Electric resistance welding petroleum casing pipe
A petroleum casing and resistance welding technology, which is applied in the direction of resistance welding equipment, casing, drill pipe, etc., can solve the problems of unfavorable plate roll head and tail shear butt welding, and the inability to reflect the superiority of welded casing production efficiency, etc. Achieve the effect of low alloy cost, stable mechanical properties and moderate carbon equivalent
Active Publication Date: 2012-05-30
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
A paper in the fifth issue of "Sichuan Metallurgy" in 2002 (the title of the article is the production process characteristics of K55 and the development of M65, the author is Luo Xiandeng) discloses the production of M65 seamless steel pipes with 37Mn2V, but due to the composition of carbon The equivalent is greater than 0.6, which is not conducive to the shear butt welding of the head and tail of the coil, and can only be produced in a single coil, which cannot reflect the superiority of the production efficiency of the welded sleeve.
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[0036] The chemical compositions of the examples and comparative examples are shown in Table 1. After converter steelmaking and out-of-furnace refining, the molten steel is treated with Ca and continuously cast into slabs. The continuous casting slabs are heated at 1200-1250° C. and then hot-rolled into strips with a thickness of 10 mm. The final rolling temperature is higher than 850°C. After rolling, the strip is cooled by laminar flow to 570°C for coiling. The mechanical properties are shown in Table 2. After shearing butt welding, steel pipe forming and welding pipe making (welding temperature 1350-1500°C, welding speed 15-20m / min), and then quenched and tempered at 880-920°C and tempered at 650-690°C, The mechanical properties are shown in Table 3. The steel pipe strengths of the two whole-pipe heat treatments in Examples 1-4 all meet the requirements that the yield strength is between 448-586 MPa and the tensile strength is ≥ 586 MPa. The C content in Comparative Exampl...
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Abstract
The invention discloses steel for a petroleum casing pipe and an electric resistance welding petroleum casing pipe. The steel comprises the following elements in percentage by weight: 0.19-0.29 percent of C, 0.1-0.4 percent of Si, 1.0-1.4 percent of Mn, not greater than 0.0.15 percent of P, not greater than 0.008 percent of S, 0.002-0.040 percent of Al, 0.001-0.010 percent of Ca and the balance of Fe and inevitable impurities, and the carbon equivalent is 0.4-0.5. The steel for the petroleum casing pipe can be suitable for a shearing butt welding process, and the electric resistance welding petroleum casing pipe meets the M65 steel-level requirement. The invention also discloses manufacture methods for the steel for the petroleum casing pipe and the electric resistance welding petroleum casing pipe.
Description
technical field [0001] The invention relates to a steel for oil casing, in particular to a steel for oil casing and a manufacturing method thereof, and an M65 steel grade electric resistance welded oil casing made of the steel and a manufacturing method thereof. Background technique [0002] According to the API standard, oil casing is divided into two types: seamless pipe and welded casing. Compared with seamless pipes, one of the most notable features of welded casings is good wall thickness and dimensional accuracy. Therefore, it is inherently superior to use them in the production of oil casings with high crush resistance. At the same time, welded casings are also It has the advantages of high production efficiency, wide specification range, and low cost. Therefore, welded casing has become the first choice of manufacturers and oilfield users, and has been favored by the market. [0003] The basic production process of welded casing is: steel pipe forming - online weldi...
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IPC IPC(8): C22C38/06C22C33/04C21C7/076C21D8/10C21D1/18B21B37/74B23K11/00E21B17/00
CPCY02P10/20
Inventor 史宏德田青超董晓明
Owner BAOSHAN IRON & STEEL CO LTD