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Stainless Steel 347 Pipe Fittings

Stainless Steel Pipe Fittings

ASTM A403 WP 347 Stainless Steel Pipe Fittings Specifications

Material Grades

  • ASTM A403 WP 347
  • UNS S34700
  • Werkstoff No. 1.4550
  • JIS SUS 347
  • EN X6CrNiNb18-10
  • Stainless Steel 347
  • SS 347 Buttweld Fittings

Fittings Types

  • 90 Degree Elbow
  • 45 Degree Elbow
  • 180 Degree Return Bend
  • Equal Tee
  • Reducing Tee
  • Concentric Reducer
  • Eccentric Reducer
  • Pipe End Cap
  • Stub End
  • Cross
  • Adapter
  • Wye

Manufacturing Standards

  • ASTM A403
  • ASME B16.9
  • ANSI B16.28
  • MSS SP-43 Type A
  • MSS SP-43 Type B
  • JIS B2312
  • JIS B2313
  • DIN Fittings
  • EN Fittings
  • ISO Fittings
  • NPT Fittings

Size & Schedule

  • Size: NPS 1/2" – NPS 48"
  • Schedule: 5 – XXS
  • Schedule 5S
  • Schedule 10S
  • Schedule 20S / 30S
  • Schedule 40S / 80S
  • Schedule 100 / 120
  • Schedule 140 / 160
  • STD / XS / XXS

Connection & Pressure

  • Butt Weld Connection
  • Threaded Connection
  • Weld Connection
  • Flanged Connection
  • Clamp End
  • End Bell
  • Class 150
  • Class 300
  • Class 600
  • Class 1500
  • Class 2500

Mechanical Properties

  • Tensile Strength: 515 MPa Min.
  • Tensile Strength: 75,000 PSI Min.
  • Yield Strength: 205 MPa Min.
  • Yield Strength: 30,000 PSI Min.
  • Elongation: 35% Min.

Chemical Composition

  • Carbon: 0.08% Max.
  • Manganese: 2.0% Max.
  • Silicon: 1.0% Max.
  • Phosphorus: 0.045% Max.
  • Sulfur: 0.030% Max.
  • Chromium: 17.00 – 20.00%
  • Nickel: 9.00 – 13.00%
  • Columbium: 10 × C – 1.10%
  • Iron: 62.74% Min.

Physical Properties

  • Density: 7.96 g/cm³
  • Density: 0.288 lb/in³
  • Elastic Modulus: 193 GPa
  • Elastic Modulus: 28 × 10⁶ PSI
  • Melting Range: 1398–1446°C
  • Melting Range: 2550–2635°F

Pressure-Temperature Rating

  • Pressure Class: 150
  • Pressure Class: 300
  • Temperature Range: -20°F to 550°F
  • High Temperature Applications
  • Pressure-Temperature Rated Fittings

Value Added Services

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

Pipe Fittings Dimensions Chart

NPS Bolt Circle (mm) Flange O.D. (mm) Thickness (mm) Bolt Hole Ø (mm) No. Of Bolts
½″ 60.5 90 11.2 15.7 4
1″ 79.2 108 14.2 15.7 4
2″ 120.7 152 19.1 19.1 4
4″ 190.5 229 22.4 19.1 8
6″ 241.3 279 23.9 22.4 8
8″ 298.5 343 25.4 22.4 8
10″ 362.0 406 28.4 25.4 12
12″ 431.8 483 31.8 25.4 12

Weight Chart

NPS Class Weight / Pc (kg)
½″ 150 0.9
1″ 150 1.6
2″ 150 3.0
4″ 150 6.4
6″ 150 10.8
8″ 150 17.6
10″ 150 27.9
12″ 150 39.5

Chemical Composition

Carbon (C)
0.08% max
Chromium (Cr)
17.00–19.00%
Nickel (Ni)
9.00–13.00%
Manganese (Mn)
2.00% max
Silicon (Si)
1.00% max
Phosphorus (P)
0.045% max
Sulfur (S)
0.030% max
Columbium / Niobium (Cb / Nb)
10 × C min. – 1.00% max
Iron (Fe)
Balance
Physical Density: 7.96 g/cm³
Thermal Conductivity at 100°C: 16.3 W/m·K
Modulus of Elasticity: 193 GPa

Mechanical Performance

515
MPa (75,000 psi)
Tensile Strength
205
MPa (30,000 psi)
Yield Strength
40%
minimum
Elongation
92
HRB maximum
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.