Transactions of Materials and Heat Treatment

Title：Development of extra-thick composite steel plate for extra-large size plate vulcanizing machine

Authors： Wu Zaoqin1 Kong Lingyi2 Wang Lei3 Luo Zong′an2

Unit： 1. Tangshan Wenfeng Special Steel Co. Ltd. 2. Northeastern University 3. Hebei University of Technology

KeyWords： composite rolling extra-large size plate vulcanizing machine extra-thick composite plate pre-heating speed before welding

ClassificationCode：TG335.5

year,vol(issue):pagenumber：2024,49(6):149-154

Abstract：

By adopting pre-heating before welding, vacuum electron beam welding, heating at low heating rate, rolling with reasonable pass reduction rate and heat treatment process, the 45 steel ultra-thick composite steel plate of extra-large size（170 mm×3420 mm×10620 mm）plate vulcanizing machine was successfully produced. Its average hardness is 199 HB. The distribution of matrix inclusions in the upper and lower composite surfaces is similar to that in the middle of the whole plate, and the result of metallurgical bonding is good. The microstructure is relatively uniform after tempering, and the plate meets the requirements of level I flaw detection in GB/T 2970—2016. However, the research shows that the unreasonable pre-heating speed before welding aggravates the deformation of blank during the vacuum welding. When the temperature is low and the microstructure stress is large, the cracks at surface areas occur easily. In addition, these types of cracks are difficult to eliminate during the rolling process, so it is necessary to control the pre-heating speed before welding reasonably.

Funds：

河北工业大学教改项目（209634110）

作者简介：邬早勤（1982-），男，硕士，高级工程师,E-mail：wuzaoqin@163.com

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