316 SS VS. 316L SS 4

[NBROWN]

MY SPECIFICATION CALLS FOR CF-8M(316SS) WITH TS OF 75,000 YS 30,000 ENLOGATION OF 40%.
WE ARE CHANGING TO BAR STOCK DUE TO COST AND QUANTIY NEEDED SUPPLIER CERTS ARE CALLING OUT 316/316L WITH MECHANICAL PROPERTIES RUNNNING WITH IN THE GUIDELINES. IS THEIR ANY HIDDEN ISSUES WITH 316 VERSES 316L OR THE "DUAL CERTIFIED" 316/316L MATERIAL? THE CORROSION FACTOR ISN'T AN ISSUE WITH THE APPLICATION.
WHAT WILL THE LESS CARBON OF 316L BRING TO THE TABLE?

 

[unclesyd]

Less Carbon in the 316L usually relates to lower allowable values in the strength levels. But the dual certified material should come with an MTR with the actual values of both tensile and yield.
Several innovations in the production of S/S has allowed the producers to Dual Certify S/S.

You should have not problem if corrosion is of no concern.

Just make sure you check the material against the MTR for the strength levels.

 

[gvanbeek]

The L grades of stainless steel have increased resistance to sensitization in the heat affected zone of the welds. Therefore it is important if the part is to be welded.

 

[marshell]

The low carbon steel not only helps with the HAZ, but it also improves machinability of the part.

Other advantages of the dual spec is that vendor stocks the dual spec'd material and ships the same stuff if a customer specified 316 or 316l.

Since there is an overlap in the specifications that the steel producer aims for to meet both specs, he has in effect had to control the process better, and the material you recive that is dual specd' will be more consistent from lot to lot.

 

[NBROWN]

SO I POSE THIS QUESTION COMING FROM CAST MATERIAL TO BAR MATERIAL. SHOULD THE CHEMICAL COMPOSITION CHANGE DRAMATICALLY TO MAINTAIN THE MECHANICAL PROPERTIES?
TS OF 75,000 YS 30,000 ENLOGATION OF 40%

GVANBEEK - THIS MATERIAL IS NOT IN A WELD APPLICATION SO THAT'S NOT AN ISSUE. THANKS TO ALL

 

[arunmrao]

Changing from CF8M to 316/316L will not effect any change in chemical composition. You can get the same mechanical properties.The chemistry is selected with a view to get the best corrosion properties, mechanical properties are only incidental.

What is the purpose of selecting a stainless steel material when you mention corrosion factor is not an issue? Also you say it is not a weld structure, the end use is really puzzling to me. Please clarify.