According to the requirements of SY/T 6952.2-2013 standard and working conditions of heavy oil thermal recovery wells

Daye Special Steel Co Ltd successfully produces a kind of grade 110SH-1 thermal recovery casing with high strength and toughness by using 0.9 ~ 1.2Cr-0.3 ~ 0.6 Mo-based low alloy + Nb-Ti-V respectively 0. 01 〜0. 05 composition design of microalloy to reduce the use of precious alloy and production cost. The Φ 177.8 mmx 9.19 mm seamless steel pipe is produced by process of "70 t EAF →LF + VDC→CM Φ230 mm bloom →CPE mill rolling→quenching and tempering heat treatment"

according to the test results it is defined that the quenching temperature 920 ℃

water cooling

tempering temperature 660℃

air cooling process. The results show that the conventional performance

high-temperature anticreep performance

full-size blasting

full-size crushing and other test results of the steel grade thermal recovery casing fully meet the requirements of SY/T 6952. 2-2013 industry standard.