Carbon Steel Flange

Carbon steel flange is a flange made of carbon steel material, its main components are iron and carbon. They are an essential component in piping systems, helping to connect and disconnect pipes, valves, and other equipment. Carbon steel flanges have excellent mechanical properties and are widely used in various industries.
Gnee offers carbon steel flanges in a variety of sizes, dimensions, and pressure ratings, allowing them to meet different piping system requirements. Our sales and technical support staff are trained to provide you with everything you need. Contact us now.

Gnee has a large inventory of carbon steel flange fittings, which allows to meet customers’ needs and deliver products on time. This avoids delays in project progress due to shortages. Our inventory management system is highly precise, ensuring inventory accuracy and real-time updates. Whether it is mass production or individual customized needs, Gnee can provide quick responses, which brings convenience and confidence to customers.

7 days for stock goods/ within 30-50 days / depending on your order quantity

Clear labels are tagged on the outside of the package for easy identification of the quantity and product I.D.

  • Bundles
  • Wooden Boxes
  • Crates
  • Packaging for P91 pipe as customer’s requirements

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A) Full Service: Pre, In, After
B) 15+ Years Exp.Global Export
C) 365 Days Always Online
D) Large-scale Reserve
E) Diversified Logistics Solution

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Types of Carbon Steel Flanges

Slip-on Flanges

Slip-on flanges are flat or raised face flanges with a 1/16″ lip. These flanges are good for pipe systems with low pressures and moderate temperatures. They can be easily welded into place and offer good corrosion resistance. Slip On (SO) is the most basic and easiest flange type.

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Socket Weld Flanges

A carbon steel socket weld flange is a type of flange that is specifically designed for socket welding connection. It is commonly used in small-diameter piping systems where high-pressure and high-temperature applications are involved. Carbon steel socket weld flanges have a socket-shaped bore and a counter-bore that allows for the insertion of the pipe end. They have a smaller diameter and thickness compared to other types of flanges, making them suitable for compact piping systems.

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Threaded Flanges

These flanges have threads on the inside of the flange, allowing them to be screwed onto the pipe. They are typically used in low-pressure applications and are easy to install and remove. A well-chosen flange is an invaluable asset if handled with care. 

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Lap Joint Flanges

The lap joint flange is a two-component design commonly used for larger-diameter piping configurations. It can be made from different types of steel, including carbon steel. It is often used to help simplify the assembly and dismantling of large-diameter and stiff piping systems.

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Blind Flange

A blind flange is a type of flange that is used to seal the end of a pipe or vessel opening. It is called a “blind” flange because it does not have a center bore or opening, unlike other types of flanges that are used for connecting pipes or equipment. The primary purpose of a blind flange is to provide a solid, leak-proof seal at the end of a pipe or vessel.
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Standard And Specification Of Carbon Steel Flanges

What Are The Features Of Flange Fittings?

The Excellent Features of Carbon Steel Flanges

Gnee is an exporter of carbon steel flanges with over 15 years of experience. We have our own factory and you can buy from us at an absolute price advantage. We use high-quality raw materials and product quality is guaranteed. Full range of specifications here, wide range of sizes here.

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Strength and Durability

Carbon steel flanges offer exceptional strength and durability. They can withstand heavy loads and provide structural stability, ensuring long-term performance and reliability.

Corrosion Resistance

Carbon steel flanges are highly resistant to corrosion, especially when compared to materials like cast iron. They can withstand exposure to aggressive fluids, chemicals, and humid environments.


Carbon steel flanges can be easily matched with pipes and fittings of the same material. They offer good compatibility with diverse systems in various industries.


Carbon steel flanges are relatively more cost-effective compared to materials like stainless steel or exotic alloys. This affordability factor is particularly important for industries operating on tight budgets.

Considerations On Choosing Flange

  • Oil and Gas Industry
  • Chemical Industry
  • Electric Power Industry
  • Construction
  • Water Treatment Industry
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Frequently Asked Questions

Gnee offers a large inventory of high-quality flange fittings in a variety of specifications. Get a free quote.

Carbon steel is a type of steel that contains varying degrees of carbon content, from 0.2% to 2.1%. Carbon steel offers excellent mechanical and chemical properties compared to other materials used in flange manufacturing. These include high tensile strength, corrosion resistance, and low cost. Carbon steel is versatile and can be easily welded, machined, and heat treated to suit various applications. The yield strength of carbon steel flanges ranges from 250 MPa to 1000 MPa, depending on the grade and thickness.

Carbon steel flanges can be considered environmentally friendly, as they have a long lifespan, reduce the need for frequent replacements, and are recyclable, contributing to sustainability.

Yes, carbon steel flanges are employed in water treatment and distribution systems, including those used for drinking water, to ensure secure connections and prevent leaks.

Yes, carbon steel flanges are well-suited for high-temperature and high-pressure applications, making them a preferred choice in industries like power generation and petrochemicals.

Why Choose Gnee Carbon Steel Flange Fittings?
Gnee provides carbon steel flange fittings to multiple industries, including the petrochemical industry, processing industry, etc. We have developed into a trusted global leader in the pipe fittings industry. Gnee offers ANSI, API and AWWA pipe flanges in carbon steel at a discounted price. In addition, we offer styles including butt weld flanges, slip-on flanges, blind flanges, threaded flanges, socket weld flanges, lap flanges, orifice flanges, ring flanges, and custom flanges in sizes available from 1/2 inch to 203 inches.

In addition, our high-quality flange fitting has been successfully exported to more than 60 countries such as Vietnam, Malaysia, Indonesia, Pakistan, UAE, and South Korea, etc. Many regular customers visit our company and factory and make multiple orders.

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What Services Does Gnee Provide?

Gnee can provide the following measurement services:

1. Dimensional measurement: Measure the dimensional parameters such as length, width, and thickness by measuring instruments to ensure the product is qualified and meets the design requirements.
2. Surface measurement: Measure parameters such as flatness, unevenness, and surface roughness of the product surface to help ensure that the quality and surface state meet the requirements.
3. Thickness measurement: Use a thickness measuring instrument to accurately measure the thickness to ensure that it meets the design requirements.
4. Material measurement: Use material analysis instruments to measure the chemical composition and mechanical properties of the product to ensure that the quality and performance meet the requirements.
5. Bending and Deformation Measurements: The degree of bending and deformation is measured and monitored by using tools such as bending measuring instruments and displacement sensors to ensure that it is within the allowable range.

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Gnee can customize the size and shape for your project according to specific project needs. The custom design of the product is carried out by a professional engineer and design team. Based on the requirements and constraints of the project, they will use calculation and simulation tools, combined with experience and technical knowledge, to optimize the steel pipe design to meet the specific needs of your engineering.

● According to the strength requirements of structural design, adjust the thickness, width, and length.
● The shape can be designed according to the characteristics of the project.
● If you consider the convenience of installation and maintenance, we can also add openings and passages for easy access and operation in the design for areas that require frequent maintenance.

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Purchasing Gnee’s steel product can provide the following deep processing services. We can customize according to the specific needs of customers to meet the requirements.

Cutting service: Product can be custom cut to obtain the desired shape and size according to the needs of customers. For example, flame cutting, plasma cutting, laser cutting, etc., can cut steel pipes into required blocks, special-shaped parts.
Bending and forming: Products are bent and formed by stress application and appropriate processes to obtain the desired shape.
Welding service: Product can be subjected to various types of welding services, including manual arc welding, gas-shielded welding, laser welding, etc.
Turning and machining of holes: Turning and machining of holes in product by using machining equipment. These processes produce smooth surfaces, precise holes and threads to meet specific assembly requirements.
Surface treatment: In order to improve the corrosion resistance and aesthetics of the steel product, surface treatment can be carried out. This includes methods such as spraying, hot-dip galvanizing, electroplating, etc. to add a protective layer and provide corrosion resistance.

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Gnee can provide the following testing services through third-party testing agencies. These third-party testing services can provide independent, objective verification that products comply with relevant standards and regulations.

Material chemical composition analysis: Through chemical composition analysis, determine whether the composition meets the standard requirements.
Mechanical performance test: Mechanical performance test includes tensile test, impact test, bending test, etc., which are used to determine whether the mechanical properties such as strength, toughness and ductility of products meet the specified requirements.
Metallographic testing: Through metallographic testing, check the structure, grain size, non-metallic inclusions, etc. of pipes to evaluate their quality and performance.
Corrosion performance test: Through the corrosion performance test, evaluate the corrosion resistance of products, including salt spray corrosion resistance, chemical corrosion resistance, etc.
Hardness test: Hardness test is used to measure the hardness of the products, and its strength and wear resistance can be evaluated according to the hardness value.
Ultrasonic flaw detection: Ultrasonic flaw detection is used to detect internal defects of products, such as cracks, pores, inclusions, etc.

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