ASTM A420/A420M-00
Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low Temperature Service
| Grade |
Composition, % |
| |
C |
Mn |
P |
S |
Si |
Ni |
Cu |
Cr |
Mo |
V |
Nb |
| WPL6(1)(2) |
0.30 |
0.60-1.35 |
0.035 |
0.040 |
0.15-0.30 |
0.40 |
0.40 |
0.30 |
0.12 |
0.08 |
0.02 |
| WPL9 |
0.20 |
0.40-1.06 |
0.030 |
0.030 |
- |
1.60-2.24 |
0.75-1.25 |
- |
- |
- |
- |
GENERAL NOTE:
All values are maximum unless otherwise indicated.
NOTES: (1) For each reduction of 0.01% C below 0.30%, an increase of 0.05% Mn above 1.06% will be permitted, up to a maximum of 1.35%. (2) Fittings made from forgings may have 1.35% max Mn.
| Tensile Requirements |
WPL6 |
WPL9 |
| Tensile Strength, min, ksi [MPa] |
60-85[415-585] |
63-88[435-610] |
| Yield Strength, min, ksi [MPa] |
35[240] |
46[315] |
|
Wall thickness |
Elongation Requirements |
| in |
mm |
Longitudinal |
Transverse |
| WPL6 |
WPL9 |
WPL6 |
WPL9 |
| Standard round specimen, or small proportional specimen, min % in 4D |
|
|
22 |
20 |
12 |
- |
| Rectangular Specimen for wall thickness 0.312in [7.94mm] and over, and for all small sizes tested in full section; min % in 2in[50mm] |
³0.312 |
³7.94 |
30 |
28 |
16.5 |
18 |
| Rectangular Specimen for wall thickness less than 0.312in [7.94mm]; min % in 2 in[50mm] (0.5in [12.7mm] wide specimen) |
0.281 |
7.14 |
28.5 |
26.5 |
15.5 |
17.0 |
| 0.250 |
6.35 |
27.0 |
25.0 |
14.5 |
16.0 |
| 0.219 |
5.56 |
25.5 |
23.5 |
- |
- |
| 0.188 |
4.76 |
24.0 |
22.0 |
- |
- |
| 0.156 |
3.97 |
22.5 |
20.5 |
- |
- |
| 0.125 |
3.17 |
21.0 |
19.0 |
- |
- |
| 0.094 |
2.38 |
19.5 |
17.5 |
- |
- |
| 0.062 |
1.59 |
18.0 |
16.0 |
- |
- |
Where the wall thickness lies between two values above, the min elongation value is determined by the following equations:
WPL6 WPL9
Longitudinal E=48t+15.00 E=48t+13.00
Transverse E=32t+6.50 E=32t+8.00
E = elongation in 2in [50mm], %
t = actual thickness of specimen, in [mm] |
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