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Stainless Steel 304L Flanges

Stainless Steel Flanges

Stainless Steel Flanges Specifications

Material Grades

  • Stainless Steel 304 / 304L / 304H
  • Stainless Steel 310 / 310S
  • Stainless Steel 316 / 316L / 316H
  • Stainless Steel 317 / 317L
  • Stainless Steel 321 / 321H
  • Stainless Steel 347 / 347H
  • Stainless Steel 446
  • Stainless Steel 904L

Forging Method

  • Closed Die Forging
  • Hot Forging
  • Impression Die Forging
  • Cold Forging
  • Open Die Forging
  • Drop Forging
  • Upset Forging

Flange Testing

  • Radiography Testing
  • Ultrasonic Testing
  • Liquid Penetrant Testing
  • Non-Destructive Testing (NDT)
  • Positive Material Identification (PMI)
  • Dimensional Inspection

Value Added Services

  • Heat Treatment
  • Solution Annealing
  • Pickling & Passivation
  • Shot Blasting
  • Machining
  • Custom Finishing

Manufacturing Standards

  • ASME B16.5
  • ASME B16.47 Series A & B
  • MSS SP-44
  • API 605
  • AWWA Standards
  • ASA Standards
  • Custom Drawings

Flanges Sizes

  • Size: 1/2" – 60"
  • Pressure Class: 150 – 2500 LBS
  • Pressure Rating: PN6 – PN64
  • Faces: FF, RF & RTJ

Flange Dimensions Chart

NPS Flange O.D. (mm) Bolt Hole Ø (mm) Bolt Circle (mm) Thickness (mm) No. Of Bolts
½″ 85.9 14.2 63.5 22.1 4
¾″ 98.6 14.2 63.5 23.4 4
1″ 114.3 14.2 76.2 23.9 4
1¼″ 127.0 15.7 88.9 26.9 4
1½″ 139.7 15.7 88.9 28.4 4
2″ 152.4 15.7 101.6 31.8 4
2½″ 177.8 19.1 114.3 35.1 4
3″ 190.5 19.1 127.0 38.1 4
4″ 203.2 19.1 139.7 41.1 8
5″ 228.6 20.6 165.1 47.8 8
6″ 241.3 20.6 177.8 50.8 8
8″ 266.7 25.4 203.2 57.2 8
10″ 304.8 25.4 228.6 63.5 8
12″ 342.9 28.4 254.0 73.2 8
14″ 381.0 28.4 279.4 79.2 8
16″ 406.4 28.4 304.8 85.9 8
18″ 431.8 31.8 330.2 92.0 8
20″ 457.2 31.8 355.6 98.6 8

Weight Chart

NPS Class Weight / Pc (kg)
½″ 150 As Per Specification
¾″ 150 As Per Specification
1″ 150 As Per Specification
1½″ 150 As Per Specification
2″ 150 As Per Specification
3″ 150 As Per Specification
4″ 150 As Per Specification
6″ 150 As Per Specification
8″ 150 As Per Specification
10″ 150 As Per Specification
12″ 150 As Per Specification

Chemical Composition

Carbon (C)
0.03% max
Manganese (Mn)
2.00% max
Chromium (Cr)
17.50–19.50%
Silicon (Si)
1.00% max
Phosphorus (P)
0.045% max
Sulfur (S)
0.015% max
Nickel (Ni)
8.00–10.50%
Nitrogen (N)
0.10% max
Iron (Fe)
Balance
Density: 7.93 g/cm³
Melting Point: 1400–1450°C
Electrical Resistivity: 0.072 µΩ·cm
Thermal Conductivity: 16.2 W/m·K
Thermal Expansion: 16.0 µm/m·°C
Fatigue Strength: 200 MPa
Impact Toughness: 85 J at -196°C

Mechanical Performance

485
MPa (70,000 psi)
Tensile Strength
170
MPa (25,000 psi)
Yield Strength
193
GPa
Modulus of Elasticity
50%
in 50 mm
Elongation
170
HB
Brinell Hardness
90
HRB
Rockwell Hardness


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.