Carbon Steel Flange Manufacturer

Carbon steel flanges offer high strength, good weldability, and wear resistance, making them reliable in high-pressure, high-temperature, and harsh environments.

Carbon Steel Flange Supplier

Carbon steel flanges are widely used in industrial applications due to their excellent strength, durability, and cost-efficiency. At SSM, we provide a comprehensive range of carbon steel flanges to meet various piping system requirements.

Carbon Steel Flange Types: WN SO BL SW TH LJ customized carbon steel flange

Carbon Steel Flange Material: ASTM A105 ASTM A350 LF2 ASTM A694 F42/F52/F60/F65 Q235, Q345 (GB Standard)

Carbon Steel Flange Specifications:

Sizes: 1/2″ to 80″ (DN15 to DN2000).
Pressure Ratings: ASME/ANSI Classes: 150#, 300#, 600#, 900#, 1500#, 2500#. PN Ratings (EN Standard): PN6, PN10, PN16, PN25, PN40, PN64, PN100.
Facing Types:RF FF RTJ
Standards:ASME B16.5, B16.47, EN 1092-1, DIN, JIS, GB/T.

Carbon Steel Pipe Flange in China

As a leading Carbon steel manufacturer in China , SSM delivers comprehensive carbon steel flange solutions covering all industrial needs. Our product range includes 6 standard types (Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint) and custom-designed flanges, manufactured in premium materials like ASTM A105 for general service, A350 LF2 for low-temperature applications (-46°C), and high-strength A694 grades (F42-F65). With pressure ratings from ASME 150# to 2500# and EN PN6 to PN100, we serve diverse sectors including oil & gas, chemical processing, and power generation. All products comply with international standards (ASME B16.5, EN 1092-1) and undergo strict quality control, ensuring reliable performance in extreme conditions. Custom coatings (galvanization, epoxy) available for corrosive environments.

Types of Carbon Steel Flanges We Supply

We offer the following types of carbon steel flanges: Weld Neck Flange, Slip-on Flange, Socket Weld Flange, Blind Flange, Lap Joint Flange, Threaded Flange, etc.

We can also customize flanges according to your specific requirements.

Carbon Steel Weld Neck Flange

Carbon Steel Blind Flange

Carbon Steel Socket Weld Flange

Carbon Steel Threaded Flange

Carbon Steel Lap Joint Flange

Carbon Steel Slip On Flange

Carbon Steel Blank Flange

Carbon Steel LWN Flange

Carbon Steel Spectacle Blind Flange

Carbon Steel Paddle Blind Flange

Carbon Steel Paddle Spacer Flange

Carbon Steel Orifice Flange

Carbon Steel Elbow Flange

Carbon Steel Flange Olet

Carbon Steel Square Flange

Carbon Steel Custom Flange

Materials of Carbon Steel Flanges We Supply

ASTM A105 Carbon Steel Flange

ASTM A105 flanges are made from carbon steel with a carbon content not exceeding 0.35%. These flanges conform to the ASTM A105 standard and are commonly used to connect pressure vessels and piping systems.

They have good strength, toughness, and weldability, making them suitable for environments with temperatures between -29°C and 425°C in industries such as oil, chemicals, and power.

ASTM A350 Carbon Steel Flange

ASTM A350 flanges comply with the ASTM A350 standard and are typically made from low-temperature carbon steel, such as LF2 (low-temperature carbon steel) and LF3 (low-temperature chromium-molybdenum steel).

These flanges are specifically designed for low-temperature applications and are ideal for environments ranging from -50°F (-46°C) to -150°F (-101°C).

They are commonly used in LNG transportation, chemical processing, and low-temperature pipelines, offering excellent low-temperature impact toughness and resistance to brittle fracture.

ASTM A694 Carbon Steel Flange

ASTM A694 flanges conform to the ASTM A694 standard and are typically made from carbon steel or alloy steel. Common grades include F52, F60, F65, F70, etc.

These flanges are primarily used in high-pressure, high-strength piping systems. The ASTM A694 standard is designed for high-strength carbon and alloy steel flanges, especially for applications with high-pressure ratings.

They are widely used in the oil and gas transmission, chemical industry, and high-temperature or harsh environments.

Common Carbon Steel Flange Material Chemical Composition (Weight Percentage, %)

Element	C (Carbon)	Mn (Manganese)	P (Phosphorus)	S (Sulfur)	Si (Silicon)	Cr (Chromium)	Mo (Molybdenum)	Ni (Nickel)	Cu (Copper)	V (Vanadium)	Nb (Niobium)
ASTM A105 (Forging)	≤0.35	0.60–1.05	≤0.035	≤0.040	0.10–0.35	–	–	–	–	–	–
ASTM A350 LF2 (Low-Temp Forging)	≤0.30	0.60–1.35	≤0.025	≤0.025	0.15–0.30	≤0.30	≤0.12	≤0.40	≤0.40	–	–
ASTM A694 F60 (Pipeline Flanges)	≤0.26 (≤0.22 for t>20mm)	1.20–1.60	≤0.025	≤0.015	0.15–0.40	≤0.50	≤0.15	≤0.50	≤0.50	≤0.06	≤0.05

Manufacturing Standards for Carbon Steel Flanges

Common manufacturing standards include:

ASME B16.5 Flange

The ASME B16.5 standard applies to flanges with diameters ranging from 1/2 inch to 24 inches and pressure ratings of 150, 300, 600, 900, 1500, and 2500. It is typically used for pressure piping systems and covers the design and manufacturing requirements for various types of piping flanges.

ASME B16.47 Flange

The ASME B16.47 standard applies to flanges with diameters of 24 inches and larger, with sizes up to 60 inches or even larger. Since these flanges deal with higher pressures and larger sizes, the thickness and strength requirements are higher than those of ASME B16.5. These flanges are widely used in high-pressure piping systems, particularly in the oil, gas, and chemical industries.

EN 1092-1 Flange

The EN 1092-1 standard applies to flanges with diameters ranging from DN 10 to DN 4000 and covers multiple pressure ratings such as PN 2.5, PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, PN 100, etc. These flanges are primarily used in the European market for piping system connections.

In addition to ASME B16.5, ASME B16.47, and EN 1092-1, flange manufacturing standards vary depending on the region, application field, pipeline pressure, and temperature. Other common standards include AWWA C207, API 6A, ISO 7005, BS 4504, JIS B2220, and DIN 2573/2576, which are used in industries such as oil and gas, chemical, power, water treatment, and more, ensuring flange reliability and safety in extreme environments like high pressure, high temperature, and corrosive conditions.

One-Stop Carbon Steel Flange Provider for All Your Needs

SSM has significant product advantages in manufacturing carbon steel flange, Whether it’s quality or price, we will meet your needs.

More Information About Carbon Steel Flanges

Difference Between Stainless Steel Flanges and Carbon Steel Flanges

Stainless Steel Flanges offer superior corrosion resistance, durability, and strength, making them ideal for harsh, high-temperature, and high-corrosion environments but come at a higher cost.

Carbon Steel Flanges are more cost-effective, strong, and suitable for high-pressure applications, but they are less resistant to corrosion and require more maintenance.

Carbon steel to stainless steel flange connections

Connecting carbon steel flanges to stainless steel flanges requires careful consideration of material compatibility, potential galvanic corrosion, and the use of proper isolation techniques (like insulating gaskets). While both materials are commonly used in industrial piping systems, ensuring proper connection methods will prevent long-term maintenance issues such as corrosion, leaks, and system failure.

Key factors include selecting the right gasket material, using compatible bolts, and addressing thermal expansion differences.

Why Can SSM Provide You with High-Quality Carbon Steel Flange?

SSM can provide high-quality carbon steel flanges due to its extensive experience, adherence to international standards like ASTM A105, A350, A694, and ASME B16.5, and use of premium raw materials. With advanced manufacturing processes, rigorous quality control, and customized solutions, SSM ensures that each flange meets the required mechanical properties and dimensional accuracy.

Additionally, we offer competitive pricing and timely delivery, making us a reliable partner for all your carbon steel flange needs.

More Resources:

Carbon Steel Pipe