Chemical Composition for Backing Rings

ASTM A109 Carbon Steel
Grade C Mn Ph S
T1,T2,T3 0.25 0.60 0.035 0.20
T4, T5 0.15 0.60 0.035 0.20
all listed elements are maximum unless specified
ASTM A-414 / ASME SA-414 Carbon Steel
Grade C Mn Ph S
A 0.150 0.900 0.035 0.040
B 0.220 0.900 0.035 0.040
C 0.250 0.900 0.035 0.040
D 0.250 1.200 0.035 0.040
E 0.270 1.200 0.035 0.040
F 0.310 1.200 0.035 0.040
G 0.310 1.200 0.035 0.040
all listed elements are maximum unless specified
ASME SA-182/ASTM A-182 Alloy Steel
Grade C Mn Ph S Si Cr Mo
F-11 0.10-
0.20
0.30-
0.80
0.04 0.04 0.50-
1.00
1.00-
1.60
0.44-
0.65
F-22 0.15 0.30-
0.60
0.04 0.04 0.50 2.00-
2.50
0.87-
1.13
all listed elements are maximum unless specified
ASME SA-240/ASTM A240 Stainless Steel
Grade C Mn Ph S Si Cr Ni Other
304 0.080 2.000 0.045 0.030 0.750 18.00-
20.00
8.00-
12.00
N 0.10 Max.
304L .030 2.000 0.045 0.030 0.750 18.00-
20.00
8.00-
12.00
N 0.10 Max.
316 0.080 2.000 0.045 0.030 0.750 16.00-
18.00
10.00-
14.00
Mo 2.00-
3.00
N 0.010 Max.
316L 0.030 2.000 0.045 0.030 0.750 16.00-
18.00
10.00-
14.00
Mo 2.00-
3.00
N 0.10 Max.
321 0.08 2.00 0.045 0.030 0.75 17.00-
19.00
9.00-
12.00
Ti 5 x (C+N) min, 0.70 Max. N 0.10 Max.
347 0.08 2.00 0.045 0.030 0.75 17.00-
19.00
9.00-
13.00
Cb + Ta 10 x C min; 1.00 Max.
all listed elements are maximum unless specified
ASTM B-221 / ASME SB-221
Grade Si Fe Cu Mn Mg Cr Zn Ti Other Elements Al
3003 0.60 0.70 0.05-
0.20
1.00-
1.50
0.10 Each 0.05
Total 0.15
Rem.
5086 0.40 0.50 0.10 0.20-
0.70
3.5-
4.5
0.05-
0.25
0.25 0.15 Each 0.05
Total 0.15
Rem.
6061 0.40-
0.80
0.7 0.15-
0.40
0.15 0.8-
1.2
0.04-
0.35
0.25 0.15 Each 0.05
Total 0.15
Rem.
all listed elements are maximum unless specified
MIL-I-15726(F)
Grade Cu Ni Zn Fe Lb Mn Ph S C
CDA-706 86.50 Min. 9.00-
11.00
0.50 1.00-
1.80
0.02 1.00 0.02 0.02 0.05
CDA-715 65.00 Min. 29.00-
33.00
0.50 0.40-
1.00
0.02 1.00 0.02 0.02 0.05
all listed elements are maximum unless specified

This page is for reference only, see the applicable specification for more details