Nippon Steel Corporation

Takashi Kusunoki

Satoshi Nishimura

Shunji Sakamoto

Akira Usami

Motohiro Okushima

Hiroshi Kihira

Yoshiyuki Harada

Kazumi Matsuoka

Hiroshi Takezawa

Norihito Fujikawa

Hiromichi Yasunami

Yasumori Fujii

The present invention provides a low alloy steel and a weld joint thereof excellent in hydrochloric acid corrosion resistance and sulfuric acid corrosion resistance, said low alloy steel containing, in mass, Here, said AI is given by the following expression,/10,000=0.0005+0.045&#xd7;Sb %&#x2212;C %&#xd7;Mo %,where % means mass %.

Low alloy steel and weld joint thereof excellent in corrosion resistance to hydrochloric acid and sulfuric acid

A predicted corrosion amount of a painted or unpainted atmospheric corrosion resistant steel is calculated by using extrinsic corrosion information including weather observation data, an amount of airborne salt, and an amount of sulfur oxide in a planned location for use where the atmospheric corrosion resistant steel is to be used, and intrinsic corrosion information on components of the atmospheric corrosion resistant steel. The weather observation data on this occasion preferably includes the annual wetness time, annual mean wind speed, and annual mean temperature. Moreover, it is preferable to calculate a corrosivity index, estimate a first-year corrosion amount of the atmospheric corrosion resistant steel and a rust stabilization index from the corrosivity index, and calculate a corrosion amount accumulated over time.

Method for predicting degree of corrosion of weather-resistant steel

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Tokyo, Japan

Takashi Kusunoki