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Normalized steel for resistance welding petroleum case pipe with low yield ratio, resistance welding casing tube and its manufacturing method

A technology of oil casing and low yield ratio, which is applied in the direction of casing, drilling pipe, manufacturing tools, etc., and can solve problems such as difficult to achieve

Active Publication Date: 2008-09-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for ordinary carbon or low alloy steel, it is difficult to meet this requirement

Method used

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  • Normalized steel for resistance welding petroleum case pipe with low yield ratio, resistance welding casing tube and its manufacturing method
  • Normalized steel for resistance welding petroleum case pipe with low yield ratio, resistance welding casing tube and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0043] The molten steel after converter smelting and out-of-furnace refining is treated with Ca and continuously cast into billets. The continuous casting slab is heated at 1200-1250°C and then hot-rolled into a strip with a thickness of 10mm. The final rolling temperature is greater than 850°C. After rolling, the strip is cooled to 570°C by laminar flow and coiled into a coil. After shearing butt welding, coil forming, and ERW pipe making, the steel pipe is normalized at 880-1100°C and held for 40 minutes, and then the steel pipe is thermally straightened, and the heat straightening temperature is greater than 400°C. Finally, the steel pipe is cooled in the air and processed to obtain the low yield ratio electric resistance welded petroleum casing of the present invention.

[0044] See Table 2 for the chemical composition of the normalized steel used for resistance welding petroleum casing with low yield ratio in Examples 1-4 of the present invention.

[0045] The chemical c...

Embodiment 5

[0052] Carry out mechanical performance test to the hot-rolled coil in embodiment 1-4 and comparative example 1-2, its result is shown in table

[0053] Table 4 The mechanical properties of hot-rolled coils of Examples 1-4 and Comparative Examples 1-2

[0054]

Embodiment 6

[0056] The mechanical property tests were carried out on the normalized heat-treated resistance welded petroleum casing obtained in Examples 1-4 and Comparative Examples 1-2, and the results are shown in Table 5.

[0057] The bushing mechanical property of table 5 embodiment 1-4 and comparative example 1-2

[0058]

[0059] Combining Table 2, Table 3 and Table 5, it can be concluded that the strength of the resistance welded petroleum casing obtained in Examples 1 to 4 all meets the requirements that the yield strength Rt0.5 is between 379 and 552 MPa, and the tensile strength Rm is greater than or equal to 655 MPa. Its yield strength is relatively low. The V content of Comparative Example 1 is slightly low, and the tensile strength of the material cannot meet the requirements, while the V content of Comparative Example 2 is too high, resulting in excessive strength of the material.

[0060] It can be seen from Table 4 and Table 5 that due to the normalizing heat treatment...

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Abstract

The invention provides an air hardening steel for oil casing with low yield ratio electrical resistance welding (ERW), an oil casing with low yield ratio electrical resistance welding which is made of the air hardening steel and a preparation method of oil casing. The components of the air hardening steel for oil casing with low yield ratio electrical resistance welding (ERW) in weight percent comprises: 0.19 to 0.29 percent of Carbon, 0.1 to 0.4 percent of Silicon, 1.0 to 1.3 percent of Manganese, less than or equal to 0.015 percent of Phosphorus, smaller than 0.008 percent of Sulfur, 0.002 to 0.04 percent of Aluminum, 0.001 to 0.01 percent of Calcium, 0.08 to 0.14 percent of Vanadium, the remaining part is Ferrum and other inevitable purities. The air hardening steel of the chemical proportion is adopted, continuously casted to form blank, the normalizing heat treatment is carried out for the entire casing after ERW of casing, and then the oil casing with low yield ratio electrical resistance welding of the invention is fabricated out. The yield strength of the oil casing is between 379 to 552 Megapascal, the tensile strength is greater than or equal to 655 Megapascal, and the oil casing has the moderate carbon equivalent and the stable mechanical property of the entire casing.

Description

technical field [0001] The invention relates to a steel for oil casing, in particular to a normalizing steel for electric resistance welding (ERW) oil casing, more specifically, to a kind of steel for electric resistance welding (ERW) oil casing with low yield ratio A normalized steel, a low-yield-ratio electric resistance welded (ERW) oil casing made of the steel, and a method for making the casing. Background technique [0002] Oil and gas development casings are generally produced and supplied according to API standards. According to the API standard, there are two types of K55 steel grade petroleum casing, seamless pipe and welded pipe. Compared with seamless pipes, welded pipes 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. But for K55 ERW casing, due to the high difficult...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/14E21B17/00B21B37/74C21D1/28C21D8/00C21D9/08B21D3/00
Inventor 田青超董晓明丁维军
Owner BAOSHAN IRON & STEEL CO LTD
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