A kind of catalytic pickling solution and pickling method for 400 series stainless steel annealing wire

Abstract

The invention discloses a 400-series stainless steel annealing wire catalytic pickling solution and a pickling method and belongs to the technical field of iron-steel surface treatment. The pickling solution comprises, by mass, 10-18% of concentrated sulfuric acid with the concentration being 98%, 2.0-4.0% of sodium fluoride, 3.0-5.0% of potassium peroxodisulfate, 1.0-1.5% of ethylene diamine tetraacetic acid (EDTA), 0.1-0.3% of urotropine, 0.3-0.5% of sodium chloride, 0.05-0.1% of lauryl sodium sulfate and the balance water. The pickling method comprises the steps that the prepared pickling solution is injected into a pickling tank; a stainless steel annealing wire is directly immersed into the pickling solution to be pickled, the pickling temperature is 60-80 DEG C, and the pickling time is 30-50 minutes; and after pickling is finished, the stainless steel annealing wire is taken out and flushed with water. By the adoption of the 400-series stainless steel annealing wire catalytic pickling solution and the pickling method, oxide scales on the surface of 400-series stainless steel can be removed efficiently, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of steel surface treatment, and in particular relates to a catalytic pickling liquid formula and a pickling method for 400 series stainless steel annealed wire rods. Background technique [0002] In the process of 400 series stainless steel being hot-rolled into plates or wires from steel billets, since stainless steel generally contains alloying elements such as chromium, nickel, silicon, titanium, molybdenum, and aluminum in addition to iron, these elements are oxidized at high temperatures. The properties of the generated oxides are different from those of iron oxides, which makes the composition and structure of the oxide scale on the surface of stainless steel oxidized complicated. If there is spinel-type FeO·Cr 2 o 3 (FeCr 2 ) or Fe 2 o 3 ·Cr 2 o 3 etc., the thickness and number of layers of oxide scale are also more than ordinary carbon steel. The removal of traditional stainless steel oxide s...

AI Technical Summary

Problems solved by technology

[0006] 2) The sodium hydride reagent used in this treatment technology is extremely unstable and is a high-risk chemical. It is necessary to order the corresponding patented stabilizer from Japan

Reagents are completely imported from abroad, the price is high and the supply is unstable; at the same time, there are great safety hazards in transportation, use, storage, etc., which need to be strictly controlled, so as to improve production capacity, reduce energy consumption and cost per ton of steel, etc. are greatly restricted

In addition, the problems of high energy consumption and high pollution also seriously plague the relevant enterprises, which are great obstacles to reducing the production cost of stainless steel products and improving competitiveness

[0007] 3) The treatment process consumes energy, and the treatment temperature is as high as 350 degrees Celsius. Due to the poor stability of sodium hydride, there are corresponding safety hazards. Even in the case of non-production, the temperature must be maintained. It is estimated that the monthly cost will be 300,000-400,000. Yuan cost

[0008] 4) Since the sodium hydride reagent itself is completely dependent on imports, the stainless steel company has no independent intellectual property rights and may encounter foreign technical barriers at any time

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