Heat treatment method of wear-resistant cast iron

A heat treatment method and technology for wear-resistant cast iron, applied in the field of cast iron, can solve the problems of increasing the workload of workers, complex and unstable processes, and increasing the cost of post-processing of steel castings. The effect of low heat treatment cost

Inactive Publication Date: 2018-01-30
湖州正德轻工机械有限公司
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Problems solved by technology

[0003] Vacuum heat treatment or annealing heat treatment is usually used in the existing casting technology. After the heat treatment, the steel castings are processed by grinding or machining, which will increase the post-processing cost of the steel castings and increase the workload of the workers; and the process is complicated. unstable

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the examples, but not as a basis for limiting the present invention.

[0014] Example. The heat treatment method of wear-resistant cast iron is characterized in that: the wear-resistant cast iron is composed of the following components in weight percentage:

[0015] C2.9~3.1%; Cr6~8%; Mn3.0~4.0%; Ni0.6~0.8%; Si0.5~1.0%; P≤0.05%; S≤0.03%, the rest is Fe;

[0016] Put wear-resistant castings below 200°C into heat treatment furnace, heat up to 360-400°C, keep warm for 8h, heat up to 900-940°C, keep warm for 20-24h, furnace cool to 650-680°C, keep warm for 8-10h, and furnace cool to 500°C out of the furnace and air-cooled to obtain cast iron parts.

[0017] Preferably, the wear-resistant cast iron is composed of the following components by weight percentage:

[0018] C3%; Cr7%; Mn3.5%; Ni0.7%; Si0.7%; P≤0.05%; S≤0.03%, the rest is Fe. The wear-resistant casting is put into a heat treatment furnace...

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Abstract

The invention discloses a heat treatment method of wear-resistant cast iron. The wear-resistant cast iron is prepared from the following components in percentage by weight: 2.9 to 3.1 percent of C, 6to 8 percent of Cr, 3.0 to 4.0 percent of Mn, 0.6 to 0.8 percent of Ni, 0.5 to 1.0 percent of Si, less than or equal to 0.05 percent of P, less than or equal to 0.03 percent of S and the balance of Fe. The heat treatment method comprises the following steps: putting a wear-resistant casting into a heat treatment furnace at a temperature of below 200 DEG C; heating to 360 to 400 DEG C; preserving heat for 8 hours; heating to 900 to 940 DEG C; preserving heat for 20 to 24 hours, and performing furnace cooling to 650 to 680 DEG C; preserving heat for 8 to 10 hours; performing furnace cooling to 500 DEG C, discharging and performing air cooling to obtain a cast iron part. By adopting the heat treatment method, high toughness is achieved while high hardness is ensured, and the process is simpleand stable.

Description

technical field [0001] The invention relates to the field of cast iron, in particular to a heat treatment method for wear-resistant cast iron. Background technique [0002] Ductile cast iron is a kind of cast iron in which the graphite in cast iron is spherical. The graphite is formed into a spherical shape through spheroidizing treatment. This spherical graphite can reduce the stress concentration and reduce the cracking of the matrix. Due to the high strength, plasticity and toughness of ductile iron, the fatigue strength is close to that of medium carbon steel, the wear resistance is better than that of non-alloy steel, the cutting performance is comparable to that of gray cast iron, and the manufacturing cost is low, it has been widely used. . [0003] Vacuum heat treatment or annealing heat treatment is usually used in the existing casting technology. After the heat treatment, the steel castings are processed by grinding or machining, which will increase the post-proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D5/00C22C37/10C22C37/08
Inventor 崔红伟
Owner 湖州正德轻工机械有限公司
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