Stainless Steel 446 Flanges - S44600

Stainless Steel Flanges Specifications

Material Grades

Stainless Steel 304 / 304L / 304H
Stainless Steel 310 / 310S
Stainless Steel 316 / 316L / 316H
Stainless Steel 317 / 317L
Stainless Steel 321 / 321H
Stainless Steel 347 / 347H
Stainless Steel 446
Stainless Steel 904L

Forging Method

Closed Die Forging
Hot Forging
Impression Die Forging
Cold Forging
Open Die Forging
Drop Forging
Upset Forging

Flange Testing

Radiography Testing
Ultrasonic Testing
Liquid Penetrant Testing
Non-Destructive Testing (NDT)
Positive Material Identification (PMI)
Dimensional Inspection

Value Added Services

Heat Treatment
Solution Annealing
Pickling & Passivation
Shot Blasting
Machining
Custom Finishing

Manufacturing Standards

ASME B16.5
ASME B16.47 Series A & B
MSS SP-44
API 605
AWWA Standards
ASA Standards
Custom Drawings

Flanges Sizes

Size: 1/2" – 60"
Pressure Class: 150 – 2500 LBS
Pressure Rating: PN6 – PN64
Faces: FF, RF & RTJ

Flange Dimensions Chart

Nominal Pipe Size	Outside Diameter (OD)	Min. Thickness (T)	RF Diameter (R)	No. of Bolt Holes	Bolt Hole Diameter	Bolt Circle (BC)
½″	88.90 mm	9.65 mm	35.05 mm	4	15.75 mm	60.45 mm
¾″	98.55 mm	11.18 mm	42.93 mm	4	15.75 mm	69.85 mm
1″	107.95 mm	12.70 mm	50.80 mm	4	15.75 mm	79.25 mm
1¼″	117.35 mm	14.22 mm	63.50 mm	4	15.75 mm	88.90 mm
1½″	127.00 mm	15.75 mm	73.15 mm	4	15.75 mm	98.55 mm
2″	152.40 mm	17.53 mm	91.95 mm	4	19.05 mm	120.65 mm
2½″	177.80 mm	20.57 mm	104.65 mm	4	19.05 mm	139.70 mm
3″	190.50 mm	22.35 mm	127.00 mm	4	19.05 mm	152.40 mm
3½″	215.90 mm	22.35 mm	139.70 mm	8	19.05 mm	177.80 mm
4″	228.60 mm	22.35 mm	157.23 mm	8	19.05 mm	190.50 mm
5″	254.00 mm	22.35 mm	185.67 mm	8	22.35 mm	215.90 mm
6″	279.40 mm	23.88 mm	215.90 mm	8	22.35 mm	241.30 mm
8″	342.90 mm	26.92 mm	269.75 mm	8	22.35 mm	298.45 mm
10″	406.40 mm	28.45 mm	323.85 mm	12	25.40 mm	361.95 mm
12″	482.60 mm	30.23 mm	381.00 mm	12	25.40 mm	431.80 mm
14″	533.40 mm	33.27 mm	412.75 mm	12	28.45 mm	476.25 mm
16″	596.90 mm	35.05 mm	469.90 mm	16	28.45 mm	539.75 mm
18″	635.00 mm	38.10 mm	533.40 mm	16	31.75 mm	577.85 mm
20″	698.50 mm	41.15 mm	584.20 mm	20	31.75 mm	635.00 mm
22″	749.30 mm	44.45 mm	641.35 mm	20	35.05 mm	692.15 mm
24″	812.80 mm	45.97 mm	692.15 mm	20	35.05 mm	749.30 mm

Chemical Composition

Carbon (C)

0.20% Max

Manganese (Mn)

1.50% Max

Silicon (Si)

0.75% Max

Phosphorus (P)

0.04% Max

Sulfur (S)

0.030% Max

Chromium (Cr)

23 – 30%

Molybdenum (Mo)

Not Specified

Nickel (Ni)

0.50% Max

Nitrogen (N)

0.10 – 0.25%

Iron (Fe)

Balance

Physical Properties

Grade Stainless Steel 446

UNS S44600

Werkstoff No. 1.4762 / 3

Density 7.5 g/cm³

Melting Point 1510 °C (2750 °F)

Standard ASTM A182 / ASME SA182

Size Range ½″ to 48″

Face Types FF, RF, RTJ

Tensile Strength

485 MPa

75,000 Psi

Yield Strength

275 MPa

40,000 Psi

Elongation

20 %

Minimum Elongation

Melting Point

1510 °C

2750 °F

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.