A heat treatment process for x70-grade pipeline steel bends

A process method and pipeline steel technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of immature manufacturing process and performance of X70 grade pipeline steel bend pipes, uneven microstructure of X70 grade pipeline steel bend pipes, and High failure rate and other problems, to achieve the effect of reducing safety hazards, improving mechanical properties, good stability and repeatability

Inactive Publication Date: 2016-06-15
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, among the used pipeline steel bends, the failure rate of the bends related to X70 grade pipeline steel is relatively high, and the manufacturing process and performance of X70 grade pipeline steel bends are still immature
[0004] At present, the main defects of the heat treatment technology of X70 grade pipeline steel elbows are: quenching heating usually adopts one-time heating to the quenching temperature, X70 grade pipeline steel elbows have uneven structure and large thermal stress; and the cooling method is oil cooling, and the project cost High, environmental pollution, and there are certain safety hazards, which requires further improvement of the heat treatment process of X70 grade pipeline steel elbow to improve its strength and toughness, and ensure the safety, reliability and economy of the project

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Selection of the composition of X70 pipeline steel elbows: Choose a X70 pipeline steel elbow based on low carbon-manganese-molybdenum series and add other alloying elements in an appropriate amount. The specific composition is that the mass fraction of carbon is 0.05%. The mass fraction of silicon is 0.19%, the mass fraction of manganese is 1.54%, the mass fraction of phosphorus is 0.009%, the mass fraction of sulfur is 0.001%, the mass fraction of copper is 0.23%, the mass fraction of nickel is 0.2%, and the mass fraction of niobium is The mass fraction is 0.07%, the mass fraction of vanadium is 0.03%, the mass fraction of chromium is 0.2%, the mass fraction of titanium is 0.02%, the mass fraction of calcium is 0.0014%, the mass fraction of aluminum is 0.03%, and the mass fraction of molybdenum is 0.03%. The mass fraction of boron is 0.19%, the mass fraction of boron is 0.0001%, the mass fraction of oxygen is 0.0028%, the mass fraction of hydrogen is 0.0004%, and the ...

Embodiment 2

[0020] 1. Selection of the composition of X70 pipeline steel elbows: Choose a X70 pipeline steel elbow based on low carbon-manganese-molybdenum series and add other alloying elements in an appropriate amount. The specific composition is that the mass fraction of carbon is 0.05%. The mass fraction of silicon is 0.19%, the mass fraction of manganese is 1.54%, the mass fraction of phosphorus is 0.009%, the mass fraction of sulfur is 0.001%, the mass fraction of copper is 0.23%, the mass fraction of nickel is 0.2%, and the mass fraction of niobium is The mass fraction is 0.07%, the mass fraction of vanadium is 0.03%, the mass fraction of chromium is 0.2%, the mass fraction of titanium is 0.02%, the mass fraction of calcium is 0.0014%, the mass fraction of aluminum is 0.03%, and the mass fraction of molybdenum is 0.03%. The mass fraction of boron is 0.19%, the mass fraction of boron is 0.0001%, the mass fraction of oxygen is 0.0028%, the mass fraction of hydrogen is 0.0004%, and the ...

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PUM

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Abstract

A heat treatment process for an X70 grade pipeline steel bend pipe. The method comprises the following steps: 1, selecting components of the X70 grade pipeline steel bend pipe; 2, determining a heat treatment process; 3, quenching; 4, tempering; and 5, acquiring the X70 grade pipeline steel bend pipe with excellent mechanical properties in accordance with the heat treatment process provided by the invention. The X70 grade pipeline steel bend pipe has excellent mechanical properties, such as high hardness (no less than HB210), high yield strength (no less than 590 MPa), high tensile strength (no less than 705 MPa), low yield ratio (no more than 0.84), good extensibility (no less than 23%) and high impact absorbing energy (no less than 280J).

Description

Technical field [0001] The invention relates to a heat treatment process method for X70 pipeline steel elbows. Background technique [0002] Petroleum and natural gas transmission pipelines in my country usually require high-grade, large-diameter and high-pressure pipeline steel, and the construction of long-distance pipelines inevitably requires a large number of bends that match the mechanical properties of the main pipeline. The bend is one of the structural parts with the most severe service conditions in the long-distance pipeline, and the proportion of failure accidents in the entire pipeline accident is also the highest. With the increase in the distance between domestic and foreign transportation pipelines, the increase of steel pipe wall thickness and the increase of pipeline pressure, X60 and X65 pipeline steel elbows can no longer meet the requirements of its mechanical properties. [0003] The West-East Gas Pipeline Project selected X70 pipeline steel for the first tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/08C21D1/18C22C38/58
CPCC21D1/18C21D9/08C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16
Inventor 赵时璐张钧王建明张震王双红张正贵
Owner SHENYANG UNIV
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