CN101748256A - Rolling and solution treatment method for 304 stainless strip steel - Google Patents
Rolling and solution treatment method for 304 stainless strip steel Download PDFInfo
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- CN101748256A CN101748256A CN201010033399A CN201010033399A CN101748256A CN 101748256 A CN101748256 A CN 101748256A CN 201010033399 A CN201010033399 A CN 201010033399A CN 201010033399 A CN201010033399 A CN 201010033399A CN 101748256 A CN101748256 A CN 101748256A
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Abstract
The invention relates to a rolling and solution treatment method for 304 stainless strip steel. The method includes the following sequential steps: (1) steel composition design: the weight percentage of C plus N in the steel is not larger than 0.12 percent; (2) heating of slab: the slab-heating temperature is controlled between 1240 DEG C and 1260 DEG C; (3) rough rolling: the thickness of the rough-rolled steel plate is set as 45mm to 50mm, and the rough-rolling temperature is 1110 DEG C to 1130 DEG C; (4) finish rolling: seven stands are used in finish rolling, one of the stands does not take part in rolling, and a finish rolling temperature control model is put into use in order to ensure that the finish rolling temperature is not lower than 1030 DEG C; and (5) after-rolling solution treatment: the finish-rolled strip steel passes through a heat cover, the temperature of the rolled strip steel is preserved at no less than 1030 DEG C for three to five minutes, and after heat preservation is finished, the strip steel is put into cooling water in order to be quickly cooled to less than 550 DEG C. The rolling and solution treatment method has the advantages of short treatment period and little energy consumption.
Description
Technical field
The present invention relates to a kind of method of rolling and solution treatment of 304 stainless steel bands.
Background technology
The existing 304 hot rolling technological process of productions are heating, roughing, finish rolling, cool off and batch, and 304 common technologies are not cool off after the finish rolling or fewly enter the reeling machine rolling after cold, are chilled to room temperature after the rolling and go up the solution annealing line again and carry out solution treatment.304 is that stainless steel hot-rolling coil must be handled through solution annealing before use, satisfies service requirements to guarantee its mechanical property and erosion resistance, reaches easy processing, moderate, the corrosion resistant purpose of intensity.The method of the rolling and solution treatment of existing 304 stainless steel bands is to build huge continous way solution annealing stove behind hot continuous rolling, being transported to annealing room after hot rolled coil is produced again handles, concrete operation method is that hot rolling is put and gone up continous way solution annealing production line again after cold and heat, be incubated, cool off supervisor, the final product performance that need of obtaining.The method that hot rolling 304 stainless-steel rolls adopt the solution annealing of the rolling postcooling reheat to handle, the history of existing last 100 years, this rolling cooling reheat carry out the solution annealing treatment process not only the production cost height, the time is long, energy consumption is big, also can increase the detrimentally affect of quality product and increase by a procedure, cause the band steel production cycle long, roll up cost and consumes energy.
Summary of the invention
For the above-mentioned deficiency of the method for the rolling and solution treatment that overcomes existing 304 stainless steel bands, the invention provides a kind of method of handling the rolling and solution treatment of short and 304 stainless steel bands that energy consumption is little of cycle.
Existing 304 stainless solution annealing methods are added to crystal grain inside for water after steel plate is heated to 1030 ℃ is as cold as room temperature by force to realize the inner impurity element of steel plate, with use properties and the erosion resistance of improving steel plate, this method is heated to annealing temperature with the cold conditions steel band.It is cold soon that the present invention directly utilizes the temperature of band steel after the hot rolling to realize after the impurity element solid solution, can realize the purpose of solution annealing equally.For temperature after realizing being with steel to roll reaches the solution annealing temperature, and realize the good solid solution of impurity element, make the band rigidity can satisfy standard-required simultaneously, need rolling technology and cooling are improved.
The method of the rolling and solution treatment of 304 stainless steel bands comprises following sequential steps:
(1) the steel grade composition is provided with
The main effect of solution annealing be with the C in the steel, N element solid solution in crystal grain, so the composition design time must control to lower level with C, the N element of steel grade, requires therefore that the mass percent of C+N in steel is not more than 0.12% in 304 steel; (C and N belong to the steel-making residual element, a standard set upper limit, and no lower limit requirement, therefore low more good more, but horizontal C and N mass percent that general steel-making can reach are about 0.12%, satisfy standard-required fully)
(2) slab heating
For guaranteeing that rolling back band steel has higher temperature, Heating temperature must reach a certain height, and considers 304 stainless character, and slab heating temperature is controlled at 1240～1260 ℃.
(3) roughing
For guaranteeing that finish rolling has enough drafts and higher finishing temperature, roughing has been rolled thickness and will have been tried one's best big and the temperature height of will trying one's best, and setting roughing, to roll the thickness of back steel plate be 45～50mm, and it is (roughing finishing temperature) 1110～1130 ℃ that temperature has been rolled in roughing.
(4) finish rolling
Finish rolling is totally seven frames, for increasing single stand stretch rate, (increase single frame draft and help the conversion of steel crystal grain, guarantee the grain fineness number of final finished) one of them frame does not participate in rolling, and drop into finishing temperature control model, guarantee that finishing temperature is not less than 1030 ℃.
(5) roll the back solution treatment
Roll the back and revert back to equi-axed crystal for guaranteeing that the band steel can be permitted to divide through rolling elongated grain, and can guarantee that C, N element in the steel plate are solid-solubilized in the crystal grain fair the branch, band steel after the finish rolling will be through the one section lagging facility that increases, generally be to do stay-warm case, (stay-warm case length is set according to rear portion 3～5 seconds requirement of insulation, should be 15～20 meters, and wide width according to rolled steel strip adds the surplus of 100mm and sets, high 300mm guarantees that the band steel can normally pass through.Material is an embedded with metal warming plate on the steelframe) can be to guarantee rolling back band steel in 3～5 seconds of temperature insulation that are not less than 1030 ℃, insulation finishes back input water coolant and will be with steel (with the cooling of laminar flow cooling apparatus water spray) to be cooled to enter the reeling machine rolling again below 550 ℃ fast.
The method of the rolling and solution treatment of these 304 stainless steel bands, need not to batch the coil of strip that is cooled to room temperature is heated to thermal treatment temp on again and carries out solution treatment at the solution annealing line, it is cold soon directly to utilize the temperature of band steel after the hot rolling to realize after the impurity element solid solution, can realize the effect of solution annealing equally.The present invention saves continuous annealing one cover operation, effectively enhances productivity and reduces production cost, and effect is enhanced productivity.Can satisfy standard-required fully with the steel plate use properties after the present invention's processing, check feature sees Table 1.
Table 1
| Project | Surrender R (P0.2)?(N/mm 2) | Tension R m??(N/mm 2) | Elongation (%) | Hardness (HBW) | Brilliant rotten |
| The ASTMA240/A240M standard-required | ?≥205 | ??≥515 | ??≥40 | ??≤201 | Do not allow the intergranular corrosion crackle |
| The actual sample assay | ?445 | ??740 | ??47 | ??192 | Intact/intact/intact/intact |
Embodiment
Describe the rolling and solution treatment of this 304 stainless steel bands in detail below in conjunction with embodiment
The embodiment of method, but the method for the rolling and solution treatment of 304 stainless steel bands is concrete
Embodiment is not limited to following embodiment.
Embodiment
The method of the rolling and solution treatment of 304 stainless steel bands is a following sequential steps:
(1) the steel grade composition is provided with
The long 11mm of slab of 304 steel of present embodiment, wide 1535mm, thick 200mm,
The quality per distribution ratio of C that contains in the slab and N is:
C：0.056％N：0.058％
The mass percent of C+N in steel is 0.114%.
(2) slab heating
304 slabs are delivered to be heated to 1250 ± 10 ℃ in the walking beam furnace.
(3) roughing
The steel billet of heating is delivered to roughing mill, and rolling through five passages, being rolled into thickness is 48mm
Hot-rolled steel sheet, it is 1120 ℃ that temperature has been rolled in roughing.
(4) finish rolling
The roughing steel plate is delivered to the finishing mill of seven frames, for increasing single stand stretch rate, a frame sky is established with six frames rolling, being rolled into thickness is the band steel of 10mm, and drops into finishing temperature control model, and finishing temperature is 1050 ℃.
(5) roll the back solution treatment
The band steel goes out after the finish rolling directly, and the speed with 4.8 meter per seconds is the stay-warm case of 20m by length, to guarantee that rolling back band steel can be incubated for 4 seconds more than 1030 ℃, intensive immediately input laminar cooling water will be with steel to be cooled to 530 ℃ fast after the band steel goes out stay-warm case, enter reeling machine again and be rolled into coil of strip.
Claims (1)
1. the method for the rolling and solution treatment of a stainless steel band, it comprises following sequential steps:
(1) the steel grade composition is provided with
Require that the mass percent of C+N in steel is not more than 0.12% in 304 steel;
(2) slab heating
Slab heating temperature is controlled at 1240～1260 ℃;
(3) roughing
The thickness that the back steel plate is rolled in the setting roughing is 45～50mm, and it is 1110～1130 ℃ that temperature has been rolled in roughing;
(4) finish rolling
Finish rolling is totally seven frames, and one of them frame does not participate in rolling, and drop into finishing temperature control model, guarantees that finishing temperature is not less than 1030 ℃;
(5) roll the back solution treatment
Band steel after the finish rolling will roll the back and be with steel in 3～5 seconds of temperature insulation that are not less than 1030 ℃ through the stay-warm case that increases, and insulation finishes back input water coolant and will be with steel to be cooled to below 550 ℃ fast.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010033399A CN101748256A (en) | 2010-01-15 | 2010-01-15 | Rolling and solution treatment method for 304 stainless strip steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010033399A CN101748256A (en) | 2010-01-15 | 2010-01-15 | Rolling and solution treatment method for 304 stainless strip steel |
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| CN101748256A true CN101748256A (en) | 2010-06-23 |
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| CN201010033399A Pending CN101748256A (en) | 2010-01-15 | 2010-01-15 | Rolling and solution treatment method for 304 stainless strip steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102671939A (en) * | 2012-05-14 | 2012-09-19 | 山西太钢不锈钢股份有限公司 | Production method of 304L precise stainless steel belt |
| CN102699020A (en) * | 2012-05-14 | 2012-10-03 | 山西太钢不锈钢股份有限公司 | Production method of precise stainless steel belt for high-strength spring |
| CN113355496A (en) * | 2021-06-04 | 2021-09-07 | 东北大学 | On-line solution annealing process for rolling waste heat of stainless steel hot-rolled coil |
| CN114226462A (en) * | 2021-12-10 | 2022-03-25 | 山西太钢不锈钢股份有限公司 | Grain size control method for stainless steel extra-thick plate |
| CN114558888A (en) * | 2022-01-24 | 2022-05-31 | 东北大学 | Solution-free annealing production method for stainless steel hot-rolled steel strip |
-
2010
- 2010-01-15 CN CN201010033399A patent/CN101748256A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102671939A (en) * | 2012-05-14 | 2012-09-19 | 山西太钢不锈钢股份有限公司 | Production method of 304L precise stainless steel belt |
| CN102699020A (en) * | 2012-05-14 | 2012-10-03 | 山西太钢不锈钢股份有限公司 | Production method of precise stainless steel belt for high-strength spring |
| CN113355496A (en) * | 2021-06-04 | 2021-09-07 | 东北大学 | On-line solution annealing process for rolling waste heat of stainless steel hot-rolled coil |
| CN114226462A (en) * | 2021-12-10 | 2022-03-25 | 山西太钢不锈钢股份有限公司 | Grain size control method for stainless steel extra-thick plate |
| CN114558888A (en) * | 2022-01-24 | 2022-05-31 | 东北大学 | Solution-free annealing production method for stainless steel hot-rolled steel strip |
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Application publication date: 20100623 |