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Direct chromium stainless-steel pickling agent

A technology for stainless steel and pickling agent, applied in the field of chrome stainless steel pickling agent, can solve the problems of complex treatment process, unreasonable pickling agent, poor surface quality, etc., and achieve the effects of simplified treatment process, excellent protection performance and high cost

Inactive Publication Date: 2007-09-05
李青
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a chromium stainless steel in order to solve the problems that the existing pickling agent for removing scale of chromium stainless steel is unreasonable, and therefore needs to be treated with an alkali bath before pickling, resulting in complicated treatment process and poor surface quality after pickling. direct pickling agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] The direct pickling agent for chromium stainless steel has the following components and weight ratio: 45% hydrochloric acid with a concentration of 30%, 51.2% hydrofluoric acid with a concentration of 55%, and 3.8% corrosion inhibitor. The corrosion inhibitor is hexamethylenetetraammonium.

[0010] Pickling object: hot-rolled seamless steel pipe, steel type 1Cr17Mo2Ti, specification φ80mm, annealed state.

[0011] Dilute the above components and proportioned pickling agent with water to a concentration of 30% (such as 30 kg of pickling agent plus 70 kg of water), heat to 60 ° C, soak the product for 120 minutes, remove and rinse with water. The oxide skin on the surface of the product is removed and the surface is smooth and white.

Embodiment 2

[0013] The direct pickling agent for chromium stainless steel has the following components and weight ratio: 70% hydrochloric acid with a concentration of 30%, 28.5% hydrofluoric acid with a concentration of 50%, and 1.5% corrosion inhibitor. The corrosion inhibitor is hexamethylenetetraammonium.

[0014] Pickling object: cold-rolled sheet, steel type 0Cr13, specification 1.0mm, annealed state.

[0015] Dilute the above components and proportioned pickling agent with water to a concentration of 25%, heat to 55°C, soak the product for 35 minutes, remove and rinse with water. The oxide skin on the surface of the product is removed and the surface is smooth and white.

Embodiment 3

[0017] The direct pickling agent for chromium stainless steel has the following components and weight ratio: 60% hydrochloric acid with a concentration of 30%, 37% hydrofluoric acid with a concentration of 50%, and 3% corrosion inhibitor. The corrosion inhibitor adopts LK type corrosion inhibitor.

[0018] Pickling object: hot-rolled wire rod, steel type 409L (containing trace nickel elements), specification φ10mm, annealed state.

[0019] Dilute the above components and proportioned pickling agent with water to a concentration of 20%, heat to 50°C, soak the product for 60 minutes, remove and rinse with water. The oxide skin on the surface of the product is removed and the surface is smooth and white.

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Abstract

A chromium stainless steel pickling agent consists of hydrochloric acid 30-80% with concentration 30%, fluohydric acid 17.2-69.7% with concentration 50-55%, hexamethine tetramine or Rhodin or LK corrosion inhibitor 0.3-3.8%. It can remove oxide skin directly, simplify process, and have excellent protection performance for chromium stainless steel surface. The surface is clean and smooth, and it can be used for heat-treatment chromium stainless steel wire stocks, rods, sections, pipe materials, silks and mechanical work pieces.

Description

technical field [0001] The invention relates to a pickling agent for chromium stainless steel, in particular to a direct pickling agent for chromium stainless steel. Background technique [0002] Chromium stainless steels refer to ferritic and martensitic stainless steels. Chromium stainless steel forms a firm and dense oxide scale on the surface during the annealing process. The current process for removing scale (except for the continuous pickling process) is single-tank pickling by alkaline-acid method, that is, pickling with sulfuric acid after alkaline bath. There are many disadvantages in this process: the alkali bath is NaOH, NaNO at about 500°C 3 Soaking in the melt, and then quenching in water to loosen the scale. Alkaline bath will cause serious three wastes pollution, especially water explosion will produce a large amount of water vapor carrying NaOH, NaNO 3 Such harmful substances soar into the sky and fill the air, which not only causes waste, but also serio...

Claims

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Application Information

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IPC IPC(8): C23G1/04C23G1/06C23G1/08
Inventor 李青
Owner 李青
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