Cold rolling for 2B surface of 439 ferrite stainless steel

A stainless steel and ferrite technology, applied in metal rolling, metal rolling, rolling force/roll gap control, etc., can solve problems such as white striped titanium stripe defects, reduce emissions, reduce environmental protection burden, surface Bright and uniform effect

Active Publication Date: 2020-02-21
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a 2B surface 439 ferritic stainless steel cold rolling method to solve the problem of white strip titanium stripe defects on the cold rolled 2B surface

Method used

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  • Cold rolling for 2B surface of 439 ferrite stainless steel
  • Cold rolling for 2B surface of 439 ferrite stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1. Hot-wire annealing and pickling: The 439 ferritic stainless steel hot-rolled coil produced by the conventional process is subjected to continuous annealing and pickling to obtain a cold-rolled base material with a thickness of 4.75mm. Among them, (1) annealing: the annealing temperature is 950°C, and the annealing time is 2.5min; (2) sulfuric acid pickling: the sulfuric acid concentration is 300g / L, the sulfuric acid temperature is 75°C, and the pickling time is 1.0min; (3) mixed acid Pickling: Nitric acid and hydrofluoric acid are used for mixed acid, the concentration of nitric acid is 90g / L, the concentration of hydrofluoric acid is 20g / L, the temperature of mixed acid is 45°C, and the pickling time is 2.0min.

[0029] Step 2, cold-rolling mill rolling: use the cold-rolling mill to roll the cold-rolled base material obtained in step 1 for 11 passes, and the rolling reduction rate is controlled at 74.7%, to obtain a hard-rolled steel coil with a final thickness...

Embodiment 2

[0035] Step 1. Hot-wire annealing and pickling: The 439 ferritic stainless steel hot-rolled coil produced by the conventional process is continuously annealed and pickled to obtain a cold-rolled base material, and the thickness of the cold-rolled base material is 6.0mm. Among them, (1) annealing: the annealing temperature is 1000°C, and the annealing time is 3.0min; (2) sulfuric acid pickling: the sulfuric acid concentration is 250g / L, the sulfuric acid temperature is 70°C, and the pickling time is 1.5min; (3) mixed acid Pickling: Nitric acid and hydrofluoric acid are used for mixed acid, the concentration of nitric acid is 80g / L, the concentration of hydrofluoric acid is 15g / L, the temperature of mixed acid is 40°C, and the pickling time is 2.5min.

[0036] Step 2, cold-rolling mill rolling: use the cold-rolling mill to roll the cold-rolled base material obtained in step 1 for 5 passes, and the rolling reduction rate is controlled at 50.0%, to obtain a hard-rolled steel coil w...

Embodiment 3

[0041]Step 1. Hot-wire annealing and pickling: The 439 ferritic stainless steel hot-rolled coil produced by the conventional process is continuously annealed and pickled to obtain a cold-rolled base material, and the thickness of the cold-rolled base material is 3.0mm. Among them, (1) annealing: the annealing temperature is 900°C, and the annealing time is 2.0min; (2) sulfuric acid pickling: the sulfuric acid concentration is 350g / L, the sulfuric acid temperature is 80°C, and the pickling time is 0.5min; (3) mixed acid Pickling: Nitric acid and hydrofluoric acid are used for mixed acid, the concentration of nitric acid is 100g / L, the concentration of hydrofluoric acid is 25g / L, the temperature of mixed acid is 50°C, and the pickling time is 1.5min.

[0042] Step 2, cold-rolling mill rolling: use the cold-rolling mill to roll the cold-rolled base material obtained in step 1 for 13 passes, and the rolling reduction rate is controlled at 86.7%, to obtain a hard-rolled steel coil w...

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Abstract

The invention discloses a cold rolling method of a 2B surface of 439 ferrite stainless steel, and belongs to the field of stainless steel surface treatment. The problem that a white strip-shaped titanium stripe defect exists on the surface of a cold rolling 2B surface exists is solved. The cold rolling method comprises the following steps of 1, hot wire annealing acid washing; 2, rolling by a coldrolling mill; 3, cold line annealing acid washing; and 4, online flattening. In the step 1, a neutral salt electrolytic plus nitric acid electrolysis and low-concentration mixed acid pickling technology is adopted by the cold rolling method, the annealed strip steel is treated through a reasonable acid pickling method to obtain the cold rolled 2B surface with high surface quality requirement. The2B surface obtained by the cold rolling method is completely different from the 2B surface obtained by a traditional method, the surface is bright and uniform, white strip-shaped titanium stripe defects are avoided, high corrosion resistance and high surface quality are met, and the use requirements in the field of decorative panels are met. The low-concentration mixed acid pickling technology isadopted by the cold rolling method, so that the emission of nitrogen oxides can be greatly reduced, and the environmental protection burden is reduced.

Description

technical field [0001] The invention belongs to the field of stainless steel surface treatment, and in particular relates to a cold rolling method of 439 ferritic stainless steel on a 2B surface. Background technique [0002] Due to the extremely low C and N content of 439 ferritic stainless steel and the addition of about 0.3% of stable element Ti, 439 ferritic stainless steel has excellent corrosion resistance and replaces the current conventional 304 and 430 steel types in many fields. Because 439 steel contains 0.3% Ti, there are white strips of titanium stripe defects on the surface of cold-rolled 2B. Such defects seriously affect the appearance and seriously restrict its use in the field of decorative panels. Contents of the invention [0003] The purpose of the present invention is to provide a method for cold-rolling 439 ferritic stainless steel on the surface of 2B to solve the problem of white strip titanium stripe defects on the surface of cold-rolled 2B. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B3/02B21B37/58B21B15/00C21D1/26C21D9/52C23G1/08C23G3/02C25F1/06
CPCB21B3/02B21B15/00B21B37/58B21B2015/0071C21D1/26C21D9/52C23G1/081C23G1/086C23G3/02C25F1/06
Inventor 陈安忠任娟红王长波惠恺王军伟李照国李玉峰
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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