ASTM A182 F11 Weld neck Flange ASME B16.5 WNRF WNRTJ
We are a professional manufacturer of steel forged chome moly steel A182 F11 flange in China,A182 F11 weld neck flange,ASME B16.5/ANSI B16.5 , Chrome Moly Alloy Steel Flange,A182 F11 Cl2 Flange，
As an experienced A182 F11 flange manufacturer in China,we produce high quality A182 F11 forged flanges.
ASTM A182 F11 Chrome moly alloy flanges offer improved levels of chromiumand molybdenum. The added chromium helps increase the steel’s hardenability and corrosion resistance, whereas the increased molybdenum helps bolster itstoughness and corrosion resistance.
ASTM A182 F11 flanges are extremely ductile, strong and tough and easy to weld and offer oxidation and scaling resistance.which matches with ASTM A335 Gr P11 alloy steel pipes ,A234 WP11 Pipe fittings
ASTM A182 F11
also known as (13CrMo4-5) 1 1/4 Chrome 1/2 Mo Flanges ,1.25 chrome 0.5 moly ,which is a chromium-molybdenum based low alloy-steel grade. It is characterized by 1 to 1.5% chromium – an average of 1%, hence the numerical nomenclature. All of our material is supplied in F11 Class 2 (CL 2), although we can also supply Class 1 or Class 3 upon request.
In some cases,A182 F11 Flange also can be used as an equivalent grade to 16Mo3 Flange
ASTM A182 F11 Flange specification
Dimensions : ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges etc.
What is ASTM A182 F11 Material?
ASTM A182 F11 is a Chrome-Moly alloy steel (Cr-Mo), primarily used for high-temperature service. It contains chromium (1.00–1.50%) and molybdenum (0.44–0.65%) for improved corrosion resistance and strength at elevated temperatures. F11 is commonly used in pressure vessels, boilers, and heat exchangers.
Key Features of Our F11 Weld Neck Flanges:
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Material Grade: ASTM A182 F11, Class 1 / Class 2
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Flange Type: Weld Neck (WNRF – Weld Neck Raised Face,WNRTJ,Weld neck Ring Joint)
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Size Range: 1/2” to 48”
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Pressure Ratings: Class 150, 300, 600, 900, 1500, 2500
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Standards: ASME B16.5, B16.47 Series A/B, MSS SP-44, DIN, EN 1092-1
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Face Types: Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF)
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Testing: 100% PMI, UT, RT, and Hydro Testing available
ASTM A182 standard
Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
ASTM A182 F11 Flanges Chemical Composition
| Grade | C | Mn | Si | S | P | Cr | Mo |
| A182 F11 | 0.05 – 0.15 | 0.3 – 0.6 | 0.5 – 1 | 0.03 | 0.03 | 1 – 1.5 | 0.044 – 0.65 |
ASTM A182 F11 Flange Mechanical properties
| Grade | Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation % |
| A182 F11 | 205 | 415 | 20 |
Heat treatment of ASTM A182/A182M F11
The starting material of the ASTM A182 Gr. F11 Cl. 2 flange shall be low-alloy ferritic steels made by the open-hearth, electric-furnace, or basic-oxygen process with the option of separate degassing and refining processes in each case. The material shall be forged as close as practicable to the specified flange shape and size. After hot forging, the flange sahll be cooled to a temperature below 538°C [1000°F] prior to heat treating. ASME B16.5 or ASME B16.47 flanges made of ASTM A182 Gr. F11 Cl. 2 steels shall be furnished in normalizing and tempering condition only. The minimum austenitizing temperature is 900°C [1650°F]. The normalizing requires air cooling, which is followed by tempering with minimum tempering temperature of 620°C [1150°F].
ASTM A182/A182M F11 Hardness requirement
NACE MR01-75 specifies 237 maximum brinell hardness for A182 F11
How to order our A182 F11 Flanges？
Example#1, ASME B16.5 WNRF Flange, ASTM A182 F11 Class 2, 1 Inch, CL600
Example#2, ASME B16.5 Weld neck Flange, Raise face,ASTM A182 F11 Class 2, 6 Inch, CL600
Example#3, ASME B16.5 blind Flange RF, ASTM A182 F11 , 6 Inch, CL300
ASTM A182 F11 — Cl 1, Cl 2, and Cl 3 comparison
There 3 classes in ASTM A182 F11 grade.they have the same chemical compostion.
The main differences between Class 1, Class 2, and Class 3 are in their heat treatment, mechanical properties, and minimum strength requirements:
Mechanical Properties of ASTM A182 F11
| Grade Symbol | Tensile Strength, min, ksi [MPa] | Yield Strength, min, ksi [MPa] | Elongation in 2 in. [50 mm] or 4D, min, % | Reduction of Area, min, % | Brinell Hardness Number, HBW, unless otherwise indicated |
|---|---|---|---|---|---|
| F 11 Class 1 | 60 [415] | 30 [205] | 20 | 45 | 121 – 174 |
| F 11 Class 2 | 70 [485] | 40 [275] | 20 | 30 | 143 – 207 |
| F 11 Class 3 | 75 [515] | 45 [310] | 20 | 30 | 156 – 207 |
Heat Treatment of ASTM 182 F11 WN Flanges
✅ A182 F11 Class 1: normalizing (900°C–940°C or 1650°F–1720°F) + tempering (at minimum 650°C or 1200°F)
✅ A182 F11 Class 2: normalizing (900°C–940°C), liquid quenching (typically in water or oil), then tempering (at minimum 650°C or 1200°F)
✅ A182 F11 Class 3: liquid quenching (typically in water or oil) following normalizing, then tempering (at minimum 650°C or 1200°F) — yielding higher strength
Looking for a trusted ASTM A182 F11 weld neck flange supplier at competitive prices? Contact us today and submit your RFQ. We provide mill test certificates, third-party inspection, and international shipping.
