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Steel spheroidizing annealing process

A spheroidizing annealing and process technology, applied in the field of steel heat treatment, can solve the problems of unsatisfactory spheroidizing annealing process effect and other problems

Inactive Publication Date: 2020-03-27
宁波丰之纯线材制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current steel spheroidizing annealing process is not ideal, so it needs to be improved urgently

Method used

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  • Steel spheroidizing annealing process
  • Steel spheroidizing annealing process

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Embodiment 1

[0017] A steel spheroidizing annealing process, by knowing the elements contained in each steel variety and its austenite Ac1 transformation temperature, to obtain the spheroidizing temperature;

[0018] The calculation formula of the Ac1 is:

[0019] Ac1=723-Mn%10.7-16.9Ni%+16Cr%+29.1Si%,

[0020] Ac1=723-7Mn5-15Ni%+15Cr%+40Mo%+50V%,

[0021] Ac1=any one of 723-14Mn%+22Si%-14.4Ni%+23Cr%.

[0022] The constant temperature time of heat infiltration should be determined according to the heating power time of the carrier (furnace), because when the austenite temperature is very high and very long, after the carbides are completely dissolved and homogenized, what is obtained after cooling is often a lamellar structure; the so-called Overheating will also affect the surface, and high temperature will be accompanied by carburization. The constant temperature time setting should also consider the loading capacity and specifications, and increase or decrease the constant temperatur...

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Abstract

The invention discloses a steel spheroidizing annealing process. The process comprises the following step of evaluating a spheroidizing temperature by knowing elements contained in each steel varietyand an austenite Ac1 transformation temperature, wherein a calculation formula of Ac1 is one of the following formulas: Ac1=723-Mn%10.7-16.9Ni%+16Cr%+29.1Si%, Ac1=723-7Mn5-15Ni%+15Cr%+40Mo%+50V%, andAc1=723-14Mn%+22Si%-14.4 Ni%+23Cr%. By using the process, steel can obtain a good spheroidizing result.

Description

technical field [0001] The invention relates to the technical field of steel heat treatment, in particular to a steel spheroidizing annealing process. Background technique [0002] The so-called spheroidizing annealing of steel is mainly through heating to a place above Ac1 of 20-30°C, holding it for a period of time, and then slowly cooling to a place slightly lower than Ac1, and staying for a period of time to fully complete the transformation of the structure and obtain iron It is a process in which the body is uniformly distributed similar to the structure of spherical granules, and then air-cooled to about 500°C. From the perspective of downstream customers, it is actually an annealing and softening process to meet the needs of downstream customers for cold heading and cold extrusion, reduce material hardness, enhance material fluidity, and reduce forming energy. That is to say, it is a process in which the carbon element that is not evenly distributed in the raw mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/32C21D6/00
CPCC21D1/32C21D6/00
Inventor 陈周城
Owner 宁波丰之纯线材制造有限公司