Rolling and cogging production method for large austenite stainless and heat-resistant gas valve steel 21-4N ingot

Abstract

A rolling and cogging production method for a large austenite stainless and heat-resistant gas valve steel 21-4N (5Cr21Mn9Ni4N) ingot comprises the steps as follows: 1, the austenite stainless and heat-resistant gas valve steel ingot is subjected to hot charging; 2, the ingot is heated by a first fire of a soaking furnace, and rolled piece returns to the furnace and is heated by a second fire; in the heating process of the ingot by the first fire, (A) the ingot enters the furnace at 500-900 DEG C; (B) the temperature rises to 1150-1250 DEG C; (C) the temperature is kept at 1150-1250 DEG C for 2-6 hours; (D) the temperature difference between male and female faces of the ingot is less than or equal to 20 DEG C; in the returning and heating process of the rolled piece by the second fire, (A) the temperature rises to 1150-1250 DEG C and kept for 2-3 hours; (B) the temperature difference between the male and female faces of the rolled piece is less than or equal to 20 DEG C; and 3, after the two heating procedures, the ingot and the rolled piece are subjected to rolling; (A) a roll is preheated to 100-300 DEG C; (B) the rolling temperature is 1150-1250 DEG C, and the finished rolling temperature is greater than 900 DEG C; and (C) the bite speed of the roll is 10-40 rpm. The rolling and cogging production method is simple in technology; the ingot case is enlarged; the production cycle is shortened greatly; the energy consumption is reduced greatly; the cogging yield is increased; manufactured steel billet wires are used for producing a wire coil; and the piece weight of the coil is increased greatly.

Description

technical field [0001] The invention relates to a production method for thermal processing of a steel material in the field of metallurgy, in particular to a production method for thermal processing of a large ingot of an austenitic stainless heat-resistant valve steel material. Background technique [0002] Valve steel is a special alloy steel. According to the organization, it can generally be divided into austenitic stainless heat-resistant valve steel, martensitic stainless heat-resistant valve steel, and iron-nickel-based alloy valve steel. category. [0003] Valve steel materials are mainly used to manufacture intake valves and exhaust valves for internal combustion engine cylinders, and are mainly demanded by industries such as automobiles, motorcycles, tractors, ships, military tanks, and various construction machinery. [0004] The grade of 21-4N steel is 5Cr21Mn9Ni4N. It is an austenitic stainless heat-resistant valve steel with excellent high-temperature wear re...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of the above-mentioned prior art, the object of the present invention is: develop a kind of production method of austenitic stainless heat-resistant valve steel 21-4N big cast ingot rolling blanking, described method solves the problem of high temperature strength , Large deformation resistance, narrow thermal deformation temperature range, and poor ductility of austenitic stainless heat-resistant valve steel 21-4N ingot technical problems, rolling out qualified 21-4N billets, a relatively large Reduce energy consumption and production cost of metallurgical manufacturing to meet user requirements and market needs

Images