Nippon Steel & Sumikin Stainless Steel Corporation

Nippon Steel & Sumkin Stainless Steel Corporation

Nippon Steel Stainless Steel Corporation

Atsuhisa Yakawa

Junichi Hamada

Yoshiharu Inoue

Shuji Yamamoto

Shinichi Teraoka

Nobuhiko Hiraide

Chikako Takushima

Mitsuhiro Fujinaga

The present invention particularly has as its technical problem to provide austenitic stainless steel sheet used as the material for housings of turbochargers in which excellent heat resistance and workability are demanded. The austenitic stainless steel sheet according to the present invention comprises, by mass %, C: 0.005 to 0.2%, Si: 0.1 to 4%, Mn: 0.1 to 10%, Ni: 2 to 25%, Cr: 15 to 30%, N: 0.01 to less than 0.4%, Al: 0.001 to 1%, Cu: 0.05 to 4%, Mo: 0.02 to 3%, V: 0.02 to 1%, P: 0.05% or less, and S: 0.01% or less, comprises a balance of Fe and unavoidable impurities, and has an annealing twin frequency of 40% or more and is excellent in heat resistance.

Austenitic stainless steel sheet for exhaust component having excellent heat resistance and workability, turbocharger component, and method for producing austenitic stainless steel sheet for exhaust component

A method of increasing the thickness of a tube which increases a thickness of an end part of a tube without a burr being formed, comprising placing a tubebetween a dieand mandrelin the state with a space for increasing the thickness between a small diameter partof the mandreland a first end partof a tubeand between a large diameter hole partC of the dieand a second end partof the tube, using a first upsetting punchand a second upsetting punchto respectively process the first end partand the second end partof the tube, pulling out the mandrelfrom the tubein the state with the second upsetting punchconstraining the second end partof the tube, and using the first upsetting punchto push up the first end partof the tubeto take out the tubefrom the die

Method of increasing thickness of tube and increased thickness tube

This heat-resistant austenitic stainless steel sheet contains, in mass %, C: 0.05 to 0.15%, Si: 1.0 to 3.5%, Mn: 0.5 to 2.0%, P: not more than 0.04%, S: not more than 0.01%, Cr: 23.0 to 26.0%, Ni: 10.0 to 15.0%, Mo: 0.50 to 1.20%, Ti: not more than 0.1%, Al: 0.01 to 0.10% and N: 0.10 to 0.30%, wherein the total amount of C and N (C+N) is from 0.25 to 0.35%, and the balance is composed of Fe and unavoidable impurities. The heat-resistant austenitic stainless steel can be used in a high-temperature environment that reaches a maximum temperature of 1,100&#xb0; C.

Heat-resistant austenitic stainless steel sheet

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Tokyo, Japan

Atsuhisa Yakawa