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Appendix A1

Materials for Wellheads

Working temperature

Temperature class Operating range
° F ° C
Min. Max. Min. Max.
K -70 180 -60 82
L -50 180 -46 82
P -20 180 -29 82
R Room temperature Room temperature
S 0 150 -18 66
T 0 180 -18 82
U 0 250 -18 121
V 35 250 2 121

Working fluids (according with Material class)

Fluids class Partial pressure
H2S CO2 API class material
General service Noncorrosive <0,35 x 10-3 <0,05 AA
Light corrosive 0,05-0,21 BB
Temperature and
high corrosive		 >0,21 CC
Sour service (in acc.
With NACE MR-01 75)		 Noncorrosive >0,35 x 10-3 >0,05 DD
Light corrosive 0,05-0,21 EE
Temperature and
high corrosive		 >0,21 FF

Materials for Wellheads

  AA BB CC DD EE FF
Body A487-4C
A322-4130		 A276-410 A487-4C
A322-4130
HB max. 235		 A276-410
HB max.235
Casing hanger A487-4C
AISI 8620		 A276-410 A487-4C
AISI 8620
HB max. 235		 A276-410
HB max.235
Tubing hanger A322-4130 A276-410
17-4PH		 A322-4130
HB max. 235		 17-4PH
HRC 29-33
Studs and nuts B7/2H or L7/2H1) B7M/2HM or L7M/2HM1)
Ring gasket API 6A/S4 F 304L API 6A/S4 F 304L
Pack-off NBR HNBR

1) – only for Temp. class L, K