CN103173598B - Annealing-free medium-high carbon steel plate making technology - Google Patents
Annealing-free medium-high carbon steel plate making technology Download PDFInfo
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- CN103173598B CN103173598B CN201310076240.5A CN201310076240A CN103173598B CN 103173598 B CN103173598 B CN 103173598B CN 201310076240 A CN201310076240 A CN 201310076240A CN 103173598 B CN103173598 B CN 103173598B
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- 229910000677 High-carbon steel Inorganic materials 0.000 title claims abstract description 12
- 238000005516 engineering process Methods 0.000 title description 5
- 238000005096 rolling process Methods 0.000 claims abstract description 78
- 238000001816 cooling Methods 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000010959 steel Substances 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 229910000954 Medium-carbon steel Inorganic materials 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 238000010926 purge Methods 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims 1
- 239000007921 spray Substances 0.000 claims 1
- 238000000137 annealing Methods 0.000 abstract description 10
- 239000013078 crystal Substances 0.000 abstract description 3
- 229910001562 pearlite Inorganic materials 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 229910001567 cementite Inorganic materials 0.000 abstract description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000012141 concentrate Substances 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 206010027146 Melanoderma Diseases 0.000 description 1
- 241000277275 Oncorhynchus mykiss Species 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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- Metal Rolling (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
本发明涉及一种免退火型中高碳钢板制造工艺，属于轧钢工艺技术领域。技术方案是：包含加热炉加热、立辊轧制、粗轧除鳞、粗轧轧制、中间冷却、--精轧除鳞、精轧轧制、层流冷却、卷取机卷取和集中堆冷工序，所述的中间冷却工序，在板坯进行粗轧轧制工序之后，进--精轧除鳞工序之前，通过冷却装置对板坯进行冷却，冷却装置的冷却能力使板坯降温至840℃以下。本发明的有益效果：所生产的产品断后伸长率明显上升，产品硬度降低了7.2-21%，其组织中铁素体比例占60%以上，铁素体晶粒适当粗化，珠光体团小而分散，珠光体中的渗碳体片变薄、变碎并部分粒状化。由于具有较低的硬度和较高的塑性，可以免除轧制之后的退火工序，达到在线软化的目的。The invention relates to an annealing-free medium-high carbon steel plate manufacturing process, which belongs to the technical field of steel rolling process. The technical solution is: including furnace heating, vertical roll rolling, rough rolling descaling, rough rolling, intermediate cooling, -- finishing rolling descaling, finishing rolling, laminar cooling, coiler coiling and concentration Stacking cooling process, the intermediate cooling process, after the slab is subjected to rough rolling and rolling process, before entering the finishing rolling and descaling process, the slab is cooled by the cooling device, and the cooling capacity of the cooling device makes the slab cool down to below 840°C. Beneficial effects of the present invention: the elongation rate of the produced product increases significantly after breaking, the hardness of the product decreases by 7.2-21%, the proportion of ferrite in the structure accounts for more than 60%, the ferrite crystal grains are properly coarsened, and the pearlite group is small While dispersed, the cementite sheets in the pearlite become thinner, fragmented and partially granulated. Due to its low hardness and high plasticity, the annealing process after rolling can be avoided to achieve the purpose of online softening.
Description
Technical field
The present invention relates to one and exempt from annealing type medium high carbon steel plate manufacturing process, belong to steel rolling process technical field.
Background technology
Because medium high carbon steel plate is mainly for the manufacture of cutlery and hardware tools, in product deep-processing process, generally occur that material hardness is too high, deep processing distortion difficulty, the problem such as processing units wearing and tearing are large.It is generally acknowledged that Spheroidizing Annealing is to reduce the best process means of medium and high carbon steel hardness, but incident is that production cost increases, production cycle multiplication, and the problem such as difficult quality guarantee in heat treatment process, a kind of production technique that can exempt annealing operation and can make medium high carbon steel plate lower hardness is badly in need of in this area.
Summary of the invention
The object of the invention is to provide one and exempts from annealing type medium high carbon steel plate manufacturing process, in its hot rolling production process, make online medium high carbon steel plate directly obtain softening, thereby save the annealing operation after hot rolling, avoid annealing operation to cause the surface decarburization of steel plate, be conducive to stable article quality, and can save energy, reduce costs, reduce environmental pollution, solve the problems referred to above that background technology exists.
Technical scheme of the present invention is: one is exempted from annealing type medium high carbon steel plate manufacturing process, comprise process furnace heating, roughing de-scaling, roughing rolling, intercooling,--finish rolling de-scaling, finish rolling rolling, laminar flow are cooling, reeling machine batches and concentrate heap cooling working procedure, described intercooling operation, after slab carries out roughing rolling process, enter--before finish rolling de-scaling operation, by refrigerating unit, slab is carried out coolingly, the cooling power of refrigerating unit is cooled to below 840 DEG C slab.
Described roughing rolling process: roughing mill possesses the high-power ability of depressing, and draft reaches more than 65%, thus the rolling load of finishing mill effectively reduced, alleviate the pressure of finishing train; Described finish rolling rolling process: the finish rolling stage adopts even ferrite area rolling of two-phase region rolling, rely on deformation induced Transformation Principle, increase on the one hand ferritic ratio in tissue, refinement ferrite crystal grain, make on the other hand the carbon concentration in supercooled austenite improve, dislocation and substructure density increase; Finishing mill possesses the ability of high speed tandem rolling, and the finish rolling end logical steel second flow of frame is not less than 20m
2/ s, reduces temperature drop, completes rolling.
Each procedure technology parameter is as follows:
(1) process furnace heating process: heating of plate blank is followed heating-soaking-insulation system, 1000～1150 DEG C of Heating temperatures, are incubated 1 hour, ensure that heating of plate blank is even, and without obvious blackspot, on elongated direction, base cross direction, the temperature difference is no more than 30 DEG C;
(2) edge rolling, roughing de-scaling, roughing rolling: drop into side guide and edge rolling, rolling load 50～100t before roughing; Before roughing, de-scaling water pressure is greater than 30Mpa;
(3) finish rolling de-scaling, finish rolling rolling: use PC plate shape to control convexity≤100 μ m, planeness≤50I; Finish rolling reduces temperature drop, ensures roll speed, and finishing temperature is controlled at more than 740 DEG C; Before finish rolling, de-scaling water pressure is greater than 30MPa;
(4) laminar flow is cooling: after finish rolling, enter laminar flow cooling section, cooling rate is controlled at 10～15 DEG C/s, and 5 meters of steel heads of band are not cooling, and the limit portion of the cold roller-way of the capable layer of open side spirt purges;
(5) reeling machine batches: the cooling complete reeling machine that enters batches rolling, 650～700 DEG C of coiling temperatures;
(6) concentrate heap cooling working procedure: after batching, concentrate and stack, ensure near steel plate soaking time Ar1 temperature, make cemetite lamellae attenuation in the perlite after Cooling Austenite Transformation, become broken and part spheroidizing, realize material on-lining soften.
Beneficial effect of the present invention: the product elongation after fracture of producing obviously rises, product hardness has reduced 7.2-21%, and in its tissue, ratio of ferrite accounts for more than 60%, the suitable alligatoring of ferrite crystal grain, pearlite colony is small and scattered, cemetite lamellae attenuation in perlite, becomes broken and part spheroidizing.Owing to thering is lower hardness and higher plasticity, can exempt rolling annealing operation afterwards, reach the object of on-lining soften.
Embodiment
The present invention will be further described by the following examples.
Embodiment 1: the qualified molten steel of steel mill's refining, continuous casting becomes 72*1500mm slab, and chemical composition is C:0.48%, Si:0.22%, Mn:0.70%, P:0.012%, S:0.007%, Als:0.020%, surplus is Fe; Continuously cast bloom adds thermal recovery 230m tunnel heating, 1080 DEG C of Heating temperatures, steel billet enters 2 roughing mills through roughing de-scaling after coming out of the stove, roughing total reduction 65%, after roughing, be cooled to 830 DEG C through intercooling, after finish rolling de-scaling, enter 5 finishing mills and be rolled, finished product thickness 5.0mm, after finish rolling completes, enter immediately laminar flow cooling section and be cooled to 680 ± 20 DEG C and batch, cooling in heap after rolling.Chemical composition is listed in table 1, and processing parameter is listed in table 2, and finished product mechanical property and hardness are in table 3.
Embodiment 2: the qualified molten steel of steel mill's refining, continuous casting becomes 72*1250mm slab, and chemical composition is C:0.49%, Si:0.20%, Mn:0.72%, P:0.010%, S:0.006%, Als:0.022%, surplus is Fe; Continuously cast bloom adds thermal recovery 230m tunnel heating, 1090 DEG C of Heating temperatures, steel billet enters 2 roughing mills through roughing de-scaling after coming out of the stove, roughing total reduction 65%, after roughing, be cooled to 840 DEG C through intercooling, after finish rolling de-scaling, enter 5 finishing mills and be rolled, finished product thickness 5.0mm, after finish rolling completes, enter immediately laminar flow cooling section and be cooled to 680 ± 20 DEG C and batch, cooling in heap after rolling.Chemical composition is listed in table 1, and processing parameter is listed in table 2, and finished product mechanical property and hardness are in table 3.
Embodiment 3: the qualified molten steel of steel mill's refining, continuous casting becomes 72*1500mm slab, and chemical composition is C:0.51%, Si:0.25%, Mn:0.72%, P:0.010%, S:0.008%, Als:0.024%, surplus is Fe; Continuously cast bloom adds thermal recovery 230m tunnel heating, 1070 DEG C of Heating temperatures, steel billet enters 2 roughing mills through roughing de-scaling after coming out of the stove, roughing total reduction 65%, after roughing, be cooled to 810 DEG C through intercooling, after finish rolling de-scaling, enter 5 finishing mills and be rolled, finished product thickness 4.5mm, after finish rolling completes, enter immediately laminar flow cooling section and be cooled to 680 ± 20 DEG C and batch, cooling in heap after rolling.Chemical composition is listed in table 1, and processing parameter is listed in table 2, and finished product mechanical property and hardness are in table 3.
Table 1
Table 2
Table 3
The medium high carbon steel plate of producing by the rolling technology of exempting to anneal, in tissue, cementite has been realized part spheroidizing, and steel plate hardness drops to 80-85HRB by the 93-105HRB of pair rolling.Fall reaches 7.2-21%.
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| CN201310076240.5A CN103173598B (en) | 2013-03-11 | 2013-03-11 | Annealing-free medium-high carbon steel plate making technology |
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| CN201310076240.5A CN103173598B (en) | 2013-03-11 | 2013-03-11 | Annealing-free medium-high carbon steel plate making technology |
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| CN103173598A CN103173598A (en) | 2013-06-26 |
| CN103173598B true CN103173598B (en) | 2014-10-15 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104438326B (en) * | 2014-10-17 | 2017-04-12 | 武汉钢铁(集团)公司 | Rolling technology for high-carbon steel in thin slab casting and rolling |
| CN106180185A (en) * | 2016-07-19 | 2016-12-07 | 唐山国丰钢铁有限公司 | 08Al belt steel rolling technique |
| CN106636590B (en) * | 2016-12-02 | 2018-04-03 | 燕山大学 | A kind of medium carbon steel thermo-mechanical processi method of alternative modifier treatment |
| CN106755870A (en) * | 2017-01-11 | 2017-05-31 | 唐山钢铁集团有限责任公司 | A kind of production method of think gauge medium and high carbon steel sheet material |
| CN109321830A (en) * | 2018-11-13 | 2019-02-12 | 湖南华菱涟源钢铁有限公司 | High-carbon steel plate with high ductility and toughness and high flatness and manufacturing method thereof |
| CN109321729B (en) * | 2018-11-28 | 2020-01-24 | 武汉科技大学 | Rolling method of high carbon steel |
| CN111545569B (en) * | 2020-05-20 | 2021-10-26 | 江苏华伟特种薄板有限公司 | Rolling process of low-manganese low-alloy steel plate |
| CN113290047A (en) * | 2021-05-21 | 2021-08-24 | 新余钢铁股份有限公司 | Processing method of low-carbon acid-washing steel substrate |
| CN113462985B (en) * | 2021-07-16 | 2022-07-19 | 鞍钢股份有限公司 | Low-cost high-surface-hardness tool steel with excellent annealing-free bending performance |
| CN116748300A (en) * | 2021-07-30 | 2023-09-15 | 日照钢铁控股集团有限公司 | Continuous casting and rolling production method of Cr-free 1.5mm45 steel |
| CN114231999A (en) * | 2021-12-21 | 2022-03-25 | 昆山正通铭金属有限公司 | Forming process of hexagonal wrench tool steel 6145 without spheroidizing annealing |
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Address after: 063016 Binhe Road, Hebei, Tangshan City, No. 9 Patentee after: HBIS COMPANY LIMITED TANGSHAN BRANCH Address before: 063016 Binhe Road, Hebei, Tangshan City, No. 9 Patentee before: Tangshan Branch of Hebei Iron & Steel Co.,Ltd. |
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