Cold rolling annealing and pickling process of high chromium and high nickel stainless steel
A technology of cold rolling, annealing, pickling, and stainless steel, which is applied to the cleaning method of tools, cleaning methods and utensils, chemical instruments and methods, etc. It can solve problems such as no obvious improvement, residual iron scale on the surface, and influence on product quality. Improved removal, smooth surface and process stability
Active Publication Date: 2019-04-16
ZHANGJIAGANG POHANG STAINLESS STEEL
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, the above-mentioned conventional pickling process cannot completely remove the scale layer on the surface. After the cold annealing pickling process, the surface oxide scale remains seriously. By adjusting the proportion of neutral salt and the mixed acid composition, there is no obvious improvement trend. Due to the high chromium and high nickel stainless steel The content of chromium and nickel is high, and the resistance to pickling is extremely strong. Chemical methods cannot effectively remove the surface oxide scale, which affects product quality
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0018] Step a, material preparation: select 310S stainless steel material after cold rolling and annealing. The thickness specification of 310S stainless steel is 0.3mm to 5.0mm; the width specification is 1000mm to 1600mm. 310S stainless steel with a weight of 25Ton and after cold rolling and annealing is used as the material.
[0019] Step b, neutral salt electrolysis operation: the current is passed into the sodium sulfate solution to reduce the high-valent oxides of iron on the surface of the steel strip to low-valent oxides that are easily soluble in water, and the precipitated hydrogen is mechanically released from the inside of the iron oxide scale Destruction; the specific neutral salt electrolysis parameters are, the neutral salt used is sodium sulfate solution, the specific gravity of the solution is 1.18, the pH value of the sodium sulfate solution is 5.0, the temperature of the neutral salt solution is 75°C, the electrolysis current is 6000A, and the electrolysis ti...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| hardness | aaaaa | aaaaa |
Login to View More
Abstract
High chromium and high nickel stainless steel cold rolling annealing and pickling process, steps: a material preparation: high chromium and high nickel stainless steel strip after cold rolling and annealing; b neutral salt electrolysis: current is passed into the sodium sulfate solution, and the surface of the steel strip is The high-valent oxides of iron are reduced to low-valent oxides that are easily soluble in water. The precipitated hydrogen is mechanically destroyed from the inside of the iron oxide scale. The specific gravity of the sodium sulfate solution is 1.16~1.20, the solution temperature is 70~80℃, and the electrolysis current is 5000~6200A. , the electrolysis time is 5 to 8 minutes; c brushing: the bristles on the surface of the brush roller contact the surface of the steel strip and form a certain amount of reduction, start the brush roller drive motor, set the brush roller drive motor current, brush roller speed, brush roller drive The motor drives the brush roller to rotate at high speed; d. Mixed acid pickling: the steel strip after neutral salt electrolysis is passed into a mixed solution of nitric acid and hydrofluoric acid to remove oxides on the surface. The nitric acid concentration is 60-100g / l and the hydrofluoric acid concentration is 15 ~20g / l, the mixed acid temperature is controlled at 55~65°C, and the pickling time is 3~6Min. The invention can completely remove the iron oxide scale on the surface of the steel strip and make the surface of the steel strip smooth.
Description
technical field [0001] The invention relates to the technical field of stainless steel smelting, and more specifically, to a production technology of high-chromium and high-nickel stainless steel cold rolling, annealing and pickling. Background technique [0002] High chromium and high nickel stainless steel, such as 309S stainless steel, 310S stainless steel, 904L stainless steel, etc., are obtained through cold annealing and pickling process to obtain the final cold-rolled stainless steel products. Due to the high percentage of chromium and nickel contained in high chromium and high nickel stainless steel, it has good oxidation resistance, Corrosion resistance, acid and alkali resistance, high temperature resistance, high creep strength, continuous operation at high temperature, and good high temperature resistance. The conventional steps of the pickling process are: step a, material preparation: high-chromium and high-nickel stainless steel after cold rolling and annealin...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C25F1/06C23G1/08B08B1/02B08B1/20
CPCC23G1/086C25F1/06B08B1/20
Inventor 刘奇毅
Owner ZHANGJIAGANG POHANG STAINLESS STEEL