CN114277234A - Cold rolling process of special 304 stainless steel 2B base material for elevator decoration panel - Google Patents
Cold rolling process of special 304 stainless steel 2B base material for elevator decoration panel Download PDFInfo
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- CN114277234A CN114277234A CN202111545079.2A CN202111545079A CN114277234A CN 114277234 A CN114277234 A CN 114277234A CN 202111545079 A CN202111545079 A CN 202111545079A CN 114277234 A CN114277234 A CN 114277234A
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Abstract
The invention particularly relates to a cold rolling process of a special 304 stainless steel 2B base material for an elevator decoration panel, which is implemented by controlling selection of raw material blanksSelecting, controlling roughness, controlling raw material components, improving the raw material impurities appearing on the surface in the subsequent cold rolling process, limiting the rolling mill pass reduction rate in the cold rolling process, changing the roller roughness of different rolling passes, controlling the surface roughness, improving white points generated after polishing of finished products caused by uneven raw material roughness, adjusting the annealing temperature in the cold line process, crushing crystal grains after rolling, recombining the uniformity of the crystal grains, and optimizing H2SO4And HF concentration, and optimization of three cold rolling processes are combined, so that the final 2B base material has low surface roughness, extremely low defect coverage rate, uniform and fine strip steel surface, and the 304 stainless steel 2B plate with excellent grinding and polishing performance can directly replace a 304 stainless steel BA plate and be used as a base material of a decoration panel with higher surface requirement.
Description
Technical Field
The invention particularly relates to a cold rolling process of a special 304 stainless steel 2B base material for an elevator decoration panel.
Background
The austenitic stainless steel 304 has the advantages of high plasticity, corrosion resistance, good welding performance, low-temperature toughness, easy processing and the like, so that the austenitic stainless steel 304 is widely applied to the fields of chemical industry, food, daily furniture decoration, building decoration and the like, at present, 304 stainless steel base materials for high-end elevator panels are mostly processed by adopting BA plates, but the BA plate production process is complex, a special bright annealing furnace is needed, the production cost is high, 304 stainless steel 2B plates produced by the common process are used as materials and can be used after deep processing and grinding, but after grinding and polishing are finished, the defects of a large number of pockmarks and orange peel grains exist on the plate surface, the surface quality of the mirror plate is influenced, in order to obtain high resolution ratio, repeated grinding and polishing are carried out, the production efficiency is not only reduced, but also the corresponding production cost is increased.
At present, the decorative plate material achieves the purposes of improving the purity of molten steel and reducing metallurgical defects mainly through component design and a pure steel smelting process in the molten steel smelting process and combining the selection of raw materials, although the metallurgical defects are one aspect of generation of sand hole pockmark defects in the grinding and polishing process of austenitic stainless steel, the influence of the change of the surface roughness of the strip steel in the cold rolling production link on the grinding and polishing performance is not considered in the above modes, and the influence of the change of the surface roughness of the cold rolling strip steel on the grinding and polishing performance is found to be larger in the actual processing production, so that the cold rolling process related to the invention aims to improve the surface roughness of the cold rolling strip steel so as to improve the grinding and polishing performance of the 2B surface of the austenitic stainless steel.
At present, 4-foot and narrower stainless steel belts are mainly circulated in the market as elevator plate materials, and the 4-foot materials have high cost consumption and low yield in the production process.
Disclosure of Invention
The invention aims to provide a cold rolling process of a 304 stainless steel 2B base material special for an elevator decoration panel aiming at the defects of the prior art so as to achieve the purposes of saving energy, reducing production cost and improving the use yield.
The technical scheme for realizing the cold rolling process of the 304 stainless steel 2B base material special for the elevator decoration panel is as follows: a cold rolling process of a special 304 stainless steel 2B base material for an elevator decoration panel specifically comprises the following steps:
the method comprises the following steps: selecting raw materials, wherein the raw materials comprise, by mass, 0.035-0.06% of carbon, less than or equal to 0.70% of silicon, 1.0-1.4% of manganese, less than or equal to 0.040% of phosphorus, less than or equal to 0.005% of sulfur, 18-20% of chromium, 8.0-10.50% of nickel, less than or equal to 0.06% of nitrogen, less than or equal to 0.3% of copper, and the balance of iron;
step two: placing the blank material into a steelmaking furnace for steelmaking, discharging an intermediate blank after the steelmaking is finished, and controlling the roughness Ra of the intermediate blank to be less than 3.0 mu m;
step three: in the cold rolling process, the intermediate blank is subjected to three-pass low reduction, so that the uniformity of surface grains is improved, the rolling coverage of raw materials is improved, and white spots are avoided in the grinding process of a finished product;
step four: annealing process, annealing the hard coil after cold rolling, finally obtaining the annealed stainless steel;
step five: the pickling process is to pickle the stainless steel annealed in the fourth step by adopting a continuous pickling process of neutral salt electrolysis-mixed acid pickling to obtain pickled stainless steel;
step six: and (4) a flattening process, namely performing online flattening on the stainless steel subjected to the pickling in the step five, wherein the elongation is controlled to be 0.2%, and the smooth surface and the flat plate surface are achieved.
Further, in the third step, the three times of small reduction is performed by 5%, the rolling force is controlled to be 300KN, the roughness Ra of the working roll is controlled to be 0.5 mu m in the previous discharging time, the roughness Ra of the working roll is controlled to be 0.16 mu m in the discharging time, the speed of discharging rolling is limited to be 200m/min, and the flow rate of rolling oil is controlled to be 6500L/H.
Further, in the fourth step, the temperature of the hard coil before annealing is 1150 ℃, two steps of air cooling are firstly carried out, the temperature of the hard coil after the first section of air cooling is 480 ℃, the temperature of the hard coil after the second section of air cooling is 120 ℃, the temperature of the hard coil after fog cooling is 45 ℃, and the cooling rate is 10.5.
Further, in the fifth step, a two-stage acid washing process of neutral salt electrolysis and mixed acid washing is adopted, wherein the medium of a neutral salt electrolysis section is Na2SO4The concentration is 180g/l, the current is 4500A, and the medium of the mixed acid pickling section is H2SO4And HF, wherein H2SO4Has a concentration of 60g/l and a concentration of HF of 30 g/l.
The invention has the beneficial effects that: the method comprises the steps of controlling raw material blank selection, controlling roughness and raw material composition, improving raw material impurities appearing on the surface in the subsequent cold rolling process, limiting the rolling reduction rate of the rolling mill in the previous pass in the cold rolling process, changing the roughness of the roller in different rolling passes, controlling the surface roughness, improving white points generated after grinding of finished products caused by uneven raw material roughness, adjusting the annealing temperature in the cold line process, crushing crystal grains after rolling, recombining the uniformity of the crystal grains, and optimizing H2SO4HF concentration, and optimization of three cold rolling processes, the final 2B base material has low surface roughness, extremely little defect coverage rate, uniform and fine strip steel surface and excellent grinding and polishing performance, the 304 stainless steel 2B plate can directly replace a 304 stainless steel BA plate and is used as a base material of a decoration panel with higher surface requirement, and the production process is not higher than that of 304The process of the steel BA plate is simple, the production cost is reduced, the processing efficiency is improved, 5-foot ultra-wide precise stainless steel belt is selected as the material of the invention, the consumption cost of manpower and material resources is reduced in the whole production and processing process compared with 4-foot stainless steel belt, the finished product use yield is improved, and the high efficiency of saving energy, saving cost and improving the utilization rate is achieved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b): a cold rolling process of a special 304 stainless steel 2B base material for an elevator decoration panel specifically comprises the following steps:
the method comprises the following steps: selecting raw materials, wherein the raw materials comprise, by mass, 0.035-0.06% of carbon, less than or equal to 0.70% of silicon, 1.0-1.4% of manganese, less than or equal to 0.040% of phosphorus, less than or equal to 0.005% of sulfur, 18-20% of chromium, 8.0-10.50% of nickel, less than or equal to 0.06% of nitrogen, less than or equal to 0.3% of copper, and the balance of iron;
step two: placing the blank material into a steelmaking furnace for steelmaking, discharging an intermediate blank after the steelmaking is finished, and controlling the roughness Ra of the intermediate blank to be less than 3.0 mu m;
step three: in the cold rolling process, the intermediate blank is subjected to three-pass low reduction, so that the uniformity of surface grains is improved, the rolling coverage of raw materials is improved, and white spots are avoided in the grinding process of a finished product;
step four: annealing process, annealing the hard coil after cold rolling, finally obtaining the annealed stainless steel;
step five: the pickling process is to pickle the stainless steel annealed in the fourth step by adopting a continuous pickling process of neutral salt electrolysis-mixed acid pickling to obtain pickled stainless steel;
step six: and (4) a flattening process, namely performing online flattening on the stainless steel subjected to the pickling in the step five, wherein the elongation is controlled to be 0.2%, and the smooth surface and the flat plate surface are achieved.
In the third step, the three steps of small reduction are performed by 5%, the rolling force is controlled to be 300KN, the roughness Ra of the working roll is controlled to be 0.5 mu m in the previous step of discharging, the roughness Ra of the working roll is controlled to be 0.16 mu m in the next step of discharging, the speed of discharging rolling is limited to 200m/min, and the flow rate of rolling oil is controlled to be 6500L/H.
In the fourth step, the temperature of the hard coil before annealing is 1150 ℃, two steps of air cooling are firstly carried out, the temperature of the hard coil after the first section of air cooling is 480 ℃, the temperature of the hard coil after the second section of air cooling is 120 ℃, the temperature of the hard coil after the fog cooling is 45 ℃, and the cooling rate is 10.5.
In the fifth step, a two-stage acid washing process of neutral salt electrolysis and mixed acid washing is adopted, wherein the medium of a neutral salt electrolysis section is Na2SO4The concentration is 180g/l, the current is 4500A, and the medium of the mixed acid pickling section is H2SO4And HF, wherein H2SO4Has a concentration of 60g/l and a concentration of HF of 30 g/l.
The invention has the beneficial effects that: the method comprises the steps of controlling raw material blank selection, controlling roughness and raw material composition, improving raw material impurities appearing on the surface in the subsequent cold rolling process, limiting the rolling reduction rate of the rolling mill in the previous pass in the cold rolling process, changing the roughness of the roller in different rolling passes, controlling the surface roughness, improving white points generated after grinding of finished products caused by uneven raw material roughness, adjusting the annealing temperature in the cold line process, crushing crystal grains after rolling, recombining the uniformity of the crystal grains, and optimizing H2SO4And HF concentration, the optimization of the three cold rolling processes is combined, the final 2B base material has low surface roughness and extremely small defect coverage rate, the surface of the strip steel is uniform and fine, the 304 stainless steel 2B plate with excellent grinding and polishing performance can directly replace a 304 stainless steel BA plate and is used as a base material of a decoration panel with higher surface requirement, the production process is simpler than that of the 304 stainless steel BA plate, the production cost is reduced, the processing efficiency is improved, the material of the invention adopts 5-square ultra-wide precise stainless steel strip to reduce the consumption cost of manpower and material resources in the whole production and processing process compared with 4-square stainless steel strip, and a finished product is used to form the finished productThe material rate is improved, and the high efficiency of saving energy, saving cost and improving the utilization rate is achieved.
Claims (4)
1. The cold rolling process of the 304 stainless steel 2B base material special for the elevator decoration panel is characterized by comprising the following steps of: the method specifically comprises the following steps:
the method comprises the following steps: selecting raw materials, wherein the raw materials comprise, by mass, 0.035-0.06% of carbon, less than or equal to 0.70% of silicon, 1.0-1.4% of manganese, less than or equal to 0.040% of phosphorus, less than or equal to 0.005% of sulfur, 18-20% of chromium, 8.0-10.50% of nickel, less than or equal to 0.06% of nitrogen, less than or equal to 0.3% of copper, and the balance of iron;
step two: placing the blank material into a steelmaking furnace for steelmaking, discharging an intermediate blank after the steelmaking is finished, and controlling the roughness Ra of the intermediate blank to be less than 3.0 mu m;
step three: in the cold rolling process, the intermediate blank is subjected to three-pass low reduction, so that the uniformity of surface grains is improved, the rolling coverage of raw materials is improved, and white spots are avoided in the grinding process of a finished product;
step four: annealing process, annealing the hard coil after cold rolling, finally obtaining the annealed stainless steel;
step five: the pickling process is to pickle the stainless steel annealed in the fourth step by adopting a continuous pickling process of neutral salt electrolysis-mixed acid pickling to obtain pickled stainless steel;
step six: and (4) a flattening process, namely performing online flattening on the stainless steel subjected to the pickling in the step five, wherein the elongation is controlled to be 0.2%, and the smooth surface and the flat plate surface are achieved.
2. The cold rolling process of the 304 stainless steel 2B base material special for the elevator decoration panel as claimed in claim 1, characterized in that: in the third step, the three steps of small reduction are performed by 5%, the rolling force is controlled to be 300KN, the roughness Ra of the working roll is controlled to be 0.5 mu m in the previous step of discharging, the roughness Ra of the working roll is controlled to be 0.16 mu m in the next step of discharging, the speed of discharging rolling is limited to 200m/min, and the flow rate of rolling oil is controlled to be 6500L/H.
3. The cold rolling process of the 304 stainless steel 2B base material special for the elevator decoration panel as claimed in claim 1, characterized in that: in the fourth step, the temperature of the hard coil before annealing is 1150 ℃, two steps of air cooling are firstly carried out, the temperature of the hard coil after the first section of air cooling is 480 ℃, the temperature of the hard coil after the second section of air cooling is 120 ℃, the temperature of the hard coil after the fog cooling is 45 ℃, and the cooling rate is 10.5.
4. The cold rolling process of the 304 stainless steel 2B base material special for the elevator decoration panel as claimed in claim 1, characterized in that: in the fifth step, a two-stage acid washing process of neutral salt electrolysis and mixed acid washing is adopted, wherein the medium of a neutral salt electrolysis section is Na2SO4The concentration is 180g/l, the current is 4500A, and the medium of the mixed acid pickling section is H2SO4And HF, wherein H2SO4Has a concentration of 60g/l and a concentration of HF of 30 g/l.
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| CN202111545079.2A CN114277234A (en) | 2021-12-16 | 2021-12-16 | Cold rolling process of special 304 stainless steel 2B base material for elevator decoration panel |
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| CN202111545079.2A CN114277234A (en) | 2021-12-16 | 2021-12-16 | Cold rolling process of special 304 stainless steel 2B base material for elevator decoration panel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354255A (en) * | 2022-07-12 | 2022-11-18 | 江苏甬金金属科技有限公司 | Stainless steel strip with hot-dip galvanized aluminum alloy coating and preparation method thereof |
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2021
- 2021-12-16 CN CN202111545079.2A patent/CN114277234A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354255A (en) * | 2022-07-12 | 2022-11-18 | 江苏甬金金属科技有限公司 | Stainless steel strip with hot-dip galvanized aluminum alloy coating and preparation method thereof |
| CN115354255B (en) * | 2022-07-12 | 2024-02-02 | 江苏甬金金属科技有限公司 | Stainless steel strip with hot-dip zinc-aluminum alloy coating and preparation method thereof |
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