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Mixed-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, which is applied in the field of stainless steel surface treatment, and can solve problems such as difficult pickling

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 mixed acid pickling solution and a pickling method for 400 series stainless steel hot-rolled annealing 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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  • Mixed-acid acid washing liquid and acid washing method for 400-series stainless steel hot-rolled annealing wire

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Annealing and pickling process of 0Cr13

[0022] 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.

[0023] The pickling solution is composed of hydrochloric acid, hydrofluoric acid, corrosion inhibitor, acid mist inhibitor and water; the mass ratio of each substance is as follows: hydrochloric acid 22wt%, hydrofluoric acid 0.1wt%, corrosion inhibitor -1wt%, acid mist inhibitor The addition amount is 0.5wt%, and the balance is water; the corrosion inhibitor is an equal mass mixture of urotropine, quaternary ammonium salt, and sodium nitrite; the acid mist inhibitor is sodium dodecylsulfonate.

[0024] 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 30 minutes, rinse and wash after pickl...

Embodiment 2

[0027] Annealing and pickling process of 1Cr13

[0028] The main component of 1Cr13, C content <0.15%, Cr content 13%, Si content 0.5%. The specification of the wire is 5.5mm-42mm, and the high temperature annealing temperature is 860-920℃.

[0029] The pickling solution is composed of hydrochloric acid, hydrofluoric acid, corrosion inhibitor, acid mist inhibitor and water; The addition amount of the inhibitor is 0.1wt%, and the balance is water; the corrosion inhibitor is an equal mass mixture of urotropine, thiourea and sodium benzoate; the acid mist inhibitor is sodium dodecylsulfonate, benzenesulfonate , Equal mass mixture of fatty alcohol polyoxyethylene ether.

[0030] Pickling process: inject the pickling liquid into the pickling tank, put the whole annealed hot-rolled wire rod directly into the pickling tank for pickling, the pickling temperature is 70°C, the pickling time is 40min, rinse and wash after pickling Neutralize and store after drying.

[0031] The surfa...

Embodiment 3

[0033] Annealing and pickling process of 0Cr17

[0034] 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 780-820°C.

[0035] The pickling solution is composed of hydrochloric acid, hydrofluoric acid, corrosion inhibitor, acid mist inhibitor and water; the mass ratio of each substance is as follows: hydrochloric acid 17wt%, hydrofluoric acid 1.2wt%, corrosion inhibitor-0.05wt%, acid The amount of mist inhibitor added is 0.25wt%, and the balance is water; the corrosion inhibitor is an equal mass mixture of thiourea, sodium benzoate and citric acid; the acid mist inhibitor is sodium dodecylsulfonate, fatty alcohol polyoxyethylene Equal mass mixtures of ethers.

[0036] 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 65°C, the pickli...

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Abstract

The invention relates to a mixed-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, hydrofluoric acid, a corrosion inhibitor, an acid mist inhibitor and water. The acid washing liquid comprises the substances at a mass ratio as follows: 8wt%-22wt% of hydrochloric acid, 0.1wt%-2wt% of hydrofluoric acid, 0.01wt%-1wt% of the corrosion inhibitor, 0.1wt%-0.5wt% of an acid mist inhibitor 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 10-40 min. The treated wire rod surface is clean, white and bright, oxide scale residues are avoided, and a wire rod can be normally used and stored without follow-up passivation.

Description

technical field [0001] The invention belongs to the technical field of stainless steel surface treatment, and in particular relates to a mixed-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 annealed ...

Claims

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Application Information

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IPC IPC(8): C23G1/08C23G1/06
Inventor 王宁涛翟进坡王郢田新中张治广冯忠贤陈继林贾育华王笑丹李军孙增淼赵虎张建周
Owner XINGTAI IRON & STEEL
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