ER308/308L is used for welding types 304, 304L, 308, and 308L stainless steels. It is very
 
similar to type 308, but has a carbon content held to a max of .03% to avoid carbide precipitation. This product can also be used for welding types 321 and 347 stainless steels. This wire is suitable for applications at cryogenic temperatures.
AWS Specification
AWS A5.9/A5.9M:2006
AWS Classification
ER308
ER308L
 
ER309/309L  is very similar to type 309 except for the carbon content being lower than .03%. The extra low carbon content provides good resistance to carbide precipitation and intergranular corrosion. ER309L works well for dissimilar joints that undergo heat treatment.
AWS Specification
AWS A5.9/A5.9M:2006
AWS Classification
ER309
ER309
 
ER316/316L  is used for welding types 316 and 316L stainless steels. It has a maximum carbon content of .03% to reduce the possibility of formation of intergranular carbide precipitation. This low carbon alloy is not as strong as 316H at elevated temperatures. This filler metal is primarilyused for welding low carbon molybdenum bearing austenitic alloys.
AWS Specification
AWS A5.9/A5.9M:2006
AWS Classification
ER316
ER316L
 
Crown ER 630 (17-4 PH)
is used primarily in the aerospace and other high-technology industries. The nominal composition (wt
.%) of this classification is 16.4 Cr, 4.7 Ni, 3.6 Cu. The composition is designed primarily for welding ASTM
A 564 Type 630 and some other precipitation- hardening stainless steels such as 15-5. The composition is modified to prevent the formation of ferrite networks in the martensitic microstructure which have a deleterious effect on mechanical properties. Weld deposits provide excellent mechanical properties with high strength, hardness, corrosion resistance and moderate wear resistance. Dependent on the application and weld size, the weld metal may be used as-welded; welded and precipitation hardened; or welded, solution treated, and precipitation hardened.
Specifications
AWS
A5.9/A5.9M
ER 630 (17
-4 PH)