Chemical Composition (%) of ASTM A420
Grade | C | Mn | P | S | Si |
WPL6(1)(2) | 0.3 | 0.60-1.35 | 0.035 | 0.04 | 0.15-0.30 |
WPL9 | 0.2 | 0.40-1.06 | 0.03 | 0.03 | - |
Grade | Ni | Cu | Cr | Mo | V | Nb |
WPL6(1)(2) | 0.4 | 0.4 | 0.3 | 0.12 | 0.08 | 0.02 |
WPL9 | 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.
Mechanical properties of ASTM A420
Tensile Requirements | WPL6 | WPL9 |
Tensile Strength | 60-85[415-585] | 63-88[435-610] |
Yield Strength | 35[240] | 46[315] |
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]
Impact Test Properties
Since these pipe fittings are primarily used for low-temperature service, the properties of charpy V-notch impact test must be considered.
Charpy Impact Requirements for WPL6, WPL9, and WPL3
Size of Specimen | A* | B* | ||
mm | ft·lbf | J | ft·lbf | J |
10 by 10.0 | 13 | 17.6 | 10 | 13.6 |
10 by 7.5 | 10 | 13.6 | 8 | 10.8 |
10 by 5.0 | 7 | 9.5 | 5 | 7.0 |
10 by 2.5 | 4 | 5.4 | 3 | 4.1 |
A*Charpy V-Notch Impact Value Required for Acceptance (Average of Three Specimens)
B*Minimum Charpy V-Notch Impact Value Without Requiring Retest (One Specimen Only of a Set)Charpy Impact Requirements for WPL8
Size of Specimen | A* | B* | ||
mm | ft·lbf | J | ft·lbf | J |
10 by 10.0 | 25.0 | 33.9 | 20.0 | 27.1 |
10 by 7.5 | 21.0 | 28.5 | 17.0 | 23.1 |
10 by 5.0 | 17.0 | 23.1 | 14.0 | 19.0 |
10 by 2.5 | 8.0 | 10.8 | 6.0 | 8.1 |
A*Charpy V-Notch Impact Value Required for Acceptance (Average of Three Specimens)
B*Minimum Charpy V-Notch Impact Value Without Requiring Retest (One Specimen Only of a Set)
Impact Test Temperature
Grade | °F [°C] |
WPL6 | −50 [−45] |
WPL9 | −100 [−75] |
WPL3 | −150 [−100] |
WPL8 | −320 [−195] |
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