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Composite heat treatment method for 30CrMnSiA steel thin wall spinning cylinder-shape element

A composite heat treatment and thin-walled technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., to achieve the effect of improving tissue stability and machinability, and solving high processing accuracy and hydraulic strength requirements

Inactive Publication Date: 2008-09-17
江南工业集团有限公司
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a compound heat treatment method for thin-walled spinning cylindrical parts of 30CrMnSiA steel. The structural stability and machinability of the material can economically solve the problems of high processing accuracy and hydraulic strength requirements

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  • Composite heat treatment method for 30CrMnSiA steel thin wall spinning cylinder-shape element

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Embodiment Construction

[0013] Below in conjunction with accompanying drawing, the present invention will be further described:

[0014] Referring to the accompanying drawings, after spinning 30CrMnSiA steel, inspect the size of the formed workpiece and whether there are cracks, etc., and carry out appropriate stress relief and tempering for the qualified workpiece (temperature 400-480°C, time 120-360 minutes) , so that the residual stress generated by the workpiece through spinning can be released to a certain extent, rough machining the workpiece after stress relief and tempering, and quenching the workpiece in stages (preheating 200-500°C, heating in a salt bath furnace 870-910°C) , and then carry out graded cooling of the workpiece (nitrate salt isothermal tank or alkali bath isothermal tank cooling 180 ~ 280 ℃, air cooling or water cooling below 50 ℃), after the workpiece is cooled, wash off the residual salt or lye attached to the surface of the workpiece, Passivation and anti-rust treatment ar...

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Abstract

A compound heat treatment method of 30CrMnSiA steel to thin wall cylindrical shaped element with large diameter and thin wall thickness by spinning is characterized in that the method comprises a preferable 'stress tempering-interrupted quenching-tempering' heat treatment combination. The method comprises the steps of: stress tempering a workpiece while releasing the residual stress of the workpiece to a certain extent by controlling the tempering temperature and temperature holding time; conducting interrupted quenching by preheating, heating with a salt-bath furnace, cooling with a nitrate thermostatic bath and air cooling, washing to remove residual salt or alkaline liquid on the surface of the workpiece, and performing passivation and anti-corrosive treatment; and placing the workpiece into a well type tempering furnace or a special tempering furnace to conduct tempering treatment. The workpiece subjected to compound heat treatment has the advantages of high processing precision, high hydraulic pressure test strength, and low deformation liability of the following machining operation.

Description

technical field [0001] The invention relates to a composite heat treatment method for 30CrMnSiA steel thin-walled spinning cylindrical parts, which is suitable for processing precision after the 30CrMnSiA steel material is formed into a thin-walled cylindrical part with a larger diameter (≥ 200 mm) and a thinner wall thickness. And hydrostatic test strength is high, and subsequent cutting processing is not easy to deform. Background technique [0002] In order to save raw materials, the processing of thin-walled cylindrical parts often adopts the spinning method. In the background technology, after 30CrMnSiA steel is spin-formed into thin-walled cylindrical parts, for products with small diameters, low processing accuracy and hydraulic test strength requirements, and small batches, salt bath isothermal quenching or vacuum heat treatment can be used. Oxidation and decarburization to prevent (or reduce) product deformation; but for 30CrMnSiA steel thin-walled cylindrical part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08C21D1/30C21D1/607
Inventor 姚春臣李职模刘赞辉罗青云
Owner 江南工业集团有限公司
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