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Stainless Steel 316H 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

Nominal Pipe Size Outside Diameter (O) Thickness (T) Bolt Hole Diameter Bolt Circle Diameter No. of Bolts
½″88.9 mm11.18 mm15.75 mm60.45 mm4
¾″98.55 mm12.70 mm15.75 mm69.85 mm4
1″107.95 mm14.22 mm15.75 mm79.25 mm4
1¼″117.35 mm15.75 mm15.75 mm88.90 mm4
1½″127.00 mm17.27 mm15.75 mm98.55 mm4
2″152.40 mm19.05 mm19.05 mm120.65 mm4
2½″177.80 mm22.35 mm19.05 mm139.70 mm4
3″190.50 mm23.88 mm19.05 mm152.40 mm4
3½″215.90 mm23.88 mm19.05 mm177.80 mm8
4″228.60 mm23.88 mm19.05 mm190.50 mm8
5″254.00 mm23.88 mm22.35 mm215.90 mm8
6″279.40 mm25.40 mm22.35 mm241.30 mm8
8″342.90 mm28.45 mm22.35 mm298.45 mm8
10″406.40 mm30.23 mm25.40 mm361.95 mm12
12″482.60 mm31.75 mm25.40 mm431.80 mm12
14″533.40 mm35.05 mm28.45 mm476.25 mm12
16″596.90 mm36.58 mm28.45 mm539.75 mm16
18″635.00 mm39.62 mm31.75 mm577.85 mm16
20″698.50 mm42.93 mm31.75 mm635.00 mm20
22″749.30 mm45.97 mm35.05 mm692.15 mm20
24″812.80 mm47.75 mm35.05 mm749.30 mm20

Weight Chart

Nominal Pipe Size Weight
½″As Per Specification
¾″As Per Specification
1″As Per Specification
1¼″As Per Specification
1½″As Per Specification
2″As Per Specification
2½″As Per Specification
3″As Per Specification
3½″As Per Specification
4″As Per Specification
5″As Per Specification
6″As Per Specification
8″As Per Specification
10″As Per Specification
12″As Per Specification
14″As Per Specification
16″As Per Specification
18″As Per Specification
20″As Per Specification
22″As Per Specification
24″As Per Specification

Chemical Composition

Carbon (C)
0.10% Max
Manganese (Mn)
2.00% Max
Silicon (Si)
0.75% Max
Phosphorus (P)
0.045% Max
Sulfur (S)
0.030% Max
Chromium (Cr)
16.00 – 18.00%
Molybdenum (Mo)
2.00 – 3.00%
Nickel (Ni)
10.00 – 14.00%
Nitrogen (N)
68.89% Min

Physical Properties

Grade SS 316H
UNS S31609
Werkstoff No. 1.4401
Density 8.0 g/cm3
Melting Point 1400 °C (2550 °F)
Manufacturing Forged, Heat Treated & Machined
Standard ASTM A182 / ASME SA182
Tensile Strength
515 MPa
75,000 Psi
Yield Strength
205 MPa
30,000 Psi
Elongation
35 %
Minimum Elongation
Melting Point
1400 °C
2550 °F


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.