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Alloy Steel High Pressure Flanges Manufacturer and Supplier in India
Alloy Steel High Pressure Flanges are intended to provide leak-proof and secure connections within pipelines under high operating pressure and high temperature environments. Made in chrome-moly alloy steel grades like ASTM A182 F11, F22, and F91, these flanges are able to provide strength and temperature resistance in the challenging industrial service. These are commonly found in thermal power plants, refineries, petrochemical plants and high pressure steam lines. Selection is based on the grade of material, pressure class, operating temperature, face dimensions and flange type (raised faces or ring-type joint). Solitaire Overseas is a reliable manufacturer and supplier of alloy steel high pressure flange in India, which provide engineered products for demanding industrial applications and project requirements across the globe.
Technical Data
Specifications of Alloy Steel High Pressure Flanges
| Feature / Attribute | Technical Specification |
|---|---|
|
Primary Material Grades |
ASTM A182 F5, F9, F11 (Class 2), F12 (Class 2), F22 (Class 3), F91 |
|
Nominal Size Range |
NPS 1/2" to 24" (ASME B16.5); NPS 26" to 60" (ASME B16.47 Series A & B); API 6A sizes as per the applicable product specification level, stated at enquiry |
|
Pressure Class Ratings |
Class 600, Class 900, Class 1500, Class 2500; API 6A rated working pressures from 2,000 to 20,000 psi |
|
Facing Configurations |
Ring-Type Joint (RTJ) Grooved (R, RX, BX), Raised Face (RF) 125250 \ mu in AARH |
|
Flange Types |
Weld Neck (WN), Blind (BL), Socket Weld (SW - up to NPS 2 max) |
|
Governing Standards |
ASME B16.5, ASME B16.47, API 6A, MSS SP-44, NACE MR0175 / ISO 15156 |
|
Forging & Processing |
Forged execution (ASTM A182); Normalized & Tempered / Quenched & Tempered |
|
Non-Destructive Testing |
Ultrasonic Testing (UT), Magnetic Particle (MPI), Liquid Penetrant (LPI), Radiographic (RT) |
|
Material Certification |
EN 10204 3.1 Material Test Reports standard; EN 10204 3.2 with TPA upon request |
Chemical Compositions of Alloy Steel High Pressure Flanges
| Grade | C (max) | Mn | Si | Cr | Mo | UNS No. |
|---|---|---|---|---|---|---|
|
A182 F5 |
0.15 |
0.30 to 0.60 |
0.50 max |
4.00 to 6.00 |
0.44 to 0.65 |
K41545 |
|
A182 F9 |
0.15 |
0.30 to 0.60 |
0.50 to 1.00 |
8.00 to 10.00 |
0.90 to 1.10 |
K90941 |
|
A182 F11 Cl.2 |
0.05 to 0.15 |
0.30 to 0.60 |
0.50 to 1.00 |
1.00 to 1.50 |
0.44 to 0.65 |
K11597 |
|
A182 F12 Cl.2 |
0.05 to 0.15 |
0.30 to 0.60 |
0.50 max |
0.80 to 1.25 |
0.44 to 0.65 |
K11562 |
|
A182 F22 Cl.3 |
0.05 to 0.15 |
0.30 to 0.60 |
0.50 max |
2.00 to 2.50 |
0.87 to 1.13 |
K21590 |
|
A182 F91 |
0.07 to 0.14 |
0.30 to 0.60 |
0.20 to 0.50 |
8.00 to 9.50 |
0.85 to 1.05 |
K90901 |
Mechanical Properties of Alloy Steel High Pressure Flanges
| Grade | Tensile Strength (MPa min) | Yield Strength (MPa min) | Elongation (% min) | Hardness (BHN max) |
|---|---|---|---|---|
|
A182 F5 |
485 |
275 |
20 |
187 |
|
A182 F9 |
620 |
415 |
18 |
207 |
|
A182 F11 Cl.2 |
515 |
310 |
20 |
207 |
|
A182 F12 Cl.2 |
485 |
275 |
20 |
163 |
|
A182 F22 Cl.3 |
515 |
310 |
20 |
163 |
|
A182 F91 |
585 |
415 |
20 |
248 |
Pressure Rating Chart of Alloy Steel High Pressure Flanges
| Temperature (°C / °F) | Class 600 | Class 900 | Class 1500 | Class 2500 |
|---|---|---|---|---|
|
-29 to 38 C (-20 to 100 F) |
103.4 bar (1500 psig) |
155.1 bar (2250 psig) |
258.6 bar (3750 psig) |
430.9 bar (6250 psig) |
|
200 C (392 F) |
93.1 bar (1350 psig) |
139.6 bar (2025 psig) |
232.7 bar (3375 psig) |
387.8 bar (5625 psig) |
|
400 C (752 F) |
74.5 bar (1080 psig) |
111.7 bar (1620 psig) |
186.2 bar (2700 psig) |
310.3 bar (4500 psig) |
|
500 C (932 F) |
53.1 bar (770 psig) |
79.6 bar (1155 psig) |
132.7 bar (1925 psig) |
221.2 bar (3210 psig) |
|
550 C (1022 F) |
28.3 bar (410 psig) |
42.4 bar (615 psig) |
70.7 bar (1025 psig) |
117.8 bar (1710 psig) |
Dimensional and Weight Tables of Alloy Steel High Pressure Class 900 Flanges
| Size (NPS) | Flange OD (mm/in) | Flange Thickness (mm/in) | Bolt Circle Dia (mm/in) | Bolt Hole Qty | Bolt Size (in) | WN Approx Weight (kg/lbs) | BL Approx Weight (kg/lbs) |
|---|---|---|---|---|---|---|---|
|
3" |
240mm/9.50" |
38.1mm/1.50" |
190.5mm/7.50" |
8 |
7/8" |
15.5kg/34.2lbs |
14.1kg/31.1lbs |
|
4" |
292mm/11.50" |
44.5mm/1.75" |
235.0mm/9.25" |
8 |
1-1/8" |
25.0kg/55.1lbs |
23.6kg/52.0lbs |
|
6" |
381mm/15.00" |
55.6mm/2.19" |
317.5mm/12.50" |
12 |
1-1/8" |
54.0kg/119.0lbs |
49.5kg/109.1lbs |
|
8" |
470mm/18.50" |
63.5mm/2.50" |
393.7mm/15.50" |
12 |
1-3/8" |
91.0kg/200.6lbs |
86.0kg/189.6lbs |
|
10" |
546mm/21.50" |
70.0mm/2.75" |
469.9mm/18.50" |
16 |
1-3/8" |
136.0kg/299.8lbs |
128.0kg/282.2lbs |
|
12" |
610mm/24.00" |
79.4mm/3.12" |
533.4mm/21.00" |
20 |
1-3/8" |
191.0kg/421.1lbs |
181.0kg/399.0lbs |
Class 1500 Flanges of Alloy Steel High Pressure Flanges
| Size (NPS) | Flange OD (mm/in) | Flange Thickness (mm/in) | Bolt Circle Dia (mm/in) | Bolt Hole Qty | Bolt Size (in) | WN Approx Weight (kg/lbs) | BL Approx Weight (kg/lbs) |
|---|---|---|---|---|---|---|---|
|
3" |
267mm/10.50" |
47.8mm/1.88" |
203.2mm/8.00" |
8 |
1-1/8" |
23.5kg/51.8lbs |
20.8kg/45.9lbs |
|
4" |
311mm/12.25" |
54.0mm/2.12" |
241.3mm/9.50" |
8 |
1-1/4" |
37.0kg/81.6lbs |
32.2kg/71.0lbs |
|
6" |
394mm/15.50" |
82.6mm/3.25" |
317.5mm/12.50" |
12 |
1-3/8" |
83.0kg/183.0lbs |
78.0kg/172.0lbs |
|
8" |
483mm/19.00" |
91.9mm/3.62" |
393.7mm/15.50" |
12 |
1-5/8" |
145.0kg/319.7lbs |
131.0kg/288.8lbs |
|
10" |
584mm/23.00" |
108.0mm/4.25" |
482.6mm/19.00" |
12 |
1-7/8" |
243.0kg/535.7lbs |
226.0kg/498.2lbs |
|
12" |
673mm/26.50" |
124.0mm/4.88" |
552.4mm/21.75" |
16 |
2" |
363.0kg/800.3lbs |
348.0kg/767.2lbs |
Class 2500 Flanges (ASME B16.5) Alloy Steel High Pressure Flanges
| Size (NPS) | Flange OD (mm/in) | Flange Thickness (mm/in) | Bolt Circle Dia (mm/in) | Bolt Hole Qty | Bolt Size (in) | WN Approx Weight (kg/lbs) | BL Approx Weight (kg/lbs) |
|---|---|---|---|---|---|---|---|
|
3" |
305mm/12.00" |
66.7mm/2.62" |
228.6mm/9.00" |
8 |
1-1/4" |
42.0kg/92.6lbs |
38.0kg/83.8lbs |
|
4" |
356mm/14.00" |
76.2mm/3.00" |
273.1mm/10.75" |
8 |
1-1/2" |
67.0kg/147.7lbs |
59.0kg/130.1lbs |
|
6" |
483mm/19.00" |
108.0mm/4.25" |
368.3mm/14.50" |
8 |
2" |
162.0kg/357.1lbs |
153.0kg/337.3lbs |
|
8" |
552mm/21.75" |
127.0mm/5.00" |
438.2mm/17.25" |
12 |
2" |
255.0kg/562.2lbs |
238.0kg/524.7lbs |
|
10" |
673mm/26.50" |
165.0mm/6.50" |
540.0mm/21.25" |
12 |
2-1/2" |
490.0kg/1080.3lbs |
462.0kg/1018.5lbs |
|
12" |
762mm/30.00" |
184.0mm/7.25" |
619.1mm/24.38" |
12 |
2-3/4" |
725.0kg/1598.3lbs |
658.0kg/1450.6lbs |
Types of Alloy Steel High Pressure Flanges
Low Alloy Steel Blind Flange
Intermediate Alloy Steel WNRF Flange
IBR Alloy Steel SORF flange
IBR Alloy Steel Plate Flange
High Temp Alloy Steel Threaded Flange
High Strength Low Alloy BLRF Flange
Ferritic Alloy Steel Forged Flange
Ferritic Alloy Orifice Flange
Chromoly Steel Alloy LWNRF flange
Chromium Alloy Steel Socket Weld Flange
Chromium Alloy Steel RTJ Flange
Chromium Alloy Steel Raised Face Flange
Chrome Molybdenum Alloy Steel Weld Neck Flange
AS Slip On Flange
Alloy Steel Reducing Flange
Alloy Steel Lap Joint Flange
Applications and Industrial Uses of Alloy Steel High Pressure Flanges
- High-Pressure Steam Lines in Thermal Power Plants
- Boiler Main Steam and Reheat Piping
- Oil Refinery Hydrocracking Units
- Hydroprocessing and Catalytic Reforming Systems
- High-Pressure Natural Gas Processing Lines
- Petrochemical Reactor Piping Systems
- High-Pressure Feedwater Piping in Power Stations
- Hydrogen Service Piping in Refining Plants
Frequently Asked Questions
Alloy steel high pressure flanges are pipe connection components designed to withstand high pressures, elevated temperatures, and demanding industrial conditions.
They are used in power plants, oil refineries, petrochemical facilities, boiler piping, and high-pressure steam systems.
ASTM A182 covers forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves for high-temperature service.
These are ASME pressure classes, not pressures in psi. At ambient temperature in alloy steel, Class 900 is rated around 2,250 psig, Class 1500 around 3,750 psig and Class 2500 around 6,250 psig. Every rating falls as temperature rises, and the applicable figure depends on the grade's ASME B16.5 material group.
Yes. Grades such as ASTM A182 F11, F22, and F91 are used in high-temperature applications, depending on the operating conditions and design requirements.
PWHT may be required depending on the material grade, thickness, welding procedure, service conditions, and applicable construction code.