A Crack Prevention Process for CF8C Castings

A process and material technology, which is applied in the field of anti-crack technology of CF8C material castings, can solve the problems of increased production costs, high product scrap rate, and easy cracks, etc., and achieve the effects of preventing cracks, good thermal stability, and not easy to adhere

Inactive Publication Date: 2016-08-17
OUTONG GRP QINGTIAN WANXIN VALVE TECH CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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Effect test

Embodiment Construction

[0011] The present invention specifically adopts the following process to cast the CF8C material: 1. The basic phenolic resin sand process is used for modeling, so that the surface of the casting does not increase carbon, and the cavity does not increase sulfur (S) phosphorus (P) during the molten steel filling process. and hydrogen (H). The tendency to crack is thereby reduced. ②In the process of smelting alloys, the carbon content is reduced from the original 0.08% to 0.05%, and the chromium content is increased from the original 18% to 18.6%, which increases the ferrite content in austenitic stainless steel, thereby reducing Crack tendency. ③ During welding repair, control the temperature of the welding zone (110-130°C), use small-caliber welding consumables, and multi-layer welding to prevent secondary cracks. ④In the case of solid solution, change the temperature from the original direct heating to 1080°C quenching to the casting temperature rising to 960°C for 15-20 mi...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04B22C9/02C21D6/00
Inventor 姜文松姜文岳
Owner OUTONG GRP QINGTIAN WANXIN VALVE TECH CO LTD
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