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ANSI B16.5 · Class 150–2500 Critical Service
Forged Flanges
M.S. Forged Steel Flanges Manufacturer & Supplier – Mumbai, India · Since 1999
ANSI B16.5 CertifiedClass 150–2500Superior StrengthDirect ManufacturerPAN India Supply
M.S. Forged Flanges are manufactured by the hot forging process — where heated steel billets are compressed under high pressure between dies. This forging process refines and aligns the grain structure of the steel, producing a flange with superior tensile strength, toughness and fatigue resistance compared to flanges cut from plate or made by casting. Manufactured at our Darukhana, Mumbai factory to ANSI B16.5 standard. Available in sizes 15mm NB to 600mm NB, Class 150 to Class 2500. The standard choice for critical service in oil refineries, power plants, petrochemical plants and high-pressure pipelines.
Quick Specifications
StandardANSI B16.5 / ASTM A105
Size Range15mm NB – 600mm NB
Pressure ClassClass 150, 300, 600, 900, 1500, 2500
Manufacturing ProcessHot Forging + CNC Precision Machining
Face TypesRaised Face (RF) / Ring Joint (RTJ)
Material GradeIS:2062 / ASTM A105 Mild Steel
Lead Time7–15 Days
SupplyPAN India | Darukhana, Mumbai
Class 2500Max Rating
600mmMax NB Size
SuperiorStrength vs Cast
What Are Forged Flanges?
Forged Flanges are produced by the hot forging process: a heated steel billet is placed between shaped dies and compressed under thousands of tonnes of pressure. This closes internal voids, refines grain structure, eliminates segregation and aligns the metallic grain flow with the shape of the forging — resulting in a flange with mechanical properties significantly superior to an equivalent cast or plate-cut flange.
Key property advantages of Forged vs Plate-Cut Flanges:
- Higher tensile strength — refined grain structure under compressive forging
- Better toughness — superior impact resistance, especially at low temperatures
- Superior fatigue resistance — continuous grain flow without stress concentrations
- No internal porosity or voids — forging closes any internal defects
- Consistent mechanical properties — uniform properties throughout the forging
When Are Forged Flanges Mandatory?
Project specifications for oil & gas, power and petrochemical projects typically mandate forged flanges (e.g., "flanges to ASTM A105 Grade I or II" or "forged flanges per ANSI B16.5") for Class 300 and above. They are also required in ASME/PED code-compliant pressure systems. Always consult your project specification before ordering.
Why Choose I.S. Engineering Co.?
25+ Years Experience
Manufacturing Forged Flanges in Mumbai since 1999. Trusted by 500+ clients across India.
Factory-Direct Pricing
No middlemen. Buy direct from the manufacturer at the most competitive prices in Mumbai.
100% Quality Inspected
Every Forged Flanges undergoes dimensional and material inspection before dispatch from our Mumbai factory.
PAN India Delivery
Supplying to Mumbai, Pune, Delhi, Bangalore, Chennai, Hyderabad, Ahmedabad and all major cities across India.
Forged Flanges – Dimensional Specifications
| Property | Plate-Cut Flanges | Forged Flanges |
|---|---|---|
| Manufacturing | Cut from rolled plate | Hot forged from billet |
| Grain Structure | Disrupted at cut edges | Continuous, aligned grain flow |
| Tensile Strength | Standard IS:2062 | Higher (forging effect) |
| Fatigue Resistance | Lower | Superior |
| Internal Defects | Possible inclusions | Forging closes voids |
| Pressure Class | PN6–PN40 / Class 150–300 | All classes up to Class 2500 |
| Critical Service | Not recommended | Standard specification |
| Cost | Lower | Higher (superior material) |
* Dimensions are indicative. Custom sizes available on request. Contact I.S. Engineering Co. at +91 83558 15350 for specific sizes, tolerances and full specification sheets.
Forged Flanges – Industries & Applications
Oil Refineries
Standard specification for all process piping in crude oil, gas and refined products service. Class 300–900 for process units; Class 1500–2500 for high-pressure wellhead and injection systems.
Power Plants
Used in steam generation and distribution systems, boiler connections and turbine inlet piping. Class 600–900 for high-pressure high-temperature steam service in thermal power stations.
Petrochemical Plants
Used in cracking units, process heaters and high-pressure reactors. Forged flanges provide the fatigue resistance needed for cyclic pressure and thermal cycling in petrochemical processes.
Gas Pipelines
Used in high-pressure gas transmission and distribution pipelines. Class 600–900 forged flanges at valve stations, meter stations and pig launchers/receivers.
ASME Code Systems
Required in ASME B31.1 (Power Piping) and ASME B31.3 (Process Piping) code systems where the material specification requires ASTM A105 forged carbon steel for Class 300 and above.
Forged Flanges – Frequently Asked Questions
What are Forged Flanges and why are they stronger?
+Forged Flanges are manufactured by the hot forging process — compressing heated steel billets under high pressure between dies. This closes internal voids, refines and aligns the grain structure, and eliminates segregation — producing a flange with higher tensile strength, better fatigue resistance and superior toughness compared to equivalent plate-cut or cast flanges.
What is the difference between Forged Flanges and plate-cut Flanges?
+Forged Flanges: manufactured by hot forging of steel billets — superior grain structure, higher strength, better fatigue resistance, no internal porosity, suitable for all pressure classes including Class 2500. Plate-cut Flanges: manufactured by cutting from rolled plate — grain flow is disrupted at cut edges, lower fatigue resistance, suitable for lower pressure classes (PN6–PN40 / Class 150–300). Forged flanges cost more but provide significantly better mechanical performance.
What pressure classes are available for Forged Flanges?
+Forged Flanges are available in all ANSI B16.5 pressure classes: Class 150, 300, 600, 900, 1500 and 2500. The applicable pressure class at your operating temperature can be determined from ANSI B16.5 pressure-temperature tables. Contact our technical team for guidance on class selection for your specific application.
Are your Forged Flanges ASTM A105 equivalent?
+Yes. The IS:2062 Grade E250 Mild Steel used in our Forged Flanges is equivalent in mechanical properties to ASTM A105 forged carbon steel — with similar tensile strength (410–530 N/mm²), yield strength (≥ 250 N/mm²) and chemical composition. For projects requiring actual ASTM A105 material certification, please specify this at the time of enquiry so we can arrange accordingly.
How do I order Forged Flanges?
+To order Forged Flanges, call +91 83558 15350 or email info.isengineering.co@gmail.com. Specify: NB size, pressure class (Class 150/300/600/900/1500/2500), face type (RF or RTJ), flange type (Welding Neck, Blind, Slip-On), quantity and delivery location. Lead time is typically 7–15 working days. Material Test Certificates available on request.
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