CN103157658A - Process of rolling stainless steel coil in conventional hot continuous rolling production line - Google Patents
Process of rolling stainless steel coil in conventional hot continuous rolling production line Download PDFInfo
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- CN103157658A CN103157658A CN2013101263245A CN201310126324A CN103157658A CN 103157658 A CN103157658 A CN 103157658A CN 2013101263245 A CN2013101263245 A CN 2013101263245A CN 201310126324 A CN201310126324 A CN 201310126324A CN 103157658 A CN103157658 A CN 103157658A
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Abstract
The invention discloses a process of rolling a stainless steel coil in a conventional hot continuous rolling production line. A stainless steel slab with the thickness of 150-250mm is placed in a heating furnace, the tapping temperature of the slab is 1200 DEG C-1300 DEG C, the time when the slab is in the furnace is 150-400min, the slab is taken out of the furnace and continuously rolled for 5-7 times after being descaled through a rough rolling descaling machine, and a medium slab is manufactured. The medium slab enters a hot coiling box through a middle roller way for uncoiling, is cropped through a flying shear, and enters a fine continuous rolling mill composed of seven machine frames after being descaled through a fine rolling descaling machine so as to be manufactured into strip steel with the thickness of 2.2-3.5mm. The strip steel enters a coiling machine after being cooled through laminar flow and is coiled to form a steel coil. The rolling process does not need increasing of equipment investment, is stable in rolling, high in comprehensive yield and good in quality of the surface of the strip steel, and has application and popularization value.
Description
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Technical field
the present invention relates to a kind of stainless rolling mill practice, relate in particular to a kind of on the conventional hot continuous rolling machine production line technique (method) of (or utilizing the conventional hot continuous rolling machine production line) rolling (thin specification) stainless-steel roll.
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Background technology
at present, domesticly can utilize the conventional hot continuous rolling machine production line to produce stainless enterprise to mainly contain Taiyuan Iron and Steel Co., peace steel, Mei Gang etc., in producing the stainless steel process, ubiquitous problem is: 1. because stainless steel is higher to the stability requirement of heating-up temperature, easily in heating process, produce fine and close oxide layer and cause the de-scaling difficulty; 2. when the thin specification stainless steel of rolling, roll-force is large, head and tail temperature difference is excessive, cause rolling unstable, plate shape is poor, the easy whipping of finish rolling, it is above that its reason is that the high temperature hot deformation resistance due to austenitic stainless steel doubles than straight carbon steel, causes roll-force to increase, directly cause roll wear, also increased the difficulty that plate shape is controlled; 3. stainless steel easily produces and scratches and scroll; 4. stainless steel is high temperature rolling, easily produces at the scene dust pollution, is that long-time baking easily damages because the high temperature production stainless steel makes equipment in addition.
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Summary of the invention
in order to overcome the deficiencies in the prior art, the object of the present invention is to provide a kind of technique (method) that standby investment can be guaranteed again stainless-steel roll surface quality, plate shape is good and lumber recovery is high rolling on the conventional hot continuous rolling machine line (thin specification) stainless-steel roll of not setting up.
for achieving the above object, the technical solution used in the present invention is: of the present invention a kind of during on the conventional hot continuous rolling machine production line, the technique of rolling stainless-steel roll comprises the steps: the stainless steel slab of 150 ㎜～250 ㎜ thickness is installed to heating furnace, the stainless steel slab is 150min～400min from advancing heating furnace to the time that goes out heating furnace, and the tapping temperature of stainless steel slab is 1200 ℃～1300 ℃.Slab after coming out of the stove send roughing descaler, opens the collector on roughing descaler, and the discharge pressure that makes roughing descaler is 18MPa～20 MPa, to the de-scaling of stainless steel slab.Stainless steel slab after thick de-scaling is sent into to the intermediate blank that roughing mill tandem rolling 5～7 passages are rolled into 30 ㎜～50 ㎜ thickness, and the roughing finishing temperature is controlled at 1020 ℃～1200 ℃, and intermediate blank enters the Coil Box uncoiling by delay table.Intermediate blank after uncoiling is by the flying shear crop, send again the finish rolling descaling mill, open a wherein collector of finish rolling descaling mill, the discharge pressure that makes the finish rolling descaling mill is 18MPa～20 MPa, the finishing tandem rolling unit that the intermediate blank of essence after de-scaling enters seven frames is rolled into the band steel of 2.2 ㎜～3.5 ㎜ thickness, the finishing temperature of finishing tandem rolling unit is 800 ℃～1100 ℃, and the mill speed of controlling the 7th frame F7 of finishing tandem rolling unit is 8 m/s～15 m/s.The band steel shut out from the 7th frame F7 is carried out to laminar flow cooling, cooled band steel is led and entered coiling machine and coil into coil of strip by side, coiling temperature is 500 ℃～800 ℃.
adopt that as above technical scheme provides a kind of on the conventional hot continuous rolling machine production line rolling stainless-steel roll technique compared with prior art, technique effect is:
1. can utilize the rolling of existing conventional hot continuous rolling machine production line, not need to increase equipment investment, save production cost.
2. production is surely suitable, and production efficiency is high, and production capacity reaches 350t/h～360 t/h.
3. finished product rate reaches 95.0～99.0%.
4. the stainless-steel roll surface quality improves, and has the advantages that plate shape is good.
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The specific embodiment
below in conjunction with embodiment, the specific embodiment of the present invention is described in further detail.
of the present invention a kind of on the conventional hot continuous rolling machine production line technique of rolling stainless-steel roll on existing production line, realize, this cover conventional hot continuous rolling machine production line is the intrinsic equipment of enterprise (applicant), it (mainly) comprises heating furnace, roughing descaler, roughing mill, delay table, Coil Box, finish rolling descaling mill, flying shear, finishing tandem rolling unit, coiling machine and bat winding apparatus, is prior art.
first the stainless steel slab (the external supply of material) of 150 ㎜～250 ㎜ thickness is installed to (best is cold charge) in heating furnace, described heating furnace can be selected walking beam heating furnace, and this heating furnace has preheating section, bringing-up section and soaking zone.The stainless steel slab is packed into after heating furnace, closes the burner on preheating section, opens the burner on bringing-up section, with coal gas (or natural gas etc.), the stainless steel slab is heated.The stainless steel slab is controlled at 150min～400min from entering heating furnace to the time that goes out heating furnace, when the stainless steel slab reaches while coming out of the stove 1200 ℃～1300 ℃ of target temperatures, comes out of the stove.
stainless steel slab after coming out of the stove send the roughing descaler de-scaling, and opening the collector be arranged on roughing descaler, to make the discharge pressure of roughing descaler be 18MPa～20 MPa, and the foreign material that Ex-all stainless steel slab forms on surface because of heating, as iron scale.Stainless steel slab after de-scaling is sent into to the intermediate blank that roughing mill tandem rolling 5～7 passages are rolled into 30 ㎜～50 ㎜ thickness, roughing finishing temperature (RDT) is controlled to 1020 ℃～1200 ℃.Intermediate blank after roughing is entered to the Coil Box uncoiling through delay table, and the intermediate blank after uncoiling is exchanged end to end, to guarantee the even of rolling temperature.
intermediate blank after uncoiling (thickness is 30 ㎜～50 ㎜) is by the flying shear crop, send again the finish rolling descaling mill, open a wherein collector of finish rolling descaling mill, the discharge pressure that makes the finish rolling descaling mill is 18MPa～20 MPa, and the finishing tandem rolling unit that the intermediate blank after smart de-scaling enters seven frames is rolled into the band steel of 2.2 ㎜～3.5 ㎜ thickness.Described finishing tandem rolling unit is by the first frame F1, the second frame F2 ... the 7th frame F7 forms.Control 800 ℃～1100 ℃ of the finishing temperatures (FDT) of finishing tandem rolling unit and the 7th frame F7(end frame well) mill speed 8 m/s～15 m/s, through the rolling parameter of model calculative determination the first frame F1 to the six frame F6.
band steel from the 7th frame F7 shuts out is carried out to laminar flow cooling, cooled band steel (thickness=2.2 ㎜～3.5 ㎜) is entered to coiling machine by the side delivery and coil into coil of strip, coiling temperature is 500 ℃～800 ℃.After strip coiling completes, on step rate, the coil of strip that a tower is arranged is clapped to volume with the bat winding apparatus, guarantee coil of strip appearance quality.
embodiment 1
by the stainless steel slab cold charge of 150 ㎜ thickness to walking beam heating furnace, preheating section burner Close All, stainless steel slab time inside furnace is 200min, slab reaches while coming out of the stove 1230 ℃ of target temperatures comes out of the stove, enter the roughing descaler de-scaling, open the collector on roughing descaler, discharge pressure is 18MPa, laggard roughing mill tandem rolling 5 passages of slab de-scaling are rolled into the intermediate blank of 30 ㎜ thickness, the roughing finishing temperature is 1070 ℃, intermediate blank enters the Coil Box uncoiling by delay table, intermediate blank after uncoiling is sent the finish rolling descaling mill after the flying shear crop, open a wherein collector of finish rolling descaling mill, discharge pressure is 18MPa.The finishing tandem rolling unit that the intermediate blank of essence after de-scaling enters seven frames is rolled into the band steel of 2.2 ㎜ thickness, and the finishing temperature of finishing tandem rolling unit is 1000 ℃, and the 7th frame F7 mill speed is 10m/s.Band after steel goes out F7, adopts the laminar flow cooling system, and the band steel is led and entered coiling machine and coil into coil of strip by side, on step rate, the coil of strip that a tower is arranged is clapped to volume with the bat winding apparatus, and coiling temperature is 600 ℃.Production capacity reaches 355t/h, and finished product rate is 96.5%.
embodiment 2
the stainless steel slab cold charge that 250 ㎜ are thick is to walking beam heating furnace, preheating section burner Close All, stainless steel slab time inside furnace is 300min, slab reaches while coming out of the stove 1270 ℃ of target temperatures comes out of the stove, enter the roughing descaler de-scaling, open the collector on roughing descaler, discharge pressure is 20MPa, laggard roughing mill tandem rolling 7 passages of slab de-scaling are rolled into the intermediate blank of 35 ㎜ thickness, the roughing finishing temperature is 1100 ℃, intermediate blank enters the Coil Box uncoiling by delay table, intermediate blank after uncoiling is sent the finish rolling descaling mill after the flying shear crop, open a wherein collector of finish rolling descaling mill, discharge pressure is 20MPa, the finishing tandem rolling unit that the intermediate blank of essence after de-scaling enters seven frames is rolled into the band steel of 3.5 ㎜ thickness, the finishing temperature of finishing tandem rolling unit is 1100 ℃, the 7th frame F7 mill speed is 13m/s.The band steel goes out after F7 to adopt the laminar flow cooling system, and the band steel is led and entered coiling machine and coil into coil of strip by side, on step rate, the coil of strip that a tower is arranged is clapped to volume with the bat winding apparatus, and coiling temperature is 700 ℃.Production capacity in this embodiment reaches 352 t/h, and finished product rate reaches 98.4%.
embodiment 3
by the stainless steel slab cold charge of 200 ㎜ thickness in walking beam heating furnace, heating furnace preheating section burner Close All, stainless steel slab time inside furnace is 250 min, when reaching while coming out of the stove 1250 ℃ of target temperatures, the stainless steel slab comes out of the stove, stainless steel slab after coming out of the stove enters roughing descaler, open the collector on roughing descaler, discharge pressure is 19MPa.Laggard roughing mill tandem rolling 6 passages of stainless steel slab (slightly) de-scaling are rolled into the intermediate blank of 35 ㎜ thickness, 1150 ℃ of roughing finishing temperatures.Intermediate blank is sent the finish rolling descaling mill after the flying shear crop by delay table, open a wherein collector of finish rolling descaling mill, and discharge pressure is 19MPa.Intermediate blank after (essence) de-scaling enters the band steel that the finishing tandem rolling unit be comprised of seven frames is rolled into 3.0 ㎜ thickness, and the finishing temperature of finishing tandem rolling unit is 950 ℃, and the mill speed of controlling finishing tandem rolling unit the 7th frame F7 is 12m/s.The band steel goes out that to adopt the laminar flow cooling system to carry out after the 7th frame F7 cooling, and cooled band steel is led and entered coiling machine and coil into coil of strip, 650 ℃ of coiling temperatures by side.On step rate, the coil of strip that a tower is arranged is clapped to volume with the bat winding apparatus.Production capacity is 362t/h, and finished product rate reaches 97.3%.
Claims (1)
1.
a kind of on the conventional hot continuous rolling machine production line technique of rolling stainless-steel roll, it is characterized in that: the stainless steel slab of 150 ㎜～250 ㎜ thickness is installed in heating furnace, the stainless steel slab from advance heating furnace to the time that goes out heating furnace be 150 min～400 min, the tapping temperature of stainless steel slab is 1200 ℃～1300 ℃, slab after coming out of the stove send roughing descaler, open the collector on roughing descaler, the discharge pressure that makes roughing descaler is 18MPa～20 MPa, to the de-scaling of stainless-steel roll base; Stainless steel slab after thick de-scaling is sent into to the intermediate blank that roughing mill tandem rolling 5～7 passages are rolled into 30 ㎜～50 ㎜ thickness, and the roughing finishing temperature is controlled at 1020 ℃～1200 ℃, and intermediate blank enters the Coil Box uncoiling by delay table; Intermediate blank after uncoiling is by the flying shear crop, send again the finish rolling descaling mill, open a wherein collector of finish rolling descaling mill, the discharge pressure that makes the finish rolling descaling mill is 18MPa～20 MPa, the finishing tandem rolling unit that the intermediate blank of essence after de-scaling enters seven frames is rolled into the band steel of 2.2 ㎜～3.5 ㎜ thickness, the finishing temperature of finishing tandem rolling unit is 800 ℃～1100 ℃, and the mill speed of controlling the 7th frame F7 of finishing tandem rolling unit is 8 m/s～15 m/s; The band steel shut out from the 7th frame F7 is carried out to laminar flow cooling, cooled band steel is led and entered coiling machine and coil into coil of strip by side, coiling temperature is 500 ℃～800 ℃.
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| CN2013101263245A CN103157658A (en) | 2013-04-12 | 2013-04-12 | Process of rolling stainless steel coil in conventional hot continuous rolling production line |
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| CN103521518A (en) * | 2013-10-14 | 2014-01-22 | 云南昆钢新型复合材料开发有限公司 | Hot continuous rolling production method of stainless steel composite board strip coil |
| CN104001717A (en) * | 2014-05-26 | 2014-08-27 | 张家港浦项不锈钢有限公司 | Manufacturing technique of rolled steels |
| CN104138901A (en) * | 2014-07-17 | 2014-11-12 | 首钢总公司 | Production method of hot-rolled acid pickling band steel with thickness being smaller than or equal to 1.6mm |
| CN104275350A (en) * | 2014-08-06 | 2015-01-14 | 振石集团东方特钢股份有限公司 | Rolling method of heat-resistant austenitic stainless steel |
| CN104438373A (en) * | 2013-09-18 | 2015-03-25 | 攀钢集团攀枝花钢钒有限公司 | Strip steel hot continuous rolling method |
| CN105642672A (en) * | 2016-03-09 | 2016-06-08 | 首钢京唐钢铁联合有限责任公司 | Control method for oxide scale of steel containing phosphorus and boron |
| CN106180185A (en) * | 2016-07-19 | 2016-12-07 | 唐山国丰钢铁有限公司 | 08Al belt steel rolling technique |
| CN107262532A (en) * | 2017-05-31 | 2017-10-20 | 舞阳钢铁有限责任公司 | A kind of heating rolling production method of ultra-wide stainless steel plate |
| CN108004370A (en) * | 2017-11-27 | 2018-05-08 | 湖南华菱涟源钢铁有限公司 | A kind of technique with surface control powder method production 6~18mm vehicle structure steel plates |
| CN109365530A (en) * | 2018-10-09 | 2019-02-22 | 鞍钢股份有限公司 | A kind of high-level non-orientation silicon steel hot continuous rolling process |
| CN110404970A (en) * | 2019-08-01 | 2019-11-05 | 响水德丰金属材料有限公司 | A kind of stainless steel band hot-roll forming production technology |
| CN111420985A (en) * | 2020-03-31 | 2020-07-17 | 湖南华菱湘潭钢铁有限公司 | Rolling process of 38CrMoAl round steel |
| CN111495992A (en) * | 2020-05-10 | 2020-08-07 | 湖南华菱湘潭钢铁有限公司 | High-pressure water descaling system and descaling method for hot-rolled bar |
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| CN114700364A (en) * | 2022-03-30 | 2022-07-05 | 张家港宏昌钢板有限公司 | Method for improving hot rolling stability of 75Cr1 saw blade steel |
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| CN114700364A (en) * | 2022-03-30 | 2022-07-05 | 张家港宏昌钢板有限公司 | Method for improving hot rolling stability of 75Cr1 saw blade steel |
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Application publication date: 20130619 |