METHOD FOR HEAT TREATMENT OF PRODUCTS FROM MARTENSITE-TYPE SPRING STEEL Russian patent published in 2005 - IPC

Abstract RU 2244757 C1

FIELD: metallurgy, in particular heat treatment of products from spring steel.

SUBSTANCE: invention relates to improve relaxation strength of products from spring steel due to decrease of residual austenite content. Claimed method includes hardening of products from martensite-type spring steel by heating in salt electric furnace at 900-940⁰C and drawing at 350-390⁰C; holding for 1 h and cooling in air. After heat treatment to provide product purity its surface is finished and subsequently content of residual austenite in one product from lot is determined. Method of invention affords the ability to improve relaxation strength of products from martensite-type spring steel in accordance with performance demands.

EFFECT: products from martensite-type spring steel with improved relaxation strength.

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RU 2 244 757 C1

Authors

Tsenev V.A.

Strebkov V.A.

Dates

2005-01-20—Published

2003-07-15—Filed