in research.As document " Wu Haohong. ripples steel CSP line Q235B thin plate performance and cost optimization [J]. metal material and metallurgical engineering, 2010, 06, 34～38. ", according to self-condition, the chemical composition of Q235 low-alloy high-tensile structural steel is adjusted, the main element M n content to controlling hardness of steel adjusts to 0.28～0.38%, end properties fully meets GB and user's needs, wine steel, in its Q235 low-alloy high-tensile structural steel such as Wuhan Iron and Steel Plant, Mn content is generally more than 0.35%, each enterprise meets standard-required for the intensity ensureing Q235 low-alloy high-strength structural hot rolled steel plate, main alloy element Mn content substantially controls the higher level more than 0.35%, cause that production cost is higher.
Prior art STEELMAKING PRODUCTION cost is high, how to reduce the mechanical property reaching to need that makes to be made steel on hardness of steel big Si, Mn content of impact, has critically important realistic meaning to saving production cost.
Summary of the invention
For above-mentioned prior art Problems existing, the goal of the invention of the present invention is in that to provide a kind of V, Ti micro alloyed steel and smelting process thereof and purposes, the method can be produced to have and climb the vanadium of steel characteristic, titanium micro-alloyed steel, by adding vanadium iron, ferrotianium provides V, Ti microalloy, thus reducing silicon, Fe content, meeting on the GB basis to mechanical property requirements, greatly reduce steel-making cost, there is good economic benefit.
First technical problem that the invention solves the problems that is to provide a kind of V, Ti micro alloyed steel, its composition is: by weight percentage, C:0.20～0.25, Si:0.03～0.08, Mn:0.10～0.15, P:0～0.035, S:0～0.035, V:0.01～0.05%, Ti:0.01～0.05%, Cr:0～0.03%, Ni:0～0.03%, surplus is Fe and inevitable impurity.
Wherein, above-mentioned V, Ti micro alloyed steel, preferred composition is: its composition is: by weight percentage C:0.21～0.24, Si:0.04～0.07, Mn:0.11～0.14, P:0～0.025, S:0～0.025, V:0.02～0.04%, Ti:0.02～0.04%, Cr:0～0.02%, Ni:0～0.02%, surplus is Fe and inevitable impurity.
Wherein, above-mentioned V, Ti micro alloyed steel, prepared by following smelting process, processing and continuous casting step including outside pneumatic steelmaking, chain-wales stove, the deoxidation alloying process in described pneumatic steelmaking stage is: during converter smelting molten steel endpoint carbon content≤0.04%, is initially charged carbon dust when molten steel is paved with ladle pot bottom, carburant carries out pre-deoxidation, when weight of tapping accounts for the 1/3～1/2 of gross weight, sequentially add carburant, double deoxidizer and silicomangan, after tapping terminates, add vanadium iron, ferrotianium；During converter smelting molten steel endpoint carbon content > 0.04%, it is directly added into carburant, double deoxidizer and silicomangan when weight of tapping accounts for the 1/3～1/2 of gross weight, after tapping terminates, adds vanadium iron, ferrotianium；Chain-wales departures oxygen activity≤50ppm is controlled the processing stage that described chain-wales stove being outer.
Second technical problem that the invention solves the problems that is to provide the smelting process of a kind of V, Ti micro alloyed steel, processes and continuous casting step including outside pneumatic steelmaking, chain-wales stove；
The deoxidation alloying process in described pneumatic steelmaking stage is: during converter smelting molten steel endpoint carbon content≤0.04%, be initially charged carbon dust when molten steel is paved with ladle pot bottom, carburant carries out pre-deoxidation, when weight of tapping accounts for the 1/3～1/2 of gross weight, sequentially add carburant, double deoxidizer and silicomangan, after tapping terminates, add vanadium iron, ferrotianium；During converter smelting molten steel endpoint carbon content > 0.04%, it is directly added into carburant, double deoxidizer and silicomangan when weight of tapping accounts for the 1/3～1/2 of gross weight, after tapping terminates, adds vanadium iron, ferrotianium；
Chain-wales departures oxygen activity≤50ppm is controlled the processing stage that described chain-wales stove being outer.
Wherein, in the smelting process of above-mentioned V, Ti micro alloyed steel, described carbon dust addition is 0.15～0.30kg/t steel.
Wherein, in the smelting process of above-mentioned V, Ti micro alloyed steel, the addition of described carburant is: during carbon content≤0.04, and first time adds carburant 0.2～0.5kg/t steel, and second time adds carburant 2.1～2.8kg/t steel；During carbon content > 0.04%, add carburant 2.2～2.6kg/t steel.
Wherein, in the smelting process of above-mentioned V, Ti micro alloyed steel, described double deoxidizer is CaC260～65wt%, Si28～34wt% double deoxidizer, addition is 1.4～1.6kg/t steel.
Wherein, in the deoxidation alloying method of above-mentioned V, Ti micro alloyed steel, described double deoxidizer granularity is 15～20mm.
Wherein, in the smelting process of above-mentioned V, Ti micro alloyed steel, described silicomangan is the silicomangan of Mn:60.0～67.0wt%, Si:14.0～17.0wt%, and addition is 2.1～2.4kg/t steel.
Wherein, in the smelting process of above-mentioned V, Ti micro alloyed steel, described vanadium iron addition is 0.7～0.95kg/t steel, and described vanadium iron is V content is the vanadium iron of 50%.
Wherein, in the smelting process of above-mentioned V, Ti micro alloyed steel, described ferrotianium addition is 1.2～1.45kg/t steel, and described ferrotianium is Ti content is the ferrotianium of 30%.
The 3rd technical problem that the invention solves the problems that is to provide the purposes of a kind of above-mentioned V, Ti micro alloyed steel, for building industry and Guan Ye.
The invention have the benefit that the present invention provides a kind of V, Ti micro alloyed steel and deoxidation alloying method thereof and purposes, the method adopts the deoxidized alloying in steel making technique of low cost, carbon dust is used first to carry out pre-deoxidation, what decrease deoxidizing metals material makes consumption, it also avoid the pollution to molten steel of the deoxidizing metals product；Simultaneously, add vanadium iron after deoxidation, ferrotianium carries out Alloying Treatment, the addition of V, Ti microalloy decreases the addition of silicon, manganese, greatly reduce the cost of steel-making, the vanadium of steel characteristic, titanium micro-alloyed steel is climbed thus producing to have, reducing while cost, made steel the mechanical property requirements fully met in GB GB/T700-2006 standard, be primarily useful for building industry and Guan Ye.
Detailed description of the invention
The present invention provides a kind of V, Ti micro alloyed steel, its composition is: by weight percentage, C:0.20～0.25, Si:0.03～0.08, Mn:0.10～0.15, P:0～0.035, S:0～0.035, V:0.01～0.05%, Ti:0.01～0.05%, Cr:0～0.03%, Ni:0～0.03%, surplus is Fe and inevitable impurity.
Wherein, above-mentioned V, Ti micro alloyed steel, preferred composition is: its composition is: by weight percentage C:0.21～0.24, Si:0.04～0.07, Mn:0.11～0.14, P:0～0.025, S:0～0.025, V:0.02～0.04%, Ti:0.02～0.04%, Cr:0～0.02%, Ni:0～0.02%, surplus is Fe and inevitable impurity.
Wherein, above-mentioned V, Ti micro alloyed steel, prepared by following smelting process, processing and continuous casting step including outside pneumatic steelmaking, chain-wales stove, the deoxidation alloying process in described pneumatic steelmaking stage is: during converter smelting molten steel endpoint carbon content≤0.04%, is initially charged carbon dust when molten steel is paved with ladle pot bottom, carburant carries out pre-deoxidation, when weight of tapping accounts for the 1/3～1/2 of gross weight, sequentially add carburant, double deoxidizer and silicomangan, after tapping terminates, add vanadium iron, ferrotianium；During converter smelting molten steel endpoint carbon content > 0.04%, it is directly added into carburant, double deoxidizer and silicomangan when weight of tapping accounts for the 1/3～1/2 of gross weight, after tapping terminates, adds vanadium iron, ferrotianium；Chain-wales departures oxygen activity≤50ppm is controlled the processing stage that described chain-wales stove being outer.
The present invention also provides for the smelting process of a kind of V, Ti micro alloyed steel, processes and continuous casting step including outside pneumatic steelmaking, chain-wales stove；
The deoxidation alloying process in described pneumatic steelmaking stage is: during converter smelting molten steel endpoint carbon content≤0.04%, be initially charged carbon dust when molten steel is paved with ladle pot bottom, carburant carries out pre-deoxidation, when weight of tapping accounts for the 1/3～1/2 of gross weight, sequentially add carburant, double deoxidizer and silicomangan, after tapping terminates, add vanadium iron, ferrotianium；During converter smelting molten steel endpoint carbon content > 0.04%, it is directly added into carburant, double deoxidizer and silicomangan when weight of tapping accounts for the 1/3～1/2 of gross weight, after tapping terminates, adds vanadium iron, ferrotianium；
Chain-wales departures oxygen activity≤50ppm is controlled the processing stage that described chain-wales stove being outer.
Wherein, in order to reach pre-deoxidation effect, when converter smelting molten steel endpoint carbon content≤0.04% is initially charged 0.15～0.30kg/t steel carbon dust, namely carbon dust is powdered ink, is made up of resin and white carbon black, electric charge agent, magnetic powder etc..The present invention adopts this nonmetal deoxidation material of carbon dust to carry out deoxidation, the consumption of deoxidizing metals material can be significantly reduced, the deoxidation effectiveness of carbon dust and the deoxidation effectiveness of fine aluminium can convert by 11, by promoting the use of converter carbon deoxidization technique, straight carbon steel smelting process is produced relative to original, both decrease the consumption of deoxidizing metals material, decrease again the pollution to molten steel of the deoxidizing metals product.
In order to adjust smelting endpoint molten steel carbon content, when converter smelting molten steel endpoint carbon content≤0.04%, will adding twice carburant, first time adds the carbon deoxidation mainly playing carburant, and second time is added to carburetting.As converter smelting molten steel endpoint carbon content > 0.04%, can being directly added into a carburant, now carburant is mainly used in the converter carburetting steel grade claimed range to C:0.20～0.25%.Wherein, when the addition of carburant is respectively as follows: carbon content≤0.04, first time adds carburant 0.2～0.5kg/t steel, and second time adds carburant 2.1～2.8kg/t steel；During carbon content > 0.04%, add carburant 2.2～2.6kg/t steel.
In order to better carry out deoxidation, save cost, the present invention is simultaneously introduced double deoxidizer and carries out deoxidation, reduces the consumption of deoxidizing metals material, reduces the quantity of field trash and reduces production cost；In the present invention, preferred double deoxidizer consists of: CaC260～65wt%, Si28～34wt%, surplus Fe, addition is 1.4～1.6kg/t steel.Meanwhile, the granule size of deoxidizer will have influence on deoxidation effect, be limited within the scope of 15～20mm by the granularity of deoxidizer in the present invention, can effectively ensure deoxidation effect.
In order to obtain the steel of high intensity, need to add appropriate silicomangan, owing to the later stage adds vanadium iron, ferrotianium in the present invention, be effectively reduced the addition of silicomangan, preferred silicomangan addition is 2.1～2.4kg/t steel, described silicomangan consists of: by weight percentage, Mn:60.0～67.0%, Si:14.0～17.0%, C :≤2.5%, P :≤0.2%, S :≤0.2%, surplus is Fe.
Especially, the present invention adds vanadium iron, ferrotianium steel-making, and vanadium iron addition is 0.7～0.95kg/t steel, it is preferable that V content is the vanadium iron of 50%, but is not limited to be limited within the scope of this by V content, adjusts the addition of vanadium iron according to the difference of V content；Ferrotianium addition is 1.2～1.45kg/t steel, it is preferable that Ti content is the ferrotianium of 30%, but is not limited to be limited within the scope of this by Ti content, adjusts the addition of ferrotianium according to the difference of Ti content.
Namely continuous casting is continuous casting, and when being steel-making, molten steel is constantly by water mold, pulls straight from crystallizer lower exit port after the duricrust that congeals into, and through water-spraying control, is all cut into the foundry technology process of blank after solidification.In the smelting process of the present invention, continuous casting adopts conventional continuous cast method to carry out.
Below in conjunction with embodiment, technical solution of the present invention is described further, but does not indicate that and protection domain is limited in scope of embodiments.
In embodiment, product used is common commercially available prod.
Embodiment 1
120t pneumatic steelmaking, tap 133t.Smelting molten steel endpoint carbon content is 0.03%, tapping process is paved with ladle pot bottom at molten steel and is namely initially charged 0.20kg/t steel carbon dust and 0.3kg/t steel carburant carries out pre-deoxidation, after carbon in ladle-oxygen reaction tends to calmness (about tapping 1/3～1/2), carburant, double deoxidizer and SiMn alloy is added according still further to order, wherein carburant adds 2.6kg/t steel, double deoxidizer adds 1.5kg/t steel, and silicomanganese is quantitatively adding 2.2kg/t steel.Chain-wales departures oxygen activity 30ppm, FeTi30-A addition 1.36kg/t steel, FeV50-A addition 0.83kg/t steel.Continuous casting is carried out after chain-wales departures, composition of steel after finally becoming a useful person: C:0.23, Si:0.06, Mn:0.13, P:0.025, S:0.015, V:0.03%, Ti:0.03%, Cr:0.015%, Ni:0.015%, surplus are Fe and inevitable impurity.
Final performance: yield strength: 337MPa, tensile strength: 427MPa, elongation after fracture: 36%.Produced V, Ti micro alloyed steel fully meets GB and user's instructions for use.
Embodiment 2
120t pneumatic steelmaking, tap 135t.Smelting molten steel endpoint carbon content is 0.07%, tapping process (about tapping 1/3～1/2) after carbon in ladle-oxygen reaction tends to calmness adds carburant, double deoxidizer and SiMn alloy in order, wherein carburant is accumulative adds 2.45kg/t steel, double deoxidizer adds 1.4kg/t steel, and silicomanganese is quantitatively adding 2.1kg/t steel.Chain-wales departures oxygen activity 28ppm, FeTi30-A addition 1.25kg/t steel, FeV50-A addition 0.75kg/t steel.Continuous casting is carried out after chain-wales departures, composition of steel after finally becoming a useful person: C:0.21, Si:0.045, Mn:0.13, P:0.020, S:0.014, V:0.02%, Ti:0.02%, Cr:0.014%, Ni:0.021%, surplus are Fe and inevitable impurity.
Final performance: yield strength: 341MPa, tensile strength: 432MPa, elongation after fracture: 40%.Produced V, Ti micro alloyed steel fully meets GB and user's instructions for use.
Embodiment 3
120t pneumatic steelmaking, tap 134t.Smelting molten steel endpoint carbon content is 0.06%, tapping process (about tapping 1/3～1/2) after carbon in ladle-oxygen reaction tends to calmness adds carburant, double deoxidizer and SiMn alloy in order, wherein carburant is accumulative adds 2.6kg/t steel, double deoxidizer adds 1.6kg/t steel, and silicomanganese is quantitatively adding 2.35kg/t steel.Chain-wales departures oxygen activity 34ppm, FeTi30-A addition 1.4kg/t steel, FeV50-A addition 0.9kg/t steel.Continuous casting is carried out after chain-wales departures, composition of steel after finally becoming a useful person: C:0.23, Si:0.08, Mn:0.14, P:0.019, S:0.012, V:0.035%, Ti:0.035%, Cr:0.016%, Ni:0.028%, surplus are Fe and inevitable impurity.
Final performance: yield strength: 326MPa, tensile strength: 441MPa, elongation after fracture: 42%.Produced V, Ti micro alloyed steel fully meets GB and user's instructions for use.
From embodiment: the present invention utilizes vanadium iron, ferrotianium to provide V, Ti microalloy, V, Ti of adding trace in molten steel will form part TiC, VC, rolling and cooling procedure precipitate out small and dispersed particle, small and dispersed TiC, VC can effectively stop the motion of dislocation, play strong precipitation strength effect.The vanadium of trace, titanium can make up the impact being reduced the intensity brought by Fe content, common straightcarbon steel is made to maintain good mechanical property by the schedule of reinforcement of vanadium titanium microalloying, both the intensity of steel had been added, save again the addition of silicomangan, thus reducing production cost, the micro alloyed steel produced meets the requirement of GB GB/T700-2006 in mechanical property, is primarily useful on building industry and Guan Ye.
Claims (10)
1. V, Ti micro alloyed steel, its composition is: by weight percentage, C:0.20～0.25, Si:0.03～0.08, Mn:0.10～0.15, P:0～0.035, S:0～0.035, V:0.01～0.05%, Ti:0.01～0.05%, Cr:0～0.03%, Ni:0～0.03%, surplus is Fe and inevitable impurity.
2. V, Ti micro alloyed steel according to claim 1, it is characterized in that: its composition is: by weight percentage C:0.21～0.24, Si:0.04～0.07, Mn:0.11～0.14, P:0～0.025, S:0～0.025, V:0.02～0.04%, Ti:0.02～0.04%, Cr:0～0.02%, Ni:0～0.02%, surplus is Fe and inevitable impurity.
3. a smelting process for V, Ti micro alloyed steel, processes and continuous casting step including outside pneumatic steelmaking, chain-wales stove, it is characterised in that:
The deoxidation alloying process in described pneumatic steelmaking stage is: during converter smelting molten steel endpoint carbon content≤0.04%, be initially charged carbon dust when molten steel is paved with ladle pot bottom, carburant carries out pre-deoxidation, when weight of tapping accounts for the 1/3～1/2 of gross weight, sequentially add carburant, double deoxidizer and silicomangan, after tapping terminates, add vanadium iron, ferrotianium；During converter smelting molten steel endpoint carbon content > 0.04%, it is directly added into carburant, double deoxidizer and silicomangan when weight of tapping accounts for the 1/3～1/2 of gross weight, after tapping terminates, adds vanadium iron, ferrotianium；
Chain-wales departures oxygen activity≤50ppm is controlled the processing stage that described chain-wales stove being outer.
4. the smelting process of V, Ti micro alloyed steel according to claim 3, it is characterised in that: described carbon dust addition is 0.15～0.30kg/t steel.
5. the smelting process of V, Ti micro alloyed steel according to claim 3 or 4, it is characterised in that: the addition of described carburant is: during carbon content≤0.04, and first time adds carburant 0.2～0.5kg/t steel, and second time adds carburant 2.1～2.8kg/t steel；During carbon content > 0.04%, add carburant 2.2～2.6kg/t steel.
6. the smelting process of V, Ti micro alloyed steel according to any one of claim 3～5, it is characterised in that: described double deoxidizer is CaC260～65wt%, Si28～34wt% double deoxidizer, addition is 1.4～1.6kg/t steel.
7. the smelting process of V, Ti micro alloyed steel according to any one of claim 3～6, it is characterised in that: described silicomangan is the silicomangan of Mn:60.0～67.0wt%, Si:14.0～17.0wt%, and addition is 2.1～2.4kg/t steel.
8. the smelting process of V, Ti micro alloyed steel according to any one of claim 3～7, it is characterised in that: described vanadium iron is V content is the vanadium iron of 50%, and addition is 0.7～0.95kg/t steel.
9. the smelting process of V, Ti micro alloyed steel according to any one of claim 3～8, it is characterised in that: described ferrotianium is Ti content is the ferrotianium of 30%, and addition is 1.2～1.45kg/t steel.
10. the purposes of V, Ti micro alloyed steel, it is characterised in that: for building industry and Guan Ye.
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| JPH05148576A (en) * | 1991-11-27 | 1993-06-15 | Aichi Steel Works Ltd | Steel for bolt excellent in delayed breakdown characteristic |
| EP1375683A1 (en) * | 2001-03-29 | 2004-01-02 | Sumitomo Metal Industries, Ltd. | High strength steel tube for air bag and method for production thereof |
| CN103290164A (en) * | 2013-06-28 | 2013-09-11 | 攀钢集团攀枝花钢钒有限公司 | Non-vacuum deaeration method for converter steel making |
| CN104928580A (en) * | 2015-07-10 | 2015-09-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-Mn hot rolled steel and preparation method thereof |
| CN105200317A (en) * | 2015-09-23 | 2015-12-30 | 舞阳钢铁有限责任公司 | Control-rolled Ti-containing type low alloy steel plate at the grade of 345 Mpa and production method of control-rolled Ti-containing type low alloy steel plate |
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