Abstract：A corrosion-resistant nickel carbide-free bainitic steel was researched and developed, which was used for high strength and high toughness seamless steel tubes. Microstructure of the steel was consisted of carbide-free bainite, martensite and retained austenite flake, the existing of residual austenite flake enables carbide-free bainite seamless pipe to have good toughness while still maintaining high strength. For the ratio of strength to toughness can meet a variety of applications. The variation of the morphology and retained austenite content under different heat treatment systems was analyzed by Gleeble thermal simulation, X-ray diffraction and metallography.An important experimental basis was provided for the manufacture of the oil special seamless pipes with high strength, high toughness and high corrosion resistance.
F. G. Caballero,Chao, J. Cornide, et al. .Toughness of Advanced high strength bainitic steels.[J].Materials Science Forum,2010,638-642:1507-
[6]
F. G. Caballero,Chao, J. Cornide, et al. .Toughness of Advanced high strength bainitic steels.[J].Materials Science Forum,2010,638-642:1507-
[7]
G. Gomez1,T. Pe′rez1 and H. K. D. H. Bhadeshia. .Air cooled bainitic steels for strong, seamless pipes. part 1 – alloy design, kinetics and microstructure[J].Materials Science and Technology,2009,25(12):1501-
[7]
G. Gomez1,T. Pe′rez1 and H. K. D. H. Bhadeshia. .Air cooled bainitic steels for strong, seamless pipes. part 1 – alloy design, kinetics and microstructure[J].Materials Science and Technology,2009,25(12):1501-
[8]
G. Gomez1.nullT. Pe′rez1 and H. K. D. H. Bhadeshia. .Air cooled bainitic steels for strong, seamless pipes. part 2 –properties and microstructure of rolled material[J].Materials Science and Technology,2009,25(12):1508-
[8]
G. Gomez1.nullT. Pe′rez1 and H. K. D. H. Bhadeshia. .Air cooled bainitic steels for strong, seamless pipes. part 2 –properties and microstructure of rolled material[J].Materials Science and Technology,2009,25(12):1508-
2013, Vol. 48 
