Hello.. Is anyone help me to under

[Amit Pokhariyal]

Hello..
Is anyone help me to understand coding of Automotive Japnese steel codes?
What material stand for JAC270DU-3-Z-45/45 and JSH590BN-P?

 

[MintJulep]

These may be quasi-codified proprietary steels specific to a manufacturer. The JAC product seems to be for Honda.

You might find some insight in the following papers:

https://www.jfe-steel.co.jp/research/giho/041/pdf/041-05.pdf

https://www.jfe-steel.co.jp/research/giho/030/pdf/030-03-2.pdf