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316 vs 316L "double Certification"

September 15, 2010

I am trader of tubes and fittings, and and usually I sell 316SS products. During the last 2 years I noticed an increasing request of 316L SS and at the same time most of products have a DOUBLE CERTIFICATION 316/316L SS.
How is possible that a single piece nipple is both 316 and 316L?
I'm very confused.

Max Vessi
Buyer - Rome, Italy

September 17, 2010

Hi, Max

The difference between the two materials is that 316L must comply with a limited carbon proviso. As long as the material complies with the requirements of 316L, apparently it also complies with the requirements for type 316. 316L is more difficult and consequently more expensive to make, but it seems the difference has become small enough that some vendors simplify by having all their 316 also comply with 316L.


Ted Mooney,
Ted Mooney, P.E.
Striving to live Aloha - Pine Beach, New Jersey

October 22, 2010
Dear Max,
Simply 316 & 316L Differentiate by Carbon Percentage, But there is no minimum limit i.e. 316 Contain minimum 0 % Carbon and maximum 0.08% Carbon but 316L contain minimum 0% carbon and maximum 0.03% carbon by 316L fulfill all specification of 316 But 316 is not.

Umashankar Gupta
- Nagpur

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