MATERIAL GRADE IDENTIFICATION. 2

[skengg]

Hello,
can anybody help to identify material grade just by material composition. i tried a lot but still couldn't be able to find exact grade.
carbon - 0.32% , silicone - 1.1% , manganese - 1.7% , chromium - 12.7%, molybdenum - 0.04%, Phosphorous - 0.02% , sulphur - 0.008%, nickel - less than 2%.
i checked major SS Grade but not matched with them.
i posted in this forum because this material used for ball manufacturing in ball valve.

 

[Danlap]

Hello,
coming from mechanical background (not really good with material), I see the tendency that naming material designation e.g. 18Cr-8Ni (instead of ASTM A240-304) can pinpoint or at least scrutinize some options based on Chromium range. For example, 18Cr it is somewhere between 16to18% or 18to20%.
In my company we use material designation, ASTM, CEN, DIN, ISO and GB (china).

On your case, my guess would be 13Cr steel, which presumably in ASTM is A240 Type 410S or SS grade 410. Some of other chemical components are a bit off though.
But maybe I am also wrong.
a website that I found below

https://www.mstube.co.jp/english/products/pdf/014_st_applicable.pdf

Btw, you should have material traceability of that material origin.

Hope that helps.

Regards,
D

 

[CptMaaB]

Please keep in mind that some balls are cladded, or spray coated with a superior material, to give a durability advantage.
Unfortunately, you have given very little information about the valve, so I cannot estimate if it is such a ball.

 

[skengg]

thanx Danlap for the pdf link.
CptMaaB this isn't about which valve it is, it is about identifying material grade through material composition.