What Are Cold Rolled Stainless Steel Strips?
End users’ requirements for cold rolled stainless steel strips are becoming increasingly strict in modern days.
Unlike conventional hot rolled stainless steel strips, precision cold rolled stainless steel strips usually refer to stainless steel strips with a thickness of less than 0.30mm.
As a high-end product in the field of stainless steel materials, precision cold rolled stainless steel have excellent strength, precision, surface finish and other properties. They are widely used in heat exchangers, optical cables, hypodermic needles, diamond blades, and springs materials.
At present, the main production processes of cold rolled stainless steel strip include cold rolling, bright annealing, tension straightening and finishing.
Cold Rolled Stainless Steel Strips Rolling Process
The performance requirements of ultra-thin, high-strength and high-precision cold rolled stainless steel strips place high requirements on the rolling process.
Conventional rolling processes cannot meet the production requirements of precision cold rolled stainless steel strips. At present, Z-Mills or 20-high rolling Sendzimir Mills are basically used to produce precision stainless steel strips.
Its complete production process includes cold rolling, annealing, and finishing.
In the rolling process, please note to select the appropriate reduction system, tension system, speed system and roll shape.
In order to improve the production capacity of the rolling mill, under the premise of making full use of the main drive power of the rolling mill and the front and rear coilers, the reduction rate should be increased as much as possible to reduce the rolling passes.
Tension can reduce the rolling pressure, improve the shape of the rolling, and stabilize the rolling process. The rolling process of the 20-high rolling mill generally uses high tension.
At the same time, it should be adjusted at any time according to the shape of the plate. When there is a wave in the middle of the material, the tension should be reduced pull the edge of the belt or break the belt.
When the strip produces edge waves, the tension can be appropriately increased.
The rolling speed should be as high as possible within the allowable speed range of the rolling mill to increase the production capacity of the rolling mill.
At the same time, when the rolling speed increases, the rolling pressure is correspondingly reduced. In the first pass, a lower rolling speed is generally used.
According to the cold rolling principle, work rolls with the smallest possible diameter should be used under the maximum pressure condition.
With the goal of reducing the diameter of work rolls, multi-roll mills including 6, 12, and 20 rolls have been developed.
Among them, the 20-high rolling mill has become the first choice for the production of precision cold rolled stainless steel strips due to its high rigidity and small roll elastic deflection and deformation.
Cold Rolled Stainless Steel Strips Tension Straightening And Finishing
The finishing process of precision cold rolled stainless steel strip production mainly includes tension straightening and slitting.
After the strip is annealed, in order to obtain good plate shape, machining performance and deep drawing performance, it usually passes through a stretching and leveling unit.
Its working characteristic is to make the strip produce extension under the combined action of stretching and continuous alternating bending.
Strip steel can eliminate defects such as middle wave, quarter wave, side wave, vertical and horizontal bending through the stretching and straightening process, but the brightness is reduced by 1%.
The flatness accuracy of the finished strip after stretching and straightening can reach 1% of the incoming material flatness.
In order to cut the edge and split the wide strip stainless into finished narrow stainless steel strip, slitting machines are often used.
Today’s slitting machines have developed a lot of new technologies, such as automatic adjustment of the insertion amount of slitting tools and axial clamping; scissors quick-change system, 50% less replacement time than conventional methods.
Advantages Of Using Cold Rolled Stainless Steel Strips
The cold rolled stainless steel strip is made of hot rolled stainless steel strip coil after further cold rolling and other process.
Compared with hot rolled stainless steel strip, it has higher dimensional accuracy, low surface roughness, good surface quality, smoothness and higher strength.
Therefore, thinner cold rolled stainless steel strips can be used instead of thicker hot rolled strips for the same purpose to save the amount of steel material, which is of great economic significance.
How To Choose Cold Rolled Stainless Steel Strips Manufacturers
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