S31600 A312 Stainless Steel 316 Pipe Fittings

ASTM A403 WP 316 Stainless Steel Pipe Fittings Specifications

Material Grades

ASTM A403 WP 316
UNS S31600
Werkstoff No. 1.4401 / 1.4436
JIS SUS 316
BS 316S31 / 316S33
EN X5CrNiMo17-12-2 / X3CrNiMo17-13-3
AFNOR Z7CND17-11-02
Stainless Steel 316

Fittings Types

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

Manufacturing Standards

ASTM A403
ASME B16.9
ASME 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 & Thickness

Size: 1/2" – 48"
Schedule 5S
Schedule 10S
Schedule 20S
Schedule 30S
Schedule 40S / S40
Schedule 60S
Schedule 80S / S80
Schedule 100 / S100
Schedule 120 / S120
Schedule 140 / S140
Schedule 160 / S160
STD / XS / XXS

Pressure & Connection

Class 150
Class 300
Class 600
Class 1500
Class 2500
End Bell Connection
Flange Connection
Threaded Connection
Weld Connection

Mechanical Properties

Tensile Strength: 515 MPa Min.
Yield Strength: 205 MPa Min.
Elongation: 40% Min.
Rockwell Hardness: 95 HRB Max.
Brinell Hardness: 217 HB Max.

Chemical Composition

Carbon: 0.00 – 0.07%
Manganese: 0.00 – 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%
Iron: Balance

Physical Properties

Density: 8000 kg/m³
Elastic Modulus: 193 GPa
Thermal Expansion: 15.9 µm/m·°C
Thermal Conductivity: 16.3 W/m·K
Specific Heat: 500 J/kg·K
Electrical Resistivity: 740 nΩ·m

Temperature Rating

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

0.08% 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

515

MPa (75 ksi)

Tensile Strength

205

MPa (30 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.