Oil sleeve steel ball and manufacturing process thereof

Abstract

The invention discloses an oil sleeve steel ball. The oil sleeve steel ball consists of the following components by weight percent: 0.28-0.36% of C, 0.17-0.32% of Si, 1.10-1.60% of Mn, less than or equal to 0.02% of P, less than or equal to 0.2% of S, less than or equal to 0.2% of Cu, less than or equal to 0.2% of Ni, less than or equal to 0.25% of Cr, less than or equal to 0.1% of Mo, less than or equal to 0.08% of V, 0.008-0.03% of Al, less than or equal to 0.15% of other elements and the balance of Fe. The manufacturing process comprises the steps of converter smelting, external refining, continuous casting of a round billet, hot rolling of seamless pipes and heat treatment of an oil sleeve pipe. 0.008-0.030% of Al is specially added in the oil sleeve steel ball for refining grains, the toughness of steel pipes is improved, and the requirement that the steel for oil sleeves by API5CT is fine-grain killed steel. The steel ball is low in steel-making cost and easy in process control, and multi-steel-grade oil sleeves of J55, M65, N80Q, L80-1, R95 and P110 with wide intensity range can be produced by a proper process, so that the marks of steel for oil sleeves can be reduced, so that the oil sleeve steel ball is economical and practical, on one hand, the management of blanks and production are facilitated, on the other hand, stocks are reduced, and overstocked funds are lowered.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel, and in particular relates to an oil casing steel grade. Background technique [0002] Because of its large market demand and its specifications that are conducive to production, oil casings are favored by the majority of seamless steel pipe manufacturers. Domestically produced oil tubing and casings are mainly based on API SPEC 5CT "Casing and Oil Pipes" issued by the American Petroleum Institute. "Specification" is the standard. In the API 5CT 9th standard, all steel grades are H40, J55, K55, N80-1, N80-Q, R95, M65, L80-1, L80-9Cr, L80-13Cr, C90-1, For T95-1, C110, P110, Q125-1, for M65, N80Q, L80-1, R95, P110 steel grade oil casing pipe body, domestic manufacturers all use steel pipes of different materials to produce oil casing pipes of different steel grades, so On the one hand, it increases the burden on the management of billets, which is not good for the production organizatio...

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Problems solved by technology

[0002] Because of its large market demand and its specifications that are conducive to production, oil casings are favored by the majority of seamless steel pipe manufacturers. Domestically produced oil tubing and casings are mainly based on API SPEC 5CT "Casing and Oil Pipes" issued by the American Petroleum Institute. "Specification" is the standard. In the API 5CT 9th standard, all steel grades are H40, J55, K55, N80-1, N80-Q, R95, M65, L80-1, L80-9Cr, L80-13Cr, C90-1, For T95-1, C110, P110, Q125-1, for M65, N80Q, L80-1, R95, P110 steel grade oil casing pipe body, domestic manufacturers all use steel pipes of different materials to produce oil casing pipes of different steel grades, so On the one hand, it increases the burden on the management of billets, which is not good for the production organization. On the other hand, many companies add many alloying elements (such as Cr, Mo, V, etc.) to the quenched and tempered steel for production. Good, but its cost is too high, not conducive to market competition

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