Steel for high-frequency resistance welding oil casing and its manufacturing method

A technology of high-frequency resistance welding and oil casing, which is applied in the direction of resistance welding equipment, manufacturing tools, welding equipment, etc., can solve the problem that the resistance to sulfide stress corrosion cracking cannot be completely solved, and can improve the performance of resistance to sulfide stress corrosion cracking , refined weld grains, and low alloy cost

Active Publication Date: 2011-12-28
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

However, the above patent application only solves the technical problem of resistance to hydrogen-induc

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  • Steel for high-frequency resistance welding oil casing and its manufacturing method

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Embodiment 1

[0037] The chemical composition of embodiment 1 is shown in table 1. The molten steel is smelted in a converter, cast, heated to 1220°C and rolled into a strip, the final rolling temperature is 850°C, laminar cooling to 650°C, and rolled into a hot-rolled coil; the high-frequency resistance welding temperature is 1400°C, and the welding speed is 15m / min; the online normalizing heat treatment temperatures of the three welds are 980°C, 950°C, and 920°C respectively. The heat treatment temperature of the whole tube is 950°C, water quenching after holding for 40 minutes, tempering temperature is 720°C, and holding time is 90 minutes. The mechanical properties and sulfide stress corrosion cracking resistance are shown in Table 2.

Embodiment 2

[0039] The chemical composition of embodiment 2 is shown in Table 1. The molten steel is smelted in a converter, cast, heated to 1250°C and then rolled into a strip. The final rolling temperature is 880°C, laminar flow cooled to 680°C, and rolled into a hot-rolled coil; the high-frequency resistance welding temperature is 1300°C, and the welding speed is 12m / min; the online normalizing heat treatment temperatures of the three welds are 960°C, 950°C, and 900°C respectively. The heat treatment temperature of the whole tube is 950°C, water quenching after holding for 30 minutes, tempering temperature is 710°C, and holding time is 100 minutes. The mechanical properties and sulfide stress corrosion cracking resistance are shown in Table 2.

Embodiment 3

[0041] The chemical composition of Example 3 is shown in Table 1. The molten steel is smelted in a converter, cast, heated to 1200°C and then rolled into a strip. The final rolling temperature is 900°C, laminar flow cooled to 700°C, and rolled into a hot-rolled coil; the high-frequency resistance welding temperature is 1350°C, and the welding speed is 14m / min; the online normalizing heat treatment temperatures of the three welds are 980°C, 920°C, and 880°C respectively. The heating temperature of the whole tube heat treatment is 920°C, water quenching after holding for 50 minutes, tempering temperature is 700°C, and holding time is 110 minutes. The mechanical properties and sulfide stress corrosion cracking resistance are shown in Table 2.

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Abstract

The invention relates to steel for a high-frequency electric resistance welding petroleum casing pipe used under a hydrogen sulfide environment. The steel comprises the following components in percentage by mass: 0.15 to 0.35 percent of C, 0.1 to 0.6 percent of Si, 0.3 to 1 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, 0.1 to 0.5 percent of Mo, 0.03 to 0.2 percent of V, 0.01 to 0.05 percent of Nb, 0.01 to 0.05 percent of Ti, 0.01 to 0.08 percent of Al, 0.0005 to 0.005 percent of Ca, 0.001 to 0.003 percent of B, and the balance of Fe and inevitable impurities; and the carbon equivalent is less than or equal to 0.43. The provided steel for the petroleum casing pipe can be used for manufacturing the high-frequency electric resistance welding petroleum casing pipe of 80ksi steel level with good sulfide stress corrosion cracking resistance and can be applied to a CO2 gas protection welding process, and the subsequent production efficiency of the high-frequency electric resistance welding petroleum casing pipe is improved.

Description

technical field [0001] The invention relates to a high-frequency resistance welding petroleum casing used in a hydrogen sulfide environment, in particular to a high-frequency resistance welding petroleum casing steel used in a hydrogen sulfide environment, and the steel made of the steel 80ksi steel grade high frequency resistance welded petroleum casing and method of manufacturing the same. Background technique [0002] According to the API standard, oil casing is divided into two types: seamless pipe and welded casing. Compared with seamless pipes, high-frequency resistance-welded oil casings have remarkable features such as high production efficiency, good dimensional accuracy, wide specification range, and low cost. Therefore, they are the first choice of manufacturers and oilfield users, and have always been favored by the market. . [0003] The environment used by petroleum casing contains many corrosive media such as hydrogen sulfide, which can not only uniformly co...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D9/08C21D9/50B23P15/00B23K11/00
Inventor 董晓明田青超史宏德
Owner BAOSHAN IRON & STEEL CO LTD
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