SM490 Plate material properties? (Japanese material Requirement) 1

Is the ASTM equivalent ASTM A242?

I took a look at this using Google. This will not be as easy as it looks. After a quick review of several papers;

Here is the reported chemical composition ranges, which depend on product form and thickness;

SM 490A,B, C, YA, YB (not sure if these are strength grades)

Carbon content range 0.18% max, and for thicker grades 0.22% max
Mn 1.60% max
Si 0.55% max

P 0.035% max
S 0.035% max

Note; other alloy elements may be added as necessary (Ni, Cr and Cu)

The reported strength levels in one of the technical papers depended on product form;

Yield Strength 3500-4030 kgf/cm²

Ultimate Tensile Strength 5400-5720 kgf/cm²


I would suggest you get your hands on JIS G3106-1992 or newer edition, Rolled Steel for Welded Structure for additional information on this material.

Shockdesigner331;
You are in luck today. After I posted the above, I decided to check one other source on steel plates in my database.

My steel plate source book from JFE indicates the SM 490 (490 N/ mm² class of steel plate and SM490Y are equivalent to the following ASTM Standards;

SM490 ASTM A 572
SM490Y ASTM A 573

The tensile information above and the JIS G3106 still should be reviewed.

Thanks Metengr!