ASTM A182 F11 Weld neck Flange ASME B16.5 WNRF Flange

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ASTM A182 F11 is a forged alloy steel pipe flanges material grade intended for high-temperature service.

Chromoly F11 (Cr-Mo) is part of the Chromoly family of low-alloy steel – an alloy of chromium and molybdenum. Chromoly F11 Flanges are strong, weldable, and cost-effective, which makes them popular in applications across Marine, Navy, and Petrochemical Industries

ASTM A182  covers forged low alloy and stainless steel piping components for use in pressure systems. Included are flanges, fittings, valves

Grade F11  also called 1 1/4 CRMO, often referred to as “one and a quarter chrome

F11 chrome subsets are Class 1, 2, and 3. Each class has a higher yield strength, tensile strength, and Brinell hardness value than the one before it. 

Chrome moly flanges offer a level of chromium not quite reaching the levels of common stainless steels like 304 and 316, but more so than typical A105.  In comparison to carbon steel, the higher levels of chromium provide a superior hardness and overall mechanical integrity, whereas the higher molybdenum content is useful in resisting oxidation and corrosion.

Weld Neck or Welding Neck (WN) flange  includes a long tapered hub that aid in reinforcement and provide temperature / pressure resistance. Bored to match the inside diameter of the mating pipe or fitting, these flanges are directly welded to the end of the pipe.

ASTM A182 F11 Flange is one of the most popular grade used in oil&gas refinery applications.

ASTM A182 F11 Material Equivalent

Material Name Type Of UNS Number Forging Specification Casting Specification Equivalent DIN DIN W. Number Application
Alloy Steel Chrome Moly 1.1/4Cr-1/2Mo K11572 A182-F11 cl2 A217-WC6 13CRM044 1.7335 Up to 593ºC (1100ºF)

Chemical Composition  ASME SA 182  F11 

Grade C Cr Si S Mn P Mo
ASTM A182 F11 0.10 – 0.20 1.00 – 1.50 0.50 – 0.80 0.040 0.40 – 0.65 0.025 0.44 – 0.65

Mechanical Properties of ASTM A182 F11 Class 2

Grade Tensile Strength, min.
ksi [MPa]
Yield Strength, min.
ksi [MPa]
Elongation(2″),
min. %
Area of Reduction,
min. %
Hardness
HBW
F11 Class 2 70 [485] 40 [275] 20 30 143~207

*The material shall be annealed at a temperature no less than 1650°F [900°C].

A182 F11 Flanges Hardness Tests:

Except when only one forging is produced, a minimum of two pieces per batch or continuous run as defined in 9.6.2 shall be hardness tested as specified in Specification A961/A961M to ensure that the forgings are within the hardness limits given for each grade in Table 3. The purchaser may verify that the requirement has been met by testing at any location on the forging provided such testing does not render the forging useless

A182 F11 Flanges Marking

In addition to the marking requirements of Specification A961/A961M, the manufacturer’s name (see Note 3) or symbol shall be permanently marked on each forging.

A182 F11 Flange Certification

In addition to the certification requirements of Specification A961/A961M, test reports shall be furnished to the purchaser or his representative.

Test reports shall include certification that all requirements of this specification have been met.

The specification designation included on test reports shall include year of issue and revision letter, if any. The manufacturer shall provide the following where applicable: Type heat treatment,  Product analysis results, Section 8 of Specification A961/A961M,Tensile property results, Section 9 (Table 3), report the yield strength and ultimate strength, in ksi [MPa], elongation and reduction in area, in percent,  Chemical analysis results,Hardness results, Section 9 Any supplementary testing required by the purchase order.

Flanges Specification of A182 F11 Flanges

ASTM Specifications ASTM A182 and ASME SA182
Dimensions Chart ANSI/ASME B16.5, BS4504, BS 10, B 16.47 Series A & B, B16.48, EN-1092, DIN, etc.
Standard Flange ANSI, ASME, BS, DIN, EN Flange, etc.
Size inch 1/2 inch to 60 inch
Class / Pressure Rating 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64
Type of Flange Face Flate, Raised Face, Ring Type Joint
A182 F11 Welding Neck Flanges-ASME-B2
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ASTM A182 Grade F11 Class 2 Welding neck flanges 12″ SCH80 RTJ, ASME B16.5 Class 600,,