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Prehardening treatment method of NAK80 mould steel

A technology of pre-hardening treatment and die steel, applied in the field of pre-hardening treatment of precipitation-strengthened plastic mold steel, can solve the problems of long pre-hardening treatment time, short treatment time, low energy consumption, etc., and achieve metallurgical manufacturing cost reduction and productivity. High, simple equipment requirements

Active Publication Date: 2006-01-11
宝武特种冶金有限公司
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Problems solved by technology

The invention has the characteristics of short pre-hardening treatment time of NAK80 die steel and low energy consumption, solves the problem of long pre-hardening treatment time of NAK80 die steel, improves production efficiency, greatly reduces the production cost of metallurgical manufacturing, and satisfies the requirements of die steel Market demand for precipitation strengthened plastic mold steel

Method used

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Embodiment Construction

[0015] specific implementation plan

[0016] A certain iron and steel company implements the patent of the present invention, and the precipitation strengthened plastic mold steel NAK80 steel (the weight percentage of the chemical composition content of this mold steel is: carbon 0.10~0.18%, manganese 1.70~2.00%, nickel 2.90~3.40%, molybdenum 0.20~ 0.50%, aluminum 0.70-1.10%, copper 0.80-1.20%, silicon ≤ 0.45%, phosphorus ≤ 0.025%, sulfur ≤ 0.020%) for pre-hardening treatment in the factory, which is characterized by the use of "hot forging forming→quenching→returning "Fire" three-step process to produce finished NAK80 die steel products with a hardness range of HRC38~HRC43: first, hot forging and forming process, using forging presses to heat forge and deform NAK80 die steel to produce finished dies whose dimensions meet the specifications Steel and steel (finished product cross-sectional size 200×795mm, 250×795mm, 300×795mm, 350×795mm), the technical points are: (1) During h...

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Abstract

A method for prehardening the die steel NAK80 includes such steps as thermal forging with 860-920 deg.C for final temp and 15-20% for final deformation, quenching by directly putting the forged die steel at 900 deg.C in conventional quenching liquid to cool its temp to 200 deg.C, and tempering steps including heating it to 490-560 deg.C at the speed of 80-100 deg.C / h in the tempering furnace, holding the temp for 2-6 hr, and cooling in air. Its advantages are low cost and short period.

Description

technical field [0001] The invention relates to a pre-hardening treatment method for plastic mold steel in the ferrous metallurgy industry, in particular to a pre-hardening treatment method for precipitation-strengthened plastic mold steel. Background technique [0002] Die steel is a special alloy steel, which can be divided into hot work die steel, cold work die steel and plastic die steel according to its application. Plastic mold steel is the raw material for plastic mold manufacturing (plastic mold is an important process equipment in today's plastic forming industry, plastic products cannot be separated from plastic molds, and the manufacture of plastic molds first requires plastic mold steel. In today's world, human Life and industrial development are more and more dependent on the new industry of plastic products. With the increase of plastic mold manufacturing output, the consumption of plastic mold steel is also increasing year by year.). As the main component of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/18C21D5/00
Inventor 续维
Owner 宝武特种冶金有限公司
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