Rare earth austenite hot work die steel and preparation thereof

Abstract

The invention relates to a rare earth austenite type hot die steel material, belonging to the alloy steel manufacture technical field. The compositions in percentage by weight of the hot die steel are: 0.3 to 0.7 percent of C, 0.5 to 1 percent of Si, 10.5 to 15 percent of Mn, 2.0 to 6.0 percent of Cr, 1.5 to 3.5 percent of Mo, 0.5 to 2.0 percent of V, 0.01 to 0.02 percent of of P, less than 0.005 percent of S, 0.003 to 0.01 percent of rare earth elements, and the balance being Fe. A method for preparing the hot die steel comprises the following steps of dispensing materials, melting, casting, remelting electro slag, carrying out high temperature homogenization at a temperature of between 1240 and 1290 DEG C, forging roughly, forging a blank, annealing, carrying out solution treatment at a temperature of between 1140 and 1200 DEG C and carrying out aging treatment at a temperature of between 700 and 760 DEG C. The hot die steel is the rare earth adding austenite type hot die steel which is high in thermal stability, strength and toughness.

Description

technical field [0001] The invention relates to a rare earth austenitic hot work die steel and a preparation method thereof, belonging to the technical field of alloy steel manufacture. Background technique [0002] At present, there are few researches on austenitic hot work die steel at home and abroad. For hot work die steel, martensitic steel is commonly used, and the tempering temperature of martensitic steel is generally 500-620 ℃ Between, if this temperature is exceeded, martensite will decompose, causing the matrix to soften, making it difficult to use at higher temperatures. The matrix of austenitic hot work die steel is austenite, which avoids this problem. [0003] This type of steel usually dissolves alloying elements into the austenite matrix through solid solution treatment to prepare for age hardening treatment. Aging treatment can cause alloying elements Cr, Mo, V, etc. to precipitate in the form of carbides, and precipitate through the second phase dispersio...

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Problems solved by technology

[0002] At present, there are few researches on austenitic hot work die steel at home and abroad. For hot work die steel, martensitic steel is commonly used, and the tempering temperature of martensitic steel is generally 500-620 ℃ Between, if this temperature is exceeded, martensite will decompose, causing the matrix to soften, making it difficult to use at higher temperatures

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