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Stainless Steel 347 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 Bolt Circle (mm) Flange O.D. (mm) Thickness (mm) Bolt Hole Ø (mm) No. Of Bolts
½″ 60 89 As Per Class 16 4
¾″ 67 95 As Per Class 16 4
1″ 67 95 As Per Class 16 4
1¼″ 83 121 As Per Class 22 4
1½″ 83 121 As Per Class 22 4


Weight Chart

NPS Flange Type Weight / Pc (kg)
½″ to 48″ Stainless Steel 347 Flanges As Per Specification

Chemical Composition

Carbon (C)
0.08% max
Manganese (Mn)
2.00% max
Silicon (Si)
1.00% max
Phosphorus (P)
0.045% max
Sulfur (S)
0.030% max
Chromium (Cr)
17.00–20.00%
Columbium (Cb)
10 × C − 1.10
Nickel (Ni)
9.00–13.00%
Iron (Fe)
62.74% min

Physical Properties

Material Grade: Stainless Steel 347
UNS: S34700
Werkstoff No.: 1.4550
JIS: SUS 347
EN: X6CrNiNb18-10
Density: 8.0 g/cm³
Melting Point: 1454 °C (2650 °F)
Material Standard: ASTM A182 / ASTM A240
Size Range: ½″ to 48″
Pressure Class: 150#, 300#, 600#, 900#, 1500#, 2500#

Mechanical Performance

515
MPa (75,000 psi)
Tensile Strength
205
MPa (30,000 psi)
Yield Strength
35
%
Elongation
8.0
g/cm³
Density
1454
°C
Melting Point
1.4550
Werkstoff No.
Material Grade


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.