焊管
銲管
한관
WELDED PIPE AND TUBE
2014年
10期
5-10
,共6页
牛爱军%罗卓辉%毕宗岳%牛辉%黄晓辉%刘海璋
牛愛軍%囉卓輝%畢宗嶽%牛輝%黃曉輝%劉海璋
우애군%라탁휘%필종악%우휘%황효휘%류해장
深海管线用钢%X70钢%大壁厚%热机械控制工艺(TMCP)%微观组织%力学性能
深海管線用鋼%X70鋼%大壁厚%熱機械控製工藝(TMCP)%微觀組織%力學性能
심해관선용강%X70강%대벽후%열궤계공제공예(TMCP)%미관조직%역학성능
pipeline steel for deep water%X70 steel%heavy wall thickness%thermo mechanical control process (TMCP)%microstructure%mechanical properties
通过对深海管线服役工况的分析，总结了深海用管线钢的技术特点，表明高强度、大壁厚、小径厚比管线钢管是深海用管线钢管的发展趋向。通过采用低C高Mn， Nb和Ti微合金化的成分设计和TMCP工艺控制，开发出了深水用X70钢级、厚壁36.5 mm管线钢，其全壁厚组织以均匀细小的针状铁素体＋少量M/A岛为主。对钢板进行了实物力学性能测试，测试结果显示：屈服强度480～550 MPa，屈强比≤0.82，-20℃下冲击功410 J以上，横向和纵向DWTT断口纤维率为100%，该深海管线用X70厚壁管线钢达到高强度、低屈强比、高韧性和优良低温抗动态撕裂能力的良好匹配。
通過對深海管線服役工況的分析，總結瞭深海用管線鋼的技術特點，錶明高彊度、大壁厚、小徑厚比管線鋼管是深海用管線鋼管的髮展趨嚮。通過採用低C高Mn， Nb和Ti微閤金化的成分設計和TMCP工藝控製，開髮齣瞭深水用X70鋼級、厚壁36.5 mm管線鋼，其全壁厚組織以均勻細小的針狀鐵素體＋少量M/A島為主。對鋼闆進行瞭實物力學性能測試，測試結果顯示：屈服彊度480～550 MPa，屈彊比≤0.82，-20℃下遲擊功410 J以上，橫嚮和縱嚮DWTT斷口纖維率為100%，該深海管線用X70厚壁管線鋼達到高彊度、低屈彊比、高韌性和優良低溫抗動態撕裂能力的良好匹配。
통과대심해관선복역공황적분석，총결료심해용관선강적기술특점，표명고강도、대벽후、소경후비관선강관시심해용관선강관적발전추향。통과채용저C고Mn， Nb화Ti미합금화적성분설계화TMCP공예공제，개발출료심수용X70강급、후벽36.5 mm관선강，기전벽후조직이균균세소적침상철소체＋소량M/A도위주。대강판진행료실물역학성능측시，측시결과현시：굴복강도480～550 MPa，굴강비≤0.82，-20℃하충격공410 J이상，횡향화종향DWTT단구섬유솔위100%，해심해관선용X70후벽관선강체도고강도、저굴강비、고인성화우량저온항동태시렬능력적량호필배。
Through analysis of deep-sea pipeline service conditions,it summarized the technical characteristics of deep-sea pipeline steel,and showed that high strength, heavy wall thickness and small diameter-thickness ratio are the development trend for deep-sea pipeline steel pipe. By using high Mn,low C and Nb,Ti micro-alloying composition design,and TMCP process,the X70 pipeline steel with 36.5 mm thickness used in deep-sea pipeline was developed. The main microstructure of full thickness consists of uniform fine acicular ferrite and a small number of M/A island. The yield strength of steel plate arrives 480~550 MPa,the yield ratio≤0.82,the impact energy over 410 J at -20 ℃,the fiber fracture rate is 100% of horizontal and vertical DWTT, which achieves good matching with high strength,low yield ratio,high toughness and excellent dynamic tear resistance at low temperature.
