Nippon Steel & Sumikin Stainless Steel Corporation

Kazuhiro Suetsugu

Hiroshige Inoue

Shinji Tsuge

Yuusuke Oikawa

Shigeo Fukumoto

Ryo Matsuhashi

Yutaka Tadokoro

Toshinori Ohtsubo

An austenitic stainless steel hot-rolled steel material can be provided which has sea-water resistance and strength superior to conventional steel. Low-temperature toughness can be maintained, which is preferable in a structural member of speedy craft. The steel material can include an austenitic stainless steel hot-rolled steel material which excels in the properties of corrosion resistance, proof stress, and low-temperature toughness. In such austenitic stainless steel hot-rolling steel material, e.g., PI [=Cr+3.3(Mo+0.5W)+16N] ranges from 35 to 40, &#x3b4; cal [=2.9 (Cr+0.3Si+Mo+0.5W)&#x2212;2.6 (Ni+0.3Mn+0.25Cu+35C+20N)&#x2212;18] ranges from &#x2212;6 to +2, and a 0.2% proof stress at room temperature is not less than 550 MPa, Charpy impact value measured using a V-notch test piece at &#x2212;40&#xb0; C. is not less than 100 J/cm2, and the pitting potential measured in a deaerated aqueous solution of 10% NaCl at 50&#xb0; C. (Vc'100) is not less than 500 mV (as it relates to saturated Ag/AgCl).

Austenite-type stainless steel hot-rolling steel material with excellent corrosion resistance, proof-stress, and low-temperature toughness and production method thereof

An austenitic stainless steel hot-rolled steel material can be provided which has sea-water resistance and strength superior to conventional steel. Low-temperature toughness can be maintained, which is preferable in a structural member of speedy craft. The steel material can include an austenitic stainless steel hot-rolled steel material which excels in the properties of corrosion resistance, proof stress, and low-temperature toughness. In such austenitic stainless steel hot-rolling steel material, e.g., PI [=Cr+3.3(Mo+0.5W)+16N] ranges from 35 to 40, &#x3b4; cal [=2.9(Cr+0.3Si+Mo+0.5W)&#x2212;2.6(Ni+0.3Mn+0.25Cu+35C+20N)&#x2212;18] ranges from &#x2212;6 to +2, and a 0.2% proof stress at room temperature is not less than 550 MPa, Charpy impact value measured using a V-notch test piece at &#x2212;40&#xb0; C. is not less than 100 J/cm2, and the pitting potential measured in a deaerated aqueous solution of 10% NaCl at 50&#xb0; C. (Vc'100) is not less than 500 mV (as it relates to saturated Ag/AgCl).

Austenitic stainless hot-rolled steel material with excellent corrosion resistance, proof stress, and low-temperature toughness

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Tokyo, Japan

Kazuhiro Suetsugu