提高厚壁鍋爐管沖擊性能的措施

Measures to Improve Impact Property of Heavy - wall Boiler Steel Pipe

摘要: 分析了厚壁鍋爐管沖擊性能較低的原因。討論矯直溫度、工藝控制措施、終軋溫度等對厚壁鍋爐管沖擊性能的影響,并對比分析了沖擊性能合格與不合格產(chǎn)品的顯微組織。研究結(jié)果表明,通過采取矯直時避開350℃脆性溫度區(qū)、采用較小壓下量、降低終軋溫度、控制魏氏組織形成等措施,可明顯地提高厚壁鍋爐管的沖擊性能。

Abstract: Analyzed in the paper are the elements responsible for the low impact property of the heavy-wall boiler pipe. Such elements which negatively influence the impact property of the said pipe include the straightening temperature, relevant process control measures and the final-rolling temperature, etc. The macrostructure of the pipe with qualified impact property is compared with that of the pipe with unqualified impact property. The result of the study shows that the impact property of the heavy-wall boiler pipe will be significantly increased by means of such measures as avoiding straightening within the 350 ℃ brittle temperature zone, adopting rather small screwdown amount, reducing the final rolling temperature, and properly controlling of forming of Widmannstatten structure,etc.