Other

Kobe Steel, Ltd.

Shigeo Okano

Hitoshi Asahi

Hideaki Fukai

Takahiro Kushida

Toshiaki Kan

Yasuyoshi Yamane

Satoru Takeshita

Masahiko Sakai

A steel plate for paint use which contains C (0.12% or less), Si (1.0% or less), Mn (2.5% or less), P (0.05% or less), S (0.02% or less), and Cr (0.05% or less), Cu (0.05&#x2013;3.0%), Ni (0.05&#x2013;6.0%), Ti (0.025&#x2013;0.15%), and Cu+Ni (0.50% or more), with Pbeing 0.23% or less, in terms of mass %. Said steel plate may contain at least one additional component selected from B (0.0005&#x2013;0.0030%), Al (0.05&#x2013;0.50%), Ca (0.0001&#x2013;0.05%), Ce (0.0001&#x2013;0.05%), La (0.0001&#x2013;0.05%), Nb (0.002&#x2013;0.05%), V (0.01&#x2013;0.10%), Zr (0.002&#x2013;0.05%), and Mo (0.05&#x2013;0.5%), in terms of mass %. This steel plate provides good weldability as well as good painting durability in a salt-polluted environment.

Steel plate for paint use and manufacturing method thereof

A steel pipe is provided which is excellent in resistance to outer surface stress corrosion cracking (SCC) when used for a pipeline without impairing the fundamental requirement for the steel as a pipeline. The steel pipe has a surface adjusted to have a mean line roughness Ra of up to 7 &mgr;m and a maximum height Rmax of up to 50 &mgr;m. The surface is adjusted by sand blasting to have this roughness.

Steel having excellent outer surface SCC resistance for pipeline

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Kakogawa, Japan

Shigeo Okano