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Spheroidizing annealing method for carbon tool steel roller hearth type annealing furnace for automobile

A technology of carbon tool steel and spheroidizing annealing, which is applied in the field of metallurgy, can solve the problems of high temperature setting in the heating zone, low fan frequency, and difficult control, etc., to achieve improved control accuracy, improved production efficiency, and convenient operation Effect

Pending Publication Date: 2022-03-15
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature fluctuation is controlled within ±5 and ±3, the roll speed of the spheroidizing annealing process is 3.0-3.5m / h, the roll speed is relatively slow, the fan frequency is low (the existing fan frequency is 12HZ-50HZ), and the setting temperature of the heating zone is high and difficult to control Big

Method used

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  • Spheroidizing annealing method for carbon tool steel roller hearth type annealing furnace for automobile
  • Spheroidizing annealing method for carbon tool steel roller hearth type annealing furnace for automobile

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Embodiment 1

[0016] This embodiment provides a spheroidizing annealing method for carbon tool steel (C35R) for automobiles in a roller hearth annealing furnace, which is characterized in that the following methods are used to ensure that the spheroidizing rate of the steel out of the furnace reaches more than 80%:

[0017] The roller hearth annealing furnace adopts a continuous furnace, and the continuous furnace is divided into 13 heating sections from the beginning to the end. Heating section 730℃±5℃, 4th heating section 730℃±5℃, 5th heating section 730℃±5℃, 6th heating section 730℃±5℃, 7th heating section 730℃±5℃, 8th heating section Heating section 730°C±3°C, 9th heating section 720°C±3°C, 10th heating section 710°C±3°C, 11th heating section 700°C±3°C, 12th heating section 670°C±3°C, 13th heating section The heating section is 630°C±3°C. Among them, the 1st-3rd section is a heating section, and the heating time is 2.9 hours; the 4th-8th section is a heat preservation section, and the ...

Embodiment 2

[0022] This embodiment provides a method for spheroidizing annealing of carbon tool steel for automobiles in a roller hearth annealing furnace, which is characterized in that the following methods are used to ensure that the spheroidizing rate of the steel produced from the furnace reaches more than 80%:

[0023] The roller hearth annealing furnace adopts a continuous furnace, and the continuous furnace is divided into 13 heating sections from the beginning to the end. Heating section 730℃±5℃, 4th heating section 730℃±5℃, 5th heating section 730℃±5℃, 6th heating section 730℃±5℃, 7th heating section 730℃±5℃, 8th heating section Heating section 730°C±3°C, 9th heating section 720°C±3°C, 10th heating section 710°C±3°C, 11th heating section 700°C±3°C, 12th heating section 670°C±3°C, 13th heating section The heating section is 630°C±3°C. Among them, the 1st-3rd section is a heating section, and the heating time is 3.2 hours; the 4th-8th section is a heat preservation section, and t...

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Abstract

The invention discloses a spheroidizing annealing method of a roller hearth type annealing furnace for carbon tool steel for automobiles, which comprises the following steps of: subdividing a heating section of a continuous furnace into 13 sections from the head to the tail, controlling, charging when residual oxygen in the furnace is stabilized to be less than 5ppm, paving steel in the continuous furnace in a multi-layer tiling manner, setting the roller speed to be 3.0-7.0 m / h in the spheroidizing annealing process, and controlling the spheroidizing annealing temperature to be 20-30 DEG C; the frequency of the fan is set to be 2-10 Hz, and it is guaranteed that the spheroidizing rate of the steel discharged out of the furnace reaches 80% or above. Compared with an existing periodic spheroidizing annealing process, the method has the advantages that the production period is shortened, the operation is convenient, the heating area temperature control difficulty is greatly reduced, and the control precision is remarkably improved.

Description

technical field [0001] The invention relates to an annealing process in the field of metallurgy, in particular to a spheroidizing annealing process of a carbon tool steel roller hearth annealing furnace for automobiles. Background technique [0002] The spheroidizing annealing process of the existing carbon tool steel for automobiles adopts the periodic spheroidizing annealing process, which is to use a roller hearth annealing furnace to heat the steel to 20-30 °C above Ac1, keep it warm for a period of time, and then slowly cool it to a temperature slightly lower than Ac1 , and stay for a period of time to complete the transformation of the structure, and obtain a structure of spherical or granular carbides uniformly distributed on the ferrite matrix. The roller hearth annealing furnace adopts chain transmission to drive the roller table in the furnace to rotate, the furnace rollers are equidistantly spaced, and the maximum heating temperature in the furnace is 950°C. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/32C21D6/00C21D9/00
CPCC21D1/32C21D6/00C21D9/0012Y02P10/20
Inventor 汪寿伟
Owner NANJING IRON & STEEL CO LTD
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