采用CSP工藝生產(chǎn)的Nb-Ti復(fù)合微合金X60鋼級管線鋼的組織和性能

Structure and Properties of Nb-Ti Compound Micro-alloyed X60 Steel for Linepipe Purpose as Produced with CSP Process

摘要: 測試分析了采用CSP(Compact Strip Production)工藝生產(chǎn)的Nb-Ti復(fù)合微合金X60鋼級管線鋼的組織和性能。結(jié)果表明,與傳統(tǒng)工藝生產(chǎn)的同類產(chǎn)品相比,CSP工藝生產(chǎn)的這種管線鋼各向異性小,橫向和縱向的抗拉強度及屈服強度差值都小于15MPa;具有優(yōu)良的斷裂韌性和抗氫致開裂及抗硫化物應(yīng)力腐蝕開裂性能;高頻電阻焊接制管后,焊縫和熱影響區(qū)的組織為PF+P,焊縫的沖擊功平均值為109J,焊縫對溝狀腐蝕不敏感。

Abstract: Tested and analyzed are the structure and properties of the Nb-Ti compound micro-alloyed X60 steel for linepipe purpose as produced with the CSP (Compact Strip Production) process. The result demonstrates that compared with the similar products as made with the conventional processes, the said CSP process-produced X60 steel possesses such properties as slight differences between the properties in different directions, e.g., the differences of both tensile strength and yield strength between the transversal and the longitudinal are ≤15 MPa, and excellent fracture toughness and HIC and SSCC resistances. The properties of the HFW pipe made of the said steel are: PF +P structure of both the weld seam and the heat-affected area, average impact value: 109 J and in- sensitivity to the stench-shaped corrosion, etc.