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Stainless Steel 304 Pipe Fittings

Stainless Steel Pipe Fittings

ASTM A403 WP 304 Stainless Steel Pipe Fittings Specifications

Material Grades

  • ASTM A403 WP 304
  • UNS S30400
  • Werkstoff No. 1.4301
  • Stainless Steel 304
  • JIS SUS 304
  • BS 304S31
  • SS 304 Buttweld Fittings

Fittings Types

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

Manufacturing Standards

  • ASTM A403
  • ASME B16.9
  • ASME B16.28
  • MSS SP-43 Type A
  • MSS SP-43 Type B
  • JIS B2312
  • JIS B2313

Size & Schedule

  • Size: NPS 1/2" – NPS 48"
  • Schedule: 20S – Schedule 160
  • Standard Sizes
  • Custom Sizes
  • Seamless Fittings
  • Welded Fittings

Connection & Pressure

  • Butt Weld Connection
  • Threaded Connection
  • Clamp End
  • Weld End
  • Flanged End
  • End Bell
  • Class 150
  • Class 300
  • Class 400
  • Class 1500
  • Class 2500

Mechanical Properties

  • Tensile Strength: 515 MPa Min.
  • Yield Strength: 205 MPa Min.
  • Elongation: 40% Min.
  • Rockwell Hardness: 92 HRB Max.
  • Brinell Hardness: 201 HB Max.

Physical Properties

  • Density: 8000 kg/m³
  • Elastic Modulus: 193 GPa
  • Thermal Expansion: 17.2 × 10⁻⁶ /°C
  • Thermal Conductivity: 16.2 W/m·K
  • Specific Heat: 500 J/kg·K
  • Electrical Resistivity: 720 nΩ·m

Chemical Composition

  • Chromium: 18.0 – 20.0%
  • Nickel: 8.0 – 10.5%
  • Carbon: 0.08% Max.
  • Manganese: 2.0% Max.
  • Silicon: 0.75% Max.
  • Phosphorus: 0.045% Max.
  • Sulfur: 0.030% Max.
  • Nitrogen: 0.10% Max.

Value Added Services

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

Flange 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)
18.00–20.00%
Nickel (Ni)
8.00–12.00%
Manganese (Mn)
2.00% max
Silicon (Si)
1.00% max
Phosphorus (P)
0.045% max
Sulfur (S)
0.030% max
Iron (Fe)
Balance
Physical Density: 8000 kg/m³
Thermal Conductivity at 100°C: 16.2 W/m·K
Specific Heat: 500 J/kg·K

Mechanical Performance

515
MPa (75 ksi)
Tensile Strength
205
MPa (30 ksi)
Yield Strength
40%
minimum
Elongation
95
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.