Method for manufacturing austenite series heat-resistant alloy pipe and austenite series heat-resistant alloy pipe manufactured by the method

A technology for heat-resistant alloys and manufacturing methods, applied in the field of austenitic heat-resistant alloy pipes, capable of solving problems such as insufficient high-temperature strength of heat-resistant alloys

Active Publication Date: 2015-09-30
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the high-temperature strength of common austenitic heat-resistant alloys such as SUS304H...

Method used

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  • Method for manufacturing austenite series heat-resistant alloy pipe and austenite series heat-resistant alloy pipe manufactured by the method
  • Method for manufacturing austenite series heat-resistant alloy pipe and austenite series heat-resistant alloy pipe manufactured by the method

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Embodiment 1

[0143] Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited to these Examples.

[0144] Austenitic alloys 1 to 15 having the chemical compositions shown in Table 1 were melted in a high-frequency vacuum melting furnace to produce a 17 kg steel ingot with an outer diameter of 100 mm. It should be noted that the chemical compositions of alloys 1-7 and 13-15 in Table 1 are within the range specified in the present invention, and the chemical compositions of alloys 8-12 are outside the range specified in the present invention.

[0145] Table 1

[0146]

[0147] After heating the said steel ingot to 1180 degreeC, hot forging was performed so that the final temperature might become 1050 degreeC, and the hot forged plate material of thickness 15mm was produced. It should be noted that air cooling was performed after the hot forging was terminated. The hot-forged sheet material was subjected to a softening heat treatment at 1...

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Abstract

The invention provides a method for manufacturing an austenite series heat-resistant alloy pipe and an austenite series heat-resistant alloy pipe manufactured by the method, the austenite series heat-resistant alloy pipe is excellent in creep strength of hot working/cold working position after heat treatment. The method for manufacturing the austenite series heat-resistant alloy pipe comprises bending, expanding, hot working or cold working an alloy pipe after heat treatment to form a working portion, and after baking with the condition that the rate of coverage of carbonized matter in grain boundaries of the metallographic structure of the working portion and an intermetallic compound is below 50%, wherein the alloy pipe comprises chemical composition as following, by mass, 0.02 % to 0.13 % of C, less than 1 % of Si, less than 2 % of Mn, less than 0.03 % of P, less than 0.01 % of S, 25 % to 36 % of Cr, 40 % to 60 % of Ni, less than 0.3 % of Al, 2.0 % to 10.0 % of W, 0.05 % to 1.5 % of Ti, 0.002 % to 0.03 % of Zr, 0 % to 3 % of Mo, 0 % to 1.5 % of Nb, 0 % to 15 % of Co, 0 % to 0.05 % of Ca, 0 % to 0.05 % of Mg, 0 % to 0.2 % of rare earth element, 0 % to 0.2 % of Hf, 0 % to 0.2 % of B, 0 % to 1.5 % of V, 0 % to 2.0 % of Ta, 0 % to 3.0 % of Re, and the reminder comprising Fe and inevitable impurities.

Description

technical field [0001] The present invention relates to a manufacturing method of an austenitic heat-resistant alloy pipe and an austenitic heat-resistant alloy pipe manufactured by the manufacturing method. Specifically, the present invention relates to a method for producing an austenitic heat-resistant alloy pipe used as a pipe material in a boiler for power generation, equipment for chemical industry, and the like, and an austenitic heat-resistant alloy pipe produced by the production method. Background technique [0002] Today, coal-fired power generation occupies a very important position in the domestic power supply. Unlike oil and other energy sources, coal is produced on average in the world and its price is relatively stable, so it is expected to be widely used as a basic energy source in the world in the future. However, the CO per unit of electricity produced by coal-fired power 2 The amount of gas discharge is larger than that of other power generation systems...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C30/00
Inventor 石川茂浩西山佳孝仙波润之冈田浩一
Owner NIPPON STEEL CORP
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