S31603 / A312 | Stainless Steel 316L Pipe Fittings

ASTM A403 WP 316L Stainless Steel Pipe Fittings Specifications

Material Grades

ASTM A403 WP 316L
UNS S31603
Werkstoff No. 1.4404 / 1.4435
JIS SUS 316L
BS 316S11 / 316S13
EN X2CrNiMo17-12-2 / X2CrNiMo18-14-3
AFNOR Z3CND17-11-02 / Z3CND18-14-03
GOST 03Ch17N14M3 / 03Ch17N14M2

Fittings Types

Tee
Reducer
Cap
Stub End
Adapter
Wye
Cross
Bend
90 Degree Elbow
45 Degree Elbow
Concentric Reducer
Eccentric Reducer

Manufacturing Standards

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

Size & Schedule

Size: 1/2" – 48"
Schedule 5S
Schedule 10S
Schedule 20S
Schedule 40S
Schedule 80S
Schedule 160
Schedule XXS

Pressure & Connection

Pressure Rating: 150# – 2500#
Threaded Connection
Weld Connection
Flange Connection
Clamp End
End Bell
Seamless Fittings
Welded Fittings

Mechanical Properties

Tensile Strength: 485 MPa Min.
Yield Strength: 170 MPa Min.
Elongation: 40% Min.
Rockwell Hardness: 95 HRB Max.
Brinell Hardness: 217 HB Max.

Chemical Composition

Carbon: 0.00 – 0.03%
Manganese: 0 – 2.00%
Silicon: 0.00 – 1.00%
Phosphorus: 0.00 – 0.05%
Sulfur: 0.00 – 0.02%
Chromium: 16.50 – 18.50%
Molybdenum: 2.00 – 2.50%
Nickel: 10.00 – 13.00%
Titanium: Not Specified
Iron: Balance

Physical Properties

Density: 8000 kg/m³
Elastic Modulus: 193 GPa
Thermal Expansion: As Per Standard
Thermal Conductivity: As Per Standard
Specific Heat: As Per Standard
Electrical Resistivity: As Per Standard

Pressure-Temperature Rating

Pressure Class: 150
Pressure Class: 300
Temperature Range: -20°F to 550°F
Temperature Range: -29°C to 288°C
Pressure-Temperature Rated Fittings

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)

0.03% max

Chromium (Cr)

16.00–18.00%

Nickel (Ni)

10.00–14.00%

Molybdenum (Mo)

2.00–3.00%

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

485

MPa (70 ksi)

Tensile Strength

170

MPa (25 ksi)

Yield Strength

40%

minimum

Elongation

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.

Material Selection

Prime 304 stainless steel billet sourced and certified.

Billet Preparation

Heat to 1100°C – 1250°C for optimal forgeability.

Forging

Shape billet into flange geometry under controlled pressure.

Heat Treatment

Solution anneal at 1040°C – 1120°C, then quench.

Machining & Finishing

CNC machining, drilling, and surface finishing.

Testing & Inspection

Tensile, hardness, PMI, visual and impact tests performed.