Octal Flange | Premium Carbon & Stainless Steel Flange Supplier from China

About Octal Flange

A trusted division of Octal Steel, we specialize in providing high-quality forged steel flanges for industrial applications worldwide.

Your Responsible Supply Partner

Octal Flange is dedicated to delivering reliable piping solutions to industrial companies and individuals. Based in China, we operate multi-base inventory and manufacturing facilities across the north and south regions, ensuring rapid response and delivery.

With extensive in-stock inventories of carbon, alloy, and stainless steel flanges — including raw material plates — we can meet urgent requirements with precision and speed.

One-stop purchase center for all flange needs
Prompt quotations within 24 hours
Urgent material delivery in 48 hours
Customized dimensions and quantities
Compliance with ASTM, ASME, and MSS standards

Why Choose Us

We are committed to excellence in quality, speed, and service — making us the preferred partner for flange procurement.

Fast Turnaround

Receive quotes within 24 hours and urgent deliveries in just 48 hours. Our strategic inventory locations near major ports ensure swift dispatch.

Large In-Stock Inventory

We maintain vast stocks of carbon, alloy, and stainless steel flanges and raw materials, enabling immediate fulfillment of both standard and custom orders.

Custom Manufacturing

Need non-standard sizes or specific materials? We offer full customization to meet your exact technical and dimensional requirements.

Our Products

Comprehensive range of forged steel flanges manufactured to international standards. All products are precision-engineered for durability and leak-free performance.

Slip On Flange (SO)

Designed to slip over the pipe with an internal diameter slightly larger than the pipe. Ideal for low-pressure applications.

Material: ASTM A105, A182
Standard: ASME B16.5
Size Range: 1/2" to 48"

Weld Neck Flange (WN)

Features a long tapered hub that reduces stress concentration and provides strong, reliable joints in high-pressure systems.

Material: ASTM A105, A182 F304/F316
Standard: ASME B16.5, B16.47
Size Range: 1/2" to 60"

Blind Flange

Solid plate used to close the end of a pipeline or vessel. Ideal for testing, maintenance, or system termination.

Material: ASTM A105, A182, A516
Standard: ASME B16.5, MSS SP-44
Size Range: 1/2" to 72"

Socket Weld Flange (SW)

Pipe fits into a recessed area before welding. Suitable for small bore, high-pressure piping systems.

Material: ASTM A105, A182 F11/F22
Standard: ASME B16.5
Size Range: 1/2" to 24"

Lap Joint Flange (LJ)

Used with a stub end; allows easy alignment and is ideal for systems requiring frequent dismantling.

Material: ASTM A105, A182
Standard: ASME B16.5
Size Range: 1/2" to 48"

Threaded Flange (THD)

Features internal threads to connect to externally threaded pipes. Ideal for non-welded applications.

Material: ASTM A105, A182
Standard: ASME B16.5
Size Range: 1/2" to 24"

Forged Steel Flange

High-strength flanges manufactured through precision forging for superior mechanical properties and reliability.

Material: ASTM A105, A182, A350 LF2
Standard: ASME B16.5, B16.47
Size Range: 1/2" to 60"

Flanged Joint Pipe

Pre-assembled piping sections with flanges welded at both ends. Reduces on-site labor and ensures alignment accuracy.

Material: Carbon & Stainless Steel
Standard: ASME B16.5, ASTM A106/A312
Size Range: 2" to 48"

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Compliance with International Standards

All our flanges are manufactured and tested in accordance with recognized global standards to ensure safety, compatibility, and performance.

ASTM A105

Carbon steel flanges for ambient- and high-temperature service.

ASTM A182

Alloy and stainless steel forgings for high-temperature service.

ASTM A350

Carbon and low-alloy steel flanges for low-temperature service (e.g., LF2).

ASTM A694

High-strength carbon and alloy steel flanges for pipeline transmission systems.

ASME B16.5

Standard for pipe flanges and flanged fittings from NPS 1/2" to 24".

MSS SP-44

Steel pipe line flanges for larger diameter applications (NPS 26" to 60").

Frequently Asked Questions

What materials do you offer for flanges?

We supply carbon steel (ASTM A105), alloy steel (ASTM A350 LF2, A694), and stainless steel (ASTM A182 F304, F316, F11, F22) flanges.

Can you provide custom flange dimensions?

Yes, we offer full customization for size, pressure rating, face type, and material to meet your project specifications.

What is your lead time for urgent orders?

We can deliver urgent orders within 48 hours from confirmation, thanks to our large in-stock inventory near major Chinese ports.

Do you comply with ASME and ASTM standards?

Absolutely. All our flanges are manufactured to ASME B16.5, B16.47, MSS SP-44, and relevant ASTM standards with full traceability and certification.

How can I request a quote?

Visit octalflange.com to submit your inquiry. We respond within 24 hours during business days.

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Premium Carbon & Stainless Steel Flanges from China