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Processing method of thread rod, bolt and nut by using dual-phase steel material

A technology of bolts and nuts, dual-phase steel, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of inability to meet, use requirements, etc., and achieve the effect of long service life, strong corrosion resistance, and high tensile strength

Inactive Publication Date: 2012-05-30
骆伟强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the processing and production industry of bolts, nuts, solid or hollow threaded rods and other widely used parts, almost no one uses duplex stainless steel for this aspect of production and processing
As a result, such components cannot meet the expected use requirements in terms of service life, tensile strength, and corrosion resistance in some harsh medium environments (such as seawater with high chloride ion content).

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0044] Utilize the dual-phase steel material of the present invention [select the dual-phase steel of 1.4362 (S32304) formula] to carry out the method for adding solid or hollow working tooth bar, its method step is as follows:

[0045] (1) For the selected dual-phase steel material [Because it is a processed tooth bar, a solid or hollow dual-phase steel round bar with a formula of 1.4362 (S32304) is generally selected; the solid dual-phase steel round bar is generally solid Tooth bar; a generally hollow tooth bar processed from a hollow duplex steel round bar. 】Annealing treatment: Put the dual-phase steel material into an annealing furnace with a temperature of 730°C in the furnace, raise the temperature to 770°C, and keep it for 12 hours; then slowly cool the temperature in the furnace to Below 650°C, take out the oven and air cool;

[0046] (2) Secondary softening treatment: put the steel obtained in step (1) into the annealing furnace again, raise the temperature in the ...

Embodiment approach 2

[0051] Utilize the dual-phase steel material of the present invention [select the dual-phase steel of 1.4362 (S32304) formula] carry out the method for processing bolt and nut, its method step is as follows:

[0052] (1) For the selected dual-phase steel materials [generally, solid dual-phase steel round bars are used to process bolts, and hollow dual-phase steel round bars are selected to process nuts; of course, original dual-phase steel coils, wire rods or Add without round tube. 】Annealing treatment: Put the dual-phase steel material into an annealing furnace with a temperature of 730°C in the furnace, raise the temperature to 770°C, and keep it for 12 hours; then slowly cool the temperature in the furnace to Below 650°C, take out the oven and air cool;

[0053] (2) Secondary softening treatment: Put the steel obtained in step (1) into the annealing furnace again, raise the temperature in the furnace to 670°C, and keep it for 10 hours; , take the secondary softening anne...

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PUM

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Abstract

The invention discloses a process method of a thread rod, a bolt and a nut by using a dual-phase steel material through the steps of annealing treatment, secondary softening treatment, thread forming treatment, quenching treatment, acid pickling treatment and the like of the dual-phase steel material approximately in sequence. The thread rod, the bolt and the nut obtained through the method have high stretching resistance, strong corrosion resistance and long service life, and can meet the using requirements of the thread rod, the bolt and the nut under harsh medium conditions. The method of the invention has simple steps and good operation repeatability, and can be widely used in the production of various specifications of thread rods, bolts and nuts with high performances.

Description

technical field [0001] The invention relates to a method for processing threaded rods, bolts and nuts using dual-phase steel materials. Background technique [0002] Duplex steel refers to duplex stainless steel. Duplex Stainless Steel (DSS for short) refers to stainless steel with ferrite and austenite each accounting for about 50%, and generally the content of lesser phases needs to reach at least 30%. Since duplex stainless steel was born in the United States in the 1940s, it has developed to the third generation. Its main feature is that the yield strength can reach 400-550MPa, which is twice that of ordinary stainless steel, so it can save materials and reduce equipment manufacturing costs. In terms of corrosion resistance, especially under the condition of harsh medium environment (such as seawater with high chloride ion content), the pitting corrosion, crevice corrosion, stress corrosion and corrosion fatigue resistance of duplex stainless steel are significantly be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00C21D9/32
Inventor 骆伟强
Owner 骆伟强