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4130 Steel Pipe Flange Supplier

Siddhagiri Metals and Tubes is a supplier of AISI 4130 Chromoly Flanges in forms SORF, BLRF, SWRF, LJRF, RTJ, Ring Type and Raised Flanges.
Other Names: Alloy Steel Flanges, 4130 Steel Pipe Flanges, Chromoly Flanges, SAE 4130 Flanges, AISI 4130 Flanges
Material: 4130 Steel Alloy
Brand: Siddhagiri Metals and Tubes
Manufacturer: Siddhagiri Metals and Tubes
Rating: 4.3/5 based on 90 customer reviews

4130 Steel Flanges • Alloy Steel Flanges • Chromoly 4130 Steel Flange Manufacturer

Siddhagiri Metals and Tubes is a supplier of AISI 4130 Flanges as per ASME / ANSI B16.5, ASME B16.47 / API 605, ASME B16.48 / API 590, MSS-SP-44, BS 3293, API 6A, DIN DN10 to DN3600. We are an ISO 9001:2015 certifed company with Alloy Steel Pipes exports in more than 70 countries gloablly. AISI 4130 is a versatile low carbon Chromium-Molybdenum Alloy with good strength and toughness.

A flange joint is a connection of pipes, where the connecting pieces have flanges by which the parts are bolted together. The principle of a flange is to apply a mechanical force by using bolts to preload the gasket until contact stress between flanges and gasket is sufficient to maintain a seal. Connection to the pipe is by welding or threading. To allow easy functionality and inter-changeability, these SAE 4130 Flanges are designed to have standardised dimensions which include ANSI, ASME, DIN, EN, BS, JIS. Chromoly Flanges have major applications in Ship-Building, Marine, Aerospace and other associated industries were piping systems are required.

Alloy Steel Slip On Flange — Alloy Slip-On Flanges is slightly larger than the outer diameter of the pipe it is to be used with. The pipe is slipped into the Flange prior to welding both inside and outside. We supply a wide range of slip-On Flanges in different dimensions and sizes.

Alloy Steel Blind Flange — Alloy Flange with no borehole are known as Blind Flange and used to close the end of the pipe. Blind Flanges are supplied as threaded or welded from class 150lb to 2500lb.

Alloy Steel Weld Neck Flange — Alloy Weld Neck Flanges are widely used in high-pressure piping systems and can be easily recognised by the long tapered hub. The size of the bore hole is usually equal to the size of the pipe.

Alloy Steel Socket Weld Flange — Initially developed for small high-pressure piping systems a Socket Weld Flange is similar to Slip On Flange. The flange is installed by welding around the hub of the flange.

Alloy Steel Threaded Flange — Threaded Flanges are used for special application where the flange can be assembled to the piping system by without welding. We specialise in all forms of threaded flanges and can supply it in multiple size range.

Alloy Steel Lap Joint Flange — Lap-Joint Flanges are similar to Slip-On flanges and are generally used with Lap-Joint Stubs. This type of flange is highly used where the piping systems are disassembled from time to time.

Siddhagiri Metals and Tubes supplies Alloy Steel Flanges in different sizes and pressure ratings. Our production stock of Alloy Steel Flanges includes size range from 1/2” to 24”, 26” to 60”, 1” to 24”, 1/2” to 24”, 12” to 60”, 26” to 48”, 21/16” to 30”, DN10 to DN3600. We have an inventory of flanges rating from Class 150 to 2500 Lbs, Class 300 to 2500 Lbs, Class 150 to 2500 Lbs, Class 150 to 900 Lbs, Class 150 to 600 Lbs, 2000 Psi to 20000 Psi, PN6 to PN 160. Our flanges conform to international dimension standards such as ASME / ANSI B16.5, ASME B16.47 / API 605, ASME / ANSI B16.36, ASME B16.48 / API 590, MSS-SP-44, BS 3293, API 6A and DIN. We stock various types of flanges which include Slip On Flange, Blind Flange, Weld Neck Flange, Socket Weld Flange, Threaded Flange, Lap Joint Flange.

We have an extensive inventory of multiple stainless steel flanges and alloy flanges to compliment our pipe products. Most of our high quality, flanges and gasket kits are ready to ship upon request. Speak to one of our specialists and find out which flanges to meet your flange and piping specifications. We have partnered with the best flange brands around the world to meet your flange requirements. We also stock flanges from Ulma — Spain, Metalfar — Italy, Mellesi — Italy, Massoti — Italy. Moreover, we are SAUDI ARAMCO approved supplier of flanges and provide all documents including Mill Certificate along with the shipment.

Our primary export destinations include Russia, Australia, UK, Germany, US, Saudi Arabia, Qatar, Jordan, South Africa, Thailand, Canada, Mexico, Brazil and much more.

  • Flange Specification: WNR 1.7218, DIN 1.7218, SCM420, SCM430
  • Dimension Standard: ASME / ANSI B16.5, ASME B16.47 / API 605, ASME B16.48 / API 590, MSS-SP-44, BS 3293, API 6A, DIN DN10 to DN3600
  • Size Range: 1/2” to 24”
  • Rating: Class 150 to 2500 Flanges | PN 6, PN 10, PN 16, PN 25, PN 40, PN 64 upto PN 160
  • Type of Flanges: 4130 Steel Weld-Neck Flanges, 4130 Steel Socket-Weld Flange, 4130 Steel Lap-Joint Flange, 4130 Steel Orifice Flange, 4130 Steel Tongue-Grove Flange, 4130 Steel Blind Flange, 4130 Steel Threaded Flange, 4130 Steel Slip-On Flange, 4130 Steel Spectacle Flange, 4130 Steel Plate Flanges
  • Form: SORF, BLRF, WNRF, SWRF, LJRF, LWNRF, RTJ, Flat Face, Ring Type, Raised Face
  • Origin: Indian Origin, European Origin, Japanese Origin
  • Testing and Documents: Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, Destructive Test Report, Non Destructive Test Reports, PMI Test Reports, Visual Inspection Reports, Third Party Inspection Reports, NABL Approved Lab Reports
  • Packing: Packed in Wooden Boxes, Bubble wraps, Steel Strips Bundled, or as per Customers Requests

4130 Steel Alloy Flanges in Stock

Dimension Standard Size Range Rating
ASME / ANSI B16.5 Flanges 1/2” to 24” Class 150 to 2500 Lbs
ASME B16.47 / API 605 Flanges 26” to 60” -
ASME / ANSI B16.36 Flanges 1” to 24” Class 300 to 2500 Lbs
ASME B16.48 / API 590 Flanges 1/2” to 24” Class 150 to 2500 Lbs
MSS-SP-44 Flanges 12” to 60” Class 150 to 900 Lbs
BS 3293 Flanges 26” to 48” Class 150 to 600 Lbs
API 6A Flanges 2 1/16” to 30” 2000 Psi to 20000 Psi
DIN Flanges DN10 to DN3600 PN6 to PN 160

Forms of 4130 Chromoly Flanges in Stock

In Stock Alloy Weld Neck Flanges

Weld Neck Flange

4130 Steel Weld Neck Flange available from class 150 to 2500

In Stock 4130 Steel Tongue Groove Flanges

Tongue Groove Flange

4130 Steel Tongue Groove Flanges available from PN6 to PN 160 ratings

In Stock Alloy Steel Threaded Flanges with ASME B16.5 and ANSI B16.5

Threaded Flange

Chromoly 4130 Threaded Flange available in ASME / ANSI B16.5 standards

In Stock 4130 Steel Spectacle Flanges

Spectacle Flange

SAE 4130 4130 Steel Spectacle Flange

In Stock Alloy Steel Alloy Socket Weld Flanges

Socket Weld Flange

SAE 4130 Socket Weld Flange

In Stock 4130 Steel Slip On Flanges

Slip On Flange

4130 Steel Slip On Flange SAE 4130

In Stock Alloy Steel Orifice Flanges

Orifice Flange

4130 Steel Orifice Flange available from PN6 to PN 160 ratings

In Stock 4130 Steel Lap Joint Flanges with ASME B16.36

Lap Joint Flange

4130 Chromoly Lap Joint Flange available in ASME B16.36 and ANSI B16.36 SAE 4130 Flanges

In Stock Alloy Steel Blind Flanges

Blind Flange

SAE 4130 4130 Steel Blind Flange available from class 150 to 2500LB

  • Chemical Properties
  • Mechanical Properties
  • Physical Properties
  • C Si Mn P S Cr Mo Fe
    MIN 0.280 0.150 0.400 0.800 0.150 97.030
    MAX 0.330 0.300 0.600 0.035 0.040 1.100 0.250 98.220
  • Yield Strength
    0.2% Proof
    Tensile strength
    (% in 50mm)
    MIN 460 560 21.50  
    MAX       95
  • Properties Metric Imperial
    Density 7.85 g/cm3 0.284 lb/in³
    Melting point 1432°C 2610°F

Properties of 4130 Steel alloy

4130 Steel Cold Forming

Chromoly 4130 steel can be cold worked using conventional methods.

4130 Steel Hot Forming

Hot working of Chromoly 4130 steel steel can be done at 816 to 1093°C (1500 to 2000°F).

4130 Steel Machining

Chromoly 4130 steel can be easily machined using standard techniques. Whereas, annealing is required for complex forms.

4130 Steel Welding

Welding of Chromoly 4130 steel can be performed by all standard methods. Although, post-weld stress relief heat treatment is required sometimes.

4130 Steel Heat Treatment

Chromoly 4130 steel should be heated at 871°C (1600°F) and then quenched in oil. The steel is usually heat-treated at temperatures ranging from 899 to 927°C (1650 to 1700°F).

Services We Offer


Documentation is a very important part of the products we supply, and we work continuously to enhance the efficiency of the document-handling process without compromising quality of the product. Documents provided along with the shipment include Certificate of Origin, Material Test Certificate as per EN 10204 3.1 and 10204 3.2, NACE MR10103 and NACE MR0175 certified Test Certificates.

Quality Assurance

Alloy Steel Flanges and Fittings are manufactured and controlled to international standards such as ASTM, ASME, BS, MSS, EN, DIN or WERKSTOFFE. Our products undergo stringent quality tests before they are dispatched.

Material Testing

PMI Testing, Ultrasonic Test, Mechanical Testing, Spectro Tests for Chemical Analysis of the grade, Flaring Test, IGC, etc. are some of the tests conducted at our facility. We welcome stage wise inspection from any of your representative or third party inspection agencies.

Packing and Delivery

The product is wrapped and packed in wooden crates or carton boxes. Our primary goal is to deliver quality products in time, no matter where the client is located.

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