High strength super-martensitic stainless steel for oil and gas pipelines and preparation method thereof

The technology of a martensitic stainless steel and a manufacturing method is applied in the field of metal materials, which can solve the problems of high content, accidents and high cost, and achieve the effects of simple heat treatment process, high strength and toughness, and lower production costs.

Inactive Publication Date: 2011-01-26
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Usually 410 or 420 martensitic stainless steel can meet the strength required by casing and tubing for general oil and gas wells, but it cannot reach the yield strength of not less than 759MPa required in deep wells and ultra-deep wells, and its toughness is low. Breakage often occurs in the cycle, causing accidents
In order to solve the above problems, an improved martensitic stainless steel has been proposed, which has certain improvements in mechanical strength and corrosion resistance, but...

Method used

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  • High strength super-martensitic stainless steel for oil and gas pipelines and preparation method thereof
  • High strength super-martensitic stainless steel for oil and gas pipelines and preparation method thereof

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Embodiment 1

[0044] A high-strength and tough super martensitic stainless steel for oil and gas pipelines, its main chemical composition (mass%) is: C: 0.014%, Si: 0.19%, Mn: 0.59%, Cr: 13.86%, Ni: 5.06%, Mo: 1.92%, P: 0.013%, S: 0.015%, N: 0.06%, Nb: 0.06, W: 0.04%, and the remainder is composed of Fe and unavoidable impurities.

[0045] The manufacturing method of the above-mentioned super martensitic stainless steel includes smelting and casting the materials of the above-mentioned components, forging or rolling at an initial temperature of 1200°C, and a final forming temperature of 950°C, and then forming after heat treatment; the heat treatment process includes: ( 1) Quenching, heating to 980°C for 0.5 hours, and air cooling; (2) Tempering, slowly heating to 590°C, holding for 2 hours, then cooling to room temperature in the air, then finishing, so as to obtain high-strength super martensite Stainless steel.

[0046] The mechanical properties of the super martensitic stainless steel ...

Embodiment 2

[0048] A high-strength super martensitic stainless steel for oil and gas pipelines, its main chemical composition (mass%) is: C: 0.024%, Si: 0.68%, Mn: 0.74%, Cr: 12.81%, Ni: 6.41%, Mo: 2.44%, P: 0.012%, S: 0.02%, N: 0.04%, Nb: 0.20%, W: 0.03%, and the remainder consists of Fe and unavoidable impurities.

[0049] The manufacturing method of the above-mentioned super martensitic stainless steel includes smelting and casting the materials of the above-mentioned components, forging or rolling at an initial temperature of 1200°C, and a final forming temperature of 950°C, and then forming after heat treatment; the heat treatment process includes: ( 1) Quenching, heating to 1000°C for 0.5 hours, air cooling; (2) Tempering, slowly heating to 620°C, holding for 2 hours, then cooling to room temperature in the air, then finish machining, so as to obtain high strength, toughness and high corrosion resistance super martensitic stainless steel.

[0050] The mechanical properties of the s...

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Abstract

The invention relates to high strength super-martensitic stainless steel for oil and gas pipelines and a preparation method thereof. The super-martensitic stainless steel consists of the following chemical compositions in percentage by mass: 0.01 to 0.03 percent of C, 0.5 to 1 percent of Si, 0.2 to 2.0 percent of Mn, 11.0 to 17.0 percent of Cr, 5.0 to 8.0 percent of Ni, 0.5 to 3.5 percent of Mo, less than or equal to 0.015 percent of P, less than or equal to 0.035 percent of S, 0.02 to 0.08 percent of N, 0.02 to 0.5 percent of Nb, less than 0.1 percent of W, and the balance of Fe and inevitable impurities. The preparation method for the high strength super-martensitic stainless steel comprises process steps of: smelting; casting; forging or rolling; quenching; tempering and the like. The steel can be used as a material for deep well and ultra deep well oil and gas pipelines and a material for crude oil and gas conveying equipment.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to super martensitic stainless steel. Background technique [0002] Oil and natural gas are national strategic resources. Especially with the acceleration of my country's industrialization process and the improvement of people's living standards, the corresponding demand for energy has also increased sharply. Energy shortage has become one of the main factors restricting the country's economic development. In order to alleviate the increasingly serious contradiction between oil and gas supply and demand in my country and to further expand oil and natural gas mining areas, my country has shifted the key oil and natural gas mining areas from the central and eastern regions to the west and ocean areas. However, the oil and gas production conditions in this type of area are quite different from those in the past. For example, most of the wells in Xinjiang are deep and ultra-deep wells (th...

Claims

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Application Information

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IPC IPC(8): C22C38/48C22C38/58C21D8/10
Inventor 邹德宁陈治毓韩英王铎乔圆圆王鸿波
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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