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Rolling heating process for stainless steel for soldering

A heating method and stainless steel technology, applied in the field of rolling and heating of stainless steel for welding, can solve the problems of low yield and achieve the effects of stable yield, reducing rolling cracking, and improving thermoplasticity

Active Publication Date: 2009-01-14
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiency that the existing rolling heating method of welding stainless steel causes cracking during hot rolling, resulting in low yield, the present invention provides a rolling heating method of welding stainless steel that can significantly reduce the cracking during hot rolling

Method used

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  • Rolling heating process for stainless steel for soldering
  • Rolling heating process for stainless steel for soldering
  • Rolling heating process for stainless steel for soldering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The chemical composition (percentage by weight) of the EQ309L stainless steel blank of the present embodiment is:

[0025] C: 0.025% Si: 0.70% Mn: 2.10% P: 0.025% S: 0.010%

[0026] Cr: 23.10% Ni: 13.00% N: 0.06% The remainder is Fe and unavoidable impurities.

[0027] The rolling heating method embodiment of this EQ309L stainless steel is the following sequential steps

[0028] (1) First heating: heat the EQ309L stainless steel billet in a walking continuous heating furnace, heat the continuous casting billet to 1100°C for 180 minutes, and cool the EQ309L stainless steel billet out of the heating furnace to room temperature.

[0029] (2) The second heating: the cooled EQ309L continuous casting slab is put back into the walking continuous heating furnace for heating, and the continuous casting slab is heated to 1250°C for 180 minutes, and rolled out of the heating furnace.

[0030] (3) Rolling: Send the continuously cast steel billet after being released from the furn...

Embodiment 2

[0032] The chemical composition (percentage by weight) of the EQ309L stainless steel blank of the present embodiment is:

[0033] C: 0.020% Si: 0.75% Mn: 2.30% P: 0.020% S: 0.005%

[0034] Cr: 23.20% Ni: 12.80% N: 0.05% The remainder is Fe and unavoidable impurities.

[0035] The rolling heating method embodiment of this EQ309L stainless steel is the following sequential steps:

[0036] (1) First heating: heat the EQ309L stainless steel billet in a walking continuous heating furnace, heat the continuous casting billet to 1130°C for 200 minutes, and cool the EQ309L stainless steel billet out of the heating furnace to room temperature.

[0037] (2) Second heating: put the cooled EQ309L continuous casting slab into the walking continuous heating furnace again, heat the continuous casting slab to 1220°C for 220 minutes, and roll out of the heating furnace.

[0038] (3) Rolling: Send the continuously cast steel billet after being released from the furnace into a plate hot rolling...

Embodiment 3

[0040] The chemical composition (percentage by weight) of the EQ309L stainless steel blank of the present embodiment is:

[0041] C: 0.018% Si: 0.75% Mn: 2.250% P: 0.017% S: 0.008%

[0042] Cr: 23.250% Ni: 13.50% N: 0.07% The rest is Fe and unavoidable impurities.

[0043] The rolling heating method embodiment of this EQ309L stainless steel is the following sequential steps:

[0044] (1) First heating: heat the EQ309L stainless steel billet to 1150°C in a walking continuous heating furnace for 180 minutes, then cool the EQ309L stainless steel billet out of the heating furnace to room temperature.

[0045] (2) The second heating: the cooled EQ309L continuous casting slab is put back into the walking continuous heating furnace, the continuous casting slab is heated to 1240°C, heated for 190 minutes, and rolled out of the heating furnace.

[0046] (3) Rolling: Send the continuously cast steel billet after being released from the furnace into a plate hot rolling mill, and roll i...

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Abstract

The invention relates to a rolling and heating method for stainless steel used for welding, in particular to a rolling and heating method for 309 L stainless steel. The rolling and heating method comprises the following steps sequentially that firstly, the first heating is performed, the stainless steel casting billet used for welding is heated in a step-by-step type continuous heating furnace, the continuous casting billet is heated to DEG C 1100 to 1150 DEG C, the heating time is between 180 minutes and 220 minutes, and the stainless steel casting billet used for welding is cooled down to the room temperature after being taken out of the heating furnace; secondly, the second heating is performed, the continuous casting billet after being cooled is positioned into the continuous heating furnace again, to heat the casting billet to 1200 DEG C to 1250 DEG C, and the casting billet is taken out of the heating furnace after the heating time of 180 minutes to 220 minutes. The casting billet is rolled into steel bands or wire rods after being taken out of the heating furnace. By adopting the rolling and heating method for stainless steel used for welding, the rolling cracking during rolling is obviously reduced, and the yield of good steels is enhanced.

Description

technical field [0001] The invention relates to a rolling heating method of stainless steel for welding, especially a rolling heating method of 309L stainless steel. Background technique [0002] In order to improve weldability and reduce welding cracks in welding steel, it is required that the weld structure is mainly austenite during welding, but there must be a certain amount of ferrite. As the second phase in steel, ferrite can prevent the development of microscopic cracks in the weld, thereby avoiding welding cracks. EQ309L or E309L stainless steel is the steel with the highest ferrite content in welding materials. Generally, the ferrite content in welding materials is required to be 3-10%, while the ferrite content in EQ309L or E309L stainless steel is required to be 12-15%. If the ferrite content of stainless steel exceeds 10% at the hot working temperature, due to the different deformation characteristics of ferrite and austenite, and the fact that the ferrite grain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00
Inventor 王辉绵赵海泉郭永亮
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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