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Steel designation system query

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Arjun Prajapati

Materials
Mar 27, 2021
2
What indicates P in the SS400P steel grade material ?
 
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What is the UNS number?
This is a proprietary designation.
In JIS this is a hot roll carbon steel, and in some places it is 304SS and on others a 400SS alloy.

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P.E. Metallurgy, consulting work welcomed
 
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