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Home > Seamless Steel Pipe Introduction > Material > Carbon & Alloy Steel > ASTM A403 WP 304, 304L 316, 316L
ASTM A234/A234M WPB/WPC/WP11 ASTM A420/A420M WPL6/WPL9 JIS SGP & PY400 DIN ST37.0 & ST35.8 ASTM A403 WP 304, 304L 316, 316L

Material Specifications for Butt-Welding Fittings (ASTM)
ASTM A403/A403M-00a
Wrought Austenitic Stainless Steel Piping Fittings

Grade Composition, %
C Mn P S Si Ni Cr Mo
WP 304 0.08 2.00 0.045 0.030 1.00 8.0-11.0 18.0-20.0 -
WP 304L 0.035 2.00 0.045 0.030 1.00 8.0-13.0 18.0-20.0 -
WP 316 0.08 2.00 0.045 0.030 1.00 10.0-14.0 16.0-18.0 2.00-3.00
WP 316L 0.035 2.00 0.045 0.030 1.00 10.0-16.0 16.0-18.0 2.00-3.00

GENERAL NOTE:
All values are maximum unless otherwise indicated.

Tensile and Elongation Requirements WP304, WP316 WP304L, WP316L
Yield Strength, min, ksi [MPa] 30[205] 25[170]
Tensile Strength, min, ksi [MPa] 75[515] 70[485]
Elongation (1) Longitudinal 28 28
Transverse 20 20

NOTE: (1) Standard round specimen, or small proportional specimen, or strip-type specimen, min % in 4D.

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 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
Longitudinal E=48t+15.00
Transverse E=32t+6.50
E = elongation in 2in [50mm], %
t = actual thickness of specimen, in [mm]

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