Re-containing seamless Cr-Mo-V type alloy steel pipe and production method thereof

A technology of alloy steel pipe and production method, applied in the direction of pipe, rigid pipe, furnace type, etc., to achieve the effect of good economic benefit, excellent comprehensive performance and simple composition

Inactive Publication Date: 2013-07-24
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no patent similar to the system of the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The mass percent chemical composition of the material is: C 0.11; Si 0.28; Mn 0.62; Cr 1.03; Mo 0.28; V 0.21; impurities, the mass percentage is 100% in total, and Re is Ce element. The specification of the seamless pipe produced is Φ219×29 mm, and the heat treatment system is normalizing + tempering.

[0015] The tensile strength, yield strength, elongation after fracture, and impact energy of the steel pipe are 550MPa, 415MPa, 35.2%, and 99J respectively; the high temperature yield strength at 300, 400, 500, and 550°C is 375, 366, 305, and 270MPa, respectively. The grades of various inclusions in the steel are not greater than 1.0 grade, the grain size of the finished tube is 7.5 grade, and the microstructure is ferrite + pearlite + a small amount of granular bainite.

Embodiment 2

[0017] The mass percent chemical composition of the material is: C 0.09; Si 0.30; Mn 0.63; Cr 1.10; Mo 0.27; V 0.22; impurities, the mass percentage is 100% in total, and Re is Ce element. The specification of the seamless pipe produced is Φ219×29 mm, and the heat treatment system is normalizing + tempering.

[0018] The tensile strength, yield strength, elongation after fracture, and impact energy of the steel pipe are 540MPa, 420MPa, 31.8%, and 91J respectively; the high temperature yield strength at 300, 400, 500, and 550°C is 385, 375, 310, and 275MPa, respectively. The levels of various inclusions in the steel are not greater than 1.0, the grain size of the finished tube is 8.0, and the microstructure is ferrite + pearlite + a small amount of granular bainite.

Embodiment 3

[0020] The mass percent chemical composition of the material is: C 0.10; Si 0.33; Mn 0.59; Cr 1.08; Mo 0.28; V 0.24; impurities, the mass percentage is 100% in total, and Re is Ce element. The specification of the seamless pipe produced is Φ219×29 mm, and the heat treatment system is normalizing + tempering.

[0021]The tensile strength, yield strength, elongation after fracture, and impact energy of the steel pipe are 555MPa, 435MPa, 30.2%, and 102J respectively; the high temperature yield strength at 300, 400, 500, and 550°C is 390, 370, 325, and 290MPa, respectively. The grades of various inclusions in the steel are not greater than 1.5 grades, the grain size of the finished tube is 7.0 grades, and the microstructure is ferrite + pearlite + a small amount of granular bainite.

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Abstract

The invention relates to a Re-containing seamless Cr-Mo-V type alloy steel pipe and a production method thereof. The Re-containing seamless Cr-Mo-V type alloy steel pipe is characterized in that the material of the steel pipe comprises the following chemical components by weight percent: 0.08-0.15% of C, 0.19-0.36% of Si, 0.40-0.70% of Mn, 0.95-1.20% of Cr, 0.15-0.30% of V, 0.25-0.35% of Mo, 0.03-0.06% of Re, less than or equal to 0.015% of P, less than or equal to 0.005% of S, less than or equal to 0.015% of N, less than or equal to 0.003% of O and the balance of Fe and inevitable impurities. The process of normalization and tempering is adopted for the steel pipe having the wall thickness of less than 30 mm in thermal treatment in the production method; the heating temperature of normalization is in the range of 980-1020 DEG C, and heat preservation time is 2.0 min/mm, but not less than 30 minutes; the temperature of tempering is in the range of 730-750 DEG C and heat preservation time is not less than 1 hour; and then cooling is performed in static air. Quenching and tempering are adopted for the steel pipe with the wall thickness greater than or equal to 30 mm; the temperature of quenching is within the range of 950-990 DEG C, the temperature of tempering is in the range of 730-750 DEG C and heat preservation time is not less than 1 hour; and then cooling is performed in static air. The Re-containing seamless Cr-Mo-V type alloy steel pipe is simple in components, low in cost, high in production efficiency, good in economic benefit, and suitable for large-scale production, and has high popularization value.

Description

technical field [0001] The invention relates to a Re-containing seamless Cr-Mo-V alloy steel pipe and a production method thereof, belonging to the field of metallurgical materials. Background technique [0002] With the development of high-pressure boilers in the direction of high performance and long life, the boiler industry has put forward higher quality requirements for high-pressure boiler tubes. Good surface quality, high precision, stable structure and performance are necessary conditions for high-pressure boiler tubes to meet market needs. Heat-resistant steel is the key equipment for high-pressure boiler tubes in large-scale thermal power plants, and high-pressure tube billet steel is a special material for boiler equipment in power plants. Due to its harsh service conditions and strict technical requirements, it is required that the high-pressure tube billet steel not only has good process performance, but also has technical conditions such as high temperature re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C33/04C21D8/10C21D9/08F16L9/02
Inventor 王金龙刘金董珍郭智韬张行刚姜海龙
Owner INNER MONGOLIA BAOTOU STEEL UNION
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