316L as 316??

[Spoonful]

Hi All,

If I am correct, only difference between 316 and 316L is the carbon content, as specified in ASTM A182 F316 has carbon max of 0.08% and ASTM A182 F316 has carbon max of 0.030% all others the same.

The question is, as all carbon content is specified as max value, so all 316L material will automatically meet the requirement of 316. Dose that mean ASTM A182 F316L is automatically also ASTM A182 F316?


Regards

Spoonful

 

[dik]

Generally, the yield for 316L is slightly lower, I think...

Dik

 

[gr2vessels]

These days, it is typical arrangement the 'dual' certification for the 316/316L material, mainly for economical reasons, keeping the stocks lower. This way, they can provide material with specific weldability properties and also materials exclusively for corrosion protection.

 

[Spoonful]

The case I have is the client want to have all 316/316L dual certified material, now I have a material its material cert only stating 316L, and I need to know that if I could use it.

 

[gr2vessels]

Yes, you can use the 316L to cover the dual certification. It won't work the other way around (316 will not cover 316L).
Cheers,
gr2vessels

 

[Spoonful]

Thanks gr2vessels,

I also checked against ASTM A182 for chemical, tensile, yield and elongation, heat treatment requirement. 316L have slight lower tensile, but on actual material cert the tensile are higher than what required for 316. I wounder why didn't the manufacture dual certify it.

Cheers
Spoonful

 

[Engdoitbetter]

Dear Spoonful,

My Company works a lot with austenitic steel, so I can assure you that dual certification is very common nowadays. SS316L has a reduced carbon content and lower minimum strength compared to SS316, BUT now you can easily find SS316L with correct chemical properties AND mechanical characteristics better than SS316, thus the dual certification.

As to why the manufacturer didn't certify it, I don't know. What I do know is that many times engineering companies ask for SS 316 and SS 316L as if they were two different materials (which is theoretically true, but practically irrelevant).

Hope it helps.

Stefano