Bainite isothermal heat treatment method of medium-carbon silicomanganese nickel-chromium-series low-alloy steel

A medium-carbon silicon-manganese-chromium-nickel system and carbon-silicon-manganese-chromium-nickel system technology, applied in the field of warm heat treatment, can solve problems such as hindering the progress of aircraft manufacturing, unqualified product performance, and failure to meet the high strength and toughness requirements of key components. Excellent stress corrosion resistance, improved comprehensive mechanical properties, and good plasticity and toughness
CN104294014AActive Publication Date: 2015-01-21CAPITAL AEROSPACE MACHINERY +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CAPITAL AEROSPACE MACHINERY
Publication Date
2015-01-21

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Abstract

A bainite isothermal heat treatment method of medium-carbon silicomanganese nickel-chromium-series low-alloy steel aims to solve a problem that performance requirements of some key components cannot be satisfied since yield strength is significantly low when a temper temperature is lower than an isothermally quenching temperature in a conventional isothermal heat treatment technology. The method includes following steps: performing austenitizing treatment to the medium-carbon silicomanganese nickel-chromium-series low-alloy steel; carrying out isothermal oil-quenching or isothermal gas-quenching at a temperature which is higher than a martensite transformation temperature by 5-60 DEG C with the temperature being maintained for 120-180 min; and performing tempering at a temperature which is higher than an isothermal quenching temperature by 10-60 DEG C for 30-150 min. Through treatment by the method, the medium-carbon silicomanganese nickel-chromium-series low-alloy steel has a tensile strength reaching 1590-1980 MPa, a yield strength reaching 1350-1770 MPa and a ductility being 14-25%.
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Description

technical field

[0001] The invention relates to a bainite isothermal heat treatment method for medium-carbon silicon-manganese-chromium-nickel low-alloy steel. Background technique

[0002] Medium-carbon silicon-manganese-chromium-nickel low-alloy steel is a low-alloy high-strength steel. Its carbon content is generally between 0.25-0.5%, and the total content of alloying elements is not higher than 5%. The role of hardenability; the addition of Mo and V elements can refine the grains, improve the microstructure of the steel, and improve the tempering ability of the steel. Because of its high strength, medium carbon silicon-manganese-chromium-nickel low-alloy steels have been used in aircraft landing gear, rocket shell materials and engine pump cross shafts. With the development of aerospace technology, higher and higher requirements are also put forward for the comprehensive strength and toughness of medium-carbon silicon-manganese-chromium-nickel low-alloy steels. [000...

Claims

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