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Austenitic stainless steel

An austenitic and stainless steel technology, applied in lighting, heating equipment, heat exchange equipment, etc., can solve the problems of poor toughness and ductility

Inactive Publication Date: 2008-03-26
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a large amount of Si promotes the precipitation of σ phase, resulting in poor toughness and ductility

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0070] The steel with the chemical composition shown in Table 1 was smelted in a high-frequency vacuum melting furnace to produce a 30 kg steel ingot with an outer diameter of 120 mm. The steels of Nos. 1 to 19 in the table are steels of the present invention, and A to F are comparative steels.

[0071] The obtained steel ingot was hot-forged to form a plate with a thickness of 40 mm, and a round bar tensile specimen (diameter 10 mm, length 130 mm) for evaluating high-temperature ductility was produced by machining. In addition, a sheet material with a thickness of 15 mm was prepared by hot forging, and after softening heat treatment, the sheet material was cold-rolled to a thickness of 10 mm, kept at 1150° C. for 15 minutes, and then water-cooled.

[0072] The above plates were fabricated into creep specimens and adjustable restraint crack (varestrain) specimens by machining. The shape of the creep sample is a round bar sample with a diameter of 6 mm and a distance between m...

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Abstract

An austenitic stainless steel improved in creep strength, creep ductility, weldability and also hot workability. The steel, consisting of, by mass %, C: 0.05-0.15 %, Si: not more than 2 %, Mn: 0.1-3%, P: 0.05-0.30 %, S: not more than 0.03 %, Cr: 15-28 %, Ni: 8-55 %, Cu: 0-3.0 %, Ti: 0.05-0.6 %, REM: 0.001-0.5 %, sol. Al: 0.001-0.1%, N: not more than 0.03 %, and the balance being Fe and incidental impurities. This steel may contain one or more of Mo, W, B, Nb, V, Co, Zr, Hf, Ta, Mg and Ca. It is preferable that REM is Nd.

Description

technical field [0001] The present invention relates to an austenitic stainless steel excellent in high-temperature strength for steel plates, bar steel, forged steel products, and the like used as pipes or heat-resistant and pressure-resistant members in power generation boilers, chemical industry equipment, and the like. Background technique [0002] Conventionally, austenitic stainless steels such as JIS SUS304H, SUS316H, SUS321H, SUS347H, and SUS310S have been used as equipment materials for boilers and chemical equipment used in high-temperature environments. However, in recent years, the operating conditions of devices in such a high-temperature environment have become significantly severe, and the performance requirements for materials used have gradually become stricter. Austenitic stainless steels used in the past have significantly insufficient high-temperature strength. [0003] Precipitating carbides is effective for improving the high temperature strength of aus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00
CPCC22C38/14C22C38/005C21D7/13C21D2211/004C22C38/04C21D2211/001C21D6/004C22C38/06C22C38/02C22C38/50C22C38/08F28F21/083C22C38/001C22C38/18C22C38/002
Inventor 冈田浩一五十岚正晃小川和博野口泰隆
Owner NIPPON STEEL CORP
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