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Rolling heating process for stainless steel for soldering

A heating method, stainless steel technology, applied in the field of rolling and heating of stainless steel for welding, can solve the problems of low yield, achieve stable yield, reduce stress concentration effect, and improve thermoplasticity

Active Publication Date: 2010-09-01
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 (weight percentage) of the EQ309L stainless steel billet in this embodiment is: C: 0.025% Si: 0.70% Mn: 2.10% P: 0.025% S: 0.010% Cr: 23.10% Ni: 13.00% N: 0.06% The rest are Fe and inevitable impurities.

[0025] This embodiment of the rolling heating method of EQ309L stainless steel is the following sequential steps

[0026] (1) The first heating: The EQ309L stainless steel billet is heated in a step-by-step continuous heating furnace, and the continuous casting billet is heated to 1100 ° C for 180 minutes, and the EQ309L stainless steel billet is cooled to room temperature after leaving the heating furnace.

[0027] (2) Second heating: After cooling, the EQ309L continuous casting billet is put into the step-by-step continuous heating furnace again for heating, and the continuous casting billet is heated to 1250°C for 180 minutes, and then rolled out of the heating furnace.

[0028] (3) Rolling: The continuous casting billet after being releas...

Embodiment 2

[0030] The chemical composition (weight percent) of the EQ309L stainless steel billet of the present embodiment is:

[0031] C: 0.020% Si: 0.75% Mn: 2.30% P: 0.020% S: 0.005% Cr: 23.20% Ni: 12.80% N: 0.05% The rest are Fe and inevitable impurities.

[0032] The rolling heating method embodiment of this EQ309L stainless steel is the following sequential steps:

[0033] (1) The first heating: The EQ309L stainless steel billet is heated in a step-by-step continuous heating furnace, and the continuous casting billet is heated to 1130 ° C for 200 minutes, and the EQ309L stainless steel billet is cooled to room temperature after leaving the heating furnace.

[0034] (2) Second heating: The cooled EQ309L continuous casting billet is put back into the step-by-step continuous heating furnace, and the continuous casting billet is heated to 1220°C for 220 minutes, and then rolled out of the heating furnace.

[0035] (3) Rolling: The continuous casting billet after being released from th...

Embodiment 3

[0037] The chemical composition (weight percent) of the EQ309L stainless steel billet of the present embodiment is:

[0038] C: 0.018% Si: 0.75% Mn: 2.250% P: 0.017% S: 0.008% Cr: 23.250% Ni: 13.50% N: 0.07% The rest are Fe and inevitable impurities.

[0039] The rolling heating method embodiment of this EQ309L stainless steel is the following sequential steps:

[0040] (1) The first heating: The EQ309L stainless steel billet is heated to 1150°C in a walking continuous heating furnace for 180 minutes, and the EQ309L stainless steel billet is cooled to room temperature after leaving the heating furnace.

[0041] (2) Second heating: After cooling, the EQ309L continuous casting billet is put back into the walking continuous heating furnace, and the continuous casting billet is heated to 1240°C for 190 minutes, and then rolled out of the heating furnace.

[0042] (3) Rolling: The continuous casting billet after being released from the furnace is sent to the hot plate rolling mill...

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Abstract

Disclosed is 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: firstly, the first heating is performed, a 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 1100 DEG C 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; and secondly, the second heating is performed, the cooled continuous casting billet is positioned into the continuous heating furnace again to heat the casting billet to 1200 DEG C to 1250 DEG C, the heating time is between 180 minutes to 220 minutes, and the casting billet is taken out of the heating furnace. 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 ratio is increased.

Description

technical field [0001] The invention relates to a rolling and heating method of stainless steel for welding, in particular to a rolling and heating method of 309L stainless steel. Background technique [0002] In order to improve weldability and reduce welding cracks, welding steel requires that the weld structure is mainly austenite during welding, but there must be a certain amount of ferrite. Ferrite, as a second phase in steel, can prevent the development of microscopic cracks in the weld, thereby avoiding weld 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 large grain size of ferrit...

Claims

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Application Information

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Patent Type & Authority Patents(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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