CN109881099A - A kind of Low-cost production method of high-tensile structural steel - Google Patents
A kind of Low-cost production method of high-tensile structural steel Download PDFInfo
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- CN109881099A CN109881099A CN201910205200.3A CN201910205200A CN109881099A CN 109881099 A CN109881099 A CN 109881099A CN 201910205200 A CN201910205200 A CN 201910205200A CN 109881099 A CN109881099 A CN 109881099A
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- structural steel
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Abstract
The invention discloses a kind of Low-cost production method of high-tensile structural steel, the ingredient of the structural steel is designed: at being grouped as and weight percent: [C]: 0.165~0.21%；[Si]: 0.15-0.35%；[Mn]: 0.4~0.6%；[P] :≤0.025%；[S] :≤0.0020%；[Nb]: 0.011~0.022%；[Al]: 0.010~0.045%；[N] :≤0.0080%, other is iron and impurity；The control of continuous casting parameter: within the scope of continuous casting perseverance pulling rate 1.0-1.3, defect free slab production, the direct hot delivery and hot charging of slab.The present invention can make the Q355B that niobium cannot be used to strengthen originally successfully realize converter smelting Argon directly upper continuous casting, and hot delivery and hot charging, and cost is greatly lowered.
Description
Technical field
The present invention relates to a kind of Low-cost production methods of high-tensile structural steel.
Background technique
Since the serious excess capacity of steel has become the norm in boundary, only change is asked in innovation, is only the only way.Xinjiang Aug. 1st
Steel joint-stock company is the needs for adapting to variation and itself growth of market environment, only produces the high product of cost performance,
It can base oneself upon.
Therefore, in conjunction with the producing line feature of eight steel companies, steel and rolled steel linkage is refined, carbon drop manganese is mentioned, according to niobium, vanadium, titanium alloy
The variation of price.By the innovation of management mode, system cost declining is the unique channel for improving enterprise competitiveness.Since slab lacks
Falling into causes the use of ferro-niobium to be restricted, and vanadium iron price is odd high, causes hot rolling Q345B product profitability low.Q355 series
Hot-strip is the conventional products of eight steel, and market demand is huge, and current cost of alloy has had reached very low level.Pass through
To eight steel 2018 production Q355B C D ingredient compare analysis.Finished product [Mn] content of eight steel of Q355B has already decreased to
0.60% lower value, (Liuzhou steel mill is greater than 1.0%, and 1.0%) wine steel [Mn] content is greater than, alloy strengthening element and similar enterprise
Industry has arrived extremely low.
The mode of manufacture Q355B that eight steel are strengthened using low manganese, micro vanadium at present, advantage is that slab quality is good, is not needed
Chamfering cleaning, can be heat-fed with direct hot charging；The disadvantage is that vanadium iron price is extra-high, and fluctuate big.
Compared by calculating, replaces vanadium iron to be produced using cheap ferro-niobium and ferrotianium, huge warp will be generated
Ji benefit；Niobium strengthening cooling can it is straight on, but niobium-containing steel plate base is easy to appear chink, influences hot-loading and hot-conveying, and chamfering cleaning increases
Logistics and production efficiency are influenced while cost.Solving slab chink is one of practical difficulties.
Summary of the invention
The purpose of the present invention is to provide a kind of Low-cost production method of high-tensile structural steel, can make use originally
The Q355B that niobium is strengthened successfully realizes converter smelting Argon directly upper continuous casting, and hot delivery and hot charging, and cost is greatly lowered.
The object of the present invention is achieved like this, a kind of Low-cost production method of high-tensile structural steel, ingredient design: at
It is grouped as and weight percent: [C]: 0.165~0.21%；[Si]: 0.15-0.35%；[Mn]: 0.4~0.6%；[P] :≤
0.025%；[S] :≤0.0020%；[Nb]: 0.011~0.022%；[Al]: 0.010~0.045%；[N] :≤0.0080%,
Other is iron and impurity；The control of continuous casting parameter: within the scope of continuous casting perseverance pulling rate 1.0-1.3, defect free slab is produced, and slab is direct
Hot delivery and hot charging.
Implementation result see the table below: C element controls 0.15-0.20%, Si control of element 0.12-0.25%, Mn control of element
0.51-0.65%, account for output 97.25% of the carbon less than 0.19.
By to current ingredient mechanical property and constituent analysis, the main influence for considering to mention after carbon to elongation after fracture, mesh
The 97%(sample 661 that accounts for total amount of the preceding ingredient elongation after fracture less than 22%).Carbon up-regulation 0.01%, steel making working procedure strengthen tapping carbon
The control of content, quantity of the carbon greater than 0.2 will be less than 5%.
Because the control of craft precision is usually horizontal closely bound up with the understanding of people, idea, behavioural habits and operation, usually
Equipment precision is needed to guarantee.By double precision management implementation, the manufacturing capacity for making steel producing line is promoted, make originally cannot use contain
The production of niobium Q345B slab zero defect, can be heat-fed with direct hot charging, with the variation in alloy market, select overall cost (it is comprehensive at
This includes cost of alloy, process cost, slab disposal costs) minimum tapping mark tissue produces, and it is that company creates benefit.By
Belong to the maximum low-alloy structural steel of the market demand in eight steel in Q355 series, 200,000 tons is produced within 2019, compared with 2018
Ton steel reduces by 196 yuan of cost, reduces cost: it is expected that 2019 reduced by 39,200,000 yuan of cost than 2018.
Specific embodiment
A kind of Low-cost production method of high-tensile structural steel, ingredient design: at being grouped as and weight percent:
[C]: 0.165~0.21%；[Si]: 0.15-0.35%；[Mn]: 0.4~0.6%；[P] :≤0.025%；[S] :≤0.0020%；
[Nb]: 0.011~0.022%；[Al]: 0.010~0.045%；[N] :≤0.0080%, other is iron and impurity；Continuous casting parameter
Control: within the scope of continuous casting perseverance pulling rate 1.0-1.3, defect free slab production, the direct hot delivery and hot charging of slab.
Claims (1)
1. a kind of Low-cost production method of high-tensile structural steel, it is characterised in that: the ingredient of the structural steel designs: at being grouped as
And weight percent: [C]: 0.165~0.21%；[Si]: 0.15-0.35%；[Mn]: 0.4~0.6%；[P] :≤0.025%；
[S] :≤0.0020%；[Nb]: 0.011~0.022%；[Al]: 0.010~0.045%；[N] :≤0.0080%, other is iron
And impurity；The control of continuous casting parameter: within the scope of continuous casting perseverance pulling rate 1.0-1.3, defect free slab production, slab is directly heat-fed heat
Dress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910205200.3A CN109881099A (en) | 2019-03-18 | 2019-03-18 | A kind of Low-cost production method of high-tensile structural steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910205200.3A CN109881099A (en) | 2019-03-18 | 2019-03-18 | A kind of Low-cost production method of high-tensile structural steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109881099A true CN109881099A (en) | 2019-06-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201910205200.3A Pending CN109881099A (en) | 2019-03-18 | 2019-03-18 | A kind of Low-cost production method of high-tensile structural steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112095050A (en) * | 2020-10-09 | 2020-12-18 | 新疆八一钢铁股份有限公司 | Production method of low-alloy high-strength structural steel |
| CN114941067A (en) * | 2020-12-30 | 2022-08-26 | 日照钢铁控股集团有限公司 | Steel billet for producing hot-rolled H-shaped steel with flange thickness of 15-35 mm |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899557A (en) * | 2012-11-02 | 2013-01-30 | 湖南华菱湘潭钢铁有限公司 | Production method of low-alloy medium plate |
| JP2016222983A (en) * | 2015-06-01 | 2016-12-28 | 新日鐵住金株式会社 | Steel for crude oil tank, crude oil tank and corrosion preventing method of crude oil tank |
-
2019
- 2019-03-18 CN CN201910205200.3A patent/CN109881099A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899557A (en) * | 2012-11-02 | 2013-01-30 | 湖南华菱湘潭钢铁有限公司 | Production method of low-alloy medium plate |
| JP2016222983A (en) * | 2015-06-01 | 2016-12-28 | 新日鐵住金株式会社 | Steel for crude oil tank, crude oil tank and corrosion preventing method of crude oil tank |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112095050A (en) * | 2020-10-09 | 2020-12-18 | 新疆八一钢铁股份有限公司 | Production method of low-alloy high-strength structural steel |
| CN112095050B (en) * | 2020-10-09 | 2021-08-27 | 新疆八一钢铁股份有限公司 | Production method of low-alloy high-strength structural steel |
| CN114941067A (en) * | 2020-12-30 | 2022-08-26 | 日照钢铁控股集团有限公司 | Steel billet for producing hot-rolled H-shaped steel with flange thickness of 15-35 mm |
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Application publication date: 20190614 |