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A treatment process for corrosion-resistant seamless steel pipe

A seamless steel pipe and processing technology technology, which is applied in the field of surface treatment technology of special steel pipes for motor vehicle parts, can solve the problems of unstable quality, surface corrosion of pipe fittings, shortening service life of vehicle parts and pipes, etc.

Inactive Publication Date: 2016-11-30
泰州双马节能科技有限公司
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Problems solved by technology

[0002] At present, the existing production technology for special steel pipes for motor vehicles usually adopts the method of electroplating hard chromium to improve the corrosion resistance. Although electroplating hard chromium can meet the general anti-corrosion requirements, when it is rated according to the national standard (GB / T10125 and 6461), The standard of hard chrome plating treatment is 3-6, and the quality is unstable, especially in coastal areas, due to the humid climate and salt content, after six months of use, the surface of some pipe fittings will be severely corroded, thus shortening the length of the parts. Therefore, how to improve the corrosion resistance of steel pipes for motor vehicles through physical or chemical treatment in the process of making pipe fittings has become an urgent problem to be solved.

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Embodiment Construction

[0032] A treatment process for corrosion-resistant seamless steel pipes, the process comprising the steps of:

[0033] Step 1: tube blank forming treatment;

[0034] The solid tube billet made of carbon steel or alloy steel is pierced by a piercer, rolled into a hollow thick-walled capillary tube, processed into an ordinary seamless tube by cold drawing, and then rolled into a precision seamless tube by a finishing mill. After the seam steel pipe is cut into the length of the pipe for the car part, it is made into a semi-finished car part pipe (pipe material before plating) through straightening, grinding, turning and other processes.

[0035] Step 2: cleaning treatment;

[0036] First, the liquid distribution tank, the cleaning pump and the equipment to be cleaned form a cleaning loop system; secondly, the descaling cleaning agent is configured, and the cleaning is controlled by an automatic program, and the cleaning cycle is cyclically cleaned, and the pipe material is degr...

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Abstract

The invention relates to a treatment process for corrosion-resistant seamless steel pipes. The process adopts tube blank forming treatment, cleaning treatment, pipe material electroplating nickel treatment, chrome plating treatment and secondary inspection, nickel electroplating on the pipe material surface, plating solution The formula is: nickel sulfate 290-300 g / l, nickel chloride 43-45 g / l, boric acid 42-45 g / l, using a current of 1200A for 3 minutes, and a current of 2400A for 5 minutes After adopting the above method, it can be obtained that the excellent performance of the salt spray test ≥ 7 grades can be reached stably, which meets the requirements for the use of special steel pipes for motor vehicle parts in coastal areas. Great technological progress has improved the corrosion resistance of motor vehicle parts.

Description

technical field [0001] The invention relates to seamless steel pipes, in particular to a surface treatment process for special steel pipes for motor vehicle parts. Background technique [0002] At present, the existing production technology for special steel pipes for motor vehicles usually adopts the method of electroplating hard chromium to improve the corrosion resistance. Although electroplating hard chromium can meet the general anti-corrosion requirements, when it is rated according to the national standard (GB / T10125 and 6461), The standard of hard chrome plating treatment is 3-6, and the quality is unstable, especially in coastal areas, due to the humid climate and salt content, after six months of use, the surface of some pipe fittings will be severely corroded, thus shortening the length of the parts. Therefore, how to improve the corrosion resistance of steel pipes for motor vehicles through physical or chemical treatment in the process of making pipe fittings has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/12C25D7/04C23G3/04B21C37/06B08B3/12
Inventor 卞再明卞再祥黄卫国高松山
Owner 泰州双马节能科技有限公司
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