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Application of niobium-molybdenum strengthening mechanisms in high strength linepipe steels.
- Source :
-
Rivista Italiana della Saldatura . mag/giu2015, Vol. 67 Issue 3, p323-331. 9p. - Publication Year :
- 2015
-
Abstract
- The synergistic effects of niobium and molybdenum in lowering austenite-to-ferrite transformation temperatures have been known for approximately 45 years. The benefits have been widely exploited in linepipe steels since 1971 when 485 MPa (X70) linepipe produced by IPSCO [1] was installed in Canada in the TransCanada and Novacorp gas transmission systems. At that time the steels were cast as semi-killed ingots and had inferior transverse Charpy properties due to the presence of MnS and silicate inclusions. Other applications have been found in hot-rolled long products [2] and Nippon Steel's HT80 quenched and tempered plate [3,4], As linepipe yield strengths have increased to X80, X100 and above, and carbon contents have been reduced to 0.03-0.06 percent, the Nb-Mo combination has become indispensable for producing economical steels when used in combination with chromium, copper and nickel. This paper provides a brief chronology o f the adoption of Nb-Mo and Nb-Mo-B alloying since the mid 1960s. [ABSTRACT FROM AUTHOR]
- Subjects :
- *NIOBIUM
*MOLYBDENUM
*STEEL pipe
*AUSTENITE
Subjects
Details
- Language :
- English
- ISSN :
- 00356794
- Volume :
- 67
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Rivista Italiana della Saldatura
- Publication Type :
- Academic Journal
- Accession number :
- 103261566