API 605 Large Diameter Flanges

SSM supplies high-quality API 605 large diameter flanges, designed for pipeline applications in oil, gas, petrochemical, and power generation industries. These flanges are manufactured according to the API 605 standard (now incorporated into ASME B16.47 Series B) and are ideal for handling large pipe sizes under moderate pressure.

📘 Overview of API 605 Flanges

Standard: Originally API 605, now ASME B16.47 Series B

Nominal Sizes: 26" to 60" (DN 650 to DN 1500)

Pressure Class: 75 psi to 900 psi (Class 75, 150, 300, 600, 900)

Facing Types:

Raised Face (RF)

Ring Type Joint (RTJ)

⚙️ Materials Available from SSM

Carbon Steel: ASTM A105, A350 LF2, A516 Gr.70

Stainless Steel: ASTM A182 F304, F316, F321

Duplex & Super Duplex: F51 (2205), F53, F55

Nickel Alloys: Inconel 625, Monel 400, Hastelloy C276

📐 Flange Types Offered

Weld Neck (WN) Flanges

Blind (BL) Flanges

Slip-On (SO) Flanges

Lap Joint (LJ) Flanges

Threaded and Socket Weld Types (as needed)

🛠️ Key Features

Available in large diameters (up to 60")

Full compliance with ASME B16.47 Series B

CNC-machined for high dimensional accuracy

Optional corrosion-resistant coating or CRA cladding

NACE MR0175 materials available for sour service

✅ Why Choose SSM for Large Diameter Flanges

30+ years of manufacturing experience

In-house forging, heat treatment, and NDT facilities

API, ISO, and PED-certified production

Custom flanges available per drawing or project spec

Rapid delivery for urgent orders

📩 Contact SSM today to request a quote or technical specification sheet for API 605 / ASME B16.47 Series B flanges.

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