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Biphasic stainless steel line pipe with yield strength of 555 MPa or above and manufacturing method thereof

A duplex stainless steel, yield strength technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problem of high cost

Inactive Publication Date: 2015-01-07
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of alloying elements such as Ni and Mo in the austenitic stainless steel in the above-mentioned patent documents is very high, so the cost of the austenitic stainless steel is very high

Method used

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  • Biphasic stainless steel line pipe with yield strength of 555 MPa or above and manufacturing method thereof
  • Biphasic stainless steel line pipe with yield strength of 555 MPa or above and manufacturing method thereof
  • Biphasic stainless steel line pipe with yield strength of 555 MPa or above and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1-A17 and comparative example B1-B5

[0042] The duplex stainless steel linepipes in Examples A1-A17 and Comparative Examples B2-B5 were fabricated as follows:

[0043] 1) smelting: control the mass percentage distribution of each chemical element in Examples A1-A17 and Comparative Examples B1-B5 as shown in Table 1;

[0044] 2) Pipe making: making raw materials into seamless steel pipes;

[0045] 3) Quenching: heat the steel pipe to a temperature above 900°C for 30 minutes, and cool it to below 150°C with a cooling rate above air cooling;

[0046] 4) Tempering: Temper the steel pipe at 610-670°C for a holding time of 60 minutes;

[0047] 5) The volume percentage content of ferrite in each steel pipe obtained after air cooling is shown in Table 3.

[0048] The specific process parameters involved in the above steps are shown in Table 2.

[0049] The duplex stainless steel (ferrite + austenite) linepipe of Comparative Example B1 was manufactured and implemented according to the following steps:

[0050] 1) Smel...

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Abstract

The invention discloses a biphasic stainless steel line pipe with yield strength of 555 MPa or above. The microstructure of the biphasic stainless steel line pipe is martensite and ferrite, and the biphasic stainless steel line pipe comprises the following chemical elements in percentage by mass: 0.03-0.07% of C, 0.1-0.4% of Si, 0.1-0.5% of Mn, 13.5-15.0% of Cr, 0.6-1.5% of Ni, 0.2-1.0% of Mo, 0.002-0.08% of N, and the balance of Fe and inevitable impurity elements, wherein the mass percentage compositions of the elements meets a formula that Cr+1.5Mo+2Ni+16 N is greater than or equal to 16.5, Ni-3(C+N) is greater than or equal to 0.5, and Nb+V+Ti is less than or equal to 0.1. The invention also provides a manufacturing method of the biphasic stainless steel line pipe with yield strength of 555 MPa or above. The line pipe disclosed by the invention is high in intensity and good in corrosion resistance and crack resistance.

Description

Technical field [0001] The present invention relates to a stainless steel pipe and a manufacturing method thereof, in particular to a duplex stainless steel pipe and a manufacturing method thereof. Background technique [0002] With the continuous development of oil and gas development in my country, containing more CO 2 , a small amount of H 2 S and Cl - The number of highly corrosive oil and gas resources being exploited continues to increase. In addition, since many oil and gas resources are located in relatively cold areas, during winter operations, the temperature can reach minus 20 degrees Celsius or even lower. In response to such harsh environments, gathering and transportation pipelines that transport oil and gas resources from wellheads to centralized processing stations generally require high-alloy products to meet corrosion resistance requirements, such as super martensitic stainless steel or duplex stainless steel. However, for some areas where the abundance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C21D1/18C21D8/10
CPCC22C38/44C21D1/18C21D9/085C22C38/001
Inventor 张春霞张忠铧蔡海燕刘耀恒许轲
Owner BAOSHAN IRON & STEEL CO LTD
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