CN104073730A - Stamping narrow-strip-steel and ultra-fast cooling production process thereof - Google Patents
Stamping narrow-strip-steel and ultra-fast cooling production process thereof Download PDFInfo
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- CN104073730A CN104073730A CN201410355070.9A CN201410355070A CN104073730A CN 104073730 A CN104073730 A CN 104073730A CN 201410355070 A CN201410355070 A CN 201410355070A CN 104073730 A CN104073730 A CN 104073730A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a stamping narrow-strip-steel and an ultra-fast cooling production process thereof, and belongs to the technical field of narrow strip steel production in the metallurgical industry. The ultra-fast cooling production process comprises the following steps: smelting by a converter; hot rolling comprising casting blank heating, rough rolling, finish rolling, cooling by an ultra-fast cooling system, and curling, wherein the temperature of the strip steel entering the ultra-fast cooling system is 870-910 DEG C, the temperature of the strip steel out of the ultra-fast cooling system is 690-720 DEG C, and the cooling rate is 150-200 DEG C/s; the ultra-fast cooling system comprises multiple sets of cooling devices; a check block (3) is arranged between each two sets of cooling devices; each set of the cooling device comprises two control cooling units; each control cooling unit comprises a nozzle unit, and a manual butterfly valve (1) and a pneumatic double-layer diaphragm valve (2) connected with the nozzle unit; each nozzle unit comprises a plurality of fan-shaped nozzles; an included angle is formed between each two nozzles; the nozzles are arranged on the two sides of the strip steel uniformly. According to the invention, the ultra-fast cooling system is adopted, the grains are refined, and the homogeneity of the structure is improved.
Description
Technical field
The present invention relates to a kind of punching press Ribbon Steel and ultrafast cold production technique thereof, belong to metallurgy industry Ribbon Steel production technical field.
Background technology
Along with the needs of advanced steel product exploitation, control cooling technology and turn to the control to the whole cooling course of strip by traditional control that begins to cool down temperature and termination cooling temperature to rolling rear steel plate, its essence is by the temperature control to rolling rear strip process of cooling, reach the control to phase transformation and tissue morphology in strip process of cooling.Supper-fast cooling (Ultra Fast Cooling), be called for short UFC, be grow up in the world in recent years one for controlling the new technology cooling with steel, ultrafast cooling system is generally applied in during wide steel strip produces, and in Ribbon Steel is produced, not yet uses ultrafast refrigeration technique.
Summary of the invention
The object of the invention is to provide a kind of punching press Ribbon Steel and ultrafast cold production technique thereof, by ultrafast cooling system, refinement band crystalline grain of steel, increased homogeneity of structure, there is good elongation and punching performance, solve the problem existing in background technology.
The technical scheme of this practicality invention is:
A kind of punching press Ribbon Steel, chemical composition mass percent: C:0.030~0.070%, Si :≤0.03%, Mn:0.25-0.40%, P≤0.02%, S≤0.015%, residual element Cr≤0.08% in AlS:0.020-0.050% steel, Ni≤0.10%, Cu≤0.05%, As≤0.03%, all the other are iron and are inevitably mingled with.
The ultrafast cold production technique of Ribbon Steel for above-mentioned punching press, comprises following processing step:
1, converter smelting
(1) converter smelting endpoint composition: C≤0.05%, S≤0.030%, P≤0.018%,
(2) terminal falls rifle and deeply blows time >=1min,
(3) converter steelmaking process finishing slag basicity 2.9 ± 0.3;
2, LF refining
(1) determine oxygen value according to ladle and feed aluminum steel, molten steel AlS is transferred to 0.045-0.055%, aluminum steel feeding speed 4.0-4.5m/s,
(2) soft argon blowing time >=3min;
3, continuous casting
Connect and water temperature: 1594~1604 DEG C;
4, hot rolling: comprise strand heating, roughing, finish rolling, ultrafast cooling system, curling, strand start rolling temperature is 1110~1150 DEG C, described ultrafast cooling system be located at finish rolling and curling between, the temperature of entering ultrafast cooling system with steel is 870~910 DEG C, be 690-720 DEG C with the temperature of steel excess of export fast cooling system, rate of cooling is 150-200 DEG C/s, described ultrafast cooling system comprises many group refrigerating units, between two adjacent groups refrigerating unit, be provided with block, every group of refrigerating unit comprises two and controls cooling unit, Hand-operated butterfly valve and pneumatic bilayer film valve that each control cooling unit comprises nozzle unit and is connected with nozzle unit, described nozzle unit comprises multiple nozzles, nozzle is fan nozzle, between nozzle, be provided with angle, nozzle is evenly arranged in band steel both sides,
5, cold rolling, bell-type annealing furnace annealing peace is whole, band steel after hot rolling, on single chassis reversable mill, carry out cold rolling, band steel after rolling enters bell-type annealing furnace annealing, the highest annealing temperature of bell-type annealing furnace annealing is 690 DEG C, soaking time is 15-17 hour, carries out smoothly after annealing, and smooth unit elongation is 1-2%.
Compared with prior art, unusual effect of the present invention and technical characterstic are as follows:
(1) hot rolling of the present invention adopts ultrafast cooling system, refinement crystal grain, increased homogeneity of structure;
(2) maximum press depth reaches 80mm, and yield tensile ratio in kind reaches 0.60-0.70, and elongation is 35-37%.
Brief description of the drawings
Fig. 1 is the ultrafast cooling system structural representation of the present invention;
In figure: Hand-operated butterfly valve 1, pneumatic bilayer film valve 2, block 3, water-cooled tube 4, pressure transmitter 5, under meter 6.
Embodiment
Below in conjunction with accompanying drawing, by example, the invention will be further described.
A kind of punching press Ribbon Steel, chemical composition mass percent: C:0.030~0.070%, Si :≤0.03%, Mn:0.25-0.40%, P≤0.02%, S≤0.015%, residual element Cr≤0.08% in AlS:0.020-0.050% steel, Ni≤0.10%, Cu≤0.05%, As≤0.03%, all the other are iron and are inevitably mingled with.
The ultrafast cold production technique of Ribbon Steel for punching press, comprises following processing step: 1. converter smelting, 2. hot rolling, 3. cold rolling, bell-type annealing furnace annealing peace is whole; Described hot rolling comprises strand heating, roughing, finish rolling, ultrafast cooling system, curling, and described ultrafast cooling system is arranged in finish rolling retrotorsion guide groove, adopts band steel zygomorphy to arrange in structure, carries out cooling from both direction to band steel simultaneously.Comprise six groups of refrigerating units with reference to ultrafast cooling system described in accompanying drawing 1, between two adjacent groups refrigerating unit, be provided with 3 of blocks, every group of refrigerating unit comprises two and controls cooling unit, control cooling unit for totally 12, DN50 Hand-operated butterfly valve 1 and the pneumatic bilayer film valve 2 of DN50 that each control cooling unit comprises nozzle unit and is connected with nozzle unit, described nozzle unit comprises 18 nozzles, nozzle is fan nozzle, between nozzle, be provided with angle, can ensure that two side nozzles have identical cooling power, ensure that band steel is cooling evenly.Nozzle is evenly arranged in band steel both sides.
Ultrafast refrigeration technique cooling zone is short, and cooling power is large, so require the control of ultrafast cooling system very accurate.In process of cooling, if heat-sinking capability deficiency can cause that cooling later to still have part austenitic transformation be ferrite, in matrix, can there is the ferrite that part grain size is larger; If heat-sinking capability is excessive, there will be part austenite to bainite transformation, although high ten ferrites of the yield strength of bainite, the plasticity of material can reduce.
In the time that band steel head enters rack of finishing mill, trigger the micro-tracing routine of band steel head by this signal.Calculate with steel head the particular location in cooling zone according to last gantry speed.In the time that band steel afterbody leaves rack of finishing mill, trigger the micro-tracing routine of band steel afterbody by this signal.Calculate with steel afterbody the particular location in cooling zone according to last gantry speed.
Describedly cold rollingly on 650mm single chassis reversable mill, carry out cold rollingly, reduction system is 2.5 mm-0.63, mm-0.85, mm-1.1, mm-1.6 mm-0.5 mm.
As can be seen from the above table, the Ribbon Steel that the present invention produces is compared with wide steel strip SPHC, and (1) Ribbon Steel is produced flexibly, cost is low; (2) be better than wide steel strip SPHC by performance after ultrafast cold production; (3) wide strip uses wedge shape problem more outstanding after cutting out bar, and when cold rolling, plate shape is bad, and the appearance that can greatly reduce the problems referred to above is produced in easily steel bonding with Ribbon Steel.
Opening plate of the present invention carries out stamping parts punching press, and punching press qualification rate reaches 98.8%.
Claims (3)
1. a punching press Ribbon Steel, it is characterized in that chemical composition mass percent: C:0.030~0.070%, Si :≤0.03%, Mn:0.25-0.40%, P≤0.02%, S≤0.015%, residual element Cr≤0.08% in AlS:0.020-0.050% steel, Ni≤0.10%, Cu≤0.05%, As≤0.03%, all the other are iron and are inevitably mingled with.
2. a ultrafast cold production technique for Ribbon Steel for punching press, is characterized in that comprising following processing step: 1. converter smelting: converter smelting endpoint mass percent: C≤0.05%, and S≤0.03%, P≤0.018%, connects and waters temperature: 1594~1604 DEG C, 2. hot rolling: comprise strand heating, roughing, finish rolling, ultrafast cooling system, curling, strand start rolling temperature is 1110~1150 DEG C, described ultrafast cooling system be located at finish rolling and curling between, the temperature of entering ultrafast cooling system with steel is 870~910 DEG C, be 690-720 DEG C with the temperature of steel excess of export fast cooling system, rate of cooling is 150-200 DEG C/s, described ultrafast cooling system comprises many group refrigerating units, between two adjacent groups refrigerating unit, be provided with block (3), every group of refrigerating unit comprises two and controls cooling unit, Hand-operated butterfly valve (1) and pneumatic bilayer film valve (2) that each control cooling unit comprises nozzle unit and is connected with nozzle unit, described nozzle unit comprises multiple nozzles, nozzle is fan nozzle, between nozzle, be provided with angle, nozzle is evenly arranged in band steel both sides.
3. the ultrafast cold production technique of Ribbon Steel for punching press according to claim 2, it is characterized in that also comprising in processing step cold rolling, bell-type annealing furnace annealing peace is whole, the highest annealing temperature of described bell-type annealing furnace annealing is 690 DEG C, soaking time is 15-17 hour, and described smooth unit elongation is 1-2%.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104651712A (en) * | 2015-03-18 | 2015-05-27 | 唐山国丰钢铁有限公司 | CQ-grade hot-dip galvanization steel strip for anti-theft door plate and production process thereof |
CN105177408A (en) * | 2015-10-16 | 2015-12-23 | 唐山瑞丰钢铁(集团)有限公司 | Low-cost hot-rolled thin strip steel containing boron and manufacturing method thereof |
CN105234194A (en) * | 2015-11-04 | 2016-01-13 | 东北大学 | Ultrafast cooling device for hot continuous rolled narrow strip steel and control method of ultrafast cooling device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103938103A (en) * | 2014-04-15 | 2014-07-23 | 河北钢铁股份有限公司唐山分公司 | Tin MRT-3 base plate for two-piece tank and production method of base plate |
CN103937949A (en) * | 2014-03-19 | 2014-07-23 | 唐山国丰钢铁有限公司 | Fast cooling process for hot rolled narrow strip |
-
2014
- 2014-07-24 CN CN201410355070.9A patent/CN104073730A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103937949A (en) * | 2014-03-19 | 2014-07-23 | 唐山国丰钢铁有限公司 | Fast cooling process for hot rolled narrow strip |
CN103938103A (en) * | 2014-04-15 | 2014-07-23 | 河北钢铁股份有限公司唐山分公司 | Tin MRT-3 base plate for two-piece tank and production method of base plate |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104651712A (en) * | 2015-03-18 | 2015-05-27 | 唐山国丰钢铁有限公司 | CQ-grade hot-dip galvanization steel strip for anti-theft door plate and production process thereof |
CN105177408A (en) * | 2015-10-16 | 2015-12-23 | 唐山瑞丰钢铁(集团)有限公司 | Low-cost hot-rolled thin strip steel containing boron and manufacturing method thereof |
CN105234194A (en) * | 2015-11-04 | 2016-01-13 | 东北大学 | Ultrafast cooling device for hot continuous rolled narrow strip steel and control method of ultrafast cooling device |
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