Improvement in steel weldability for large diameter thick-walled gas pipelines by optimizing chemical composition

被引：0
|
作者：
P. P. Stepanov
V. N. Zikeev
L. I. Efron
I. I. Frantov
Yu. D. Morozov
机构：
[1] Vyksa Metallurgical Plant,
[2] Bardin Central Research Institute of Ferrous Metallurgy,undefined
来源：
Metallurgist | 2011年 / 54卷
关键词：
gas pipeline; thick wall; welded joint; heat-affected zone; impact strength; low-carbon bainite; alloying with solid solution elements; microalloying with carbide-forming elements;
D O I：
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学科分类号：
摘要：
The problem is considered of improving impact strength and brittle failure resistance of heat-affected zone (HAZ) metal during welding of thick-walled (30–40 mm) gas pipelines. It is shown that the best HAZ properties are obtained in the case of forming low-carbon bainite in this zone with slow post-welding cooling rates. The carbon content is reduced in pipe steel for this purpose; solid solution elements are added, which increase austenite stability, and microalloying with niobium and titanium is carried out in order to retard grain growth by carbonitride particles.
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页码：767 / 774
页数：7
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