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Stainless Steel 321 Pipe Fittings

Stainless Steel Pipe Fittings

ASTM A403 WP 321 Stainless Steel Pipe Fittings Specifications

Material Grades

  • ASTM A403 WP 321
  • UNS S32100
  • Werkstoff No. 1.4541
  • JIS SUS 321
  • EN X6CrNiTi18-10
  • Stainless Steel 321
  • SS 321 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
  • Wye

Manufacturing Standards

  • ASTM A403
  • ASME B16.9
  • ASME B16.28
  • MSS SP-43
  • JIS B2312
  • JIS B2313
  • DIN Standards
  • EN Standards

Size & Schedule

  • Size: DN 15 – DN 1000
  • Size: NPS 1/2" – 40"
  • Schedule 10S
  • Schedule 40S
  • Schedule 80S
  • Standard & Custom Sizes

Pressure & Connection

  • Class 150
  • Class 300
  • Butt Weld Connection
  • Weld End Connection
  • Flanged Connection
  • Threaded Connection
  • Pressure-Temperature Ratings

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 – 19.00%
  • Nickel: 9.00 – 12.00%
  • Nitrogen: 0.10% Max.
  • Titanium: 5(C+N) – 0.70% Max.

Physical Properties

  • Density: 7.9 g/cm³
  • Melting Point: 1400°C
  • Melting Point: 2550°F
  • Thermal Expansion: 9.2 × 10⁻⁶ /°F
  • Thermal Conductivity: 20.5 BTU/hr-ft-°F
  • Specific Heat: 0.12 BTU/lbm-°F
  • Elastic Modulus: 28 × 10⁶ PSI

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)
9.00–12.00%
Manganese (Mn)
2.00% max
Silicon (Si)
0.75% max
Phosphorus (P)
0.045% max
Sulfur (S)
0.030% max
Titanium (Ti)
5 × C min.
Nitrogen (N)
0.10% max
Iron (Fe)
Balance
Physical Density: 8.00 g/cm³
Thermal Conductivity at 100°C: 16.1 W/m·K
Specific Heat: 500 J/kg·K

Mechanical Performance

515
MPa (75,000 psi)
Tensile Strength
205
MPa (30,000 psi)
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.