Description: AFM ER320LR weld metal deposits have the same basic composition as that
deposited by AFM ER320; however, the elements of C, Si, P, and S are specified
at lower maximum levels, and Cb (Nb) and Mn are controlled within narrower
ranges. These changes reduce the weld metal fissuring (while maintaining the
corrosion resistance) frequently encountered in fully austenitic stainless steel
weld metals. Consequently, welding practices typically used for austenitic
stainless steel weld metals containing ferrite can be used in bare filler metal
welding processes such as gas tungsten arc and gas metal arc. AFM ER320LR has
been used successfully in submerged arc overlay welding, but it may be prone to
cracking when used for joining base metal by the submerged arc process. AFM
ER320LR has a lower minimum tensile strength than AFM ER320.
Chemical Composition Requirements for Undiluted Weld Metal: |
(C) |
Carbon |
0.025 |
| (Cb + Nb)) |
Columbium & Niobium |
8XC, min plus Ta to 0.40 max |
| (Cr) |
Chromium |
19.0 to 21.0 |
| (Cu) |
Copper |
3.0 to 4.0 |
| (Mn) |
Manganese |
1.5 to 2.0 |
| (Mo) |
Molybtenum |
2.0 to 3.0 |
| (Ni) |
Nickel |
32.0 to 36.0 |
(P) |
Phosphorus |
0.015 |
(S) |
Sulfer |
0.02 |
| (Si) |
Silicon |
0.15 |
All values are considered maximum, unless other-wise noted.
|
