ASME B16.5 Class150 Forged Steel Socket Weld Flange A105 RF
1. Product Description
Forged steel flanges are manufactured from killed steel grades through a controlled hot‑forging process that includes precise heating (1100°C–1250°C), multi‑stage deformation, and post‑forge cooling. The process ensures a minimum forging reduction ratio of 3:1, eliminating internal porosity and segregation. The resulting microstructure consists of fine, equiaxed grains with an ASTM grain size number of 5 or finer, verified per ASTM E112. Heat treatment (normalizing, quenching‑and‑tempering, or solution annealing) is applied according to material grade to achieve the required mechanical properties and hardness limits. All production complies with ASME Section II, ASME B16.5/B16.47, and applicable EN, DIN, JIS, and GB specifications. Positive Material Identification (PMI) is performed on 100% of finished pieces, and each flange is individually marked with heat number, material designation, size, class, and manufacturer's traceable code.
2. Product Applications
Forged steel flanges are employed across a broad spectrum of industrial piping systems where joint integrity and safety are critical.
In the oil and gas sector, they are used for wellhead connections, gathering lines, transmission pipelines, and refinery process units, handling crude oil, natural gas, and refined products under high pressure and variable temperatures.
In chemical and petrochemical plants, these flanges connect reactors, heat exchangers, distillation columns, and storage tank nozzles, conveying acids, caustics, solvents, and other aggressive chemicals.
Power generation facilities, including thermal, nuclear, and combined‑cycle plants, use forged flanges in boiler feedwater circuits, main steam lines, condenser systems, and auxiliary piping, with alloy steel grades selected for creep resistance at elevated temperatures.
Shipbuilding and offshore platforms rely on these flanges for deck piping, ballast systems, firewater lines, and subsea manifolds, where corrosion resistance and fatigue strength are essential.
Water and wastewater treatment plants employ them for pump connections, filtration units, and desalination vessels, handling raw water, brine, and chemical dosing streams.
In pharmaceutical, biotechnology, and food processing, sanitary‑grade forged flanges with smooth finishes and stainless steel materials ensure cleanability and prevent product contamination.
Additionally, they are specified for cryogenic services (LNG, liquid nitrogen, ethylene) and for high‑purity gas distribution in semiconductor manufacturing, using impact‑tested low‑temperature grades.
3. Product Advantages
Compared to cast steel flanges or plate‑type flanges, forged steel flanges offer the following proven benefits:
Higher tensile and yield strength due to refined grain structure and elimination of internal defects, providing greater safety margins under design pressure.
Superior toughness and resistance to brittle fracture, especially at low temperatures, verified by Charpy V‑notch impact testing per material specification.
Excellent resistance to hydrogen‑induced cracking and sulfide stress corrosion when manufactured with controlled chemistry and hardness limits per NACE MR0175.
Precision‑machined sealing faces with surface roughness Ra ≤ 3.2 µm ensure consistent gasket compression and leak‑tight performance across the entire pressure‑temperature range.
Dimensional accuracy to ASME B16.5 tolerances guarantees interchangeability with mating flanges from any qualified manufacturer, simplifying field installation and replacement.
Complete traceability from raw material to finished product, with mill test certificates, heat treatment records, and nondestructive examination reports provided for every order.
Lower life‑cycle cost, as extended service life and reduced maintenance intervals offset the higher initial purchase price compared to inferior alternatives.
4.Key Technical Parameters
| Parameter |
Specification / Range |
| Design Standards |
ASME B16.5 (NPS ½–24), ASME B16.47 Series A/B (NPS 26–120), EN 1092-1, DIN, JIS, GB/T 9112 |
| Nominal Pipe Size |
NPS ½″ to 120″ (DN 15 to DN 3000) |
| Pressure Classes |
Class 150, 300, 400, 600, 900, 1500, 2500 (equiv. PN 20, 50, 110, 150, 260, 420) |
| Temperature Capability |
–196°C to +600°C, with pressure derating per ASME B16.5 tables |
| Carbon Steel Grades |
ASTM A105 (general), A105N (normalized), A350 LF2 (low-temp, –46°C impact) |
| Alloy Steel Grades |
ASTM A182 F11, F22 (450–550°C), F91 (up to 600°C) |
| Stainless Steel Grades |
ASTM A182 F304, F304L, F316, F316L (solution annealed, corrosion-resistant) |
| Flange Types |
Weld Neck (WN), Slip-On (SO), Blind (BL), Socket Weld (SW), Threaded (THRD), Lap Joint (LJ), Orifice, Reducing |
| Facing Styles |
Raised Face (RF) – standard; Flat Face (FF); Ring Type Joint (RTJ); Male/Female (MF); Tongue & Groove (TG) |
| Surface Finish |
Spiral serrated, 125–250 µinch Ra (3.2–6.3 µm); RTJ grooves: 6.3 µm Ra max |
| Bolting |
Studs: ASTM A193 B7/B7M/B8; Nuts: ASTM A194 2H/8M; quantities and diameters per ASME B16.5 |
| Inspection |
100% PMI; Magnetic Particle (MT) or Penetrant (PT) per ASME V; Ultrasonic (UT) optional; Hydrotest at 1.5× design pressure |
| Certification |
EN 10204 Type 3.1 (inspection certificate) standard; Type 3.2 (third-party witnessed) on request |
| Marking |
Stamped: manufacturer logo, material grade, size, class, schedule, heat number, heat treatment code |
| Coating |
Machined faces coated with anti-rust oil; external surfaces with epoxy or galvanized per project specification |
| Packaging |
Wooden crates or steel pallets, with protective caps on all sealing faces, suitable for sea freight |
FAQ
1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.
2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
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ASME B16.5 Class150 Forged Steel Socket Weld Flange A105 RF Images
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