S31703 A312 Stainless Steel 317L Pipe Fittings

ASTM A403 WP 317L Stainless Steel Pipe Fittings Specifications

Material Grades

ASTM A403 WP 317L
UNS S31703
Werkstoff No. 1.4438
Stainless Steel 317L
SS 317L Buttweld Fittings
Wrought Austenitic Stainless Steel
Low Carbon 317L Stainless Steel

Fittings Types

90 Degree Elbow
45 Degree Elbow
180 Degree Return Bend
Equal Tee
Reducing Tee
Concentric Reducer
Eccentric Reducer
Pipe Cap / 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 80 / 100 / 120
Custom Sizes Available

Connection & Pressure

Weld Connection
Flanged Connection
Clamp End
Threaded Connection
End Bell
Pressure Class: 150 LBS – 2500 LBS

Mechanical Properties

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

Chemical Composition

Carbon: 0.035% Max.
Manganese: 2.0% Max.
Silicon: 1.0% Max.
Phosphorus: 0.045% Max.
Sulfur: 0.030% Max.
Chromium: 18.00 – 20.00%
Molybdenum: 3.00 – 4.00%
Nickel: 11.00 – 15.00%
Iron: Balance

Physical Properties

Density: 7.9 g/cm³
Melting Point: 1400°C
Melting Point: 2550°F
High Temperature Strength
Excellent Corrosion Resistance

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)

0.035% max

Chromium (Cr)

18.00–20.00%

Nickel (Ni)

11.00–15.00%

Molybdenum (Mo)

3.00–4.00%

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: 7.9 g/cm³

Thermal Conductivity: 14.6 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

35%

minimum

Elongation

217

HB 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.