起重機臂架用高強韌性CS-Q890無縫鋼管的研發(fā)

Research and Development of High Strength/High Toughness CS-Q890 Seamless Steel Tube for Crane Boom Fabrication

摘要: 介紹了起重機臂架用高強韌性CS-Q890無縫鋼管的特點、生產(chǎn)工藝和質(zhì)量情況。通過成分優(yōu)化設(shè)計并采用“轉(zhuǎn)爐/電爐冶煉→LF鋼包精煉→VD真空精煉→圓坯連鑄→Φ159 mm三輥限動芯棒連軋管機組/Φ180 mm Accu-Roll軋管機組軋制→調(diào)質(zhì)熱處理”工藝生產(chǎn)的CS-Q890無縫鋼管，不僅可滿足高強韌性的匹配，同時還具備良好的焊接性能。該品種的成功開發(fā)，減少了國內(nèi)為開發(fā)大型起重機而長期對國外高強韌性無縫鋼管的依賴。

Abstract: Elaborated in the essay are the characteristics, manufacturing process and quality of the hi-strength/hi-toughness CS-Q890 seamless steel tube for crane boom fabrication. The tube is of well-mated high strength and high toughness and excellent weldability owing to optimization of the chemical composition, and adaption of the manufacturing process of converter/EAF melting→LF refining→VD refining→CC round→rolling with the Φ159 mm 3-roll retained mandrel mill/the Φ180 mm Accu-Roll mill→quenching-and-tempering treatment. The successful development of this type of product has brought about the possibility for being free of the long-time dependence on import of similar products for home-made large cranes.