CN104862588A - Hot-rolled H-shaped profile steel and production method thereof - Google Patents
Hot-rolled H-shaped profile steel and production method thereof Download PDFInfo
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Abstract
The invention relates to hot-rolled H-shaped profile steel and a production method thereof. The profile steel comprises the following chemical components in percentage by weight: 0.07%-0.15% of carbon, 0.15%-0.35% of silicon, 1.00%-1.45% of manganese, not greater than 0.020% of phosphorus, not greater than 0.015% of sulphur, 0.020%-0.060% of vanadium, 0.010%-0.060% of niobium and not smaller than 0.015% of Als; the production method comprises the following steps: smelting in a converter; blowing an argon station; carrying out LF (low-frequency) refining; casting; rolling. According to H-shaped profile steel with the specification of 428*407*20*35 produced by a production method of low-temperature ductile hot-rolled H-shaped profile steel of minus 50 DEG C, the low-temperature ductility at minus 50 DEG C exceeds 167J; the low-temperature ductile hot-rolled H-shaped profile steel has extremely low ductile-to-brittle transition temperature and good low-temperature ductility; the product quality is improved.
Description
Technical field
The present invention relates to metallic substance production technical field, be specifically related to a kind of hot rolled H-shaped and production method.
Background technology
In recent years, the exploitation of the energy is shifted from envrionment conditions Production Zones Suitable to the arctic areas of awful weather, because Arctic region is the severe extremely frigid zones of weather condition, make must have high low temperature tolerance characteristics at the oil-gas mining device of the high and cold regional Constructions such as the arctic or use, the iron structure material used under the severe cold condition less than-50 DEG C, must have the low-temperature impact toughness requirement of excellence.And according to the H profile steel that the general H profile steel technological process of production is produced, its tough ductile-brittle transition temperature is at about-10 DEG C, as for extremely frigid zones and low temperature environment, then when bearing dynamic load or impacting, easily there is brittle failure, cause unnecessary loss, for the H profile steel of-50 DEG C and following environment, its low-temperature impact work must be greater than 27J; And be raw material with Hot Metal in Beam Blank, what adopt the measures such as hot metal pretreatment, the large pressure of low temperature and cooling control after rolling to produce is hot rolled H-shaped, and-50 DEG C of low-temperature flexibilities etc. can meet-50 DEG C of impact property requirements.Meanwhile, adopting H profile steel to substitute welded H section steel can reduce welding sequence, improves job schedule, material use efficiency and security.
Chinese invention patent: patent No. 200410020627.X, H profile steel rolls rear controlled cooling model method.Although adopt the aerosol type of cooling to cool in refrigerating unit to the H profile steel after rolling in production process, utilize phase transformation strengthening, precipitation strength and refined crystalline strengthening mechanism, obtain the H profile steel structural state with small grains, but mainly to improve the intensity of H profile steel, low-temperature flexibility aspect is not related to.
Chinese invention patent: open (bulletin) number CN102051525A, a kind of production method of steel plate used for Q 420 qE bridge at low cost.This patent, mainly based on continuously cast bloom, by rational controlled rolling and Controlled cooling process process, produces the thick Q420qE steel plate of 10-40mm.But the object of this patent is the steel plate that continuous casting steel billet is produced, and has larger difference, and relate generally to-40 DEG C of low-temperature impact requirements with the H profile steel of producing with Hot Metal in Beam Blank in technique.
Chinese invention patent: open (bulletin) number-CN104018073A, a kind of low temperature resistant toughness H profile steel and production technique thereof.Disclose a kind of low temperature resistant toughness H profile steel, its chemical composition mass percentage is: carbon 0.08 ~ 0.13%, silicon 0.15 ~ 0.35%, manganese 1.25 ~ 1.45%, phosphorus≤0.01%, sulphur≤0.01%, niobium 0.03 ~ 0.05%, and surplus is iron and impurity element.Its rolling technological parameter is: Heating temperature 1230 ~ 1250 DEG C, breaking down start rolling temperature 1050 ~ 1150 DEG C, finish rolling start rolling temperature 940 ~ 950 DEG C, finish rolling finishing temperature 780 DEG C ~ 850 DEG C; Process for cooling parameter is: rolled piece is cooled to 580 ~ 680 DEG C of interval phase transformations with 50 ~ 100 DEG C/s speed of cooling, then rises again to 700 ~ 750 DEG C, and last H profile steel naturally cools to room temperature.Enable H profile steel under-40 DEG C and following temperature extremely frigid zones and low temperature environment, there is extremely low ductile-brittle transition temperature, good low-temperature impact resistance.This patent is Nb-microalloying scheme, and cooling scheme is Water cooling.
Chinese invention patent: open (bulletin) number-CN104018074A, a kind of low temperature resistant H profile steel and production technique thereof.Disclose a kind of low temperature resistant H profile steel, its chemical composition mass percentage is: carbon 0.08 ~ 0.13%, silicon 0.15 ~ 0.35%, manganese 1.25 ~ 1.45%, phosphorus≤0.01%, sulphur≤0.01%, vanadium 0.02 ~ 0.05%, and surplus is iron and impurity element.Its rolling technological parameter is: Heating temperature 1220 ~ 1240 DEG C, breaking down start rolling temperature 1050 ~ 1150 DEG C, finish rolling start rolling temperature 930 ~ 950 DEG C, finish rolling finishing temperature 780 DEG C ~ 900 DEG C; Process for cooling parameter is: rolled piece is cooled to 550 ~ 650 DEG C of interval phase transformations with 100 ~ 150 DEG C/s speed of cooling, then rises again to 700 ~ 750 DEG C, and last H profile steel naturally cools to room temperature.Enable H profile steel under-40 DEG C and following temperature extremely frigid zones and low temperature environment, there is extremely low ductile-brittle transition temperature, good low-temperature impact resistance.This patent is vanadium micro-alloying scheme, and roller repairing scheme is Water cooling, and low-temperature impact temperature is-40 DEG C.
Chinese invention patent: open (bulletin) number-CN103938079A, the hot rolled H-shaped and production method of low compression ratio ultra thick gauge low-temperature type.Disclose the hot rolled H-shaped and production method of a kind of low compression ratio ultra thick gauge low-temperature type belonging to hot rolled H-shaped field.This H profile steel is made up of following chemical composition by weight percentage: C 0.11 ~ 0.19%, Si 0.15 ~ 0.30%, Mn 1.30 ~ 1.55%, P≤0.02%, S≤0.008%, Ti 0.008 ~ 0.020%, V 0.015 ~ 0.055%, all the other are Fe and inevitable impurity.The production method of this H profile steel comprises converter or electrosmelting, LF refining, Hot Metal in Beam Blank full guard continuous casting, heating, rolling and refrigerating work procedure successively; finally obtain the thick good Low Temperature Hot Rolling H profile steel of surface quality being less than 3 for more than 30mm, compression ratio in the edge of a wing;-20 DEG C of longitudinal average impact merits are more than 150J, and it has wide market application foreground.This patent low-temperature impact temperature is-20 DEG C.
Chinese invention patent: open (bulletin) number-CN103966507A, the special thick low temperature resistant hot rolled H-shaped and production method of a kind of yield strength 275MPa level.Disclose a kind of yield strength 275MPa level spy thick (26mm≤edge of a wing thickness≤35mm) low temperature resistant hot rolled H-shaped and production method.Yield strength 275MPa level of the present invention is special thick low temperature resistant hot rolled H-shaped, its chemical composition is by weight percentage: C:0.12% ~ 0.17%, Si:0.10% ~ 0.30%, Mn:0.90% ~ 1.40%, P≤0.02%, S≤0.015%, V:0.01 ~ 0.03%, Ti:0.005 ~ 0.020%, all the other are iron and inevitable impurity.The special thick low temperature resistant hot rolled H-shaped mechanical property of yield strength 275MPa rank provided by the invention and-20 DEG C of impact of collision functions meet the special thick low temperature resistant hot rolled H-shaped technical requirements of 275MPa rank enough completely.This patent low-temperature impact temperature is-20 DEG C.
Chinese invention patent: open (bulletin) number-CN103834860A, a kind of 235MPa level is low temperature resistant hot rolled H-shaped and preparation method thereof.Disclose a kind of 235MPa level low temperature resistant hot rolled H-shaped and preparation method thereof, the weight percentage of the low temperature resistant hot rolled H-shaped chemical composition of described 235MPa level is: C 0.08 ~ 0.16%, Si 0.10 ~ 0.30%, Mn 0.65 ~ 1.20%, P≤0.025%, S≤0.025%, Nb 0.015 ~ 0.035%, Ti 0.005 ~ 0.030%, and all the other are iron and trace impurity.The present invention is mainly through reducing carbon and manganese content, application niobium titanium-combined microalloying technique, achieve the low temperature resistant hot rolled H-shaped products production of 235MPa level under high finishing temperature condition, produce the low temperature resistant hot rolled H-shaped good mechanical properties obtained ,-20 DEG C of impact of collision merits are greater than 206J.This patent low-temperature impact temperature is-20 DEG C.
Chinese invention patent: open (bulletin) number-CN103834861A, a kind of 320MPa level is low temperature resistant hot rolled H-shaped and preparation method thereof.Disclose a kind of 320MPa level low temperature resistant hot rolled H-shaped and preparation method thereof, the weight percentage of the low temperature resistant hot rolled H-shaped chemical composition of described 320MPa level is: C 0.05 ~ 0.11%, Si 0.20 ~ 0.35%, Mn 1.05 ~ 1.30%, P≤0.020%, S≤0.015%, Nb 0.020 ~ 0.035%, Ti 0.005 ~ 0.025%, and all the other are iron and trace impurity.The present invention is mainly through low carbon content, and application niobium titanium-combined microalloying technique, achieve the low temperature resistant hot rolled H-shaped products production of 320MPa level under high finishing temperature condition, the low temperature resistant steel mechanical property prepared is good, and-30 DEG C of impact of collision merits are greater than 165J.This patent low-temperature impact temperature is-30 DEG C.
Chinese invention patent: open (bulletin) number-CN103540844A, low temperature resistant H profile steel and production method thereof.Disclose a kind of low temperature resistant H profile steel and production method thereof.This H profile steel is made up of following chemical composition by weight percentage, C:0.05 ~ 0.11%, Si:0.25 ~ 0.50%, Mn:1.40 ~ 1.60%, P≤0.020%, S≤0.010%, Nb:0.025 ~ 0.035%, Ti:0.015 ~ 0.030%, Alt:0.015 ~ 0.030%, all the other are iron and inevitable impurity.Its production method comprises molten iron pre-desulfurization step, converter smelting step, LF refinement step, billet caster continuous casting step and milling step.Summer formula v-notch shock test is adopted to measure the low temperature resistant mechanical property of H profile steel ,-20 DEG C of striking energy >=144 joule ,-45 DEG C of striking energy >=98 joule.This patent low-temperature impact temperature is-45 DEG C, is Nb-microalloying scheme.
Chinese invention patent: open (bulletin) number-CN103484765A, low temperature resistant H profile steel of the think gauge for railway contact line pillar and preparation method thereof.Disclose a kind of think gauge for pillar of electrification rail contacting net (edge of a wing thickness >=28mm) low temperature resistant H profile steel and preparation method thereof, the weight percentage of the chemical composition of described low temperature resistant H profile steel is: C 0.10 ~ 0.22%, Si 0.10 ~ 0.40%, Mn 0.5 ~ 1.1%, P≤0.020%, S≤0.010%, Nb 0.02 ~ 0.05%, Ti 0.003-0.015%, and all the other are iron and trace impurity.This patent is Nb-microalloying scheme.
Chinese invention patent: open (bulletin) number-CN102618781B, a kind of hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof.A kind of hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof, the weight percentage of the chemical composition of described hot-rolled H-shaped steel for low temperature-resisting structure is: C 0.12 ~ 0.22%, Si 0.10 ~ 0.40%, Mn 1.1 ~ 1.50%, P≤0.025%, S≤0.025%, V 0.01 ~ 0.05%, and all the other are iron and trace impurity.The present invention is mainly through reducing sulphur content, and microalloying mainly applies vanadium, does not add other element, and casting process adopts the full guard casting of the immerseable flat mouth of a river.Because of the complicacy of special-shaped billet continuous casting machine, do not adopt aluminium deoxidation.Therefore, low temperature resistant steel mechanical property of the present invention is good ,-20 DEG C of average 90J of impact of collision merit.This patent is vanadium micro-alloying scheme, and low-temperature impact temperature is-20 DEG C.
Chinese invention patent: open (bulletin) number-CN102021475B, a kind of preparation method of hot-rolled H-shaped steel for low temperature-resisting structure.A kind of low temperature resistant H profile steel and preparation method thereof, the chemical component weight per-cent % of steel is 0.12 ~ 0.22, Si 0.10 ~ 0.40, Mn 1.1 ~ 1.50, P≤0.025, S≤0.025, Nb 0.02 ~ 0.05; All the other are iron and trace impurity.Its preparation method comprises desulfurization, 120 tons of top and bottom combined blown converter smeltings, LF refining, casting for shaped blank continuous, large H-shaped steel rolling, after external refining, oxygen level in molten steel is≤10ppm, in casting process, superheating temperature controls at 20 ~ 30 DEG C, casting blank specification is 555 × 440 × 90, 750 × 370 × 90, 1024 × 390 × 90, the soaking temperature of process furnace 1200 ~ 1300 DEG C, start rolling temperature for be 1100 ~ 1180 DEG C outside the edge of a wing, web central authorities are 1100 ~ 1170 DEG C, outside the finishing temperature edge of a wing be 850 ~ 960 DEG C, web central authorities are 800 ~ 880 DEG C, roll specification is the H profile steel of H250 ~ H900.This patent is Nb-microalloying scheme.
Chinese invention patent: open (bulletin) number-CN103276310A, a kind of there is low-temperature flexibility contain rare earth H profile steel and production method thereof.Disclose a kind of have low-temperature flexibility containing rare earth H profile steel and production method thereof, belong to metallurgical and field shaping technique, raw material is that (Wt%) is blast-melted 90%, high-quality steel scrap 10%, and Chemical Composition in Cast Billet and content (Wt%) are: C 0.07-0.12; Si 0.10-0.30; Mn 1.10-1.40; P≤0.015; S≤0.005; Cr 0.10-0.30; Ni 0.90-1.20; V 0.05-0.20; Ti 0.01-0.03; Al 0.01-0.04; Rare earth elements RE 0.0005-0.010; Cu < 0.10; Remaining is Fe and the trace element that cannot detect; Its technical process is: roll → dephosphorize by high pressure water → CCS universal rolling → aligning → cooling → sawing → flaw detection in hot metal pretreatment → top and bottom combined blown converter smelting → LF stove refining → VD vacuum-treat → billet continuous casting → cutting → strand heating → dephosphorize by high pressure water → BD1 cogging → BD2; Its mechanical property is: yield strength is 460 ~ 530MPa, tensile strength is 630 ~ 720MPa, yield tensile ratio≤0.80, unit elongation >=26%, traverse impact value: aKV >=100J/cm2 (-80 DEG C).
Summary of the invention
The object of the present invention is to provide a kind of hot rolled H-shaped production technology that can meet-50 DEG C of impact properties and require, enable H profile steel have good low-temperature impact resistance toughness under-50 DEG C and following low temperature environment.Concrete technical scheme is as follows:
A kind of hot rolled H-shaped production method, steel contains chemical composition according to weight percent: carbon 0.07 ~ 0.15%, silicon 0.15 ~ 0.35%, manganese 1.00 ~ 1.45%, phosphorus≤0.020%, sulphur≤0.015%, content of vanadium 0.020 ~ 0.060%, content of niobium 0.010 ~ 0.060%, Als >=0.015%, comprise the steps: converter smelting; Argon station; LF refining; Casting; Rolling.
The step of hot metal pretreatment is also carried out before converter smelting.
Casting adopts the casting of Hot Metal in Beam Blank full guard, and the compression ratio of special-shaped blank and H profile steel finished product is less than 3.
Rolling adopts the rolling of H profile steel A line.
Steel contains chemical composition according to weight percent and also comprises balance iron and other alloying element trace.
In heating steel billet technique, heating and temperature control is at 1220 ~ 1240 DEG C.
In rolling temperature technique start rolling temperature control 1050 ~ 1150 DEG C, 3 frame universal rolling passage start rolling temperatures control at 900 ~ 950 DEG C, finishing temperature control is at 850 ~ 950 DEG C; And/or cooling adopts air cooling; And/or the draft of omnipotent passage controls more than 40%.
A kind of hot rolled H-shaped, adopt the production method of above-mentioned H profile steel to prepare.
Its think gauge having-50 DEG C of good low-temperature toughness for niobium vanadium composite micro-alloying is hot rolled H-shaped.
The edge of a wing and web thickness scope 30mm ~ 40mm.
Compared with currently available technology, the 428x407x20x35 specification H profile steel that the present invention produces by the production method that a kind of-50 DEG C of low-temperature flexibilities are hot rolled H-shaped, its-50 DEG C of low-temperature flexibilities, more than 167J, have extremely low ductile-brittle transition temperature and good low-temperature toughness, improve quality product.Take Hot Metal in Beam Blank as raw material, what adopt the measures such as hot metal pretreatment, the large pressure of low temperature and cooling control after rolling to produce is hot rolled H-shaped, and-50 DEG C of low-temperature flexibilities etc. can meet-50 DEG C of impact property requirements.Meanwhile, adopting H profile steel to substitute welded H section steel can reduce welding sequence, improves job schedule, material use efficiency and security.Product has that production cost is low, intensity high and low temperature good toughness, feature that welding property is excellent.
Embodiment
Describe the present invention below, it is a kind of preferred embodiment in numerous embodiments of the present invention.
In a preferred embodiment, hot metal pretreatment → converter smelting → Argon station → LF refining → Hot Metal in Beam Blank full guard casting → H profile steel A line rolling technology flow process is adopted.The chemical composition of steel: carbon controls 0.07 ~ 0.15%, silicon controls 0.15 ~ 0.35%, manganese controls 1.00 ~ 1.45%, phosphorus controls≤0.020%, sulphur controls≤0.015%, content of vanadium controls 0.020 ~ 0.060%, content of niobium controls 0.010 ~ 0.060%, Als controls >=0.015%, other alloying element trace; The compression ratio of special-shaped blank and H profile steel finished product is less than 3, heating steel billet technology controlling and process: heating and temperature control is at 1220 ~ 1240 DEG C; Rolling temperature technology controlling and process: start rolling temperature control 1050 ~ 1150 DEG C, 3 frame universal rolling passage start rolling temperatures control at 900 ~ 950 DEG C, finishing temperature control is at 850 ~ 950 DEG C; Process for cooling controls: air cooling; The draft of omnipotent passage controls more than 40%; The H profile steel edge of a wing and web thickness scope 30mm ~ 40mm.
Embodiment 1: 428 × 407 × 20 × 35 specifications hot rolled H-shaped produced by present invention process, tensile strength 507MPa, yield strength 411MPa, the longitudinal V-type ballistic work 158J of unit elongation 28.5% ,-50 DEG C, heat analysis C content is 0.09%, content of vanadium 0.042%, content of niobium 0.023%, carbon equivalent is 0.36%.
Embodiment 2: 715*300*20.5*31.5 specification hot rolled H-shaped produced by present invention process, tensile strength 484MPa, yield strength 391MPa, the longitudinal V-type ballistic work 144J of unit elongation 27.5% ,-50 DEG C, heat analysis C content is 0.10%, content of vanadium 0.043%, content of niobium 0.020%, carbon equivalent is 0.37%.
Embodiment 3: 429 × 400 × 23 × 35.5 specifications hot rolled H-shaped produced by present invention process, tensile strength 488MPa, yield strength 387MPa, the longitudinal V-type ballistic work 135J of unit elongation 27% ,-50 DEG C, heat analysis C content is 0.11%, content of vanadium 0.044%, content of niobium 0.025%, carbon equivalent is 0.37%.
Above to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed method of the present invention design and the various improvement carried out of technical scheme, or directly apply to other occasion, all within protection scope of the present invention without improvement.
Claims (10)
1. a hot rolled H-shaped production method, it is characterized in that, steel contains chemical composition according to weight percent: carbon 0.07 ~ 0.15%, silicon 0.15 ~ 0.35%, manganese 1.00 ~ 1.45%, phosphorus≤0.020%, sulphur≤0.015%, content of vanadium 0.020 ~ 0.060%, content of niobium 0.010 ~ 0.060%, Als >=0.015%, comprise the steps: converter smelting; Argon station; LF refining; Casting; Rolling.
2. production method hot rolled H-shaped as claimed in claim 1, is characterized in that, also carries out the step of hot metal pretreatment before converter smelting.
3. production method hot rolled H-shaped as claimed in claim 1 or 2, is characterized in that, casting adopts the casting of Hot Metal in Beam Blank full guard, and the compression ratio of special-shaped blank and H profile steel finished product is less than 3.
4. the hot rolled H-shaped production method according to any one of claim 1-3, is characterized in that, rolling adopts the rolling of H profile steel A line.
5. the hot rolled H-shaped production method according to any one of claim 1-4, is characterized in that, steel contains chemical composition according to weight percent and also comprises balance iron and other alloying element trace.
6. the hot rolled H-shaped production method according to any one of claim 1-5, is characterized in that, in heating steel billet technique, heating and temperature control is at 1220 ~ 1240 DEG C.
7. the hot rolled H-shaped production method according to any one of claim 1-6, it is characterized in that, in rolling temperature technique start rolling temperature control 1050 ~ 1150 DEG C, 3 frame universal rolling passage start rolling temperatures control at 900 ~ 950 DEG C, finishing temperature control is at 850 ~ 950 DEG C; And/or cooling adopts air cooling; And/or the draft of omnipotent passage controls more than 40%.
8. one kind hot rolled H-shaped, it is characterized in that, adopt the production method of the H profile steel as described in claim 1-7 to prepare.
9. hot rolled H-shaped as claimed in claim 8, it is characterized in that, its think gauge having-50 DEG C of good low-temperature toughness for niobium vanadium composite micro-alloying is hot rolled H-shaped.
10. hot rolled H-shaped as claimed in claim 8 or 9, it is characterized in that, the edge of a wing and web thickness scope 30mm ~ 40mm.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107699792A (en) * | 2017-09-30 | 2018-02-16 | 钢铁研究总院 | A kind of low temperature resistant micro alloyed steel and production technology |
| CN107737806A (en) * | 2017-10-23 | 2018-02-27 | 山东钢铁股份有限公司 | A kind of think gauge pillar of electrification rail contacting net is with hot rolled H-shaped and preparation method thereof |
| CN107868910A (en) * | 2017-11-21 | 2018-04-03 | 安徽金阳金属结构工程有限公司 | A kind of low temperature resistant toughness H profile steel and its production technology |
| CN110578090A (en) * | 2019-09-25 | 2019-12-17 | 马鞍山钢铁股份有限公司 | Hot-rolled H-shaped steel with yield strength of 500MPa and production method thereof |
| CN111229827A (en) * | 2020-03-02 | 2020-06-05 | 马鞍山钢铁股份有限公司 | Hot-rolled H-shaped steel with yield strength of 450MPa and production method thereof |
| CN111748744A (en) * | 2020-07-08 | 2020-10-09 | 马鞍山钢铁股份有限公司 | Hot-rolled H-shaped steel and production method thereof |
| CN112030074A (en) * | 2020-08-31 | 2020-12-04 | 马鞍山钢铁股份有限公司 | Low-temperature-resistant hot-rolled H-shaped steel with yield strength of 460MPa and preparation method thereof |
| CN113088814A (en) * | 2021-03-25 | 2021-07-09 | 武汉钢铁有限公司 | Economical low-temperature-resistant F-shaped steel and production method thereof |
| CN113528936A (en) * | 2021-06-02 | 2021-10-22 | 包头钢铁（集团）有限责任公司 | Method for producing hot-rolled H-shaped steel for DH36 ocean engineering structure by adopting special-shaped blank |
| CN113699441A (en) * | 2021-07-29 | 2021-11-26 | 马鞍山钢铁股份有限公司 | Flange super-thick hot-rolled H-shaped steel with good low-temperature impact toughness and production method thereof |
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2015
- 2015-06-03 CN CN201510299469.4A patent/CN104862588A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107699792A (en) * | 2017-09-30 | 2018-02-16 | 钢铁研究总院 | A kind of low temperature resistant micro alloyed steel and production technology |
| CN107699792B (en) * | 2017-09-30 | 2019-06-28 | 钢铁研究总院 | A kind of low temperature resistant micro alloyed steel and production technology |
| CN107737806A (en) * | 2017-10-23 | 2018-02-27 | 山东钢铁股份有限公司 | A kind of think gauge pillar of electrification rail contacting net is with hot rolled H-shaped and preparation method thereof |
| CN107868910A (en) * | 2017-11-21 | 2018-04-03 | 安徽金阳金属结构工程有限公司 | A kind of low temperature resistant toughness H profile steel and its production technology |
| CN110578090A (en) * | 2019-09-25 | 2019-12-17 | 马鞍山钢铁股份有限公司 | Hot-rolled H-shaped steel with yield strength of 500MPa and production method thereof |
| CN111229827B (en) * | 2020-03-02 | 2021-07-23 | 马鞍山钢铁股份有限公司 | Hot-rolled H-shaped steel with yield strength of 450MPa and production method thereof |
| CN111229827A (en) * | 2020-03-02 | 2020-06-05 | 马鞍山钢铁股份有限公司 | Hot-rolled H-shaped steel with yield strength of 450MPa and production method thereof |
| CN111748744A (en) * | 2020-07-08 | 2020-10-09 | 马鞍山钢铁股份有限公司 | Hot-rolled H-shaped steel and production method thereof |
| CN111748744B (en) * | 2020-07-08 | 2021-08-03 | 马鞍山钢铁股份有限公司 | Hot-rolled H-shaped steel and production method thereof |
| CN112030074A (en) * | 2020-08-31 | 2020-12-04 | 马鞍山钢铁股份有限公司 | Low-temperature-resistant hot-rolled H-shaped steel with yield strength of 460MPa and preparation method thereof |
| CN113088814A (en) * | 2021-03-25 | 2021-07-09 | 武汉钢铁有限公司 | Economical low-temperature-resistant F-shaped steel and production method thereof |
| CN113528936A (en) * | 2021-06-02 | 2021-10-22 | 包头钢铁（集团）有限责任公司 | Method for producing hot-rolled H-shaped steel for DH36 ocean engineering structure by adopting special-shaped blank |
| CN113699441A (en) * | 2021-07-29 | 2021-11-26 | 马鞍山钢铁股份有限公司 | Flange super-thick hot-rolled H-shaped steel with good low-temperature impact toughness and production method thereof |
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