Oil bushing steel and manufacturing process thereof
A manufacturing process and oil casing technology, which is applied in the chemical composition and manufacturing process of oil casing steel, can solve the problems of low strength, low material impact toughness, increased production costs, etc., and achieve improved toughness and high structural stability , the effect of good hardenability
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[0034] The tube billet obtained by continuous casting or continuous rolling is heated in an annular heating furnace, pierced by a piercing machine, and then rolled at 950-1050 ° C, and enters a reheating furnace after being stripped off. Air-cooling after rolling by the diameter mill or stretching mill, then quenching at 860-1000°C, and then tempering at 600-660°C to make the finished tube.
[0035] Below just commonly used low-alloy steel and other steel grades are compared with the low-alloy steel of the present invention, and its chemical composition is shown in Table 2, and mechanical property is shown in Table 3, as seen the high strength and toughness performance of the steel grades of the present invention.
[0036] Table 2 Chemical Composition of Comparative Steels
[0037] serial number
[0038]
[0039] Table 3 mechanical properties
[0040]
[0041] The high-strength casing manufactured according to the above-mentioned composition and ...
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