Solidification Structure Optimization of 304 Stainless Steel

Wu Qingyu; Zhao Jing; L&#252; Junjie; Zhao Ziyu

doi:10.7513/j.issn.1004-7638.2018.01.022

Volume 39 Issue 1

Feb. 2018

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Wu Qingyu, Zhao Jing, Lü Junjie, Zhao Ziyu. Solidification Structure Optimization of 304 Stainless Steel[J]. IRON STEEL VANADIUM TITANIUM, 2018, 39(1): 124-129. doi: 10.7513/j.issn.1004-7638.2018.01.022

Citation:

Wu Qingyu, Zhao Jing, Lü Junjie, Zhao Ziyu. Solidification Structure Optimization of 304 Stainless Steel[J]. IRON STEEL VANADIUM TITANIUM, 2018, 39(1): 124-129. doi: 10.7513/j.issn.1004-7638.2018.01.022

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Solidification Structure Optimization of 304 Stainless Steel

doi: 10.7513/j.issn.1004-7638.2018.01.022

1. School of Metallurgical Engineering, Tangshan Vocational College of Science and Technology, Tangshan 063001, Hebei, China;
2. Long Products Department of Tangshan Iron and Steel Corporation, Hebei Iron and Steel Group, Tangshan 063016, Hebei, China

Received Date: 2017-04-25

Abstract

Abstract

In order to reduce the crack of 304 austenitic stainless steel pipe,the experiments of composition optimization,F-EMS and superheat controlling have been done to optimize solidification structure.The area fraction of δ ferrite in structure of billet center decreases from 8.6 % to 7.2 % through composition optimization. By implement of F-EMS,The area fraction of δ ferrite in structure of billet center decreases to 5.8 % and distributes dispersively,the δ ferrite in the billet without F-EMS is net-like. The superheat between 30 ℃ and 40 ℃ is beneficial to reduce δ ferrite. The amount of δ ferrite in 304 billets decreases significantly by using above measures and the crack during piercing is improved significantly.
- 304 stainless steel,
- solidification structure,
- F-EMS,
- superheat,
- composition optimization