Forged Alloy Steel Flanges: B462 N08020 Weld flange for Petroleum Industry
1. Introduction
Forged alloy steel flanges under specification ASTM B462 UNS N08020 (Alloy 20) are critical components in petroleum and petrochemical pipeline systems. These flanges combine high-temperature resistance, exceptional corrosion resilience, and structural integrity, making them ideal for sour gas, acidic, and high-pressure environments .The Weldoflange design (integrated weld neck) ensures seamless integration with pipelines, reducing stress concentrations and enhancing durability in demanding oil and gas operations
2. Material Properties
UNS N08020 Composition:
Nickel (32–38%), Chromium (19–21%), Molybdenum (2–3%), and Copper (3–4%)
Enhanced resistance to sulfuric acid, chloride-induced stress corrosion cracking (SCC), and pitting in H₂S-rich environments .
Mechanical Strength:
Tensile strength: ≥550 MPa; Yield strength: ≥240 MPa (at room temperature) .
Suitable for temperatures up to 600°C (1,112°F) without degradation .
3. Design and Manufacturing Standards
Weldoflange Structure:
Weld Neck Design: Integrates a tapered hub to distribute mechanical stress evenly, minimizing fatigue failure in high-vibration pipelines .
Raised Face (RF): Machined surface ensures reliable gasket sealing under pressures up to CL300 (300 psi) .
Compliance:
ASTM B462: Specifies chemical composition, heat treatment, and mechanical testing for UNS N08020 alloy .
ASME B16.5/B16.9: Governs dimensions, pressure ratings, and tolerances for petroleum flanges .
4. Manufacturing Process
Forging: Hot-die forging refines grain structure, enhancing impact toughness and resistance to brittle fracture .
Heat Treatment: Solution annealing at 1,040–1,100°C followed by rapid quenching optimizes corrosion resistance and mechanical properties .
Surface Finish: Polished or electro-passivated surfaces meet NACE MR0175 standards for sour service applications .
5. Applications in Petroleum Industry
Offshore Platforms: Resists seawater corrosion and hydrogen embrittlement in subsea pipelines .
Refinery Piping: Handles sulfuric acid alkylation units, crude oil distillation columns, and sulfur recovery systems .
High-Pressure Gas Transmission: CL300-rated flanges ensure leak-free connections in natural gas compression stations .
6. Comparative Advantages
Superior to Carbon Steel: 3–5x longer service life in acidic and H₂S-laden environments .
Cost Efficiency: Reduced maintenance and replacement frequency due to corrosion resilience .
Safety: Weldoflange design minimizes weld defects, critical for explosive hydrocarbon environments .
7. Procurement and Customization
Sizes: Available in 1/2″ to 48″ diameters, with custom bolt-hole patterns and thicknesses .
Certifications: Mill test reports (MTRs) and 3.1 Material Certificates ensure traceability and compliance .
Packaging: Wooden crates or pallets for bulk orders, with lead times of 8–12 weeks .
Conclusion
ASTM B462 N08020 forged alloy steel Weldoflanges are indispensable in modern petroleum infrastructure, offering unmatched performance in corrosive and high-pressure environments. Their adherence to international standards, robust material science, and adaptable manufacturing processes make them a cornerstone of safe and efficient hydrocarbon transportation.
References
ASTM A182/A18M standards for alloy steel flanges.
ASME B16.9 Weldoflange design and applications.
SAMSS-011 specifications for forged alloy flanges.
Nickel alloy corrosion resistance in petroleum environments.
ASME/ANSI B16.5 stainless steel RF nipo-flange
Nipoflange is used in the pipe industry like a weldolet or a nipolet for a 90° branch connection.
A Nipoflange is a combination of weldolet, nipolet and flange.
Two different pipe branch connections
On the run pipe side a nipoflange is designed like a weldolet. That means the branch connection
on the run pipe side is a welding connection. On the other side there it has a flange connection.
The flange connection can be designed according to customers requirements (acc. To DIN or ANSI).
Product Description
Product Name Weldo Flange
Standard ASME/ANSI B16.5/16.36/16.47A/16.47B/B16.48, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092
Type Special Flange: According to the drawing Picture
Materials
Copper Nickel Alloy: ASTM B466 UNS C70600, ASTM B466 UNS C71500, CUNI90/10, CUNI70/30
Nickel Alloy: ASTM/ASME S/B366 UNS N08020, N04400, N06600, N06625, N08800, N08810, N08825, N10276,N10665,N10675
Super Stainless Steel: ASTM/ASME S/A182 F44, F904L, F317L, UNS S32750, UNS S32760
Stainless steel: ASTM/ASME S/A182 F304, F304L, F304H, F316, F316L, F321, F321H, F347H
Duplex Steel: ASTM A182 F51, F53, F55, UNS S31803, UNS S31254
Alloy Steel: ASTM/ASME S/ A182 F11, F12, F22, F5, F9, F91
Carbon Steel: ASTM/ASME S/A105, ASTM/ASME S/A350 LF2, ASTM/ASME S/A694/A694M, F42, F52, F56, F60, F65, F70….
ASTM A516 GRADE 70
Dimension (150#,300#,600#): DN15-DN1500
900# : DN15-DN1000
1500#: DN15-DN600
2500#:D N15-DN300
Test Chemical Component Analysis, Mechanical Properties, Metallurgical Analysis, Impact Testing, Hardness testing , Ferrite Testing, Inter granular corrosion testing, X-ray Inspection (RT), PMI, PT, UT, HIC & SSC test, etc. or as your requirement
Certificates API, ISO, SGS, BV, CE, PED, KOC, CCRC, PDO, CH2M HILL and etc.
Advantages
1. Abundant stock and prompt delivery
2. Reasonable for whole packages and processes.
3. 15 years’ QC team service & sales management API& ASTM trained engineers.
4. More than 150 customers spread worldwide. (Petrofac, G.S Engineer, Fluor, Hyundai Heavy industry, Kuwait National Oil, Petrobras, PDVSA, Petrol Ecuador, SHELL, etc.)
Alloy Ni C Mn Fe S Si Cu Cr Al Ti Nb Mo
Nickel 200 99.5 0.08 0.2 0.2 0.005 0.2 0.1 — — — — —
Nickel 200 99.5 0.01 0.2 0.2 0.005 0.2 0.1 — — — — —
Monel 400 66.5 0.2 1 1.2 0.01 0.2 31.5 — — — — —
Monel 401 42.5 0.05 1.6 0.4 0.008 0.1
— — — — —
Monel K500 66.5 0.1 0.8 1 0.005 0.2 29.5 — 2.7 0.5 — —
Inconel 600 76 0.08 0.5 8 0.006 0.2 0.2 15.5 — — — —
Inconel 601 60.5 0.05 0.5 14.1 0.007 0.2 0.5 23 1.4 — — —
Inconel 718 52.5 0.04 0.2 18.5 0.008 0.2 0.2 19 0.5 0.9 5.1 3
Inconel X-715 73 0.04 0.5 7 0.005 0.2 0.2 15.5 0.7 2.5 1 —
Incoloy 800 32.5 0.05 0.8 46 0.008 0.5 0.4 21 0.4 0.4 — —
Incoloy 803 32.0-
37.0 0.06-
0.10 ≤1.5
≤0.015 ≤1.0 ≤0.75 25.0-
29.0 0.15-
0.60 0.15-
0.6 — —
Incoloy 825 42 0.03 0.5 30.4 0.02 0.2 2.2 21.5 0.1 0.9 — 3
Other Products
Nickel Alloys WNRF Flanges : Monel 400 & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22,C276
Copper Alloys WNRF Flanges: Copper, Brass & Gunmetal
Incoloy Alloy Steel Flange : ASTM AB564 ,NO8800/ Alloy800, NO8810/ Alloy 800H, NO8811/Alloy 800HT
Hastelloy Steel Flange: ASTM AB564 , C276/ NO10276 , Monel Alloy 400 /NO4400, K500/NO5500,
APPLICATIONS
Applications include chemical processing, pollution control, oil and gas
recovery, acid production, pickling operations, nuclear fuel reprocessing, and handling of radioactive wastes.
Packaging & Shipping
Packaging: In wooded cases , pallets or according to clients’ requirements
Shipping: Tianjin port, Shanghai port and the other main ports in China
Forged Alloy Steel Flanges Alloy Steel Weldoflange B462 N08020 For Petroleum 0
Tag:forged steel flanges,spectacle blind flange,reducing weld neck flange