Heat-treatment machining method of wear-resistant medium alloy steel castings

A processing method and alloy steel technology, applied in the field of heat treatment processing of wear-resistant alloy steel castings

Inactive Publication Date: 2013-09-04
江苏双星特钢有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quality of products processed by traditional heat treatment processing methods is poor, and the service life is only about 10 months

Method used

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  • Heat-treatment machining method of wear-resistant medium alloy steel castings

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Embodiment 1

[0011] Embodiment 1 is based on the present invention heat treatment process

[0012] The product name is wear-resistant steel lining plate, the specification model is medium alloy, and the sampling base is 150Kg;

[0013] Chemical Composition Inspection Items Technical Requirements Inspection Results

[0014] C,% 0.3-0.45 0.38

[0015] Si, % 1.0-1.7 1.7

[0016] Mn, % 0.6-1.3 1.2

[0017] P ,% ≤0.035 0.018

[0018] S ,% ≤0.03 0.01

[0019] Cr, % 1.5-2.2 1.8

[0020] Tensile strength Rm N / ㎜2 ≥ 500 1300

[0021] Elongation A after breaking, % ≥ 2 2.3

[0022] Hardness HRC ≥35 51.3; 52.0; 52.0

[0023] Impact toughness without opening J / cm2 ≥25 50; 68; 70

[0024] The products produced by the present invention are produced by the Jiangsu Product Quality Supervision and Inspection Research Institute according to GB / T4336-2002 [Carbon steel and low-alloy steel spark source atomic emission spectroscopic...

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Abstract

The invention relates to the field of heat-treatment machining, in particular relates to a heat-treatment machining method of wear-resistant medium alloy steel castings. The heat-treatment machining method comprises the following steps of: heating a casting with the wall thickness of 40-120mm from 0 DEG C to 380 DEG C through two hours, and preserving for one hour after the temperature rises to 380 DEG C; heating the casting from 380 DEG C to 620 DEG C through two hours, and preserving for one hour after the temperature rises to 620 DEG C; heating the casting from 620 DEG C to 950 DEG C through three hours; quenching: preserving for three hours after the temperature rises to 950 DEG C, and oil cooling; and performing low-temperature tempering: heating to 380 DEG C, and air cooling after preserving heat for four to five hours. According to the method, the problems that casting products generally have serious dendritic segregation and uneven internal organization and crystalline grains are coarse are solved. Through a heat-treatment technology, the influence of harmful substances is eliminated or reduced, and the mechanical properties of toughness and hardness of the products are improved. The service life of the products achieves more than 18-30 months.

Description

technical field [0001] The invention relates to the field of heat treatment processing, in particular to A heat treatment method for wear-resistant medium alloy steel castings . [0002] Background technique: [0003] In the early 1980s, small and medium-sized ball mills were widely used in my country to equip wear-resistant steel parts. It adopted the ground pond furnace type coke burning steel parts and castings, and then implemented air-cooled or water-cooled heat treatment processing methods, which were widely used. In cement, mining, electric power and other industries. The quality of products processed by traditional heat treatment processing methods is poor, and the service life is only about 10 months. With the development of social science and technology, environmental protection measures have been improved, and ball milling machines have been discarded and replaced. The requirements for the media to be milled by ball milling machines are constantly increasing, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18
Inventor 顾鹏
Owner 江苏双星特钢有限公司
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