A Crack Prevention Process for CF8C Castings

Abstract

The invention relates to a technology for preventing a cast piece made of a CF8C material from cracking. Due to the fact that cracks are generated easily when CF8C materials are produced, the rejection rate of products is high, and production cost is increased for enterprises. The technology for preventing the cast piece made of the CF8C material from cracking is characterized by comprising the steps that 1, the alkaline phenolic resin sand technology is used for shaping; 2, the carbon content is reduced and the chromium content is increased during alloy smelting; 3, the temperature of a welding area is controlled to range from 110 DEG C to 130 DEG C during welding repair, a small-diameter welding material is used, and multi-layer welding is conducted; 4, heat insulation is conducted for fifteen to twenty minutes when the temperature of quenching water rises to 960 DEG C during solid solution, and then the temperature is made to rise to 1080 DEG C after heat insulation for water quenching. By the adoption of the technology for preventing the cast piece made of the CF8C material from cracking, the number of cracks generated during production of cast pieces is reduced, the rejection rate is reduced, and production cost is reduced for the enterprises.

Description

technical field

[0001] The invention relates to an anti-cracking process for castings made of CF8C. Background technique

[0002] The CF8C material is very prone to cracks during the production process, resulting in a high product scrap rate and increasing the production cost of the enterprise. Contents of the invention

[0003] The invention provides a CF8C material casting anti-cracking process, which can reduce the cracks generated in the casting production process, reduce the scrapping rate, and reduce the production cost of the enterprise.

[0004] The technical solution of the present invention is: a CF8C material casting anti-cracking process, which is characterized in that the steps are as follows: (1) using alkaline phenolic resin sand process molding; ② in the process of smelting alloys, reducing the carbon content and increasing the chromium content; ③ Control the temperature of the welding zone at 110-130°C during welding repair, use small-caliber welding cons...