ASTM A694 F52, F60 and F65 flanges for API 6A Equipment

Forged flanges made from ASTM A694 F52, ASTM A694 F60 and ASTM A694 F65 are widely utilized in wellhead and Christmas-tree manifold equipment in oil and gas industry. These flanges are designed as end or outlet connectors to valves or other components. The steel grades F52, F60, and F65 respectively designate the minimum yield strength of the flange as 52 ksi(360 MPa), 60ksi(415 MPa), and 65 ksi(450MPa). According to API 6A clause 5.4, ASTM A694 F52 material are only applicable to weld neck flanges of 2000 psi, 3000 psi and 5000 psi as a material designation 45K. Grade F60 and F65 flanges are available in welding neck, blind, threaded or any custom-design types covering 2000 psi through 10000 psi which is designated as 60K. All of the three steel grades shall be furnished as low alloy steel and the flanges shall be furnished with RTJ end connection(see the specification of metallic ring-joint gaskets for API 6A flanges).

1. Chemical requirements and mechanical properties for ASTM A694 F52 flanges

Chemical Properties of A694 F52
Element	Content, %
Carbon (C)	0.16~0.22
Silicon (Si)	0.15~0.40
Manganese (Mn)	1.10~1.40
Phosphorous (P)	≤ 0.025
Sulfur (S)	≤ 0.012
Molybdenum (Mo)	0.20~0.35
Nickel (Ni)	≤ 0.50
Chromium (Cr)	≤ 0.30
Copper (Cu)	≤ 0.25
C.E.	≤ 0.48

Mechanical Properties of ASTM A694 F52
Tensile Strength, MPa, min.	Yield Strength MPa, min.	Elongation %, Min.	Charpy @-46°C J, min.	Hardness HB, min.
530~700	370	20	47	-

*Heat treatment of quenching and tempering are required for Gr. F52.

ASTM A694 F52 Flange 11" WN RTJ 5000 psi API 6A

ASTM A694 F52 Flange 11" WN RTJ 5000 psi acc. to API 6A

2. Chemical requirements and mechanical properties for ASTM A694 F60 flanges

Chemical Properties of A694 F60
Element	Content, %
Carbon (C)	0.17~0.23
Silicon (Si)	0.15~0.40
Manganese (Mn)	1.20~1.50
Phosphorous (P)	≤ 0.020
Sulfur (S)	≤ 0.012
Molybdenum (Mo)	0.45~0.60
Nickel (Ni)	0.40~1.00
Chromium (Cr)	≤ 0.25
Copper (Cu)	≤ 0.25
Vanadium (V)	≤ 0.050
C.E.	≤ 0.48

Mechanical Properties of ASTM A694 F60
Tensile Strength, MPa, min.	Yield Strength MPa, min.	Elongation %, Min.	Charpy @-46°C J, min.	Hardness HB, min.
620~790	450	20	42	-

*Heat treatment of quenching and tempering are required for Gr. F60.

ASTM A694 F60 flange WN RTJ 3000 psi 11" API 6A Type 6B

3. Chemical requirements and mechanical properties for ASTM A694 F65 flanges

Chemical Properties of A694 F65
Element	Content, %
Carbon (C)	0.17~0.23
Silicon (Si)	0.15~0.40
Manganese (Mn)	1.30~1.60
Phosphorous (P)	≤ 0.025
Sulfur (S)	≤ 0.015
Molybdenum (Mo)	0.45~0.65
Nickel (Ni)	≤ 0.30
Chromium (Cr)	≤ 0.30
Copper (Cu)	≤ 0.25
Niobium (Nb)	0.025~0.050
C.E.	≤ 0.43

Mechanical Properties of ASTM A694 F65
Tensile Strength, MPa.	Yield Strength MPa, min.	Elongation %, Min.	Charpy @-46°C J, min.	Hardness HB.
620~790	450	20	46	155~230

*Heat treatment of quenching and tempering are required for Gr. F65.

ASTM A694 F65 flanges WN RTJ 7-1/16" 10000 psi API 6A Type 6BX for a Houston client.

Views: Author：hbmetals Date:15/12/11