CN105506437A - Production method of hard ultra-low carbon steel - Google Patents
Production method of hard ultra-low carbon steel Download PDFInfo
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- CN105506437A CN105506437A CN201410505148.0A CN201410505148A CN105506437A CN 105506437 A CN105506437 A CN 105506437A CN 201410505148 A CN201410505148 A CN 201410505148A CN 105506437 A CN105506437 A CN 105506437A
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- carbon steel
- ultra low
- titanium
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- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 8
- 230000003647 oxidation Effects 0.000 claims abstract description 7
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 7
- 230000005855 radiation Effects 0.000 claims abstract description 7
- 238000000137 annealing Methods 0.000 claims abstract description 5
- 238000005097 cold rolling Methods 0.000 claims abstract description 5
- 239000010936 titanium Substances 0.000 claims description 43
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 22
- 229910052719 titanium Inorganic materials 0.000 claims description 22
- 229910052799 carbon Inorganic materials 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 11
- 239000010955 niobium Substances 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 239000005864 Sulphur Substances 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000009472 formulation Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 3
- 238000007639 printing Methods 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to a production method of hard ultra-low carbon steel, which specifically comprises the following process steps: in the rolling process, the inlet temperature of finish rolling is controlled to be 1050-1075 ℃; when the hot-rolled finished product of IF steel with the thickness of 2.5 mm-3.5 mm is obtained, the thickness of the intermediate billet is controlled to be 38 mm-42 mm; in the cold rolling process, the control range of the RTF of the radiation heating section of the annealing furnace is approximately 760 ℃ to 790 ℃, and the NOF of the non-oxidation section is 600 ℃ to 660 ℃. The invention has the advantages that: by the invention, a new ultra-low carbon steel grade is developed, which not only meets the requirement that the elongation rate reaches 40%, but also has the yield strength stably reaching 240MPa, and no obvious yield platform appears after baking processing, so that the product meets the quality requirement of the ultra-low carbon steel.
Description
Technical field
The invention belongs to hot rolled strip technology field, particularly relate to a kind of production method of hard ultra low-carbon steel.
Background technology
Ultra low-carbon steel is also " gapless atomic steel ", since the eighties in 20th century, has become the focus of auto sheet area research and production in the world.Take IFsteel as the mark that three generations's auto sheet production level of representative has become a national Iron & Steel Development level.Through smelting the raising of level in recent years, in the level, Control and Inclusion Removal etc. of steel inner element Composition Control, all achieve huge breakthrough, Ultra-low carbon composition and production technique are also tending towards ripe.
The Ultra-low carbon composition of steel occurred in the market and production technique are roughly (CT refers to coiling temperature):
In process of production, all carried out adding the system of keeping under strict control to each Composition Control of ultra low-carbon steel.Carbon content roughly controls as≤0.003%, and target is 0.002%; It is 0.14 ~ 0.18% that Fe content controls, and target is 0.16%; Phosphorus content controls as≤0.015%, and target is 0.008%; Sulphur content controls as≤0.012%, and target is 0.006%; It is 0.05 ~ 0.08% that titanium content controls, and target is 0.065%.Production technique aspect, heating, finishing temperature and oiler temperature control target are 1250 DEG C, 930 DEG C and 680 DEG C.Take above composition and technological temperature can ensure that Ultra-low carbon substrate reaches yield strength 180MPa ~ 220MPa, tensile strength reaches 250MPa ~ 300MPa, extends and reaches more than 48%.
But, along with the expansion of Ultra-low carbon Application Areas, client is also more and more extensive to ultralow-carbon application, also progressively improves the requirement of Ultra-low carbon performance, wish that ultra low-carbon steel yield strength can reach 240MPa ~ 270MPa, ensure that unit elongation reaches the requirement of 40% simultaneously.
Summary of the invention
For overcoming the deficiencies in the prior art, the object of this invention is to provide a kind of hard ultra low-carbon steel production method, enabling Finished Steel yield strength reach more than 240Mpa, ensure that unit elongation reaches 40% simultaneously.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of hard ultra low-carbon steel production method, ultra low-carbon steel is by weight percentage: C0.004% ~ 0.006%, N≤0.003%, S≤0.008%, Ti0.06% ~ 0.08%, Mn0.1% ~ 0.3%, P≤0.02%, specifically comprises following processing step:
Hot metal pretreatment → converter smelting → RH external refining → sheet billet continuous casting → heating → rolling → section cooling → batch → spray printing mark → warehouse-in → cold rolling, wherein,
1), in the operation of rolling, entry temperature at finishing controls at 1050 DEG C ~ 1075 DEG C;
2) when the IF steel that hot-rolled finished product thickness is 2.5mm ~ 3.5mm, workpiece thickness controls at 38mm ~ 42mm;
3), in cold-rolled process, annealing furnace radiation heating section temperature RTF span of control is roughly 760 DEG C ~ 790 DEG C, and non-oxidation section temperature NOF is 600 DEG C ~ 660 DEG C.
Titanium elements content calculates according to titanium equivalent dominated formulate:
Ti equivalent=Ti*/48 × 12/C+Nb/93 × 12/C), wherein Ti*=Ti-48/14 × N-48/32 × S;
Wherein, Ti* is titanium equivalent, titanium equivalent value Ti* >=2.5, and C is carbon content, and Ti is titanium content, and N is nitrogen content, and Nb is content of niobium, and S is sulphur content.
Ultra low-carbon steel determination is by weight percentage derived according to production board yield strength and composition and process relation formula, and production board yield strength and composition and process relation formula are:
Yield strength (ultra low-carbon steel)=1234+22671*C-4083Ti+111Mn+0.223NOF-1.23RTF+K;
Wherein, NOF is non-oxidation section temperature, and RTF is radiation heating section temperature, and C is carbon content, and Ti is titanium content, and Mn is Fe content, and K is for regulating constant;
Compared with prior art, the invention has the beneficial effects as follows:
By the present invention, develop Ultra-low carbon new steel grade, this steel grade not only meets the requirement that unit elongation reaches 40%, and yield strength is also stable reaches 240MPa, and does not occur obvious yield point elongation after baking processing, and product meets the specification of quality of ultra low-carbon steel.
Embodiment
Below the present invention is described in detail, but it should be noted that enforcement of the present invention is not limited to following embodiment.
A kind of hard ultra low-carbon steel production method, ultra low-carbon steel is by weight percentage: C0.004% ~ 0.006%, N≤0.003%, S≤0.008%, Ti0.06% ~ 0.08%, Mn0.1% ~ 0.3%, P≤0.02%, specifically comprises following processing step:
Hot metal pretreatment → converter smelting → RH external refining → sheet billet continuous casting → heating → rolling → section cooling → batch → spray printing mark → warehouse-in → cold rolling, wherein,
1), in the operation of rolling, entry temperature at finishing controls at 1050 DEG C ~ 1075 DEG C;
2) when the IF steel that hot-rolled finished product thickness is 2.5mm ~ 3.5mm, workpiece thickness controls at 38mm ~ 42mm;
3), in cold-rolled process, annealing furnace radiation heating section temperature RTF span of control is roughly 760 DEG C ~ 790 DEG C, and non-oxidation section temperature NOF is 600 DEG C ~ 660 DEG C.
Titanium elements content calculates according to titanium equivalent dominated formulate:
Ti equivalent=Ti*/48 × 12/C+Nb/93 × 12/C), wherein Ti*=Ti-48/14 × N-48/32 × S;
Wherein, Ti* is titanium equivalent, titanium equivalent value Ti* >=2.5, and C is carbon content, and Ti is titanium content, and N is nitrogen content, and Nb is content of niobium, and S is sulphur content.
Ultra low-carbon steel determination is by weight percentage derived according to production board yield strength and composition and process relation formula, and production board yield strength and composition and process relation formula are:
Yield strength (ultra low-carbon steel)=1234+22671*C-4083Ti+111Mn+0.223NOF-1.23RTF+K;
Wherein, NOF is non-oxidation section temperature, and RTF is radiation heating section temperature, and C is carbon content, and Ti is titanium content, and Mn is Fe content, and K is for regulating constant;
Embodiment:
Ultra low-carbon steel, carbon content is 0.005%, and nitrogen element component content is 0.002%, and element sulphur component content is 0.005%, and manganese element component content is 0.2%, and phosphoric component content is 0.1%.
In order to ensure gap-free atom, titanium elements content adjusts according to titanium equivalent dominated formulate, controls 0.075%, and titanium equivalent controls 2.6.Entry temperature at finishing controls, at 1060 DEG C ~ 1070 DEG C, also to take into account the control of surface quality while guaranteed performance.Be the ultra low-carbon steel of 2.8mm ~ 3.2mm to hot-rolled finished product thickness, workpiece thickness controls at 39mm ~ 41mm.
Cold rolling process annealing furnace RTF span of control is roughly 760 ~ 790 DEG C, and NOF is 600 ~ 660 DEG C.
Not only meet the requirement that unit elongation reaches 40%, yield strength is also stable reaches 240MPa, and does not occur obvious yield point elongation after baking processing, and product meets the specification of quality of ultra low-carbon steel.
Claims (3)
1. a hard ultra low-carbon steel production method, is characterized in that, ultra low-carbon steel is by weight percentage: C0.004% ~ 0.006%, N≤0.003%, S≤0.008%, Ti0.06% ~ 0.08%, Mn0.1% ~ 0.3%, P≤0.02%, specifically comprises following processing step:
Hot metal pretreatment → converter smelting → RH external refining → sheet billet continuous casting → heating → rolling → section cooling → batch → spray printing mark → warehouse-in → cold rolling, wherein,
1), in the operation of rolling, entry temperature at finishing controls at 1050 DEG C ~ 1075 DEG C;
2) when the IF steel that hot-rolled finished product thickness is 2.5mm ~ 3.5mm, workpiece thickness controls at 38mm ~ 42mm;
3), in cold-rolled process, annealing furnace radiation heating section temperature RTF span of control is roughly 760 DEG C ~ 790 DEG C, and non-oxidation section temperature NOF is 600 DEG C ~ 660 DEG C.
2. a kind of hard ultra low-carbon steel production method according to claim 1, is characterized in that, titanium elements content calculates according to titanium equivalent dominated formulate:
Ti equivalent=Ti*/48 × 12/C+Nb/93 × 12/C), wherein Ti*=Ti-48/14 × N-48/32 × S;
Wherein, Ti* is titanium equivalent, titanium equivalent value Ti* >=2.5, and C is carbon content, and Ti is titanium content, and N is nitrogen content, and Nb is content of niobium, and S is sulphur content.
3. a kind of hard ultra low-carbon steel production method according to claim 1, it is characterized in that, ultra low-carbon steel determination is by weight percentage derived according to production board yield strength and composition and process relation formula, and production board yield strength and composition and process relation formula are:
Yield strength (ultra low-carbon steel)=1234+22671*C-4083Ti+111Mn+0.223NOF-1.23RTF+K;
Wherein, NOF is non-oxidation section temperature, and RTF is radiation heating section temperature, and C is carbon content, and Ti is titanium content, and Mn is Fe content, and K is for regulating constant.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410505148.0A CN105506437A (en) | 2014-09-25 | 2014-09-25 | Production method of hard ultra-low carbon steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410505148.0A CN105506437A (en) | 2014-09-25 | 2014-09-25 | Production method of hard ultra-low carbon steel |
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| CN105506437A true CN105506437A (en) | 2016-04-20 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100473741C (en) * | 2005-06-29 | 2009-04-01 | 宝山钢铁股份有限公司 | Soft tin-plate and making process thereof |
| CN101956133A (en) * | 2010-10-29 | 2011-01-26 | 攀钢集团钢铁钒钛股份有限公司 | Low-yield strength anti-ageing continuous annealing cold-roll steel sheet and production method thereof |
| CN102912232A (en) * | 2012-11-16 | 2013-02-06 | 内蒙古包钢钢联股份有限公司 | Ultra-deep-draw Ti-IF steel cold rolling and annealing process |
| CN104046895A (en) * | 2013-06-07 | 2014-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Interstitial free steel cold-rolled steel plate and production method thereof |
-
2014
- 2014-09-25 CN CN201410505148.0A patent/CN105506437A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100473741C (en) * | 2005-06-29 | 2009-04-01 | 宝山钢铁股份有限公司 | Soft tin-plate and making process thereof |
| CN101956133A (en) * | 2010-10-29 | 2011-01-26 | 攀钢集团钢铁钒钛股份有限公司 | Low-yield strength anti-ageing continuous annealing cold-roll steel sheet and production method thereof |
| CN102912232A (en) * | 2012-11-16 | 2013-02-06 | 内蒙古包钢钢联股份有限公司 | Ultra-deep-draw Ti-IF steel cold rolling and annealing process |
| CN104046895A (en) * | 2013-06-07 | 2014-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Interstitial free steel cold-rolled steel plate and production method thereof |
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Application publication date: 20160420 |