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Hydrochloric-acid acid washing liquid and acid washing method for 400-series stainless steel hot-rolled annealing wire

A technology of stainless steel and pickling solution, applied in the field of stainless steel surface treatment, can solve the problem of not easy pickling, and achieve the effect of stable pickling process and smooth and white surface

Active Publication Date: 2015-05-13
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, for annealing materials, especially the problem that it is not easy to be pickled during high-temperature annealing, the present invention proposes a hydrochloric acid pickling solution and a pickling method for 400 series stainless steel hot-rolled annealed wire rods. After washing, the surface is white and beautiful, and there is no phenomenon of over-pickling or under-pickling

Method used

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  • Hydrochloric-acid acid washing liquid and acid washing method for 400-series stainless steel hot-rolled annealing wire

Examples

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Effect test

Embodiment 1

[0024] Annealing and pickling process of 0Cr13

[0025] The main components of 0Cr13: C content <0.05%, Cr content 13%, Si content 0.5%. The specification of the wire is 5.5mm-42mm, and the annealing temperature is 700-800°C.

[0026] The pickling solution is composed of hydrochloric acid, nitric acid, corrosion inhibitor, surfactant, accelerator, solution stabilizer and water; the mass ratio of each substance is as follows: hydrochloric acid 22wt%, nitric acid 10wt%, corrosion inhibitor 1wt%, surface active 0.05wt% agent, 1wt% accelerator, 0.05wt% solution stabilizer, and the balance is water; the corrosion inhibitor is an equal mass mixture of urotropine and quaternary ammonium salt; the surfactant is sodium alkylbenzenesulfonate; The accelerator is hydrogen peroxide; the solution stabilizer is EDTA.

[0027] Pickling process: inject the pickling solution into the pickling tank, put the whole annealed hot-rolled wire rod directly into the pickling tank for pickling, the pi...

Embodiment 2

[0030] Annealing and pickling process of 1Cr13

[0031] The main component of 1Cr13, C content <0.15%, Cr content 13%, Si content 0.5%. The specification of the wire rod is 5.5mm-42mm, and the annealing temperature is 700-850°C.

[0032] The pickling solution is composed of hydrochloric acid, nitric acid, corrosion inhibitor, surfactant, accelerator, solution stabilizer and water; Active agent 1wt%, Accelerator 0.05wt%, Solution stabilizer 1wt%, The balance is water; Corrosion inhibitor is a mass mixture of urotropine, thiourea and citric acid; Surfactant is sodium alkylsulfonate; The accelerator is sodium fluoride; the solution stabilizer is disodium EDTA.

[0033] Pickling process: inject the pickling solution into the pickling tank, put the entire annealed hot-rolled wire rod directly into the pickling tank for pickling, the pickling temperature is 85°C, the pickling time is 0.5h, and rinse after pickling And neutralization, hot air can be stored after drying.

[0034] ...

Embodiment 3

[0036] Annealing and pickling process of 0Cr17

[0037] The main component of 0Cr17, C content <0.05%, Cr content 17%, Si content 0.5%. The specification of the wire is 5.5mm-42mm, and the annealing temperature is 700-820°C.

[0038]The pickling solution is composed of hydrochloric acid, nitric acid, corrosion inhibitor, surfactant, accelerator, solution stabilizer and water; the mass ratio of each substance is as follows: hydrochloric acid 16wt%, nitric acid 0.01wt‰, corrosion inhibitor 0.01wt%, Surfactant 0.6wt%, accelerator 0.7wt%, solution stabilizer 0.35wt%, the balance is water; corrosion inhibitor is equal mass mixture of thiourea, quaternary ammonium salt and citric acid; surfactant is OP-10 The accelerator is sodium fluoride; the solution stabilizer is disodium EDTA.

[0039] Pickling process: inject the pickling solution into the pickling tank, put the whole annealed hot-rolled wire rod directly into the pickling tank for pickling, the pickling temperature is 65°C,...

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Abstract

The invention relates to a hydrochloric-acid acid washing liquid and an acid washing method for a 400-series stainless steel hot-rolled annealing wire. The acid washing liquid comprises hydrochloric acid, nitric acid, a corrosion inhibitor, a surface active agent, an accelerant, a solution stabilizer and water. The acid washing liquid comprises the substances at a mass ratio as follows: 8wt%-22wt% of hydrochloric acid, 0.01wt%-10wt% of nitric acid, 0.01wt%-1wt% of the corrosion inhibitor, 0.05wt%-1wt% of the surface active agent, 0.05wt%-1wt% of the accelerant, 0.05wt%-1wt% of the solution stabilizer and the balance of water. The acid washing method comprises steps as follows: the acid washing liquid is injected to an acid washing tank, the whole coil of the hot-rolled wire after annealing is directly placed in the acid washing tank for acid washing, the acid washing temperature is in a range from 45 DEG C to 85 DEG C, and the acid washing time is 0.5-2 h. The treated wire rod surface is clean, white and bright, oxide scale residues are avoided, the acid washing process is stable, the surface is slightly frosted and suitable for wire drawing, and a follow-up passivation process can be omitted.

Description

technical field [0001] The invention belongs to the technical field of stainless steel surface treatment, and in particular relates to a hydrochloric acid pickling solution and a pickling method for 400 series stainless steel hot-rolled annealed wire rods. Background technique [0002] 400 series wire rod refers to the wire rod with a C content of 0.001-0.4%, a Cr content of 12-18.5%, a manganese content of about 0.5%, a silicon content of 0.5-2%, and the sum of other elements below 1%. It is equivalent to 0Cr13, 0Cr17, 1Cr13, 1Cr17 and other steel types in the national standard. This type of steel does not contain or contain a small amount of nickel. After annealing, the surface oxide scale is very dense, and the conventional pickling method cannot effectively remove the oxide scale. It is very easy to over-pickling when using nitric acid and hydrofluoric acid pickling methods such as 304 steel grades, leaving pitting holes on the surface. Therefore, the pickling of the an...

Claims

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Application Information

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IPC IPC(8): C23G1/08C23G1/06
CPCC23G1/04C23G1/065C23G1/085
Inventor 王宁涛翟进坡王郢田新中张治广王利军冯忠贤贾育华张荣兴孙增淼安敬涛赵广兴张建周
Owner XINGTAI IRON & STEEL
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