Method for heating double-phase stainless steel continuous casting billet

A technology of duplex stainless steel and heating method, used in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of cracking of rolled products, low heating temperature, etc., to prevent surface cracking, improve yield, and have strong controllability. Effect

Inactive Publication Date: 2015-03-25
YONGXING SPECIAL STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the difference between duplex stainless steel continuous casting slab rolled steel and general stainless steel continuous casting slab is that the heating temperature is relatively low, and the heating temperature is generally controlled at 1150~1180 ℃, and there is basically no difference in other aspects, so improper heating temperature control is in the rolling process It is easy to crack the rolled product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for heating a continuous cast slab of duplex stainless steel, comprising the steps of:

[0042] (1) Load 30 transition billets into the heating furnace one by one, adjust the temperature of the heating furnace and the ratio of natural gas to air in the heating furnace;

[0043] (2) After the furnace loading of 30 pieces of transition steel is completed, the duplex stainless steel continuous casting slab is charged, and the heating temperature of the duplex stainless steel continuous casting slab is controlled at 1100 °C;

[0044] (3) After the duplex stainless steel continuous casting slab is loaded into the furnace, more than 30 transition steels are loaded into the heating furnace. While the transitional billet and the duplex stainless steel continuous casting billet are being heated in the heating furnace, they are continuously pushed forward to the exit of the furnace and released from the furnace. When the last 20 transitional billets loaded in step (1) re...

Embodiment 2

[0049] The difference from the above embodiment is that in step (1), 40 transition steel slabs are sequentially loaded into the heating furnace, and the heating temperature of the duplex stainless steel continuous casting slab is controlled at 1140°C; the temperature of the duplex stainless steel continuous casting slab in the heating furnace The heating time was 3.9 hours. The time interval between the adjacent duplex stainless steel continuous casting slabs is 88 seconds. The air-to-natural gas ratio in the step (1), that is, the air-fuel ratio, is between 0.81. The burners are divided into 9 sequentially arranged in the upper part of the furnace and 6 sequentially arranged in the lower part of the furnace.

Embodiment 3

[0051] The difference from the above embodiment is that in step (1), 45 transition steel slabs are sequentially loaded into the heating furnace, and the heating temperature of the duplex stainless steel continuous casting slab is controlled at 1150°C; the temperature of the duplex stainless steel continuous casting slab in the heating furnace is The heating time was 3.8 hours. The time interval between adjacent duplex stainless steel continuous casting slabs is 86 seconds. The air-to-natural gas ratio in the step (1), that is, the air-fuel ratio, is 0.82.

[0052] The burners are divided into 9 sequentially arranged in the upper part of the furnace and 6 sequentially arranged in the lower part of the furnace.

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Abstract

The invention belongs to the field of metal press working, and in particular relates to a method for heating a double-phase stainless steel continuous casting billet. The method comprises the following steps: (1) successively loading transition billets in a heating furnace, and adjusting the ratio of air and natural gas used for combustion as well as the temperature of the heating furnace; (2) after ending loading the transition billets, loading the double-phase stainless steel continuous casting billet into the furnace, and controlling the heating temperature of the double-phase stainless steel continuous casting billet between 1100 and 1200 DEG C; (3) after ending loading the double-phase stainless steel continuous casting billet, loading at least 30 transition billets in the heating furnace. When being heated, the transition billets and the double-phase stainless steel continuous casting billet are continuously pushed into a discharging opening to be out from the furnace. The heating time can be ensured by controlling the tapping interval of the heating furnace; the tapping interval of the heating furnace is controlled within 80-90s. By the matching of the above manner, the quality of the finished product of the double-phase stainless steel continuous casting billet after being heated is greatly improved; the working efficiency is improved.

Description

Technical field [0001] The invention belongs to the field of metal pressure processing, and specifically relates to a heating method of duplex stainless steel continuous casting billet. Background technique [0002] Heating of duplex stainless steel continuous cast billet before rolling plays an important role in ensuring the quality of rolled steel. Duplex stainless steel has a two-phase structure of ferrite and austenite and has relatively poor thermoplasticity. If the heating process is not properly controlled, the grains of the steel billet will easily grow, causing the bonding force between the grains to weaken. [0003] Duplex stainless steel continuous cast slabs need to be heated before rolling. Generally, heating equipment adopts continuous heating furnace. However, during the heating process, especially for heating furnaces that use natural gas as fuel, if the control is not good, it is easy to cause "overheating" of the duplex stainless steel continuous casting ...

Claims

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Application Information

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IPC IPC(8): C21D9/70C21D1/34
Inventor 顾建林高亦斌吉建军丁斌华吴明华陈根保杜雯雯刘战英
Owner YONGXING SPECIAL STAINLESS STEEL
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