N08904 A673 Stainless Steel 904L Pipe Fittings

ASTM A403 WP 904L Stainless Steel Pipe Fittings Specifications

Material Grades

ASTM A403 WP 904L
UNS N08904
Werkstoff No. 1.4539
Stainless Steel 904L
SS 904L Buttweld Fittings
904L Austenitic Stainless Steel
Low Carbon Stainless Steel 904L

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
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
DIN Standards
EN Standards
ISO Standards

Size & Schedule

Size: NPS 1/2" – NPS 48"
Schedule 5
Schedule 10S
Schedule 20S
Schedule 40S
Schedule 80S
Schedule 120 / 160
Schedule XS / XXS

Connection & Pressure

Seamless (SMLS) Fittings
Butt Weld (BW) Fittings
Welded Fittings
Clamp End
Flange Connection
End Bell
Threaded Connection
Weld Connection
Pressure Rating: 150–2500 LBS

Mechanical Properties

Tensile Strength: 490 MPa Min.
Tensile Strength: 71,000 PSI Min.
Yield Strength: 205 MPa Min.
Yield Strength: 32,000 PSI Min.
Elongation: 35% Min.

Chemical Composition

Carbon: 0.020% Max.
Manganese: 2.00% Max.
Silicon: 1.00% Max.
Phosphorus: 0.040% Max.
Sulfur: 0.030% Max.
Chromium: 19.00 – 23.00%
Molybdenum: 4.00 – 5.00%
Nickel: 23.00 – 28.00%
Nitrogen: 1.00 – 2.00%

Physical Properties

Density: 7.95 g/cm³
Melting Point: 1350°C
Melting Point: 2550°F
High Corrosion Resistance
Excellent Acid Resistance
High Alloy Austenitic Structure

Applications

Chemical Processing Industry
Pharmaceutical Industry
Utility Scrubber Assemblies
Phosphoric Acid Applications
Sulphuric Acid Applications
Acid Processing Equipment
Corrosive Service Applications

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)

0.020% max

Chromium (Cr)

19.00–23.00%

Nickel (Ni)

23.00–28.00%

Molybdenum (Mo)

4.00–5.00%

Copper (Cu)

1.00–2.00%

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: 7.95 g/cm³

Melting Point: 1350 °C

Modulus of Elasticity: 195 GPa

Mechanical Performance

490

MPa (71,000 psi)

Tensile Strength

220

MPa (32,000 psi)

Yield Strength

35%

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.