Material Specification/Equivalency

[Zkrasowski]

I recently came across a drawing specifying
J-20 Steel or equivalent. Does anyone have any
information on this type of steel? My research
has currently turned up very little, other then
I believe that it is a type of tool steel but beyond
that I am not having much luck.

 

[sbozy25]

It's a Japanese material specification. I don't have the books available at the moment, but if you find the specification books you can find what kind of material it is.

 

[JCJackson]

I have the BSC Iron & Stell spec's and all the Japanese (JIS) spec's start with a capitalised 'S' followed by further capitalised letters and/or numbers. There is a J55 under the API spec's. Hope that helps,

 

[Pud]

It may be the equivalent of P20 - used in the UK for non-through hardened plastic injection moulding tooling?

Spec here:

http://www.westyorkssteel.com/Product_Info/Tool_Steel/p20.htm

Cheers

Harry

 

[dimjim]

I wonder if this is a Jominy number indicating the
hardness of the material rather than a steel number.