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Alloy Steel A182 F11 Flanges

Alloy Steel Flanges

Alloy Steel A182 F11 Flanges Specifications

Material Grades

  • Alloy Steel F11
  • ASTM A182 F11
  • ASME SA182 F11
  • F11 Class 1 / Class 2 / Class 3
  • UNS K11597 – Class 1
  • UNS K11572 – Class 2 & Class 3
  • 1.25Cr-0.5Mo Alloy Steel
  • Chrome-Moly Alloy Steel

Flange Types

  • Weld Neck Flanges
  • Slip On Flanges
  • Blind Flanges
  • Socket Weld Flanges
  • Threaded Flanges
  • Lap Joint Flanges
  • Long Weld Neck Flanges
  • Orifice Flanges
  • Ring Type Joint Flanges
  • High Hub Blind Flanges

Flange Testing

  • Positive Material Identification (PMI)
  • Ultrasonic Testing
  • Magnetic Particle Testing
  • Radiographic Testing
  • Hydrostatic Testing
  • Tensile Testing
  • Hardness Testing
  • Dimensional Inspection

Value Added Services

  • Normalizing
  • Tempering
  • Heat Treatment
  • Machining
  • Pickling & Cleaning
  • Shot Blasting
  • Custom Finishing
  • Custom Marking

Manufacturing Standards

  • ASTM A182 F11
  • ASME SA182 F11
  • ASME B16.5
  • ASME B16.47 Series A & B
  • ASME B16.36
  • MSS SP-44
  • EN 1092-1
  • DIN Standards
  • Custom Drawings

Flanges Sizes

  • Size: 1/2" – 24" per ASME B16.5
  • Large Diameter: 26" – 60" per ASME B16.47
  • Pressure Class: 150 – 2500 LBS
  • Pressure Rating: According to ASME B16.5
  • Faces: RF, FF & RTJ

ASTM A182 F11 Flanges Dimensions Chart

Nominal Size (NPS) Flange O.D. (mm) Flange Thickness (mm) Bolt Hole Diameter (mm) No. of Bolt Holes Bolt Circle Diameter (mm)
½″ 73.15 16.00 14.22 4 69.85
¾″ 85.85 19.05 14.22 4 85.85
1″ 101.60 22.23 17.53 4 101.60
1½″ 127.00 25.40 19.05 4 114.30
2″ 152.40 28.70 20.57 4 127.00
3″ 200.15 31.75 26.92 6 152.40
4″ 228.60 35.05 35.05 8 177.80
6″ 279.40 44.45 44.45 8 228.60
8″ 330.20 50.80 52.32 8 279.40
10″ 381.00 57.15 60.45 12 330.20
12″ 431.80 63.50 69.85 12 381.00

Chemical Composition

Carbon (C)
0.05–0.15%
Chromium (Cr)
1.25–1.75%
Molybdenum (Mo)
0.44–0.65%
Silicon (Si)
0.20–0.40%
Nickel (Ni)
0.40% max
Phosphorus (P)
0.025% max
Iron (Fe)
Balance
Density: 7.80 g/cm³
Melting Point: 1425–1480°C
Thermal Conductivity: 40.0 W/m·K
Specific Heat Capacity: 500 J/kg·K
Electrical Resistivity: 0.5 µΩ·cm
Coefficient of Thermal Expansion: 12.0 × 10−6/°C
Magnetic Permeability: Non-magnetic

Mechanical Performance

580–800
MPa
Tensile Strength
275
MPa minimum
Yield Strength
20%
minimum
Elongation
95
HRB maximum
Hardness
Modulus of Elasticity: 190 GPa
Poisson's Ratio: 0.30
Material Grade: ASTM A182 F11 Class 2
UNS: K11572


MANUFACTURING

Forging Process

Each flange follows a rigorous 8-step forging and quality-control process to ensure conformance with ASTM A182 and ASME standards.

1

Material Selection

Prime 304 stainless steel billet sourced and certified.

2

Billet Preparation

Heat to 1100°C – 1250°C for optimal forgeability.

3

Forging

Shape billet into flange geometry under controlled pressure.

4

Heat Treatment

Solution anneal at 1040°C – 1120°C, then quench.

5

Machining & Finishing

CNC machining, drilling, and surface finishing.

6

Testing & Inspection

Tensile, hardness, PMI, visual and impact tests performed.