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Process for heating carbon steel and low-alloy steel heavy piece-weight composite blank

A low-alloy steel and composite billet technology, which is applied in the field of metallurgical industry billet heating technology, can solve the problems of uneven heating of large single-weight composite billets, easy rolling cracking, etc., to reduce the risk of rolling cracking, reduce the degree of oxidation, The effect of reducing the soaking time

Inactive Publication Date: 2013-09-11
JIGANG GRP
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  • Description
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a heating process for large single-weight composite blanks of carbon steel and low-alloy steel, which well solves the problem of uneven heating and easy rolling cracking of large single-weight composite blanks

Method used

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  • Process for heating carbon steel and low-alloy steel heavy piece-weight composite blank
  • Process for heating carbon steel and low-alloy steel heavy piece-weight composite blank

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Embodiment Construction

[0013] Such as figure 2 As shown, the heating process of a large single-weight composite billet of carbon steel and low alloy steel in the present invention includes three stages of preheating, heating and soaking, and a heat preservation process is added in the preheating and heating stages.

[0014] In the preheating stage, the composite bale is preheated to 580-620°C, and then kept at this temperature for 0.5-2h; the heating stage includes a heating stage I and a heating stage II, and in the heating stage I, the basil is Heating to 910°C, the heating rate is 100-130°C / h, and then keeping at this temperature for 0.5-2h; in the heating stage II, the ash material is heated to 1270°C, and the heating rate is 80-110°C / h.

[0015] In the heating process provided by the present invention, heat preservation is carried out at an appropriate temperature during the heating process, and the soaking time at high temperature is reduced. Compared with the traditional heating process, thi...

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Abstract

The invention discloses a process for heating a carbon steel and low-alloy steel heavy piece-weight composite blank, belonging to the technical field of processes for heating blanks in the metallurgical industry. Heating is carried out by adopting a heat storage type trolley; the process comprises three stages of preheating, heating and soaking, wherein insulation procedures are added in the preheating stage and the heating stages, in the preheating stage, the blank is preheated and then insulated, the heating stage comprises a heating stage I and a heating stage II, the blank is heated and then insulated in the heating stage, and is continuously heated to reach a certain temperature in the heating stage II, and the composite blank is soaked and insulated by the temperature obtained in the soaking stage. According to the process, a method for insulating at a proper temperature in a temperature-rise period of a heating furnace is adopted, and thus the uniformity of heating the blank is improved, the high temperature soaking time is reduced, the degree of oxidation of the surface of the blank is reduced, and the danger that the blank is cracked due to rolling in the rolling process is reduced.

Description

technical field [0001] The invention relates to a heating process for blanks in the metallurgical industry, in particular to a heating process for large single-weight composite blanks of carbon steel and low alloy steel. Background technique [0002] The heating process of the slab in the heating furnace is realized by conduction, radiation and convection. The heating time of the slab has a linear relationship with the thickness of the slab. The thicker the slab, the longer the heating time and the longer the soaking time, so the surface oxidation of the thicker slab is more serious. When the thickness of the iron oxide scale reaches a certain level, it will seriously affect the heating of the billet in the high temperature section, and the ability of the large single-weight composite billet to obtain heat in the soaking section will be weakened, so that uneven heating of the billet will occur, resulting in cracking during rolling. danger. [0003] Such as figure 1 As men...

Claims

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Application Information

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IPC IPC(8): C21D9/70
Inventor 孙卫华赵乾刘晓美崔健曹丰平马兴云
Owner JIGANG GRP
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