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Manufacturing ISO-9001 Ce
 

a

As defined by NACE Standard MR0175 / ISO 15156.

bIn compliance with NACE Standard MR0175 / ISO 15156.
c

CRA required on retained fluid wetted surfaces only;

CRA cladding of low allow or stainless steel permitted.

d

CRA as defined in API 6A latest edition.

 NACE MR0175 / ISO 15156 definition of CRA does not apply.

 

 Material Class API-6A Minimum Material Requirements Body & Flange

AA-General Service

Carbon or low alloy steel

BB-General Service

Carbon or low alloy steel

CC-General Service

Stainless steel

DD-Sour Service a

Carbon or low alloy steel b

EE-Sour Service a

Carbon or low alloy steel b

FF-Sour Service a

Stainless steel b

HH-Sour Service a

CRA bcd

API-16A Temperature

Classification

Operating Range

 (°F)

T-75

-75 to 250

T-20

-20 to 250

T- 0

- 0 to 250

 

  

API-6A TEMPERATURE CLASSIFICATION

Temperature

Operating Range

Classification *

Degrees Fahrenheit °F

 

Min.

 

Max.

K

-75

to

180

L

-50

to

180

N

-50

to

140

P

-20

to

180

R

Room Temperature

S

0

to

140

T

0

to

180

U

0

to

250

V

35

to

250

     X **

0

to

350

     Y **

0

to

650

  

 
Hardness API-6A
Connectors

Material
Designation

API Minimum
HBW

NACE Maximum
HBW

6B Weld Flanges45K

140

237

Integral Flanges and Hubs, and 6BX Weld Neck Flanges.60K*

174*

237

75K*

197*

237

*

75K material can substitute for 60K material

 

 

Designated material property requirements for bodies, bonnets and end and outlet connections

Material Designation

0.2% Yield Strength
min.
(psi)

Tensile Strength
min.
(psi)

Elongation in 50 mm (2 in)
min.
%

Reduction in Area
min.
%

36K

36,000

70,000

21

Not Required

45K

45,000

70,000

19

32

60K

60,000

85,000

18

35

75K

75,000

95,000

17

35

 

 

API Spec 6A specifies ring gaskets.

  MATERIAL  MARKED  MAX. HBW
  Soft Iron **  D-4  103
  Low Carbon Steel   S-4  121
  304 Stainless Steel  S-304-4  158
  316 Stainless Steel  S-316-4  158