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Heat-resistant alloy carburizing steel and preparation method thereof

A heat-resistant alloy and carburizing steel technology, applied in the field of carburizing steel, can solve the problems of cracking tendency and poor process performance, and achieve the effects of fine grain, long service life and uniform and stable structure

Active Publication Date: 2019-05-17
宝钢特钢长材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Adding more Cr, Mo, Ni in 201611265306.5, especially Mo can improve the thermal stability of the steel, but the hardenability is improved, the hardness of the steel is high, and the tendency to crack and the process performance of the precision auto parts are relatively low. Difference

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  • Heat-resistant alloy carburizing steel and preparation method thereof
  • Heat-resistant alloy carburizing steel and preparation method thereof
  • Heat-resistant alloy carburizing steel and preparation method thereof

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Embodiment Construction

[0045] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0046]Carburized steel is processed into workpieces and generally undergoes carburizing, quenching, cryogenic treatment (to reduce paralysis), tempering, aging and other processes, and finally obtains a tempered martensite structure. Among them, the temperature range of carburizing is about 890-930°C; the quenching temperature is 850-880°C, after quenching, martensite, martensite plus parasite or martensite plus parasite plus undissolved carbides are obtained; The fire temperature is about 200°C, that is, from room temperature to the tempering temperature, both martensite and parasite undergo structural transformation, including the decomposition of martensite, the transformation of parasite, the precipitation and change of carbides, and the recovery and recovery of α phase. re-crystallize. Its organization still maintains a fine lath martens...

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Abstract

The invention discloses heat-resistant alloy carburizing steel. The heat-resistant alloy carburizing steel comprises the following components of, by weight percentage, 0.16-0.22% of C, less than or equal to 0.15% of Si, less than or equal to 0.60% of Mn, 0.10-0.25% of Cu, 1.80-1.90% of Cr, 1.80-1.90% of Ni, 0.50-1.10% of Mo, 0.015-0.030% of S, less than or equal to 0.015% of P, 0.010-0.025% of Al,0.013-0.018% of N, 0.020-0.040% of Nb, less than or equal to 0.00015% of H, less than or equal to 0.0012% of O, and the balance Fe and impurity elements. The invention further discloses a preparationmethod of the heat-resistant alloy carburizing steel. According to the heat-resistant alloy carburizing steel and the preparation method thereof, the heat-resisting alloy carburizing steel with 300-500 DEG C working temperature resistance, fine crystal grains, high purity and excellent strength and toughness performance can be obtained.

Description

technical field [0001] The invention relates to carburizing steel, more specifically to a heat-resistant alloy carburizing steel and a preparation method thereof. Background technique [0002] Alloy carburizing steel refers to low-carbon alloy structural steel used after carburizing heat treatment. It has the performance characteristics of external hardness and internal toughness. It is often used to make wear-resistant parts that withstand impact, such as transmission gears in automobiles and tractors, internal combustion engines Camshafts, piston pins, etc. Its composition characteristics are: C%: 0.10% ~ 0.25%, to ensure that the core of the part has sufficient plasticity and toughness. The main alloying element is Cr, and Ni, Mn, B, W, Mo, V, Ti, etc. can also be added. Among them, the main function of Cr, Ni, Mn, and B is to improve hardenability, so that the core of large-sized parts can be quenched. Obtain a low-carbon martensite structure to improve strength and to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/42C22C38/44C22C38/02C22C38/04C22C38/06C22C38/48C22C33/06C21D8/06C21D1/26C21D1/18
Inventor 黄瑞刘湘江李阳黄宗泽江运宏施惠琴夏玲
Owner 宝钢特钢长材有限公司
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