Method for producing steel sectional material of air valve

Abstract

The invention discloses a method for producing a steel sectional material of an air valve. The method comprises the steps of: (1) carrying out solution treatment on a rolled sectional material; (2) removing an oxidation layer from the sectional material subjected to the solution treatment; (3) plating by using heated lime slurry; (4) pointing one end of the rolled sectional material; (5) burying and lubricating, and heating and drawing the heated sectional material; (6) carrying out solution heat treatment on the drawn sectional material; and (7) straightening and polishing the sectional material subjected to the solution heat treatment. The formula of the lime slurry for plating in the step (3) is characterized in that 2 parts by weight of lime and 8 parts by weight of water are heated to 80-100 DEG C, and the plating time is 5-8 minutes. In the step (5), an electric heating method is used for the rolled sectional material, and the heating temperature is 400-920 DEG C; and a formula of a lubricant in the step (5) comprises the following components in parts by weight: 6 parts of carbon powder, 3 parts of soap powder and 1 part of sulfur. The method is characterized in that the produced steel sectional material has uniform inner crystal texture, annealing and acid washing processes are omitted, the production cost is reduced and the production efficiency is improved.

Description

technical field [0001] The invention relates to a production method of profile, in particular to a production method of valve steel profile. Background technique [0002] Valve steel profiles, commonly known as valve steel small profiles or valve steel, refer to valve steel silver bright rods with a diameter of less than 10 mm and a polished surface. They are mainly used to manufacture small gasoline engines and small diesel engines. The key material of the valve. At present, the commonly used valve steels mainly include austenitic valve steels such as 53Cr21Mn9Ni4 (21-4N for short), 33Cr23Ni8Mn3N (23-8N for short) and 55Cr21Mn8Ni2N (21-2N for short) and martensitic valve steels such as 42Cr9Si2 and 40Cr10Si2Mo. steel. Since the valve works under harsh conditions such as high temperature, high pressure, high erosion and high corrosion, the valve steel must have high mechanical properties and corrosion resistance. At room temperature (usually 0-35°C), valve steel has a ser...

AI Technical Summary

Problems solved by technology

It can be seen that in the cold drawing process of the prior art, in addition to the above repeated and complicated operations, the frequency of material breaking is extremely high due to the high hardness and strength of the valve steel material, and the high frequency of material breakage in the cold drawing process of the prior art. The material is scrapped, and the finished product rate is low, usually only about 92%.

In this way, the existing gas valve steel production methods not only have complicated operations and high production costs, but also greatly reduce the comprehensive yield of products from wire drawing to finished products

Moreover, the internal crystal structure of the material is not uniform

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