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Alloy Steel A182 F12 Flanges

Alloy Steel Flanges

Alloy Steel A182 F12 Flanges Specifications

Material Grades

  • Alloy Steel F12
  • ASTM A182 F12
  • ASME SA182 F12
  • F12 Class 1 / Class 2
  • UNS K11562 – Class 2
  • 1Cr-0.5Mo Alloy Steel
  • Chrome-Moly Alloy Steel
  • W.Nr. 1.7335 / 13CrMo4-5

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 F12
  • ASME SA182 F12
  • 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: PN2.5 – PN400
  • Faces: RF, FF & RTJ

ASTM A182 F12 Flanges Dimensions Chart

Nominal Size (NPS) Outside Diameter (mm) Thickness (mm) Bolt Hole Diameter (mm) Bolt Circle Diameter (mm)
1″ 60.45 6.35 4.83 44.45
1½″ 79.25 6.35 4.83 50.80
2″ 98.55 6.35 4.83 60.45
2½″ 114.30 6.35 4.83 69.85
3″ 130.05 6.35 4.83 76.20
4″ 161.93 6.35 6.35 101.60
5″ 190.50 6.35 6.35 127.00
6″ 219.08 6.35 6.35 139.70
8″ 273.05 9.53 9.53 177.80
10″ 327.15 9.53 9.53 215.90
12″ 381.00 9.53 9.53 254.00

ASTM A182 F12 Flanges Weight Chart

Nominal Size (NPS) Outside Diameter (mm) Thickness (mm) Approximate Weight (kg)
1″ 60.45 6.35 0.90
1½″ 79.25 6.35 1.35
2″ 98.55 6.35 2.00
2½″ 114.30 6.35 2.85
3″ 130.05 6.35 3.75
4″ 161.93 6.35 6.80
5″ 190.50 6.35 8.10
6″ 219.08 6.35 10.00
8″ 273.05 9.53 15.80
10″ 327.15 9.53 21.30
12″ 381.00 9.53 27.60

Chemical Composition

Carbon (C)
0.05–0.15%
Chromium (Cr)
1.00–1.50%
Molybdenum (Mo)
0.40–0.60%
Silicon (Si)
0.50% max
Nickel (Ni)
0.40% max
Phosphorus (P)
0.025% max
Iron (Fe)
Balance
Density: 7.75 g/cm³
Melting Point: 1380–1440°C
Thermal Conductivity: 28.0 W/m·K
Specific Heat Capacity: 460 J/kg·K
Electrical Resistivity: 0.75 Ω·mm²/m
Thermal Expansion: 14.3 × 10−6/°C

Mechanical Performance

485
MPa minimum
Tensile Strength
205
MPa minimum
Yield Strength
22%
minimum
Elongation
95
HRB maximum
Hardness
Impact Strength: 27 J at -46°C
Modulus of Elasticity: 200 GPa
Poisson's Ratio: 0.29
Material Grade: ASTM A182 F12 Class 2
UNS: K11564


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.