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304 stainless steel strip and production method thereof

A 304 stainless steel, stainless steel plate technology, applied in rolling mill control devices, metal rolling, manufacturing tools, etc., can solve the problem of difficult to achieve the effect of carbide solid solution, affect product surface gloss, roughness, forming performance and corrosion resistance , metallographic structure, corrosion resistance and processing performance are difficult to achieve normal stainless steel and other problems, to achieve the effect of saving natural gas consumption, reducing delta ferrite, and reducing carbon emissions

Active Publication Date: 2015-06-24
ZHANGJIAGANG POHANG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the microstructure, the above-mentioned defects are shown as fine surface hole folds, which will seriously affect the surface gloss, roughness, formability and corrosion resistance of the product.
[0005] If the same cold annealing and pickling process as the normal thermal annealed stainless steel is used to produce materials that omit thermal annealing, it is difficult to achieve the effect of thermal annealing to make carbide solid solution, in terms of metallographic structure, corrosion resistance and processing performance Difficult to reach the standard of normal stainless steel

Method used

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  • 304 stainless steel strip and production method thereof
  • 304 stainless steel strip and production method thereof
  • 304 stainless steel strip and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present embodiment provides a kind of production method of 304 stainless steel strips, and it comprises the following steps:

[0028] The hot-rolled and pickled stainless steel strip (thickness 2.700mm) obtained by pickling without annealing after hot rolling is cold-rolled, and the cold-rolling is carried out by a single-stand 20-roll reversing cold-rolling unit for 7 passes Among them, 1-5 passes use 80-mesh grinding work rolls with a roughness of 0.536 μm; 6-7 passes use 120-mesh grinding rolls with a roughness of 0.275 μm to obtain cold-rolled stainless steel plates Strip, in the cold rolling process, the reduction rate of each pass is 4-16%, the rolling force is 600-850ton, the rolling speed is 150mpm-500mpm, the entrance tension of the first pass is 10ton, and the exit tension is 50ton , the entrance tension and exit tension of the remaining passes are 50ton, and the unit tension of all passes is ≤32kg / mm 2 ;

[0029] The cold-rolled stainless steel strip is...

Embodiment 2

[0034] The present embodiment provides a kind of production method of 304 stainless steel strips, and it comprises the following steps:

[0035]The hot-rolled and pickled stainless steel strip (thickness 4.000mm) obtained by direct pickling without annealing after hot-rolling is cold-rolled, and the cold-rolling is carried out 9 passes by a single-stand twenty-roller reversing cold-rolling unit Among them, 80-mesh grinding work rolls are used for 1-7 passes, and the roughness is 0.564 μm; 120-mesh grinding rolls are used for 8-9 passes, and the roughness is 0.233 μm, and the cold-rolled stainless steel plate is obtained Strip, in the cold rolling process, the reduction rate of each pass is 4-16%, the rolling force is 600-850ton, the rolling speed is 150mpm-500mpm, the entrance tension of the first pass is 10ton, and the exit tension is 50ton , the entrance tension and exit tension of the remaining passes are 50ton, and the unit tension of all passes is ≤32kg / mm 2 ;

[0036] ...

Embodiment 3

[0041] The present embodiment provides a kind of production method of 304 stainless steel strips, and it comprises the following steps:

[0042] The hot-rolled and pickled stainless steel strip (thickness 5.0mm) obtained by direct pickling without annealing after hot rolling is cold-rolled, and the cold-rolling is carried out 7 passes by a single-stand 20-roller reversing cold-rolling unit Among them, 1-5 passes use 80-mesh grinding work rolls with a roughness of 0.552 μm; 6-7 passes use 120-mesh grinding rolls with a roughness of 0.212 μm to obtain cold-rolled stainless steel plates Strip, in the cold rolling process, the reduction rate of each pass is 4-16%, the rolling force is 600-850ton, the rolling speed is 150mpm-500mpm, the entrance tension of the first pass is 10ton, and the exit tension is 50ton , the entrance tension and exit tension of the remaining passes are 50ton, and the unit tension of all passes is ≤32kg / mm 2 ;

[0043] The cold-rolled stainless steel strip...

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Abstract

The invention provides a 304 stainless steel strip and a production method thereof. The production method includes performing cold rolling on a hot-rolled and pickled stainless steel strip which is directly pickled without anneal after hot rolling for 7 to 9 passes by a single-frame twenty-roller reversible cold rolling unit; continuously annealing the cold-rolled stainless steel strip at the temperature of 1150-1160 DEG C for 1 to 3 minutes; placing the cold-rolled and annealed stainless steel strip into a neutral salt solution to electrolyze; then placing the stainless steel strip into a mixed solution of HNO3 (nitric acid) and HF (hydrogen fluoride) to mix and pickle; and performing finishing on the cold-rolled, annealed and pickled stainless steel strip to obtain the 304 stainless steel strip. The 304 stainless steel strip is produced by the production method. In the production method, a hot annealing process is omitted, and the techniques of the cold rolling and the cold annealing are optimized, so that the produced 304 stainless steel strip can have all properties of stainless steel strips produced by conventional methods.

Description

technical field [0001] The invention relates to a 304 stainless steel strip and a production method thereof, in particular to a production method of a 304 stainless steel strip without a thermal annealing step and the produced 304 stainless steel strip, belonging to the technical field of stainless steel smelting. Background technique [0002] For a long time, the general production process of 304 stainless steel strips is continuous casting, hot rolling, hot annealing and pickling, cold rolling, cold annealing and pickling. Generally, after hot-rolling stainless steel strips, their hardness is relatively high and carbides are precipitated. The main purpose of hot annealing of 304 stainless steel strips is to dissolve carbides (solution treatment), adjust grain size, soften, reduce δ ferrite, etc. The main purpose of cold annealing is to soften the rolled work-hardened stainless steel strip through recrystallization by heating. [0003] When using the above production proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/00B21B1/32B21B27/02C21D8/02
Inventor 韦培友陈胜春
Owner ZHANGJIAGANG POHANG STAINLESS STEEL
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