ASTM A105 Flanges Manufacturer in China | ASME B16.5 Carbon Steel Flanges – SSM

Complete size and pressure range
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ASTM A105 Carbon Steel Flanges Manufacturer – SSM

SSM is a reliable China supplier of ASTM A105 forged carbon steel flanges, delivering high-quality ASME B16.5 flanges for oil & gas, petrochemical, power, and general industrial piping systems.

Our A105 flanges combine excellent mechanical strength, good weldability, and stable performance under pressure, making them one of the most widely used carbon steel flange materials worldwide.

Hot-Selling ASTM A105 Flanges — Premium Supply by SSM

SSM offers hot-selling ASTM A105 forged carbon steel flanges, including weld neck, slip-on, blind, and threaded types with a complete size range and ready stock. Manufactured in accordance with ASME standards, these flanges provide high strength, reliable sealing performance, and stable quality, making them widely used in oil & gas, petrochemical, power, and industrial piping systems. With direct factory supply, SSM ensures competitive pricing, fast delivery, and full certification support, making us your dependable partner for A105 flange procurement.

A105 Black Painting Flange

A105 Black Painting Flange is a forged carbon steel flange coated with black paint to provide temporary corrosion protection during storage and transportation.

ASTM A105 Blind Flange

ASTM A105 Blind Flange is a solid forged carbon steel flange used to close the end of a pipeline or pressure vessel, ensuring safe isolation and easy maintenance access.

ASTM A105 WN Flange

ASTM A105 Weld Neck Flange is a high-strength forged flange with a tapered hub designed for butt-welding, providing excellent stress distribution in high-pressure and high-temperature applications.

ASTM A105 SORF Flange

ASTM A105 SORF Flange is a slip-on raised face forged carbon steel flange that is easy to install and commonly used in low to medium pressure piping systems.

Product Range

We manufacture and supply:

A105 Weld Neck Flange (WN)
A105 Slip On Flange (SO / SORF)
A105 Blind Flange (BL)
A105 Threaded Flange
A105 Socket Weld Flange
A105 Spectacle Blind
A105 Reducing Flange

Surface options: black painting, anti-rust oil, black coating, or customized coating.

Size & Pressure Range

Ukuran: 1/2” – 60” (DN15–DN1500)
Pressure Class: 150 / 300 / 600 / 900 / 1500 / 2500
Facing: RF, FF, RTJ

Standards & Certification

ASTM A105
ASME B16.5 / B16.47
EN 10204 3.1 or 3.2
NDT, PMI, mechanical & chemical testing

ASTM A105 TECHNICAL DATASHEET

ASTM A105 Flange Material Properties

Milik	Nilai
Jenis Bahan	Forged Carbon Steel
Standar	ASTM A105
Kekuatan Hasil	Tekanan ≥ 250MPa
Kekuatan Tarik	485–620 MPa
Kekerasan	≤ 187 HB
Service Temperature	−29°C to 425°C

A105 flanges must meet minimum mechanical requirements to ensure safe performance in pressure systems.

Minimum yield strength: Tekanan 250MPa
Tensile strength: 485 – 620 MPa
Maximum hardness: 187 HB

These properties make A105 flanges suitable for moderate to high pressure applications.

Chemical Composition (Typical, % max unless noted)

The chemical composition of ASTM A105 carbon steel is carefully controlled to achieve the required strength and toughness.

Elemen	%
Karbon	≤ 0,35
Mangan	0,60–1,05
Fosfor	≤ 0,035
Sulfur	≤ 0,040
silikon	0,10–0,35

This balanced composition provides a combination of strength and weldability while keeping material costs reasonable.

Typical Ordering Information

When requesting a quote, provide:

Flange type (WN / SO / BL etc.)
Size (NPS / DN)
Pressure class
Facing (RF / FF / RTJ)
Standar
Kuantitas
Coating & inspection requirements

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SSM has significant product advantages in manufacturing ASTM A105 Flanges. Whether it’s quality or price, we will meet your needs.

The Complete Guide to ASTM A105 Flanges: Specifications, Types, Applications, and Buying Tips

In industrial piping systems, flanges play a critical role in connecting pipes, valves, pumps, and other equipment while ensuring leak-free operation under pressure and temperature variations. Among the many flange materials available, ASTM A105 forged carbon steel flanges are one of the most widely used due to their excellent strength, affordability, and versatility.

This comprehensive guide explains everything you need to know about A105 flanges — from material properties and standards to types, dimensions, pressure ratings, applications, and purchasing considerations. Whether you are an engineer, procurement specialist, distributor, or project contractor, this article will help you better understand and select the right A105 flange for your project.

ASTM A105 is a standard specification covering forged carbon steel components for use in pressure systems at ambient and elevated temperatures. Flanges manufactured from this material are known for their:

Kekuatan mekanik tinggi
Good ductility
Excellent machinability
Reliable weldability
Cost efficiency

Because of these advantages, A105 flanges are commonly used in oil & gas, petrochemical, power generation, and water treatment industries.

ASTM A105 Flange Standards

A105 refers to the material specification, while flange dimensions and tolerances are defined by other standards. The most commonly applied standards include:

ASME B16.5 — Pipe flanges up to 24 inches
ASME B16.47 — Large diameter flanges
MSS SP-44 — Steel pipeline flanges
API specifications — Oil & gas applications

These standards ensure interchangeability, safety, and compatibility across global piping systems.

Pressure Ratings of A105 Flanges

Pressure rating is one of the most important selection criteria. A105 flanges are typically available in: Class 150/Class 300/Class 600/Class 900/Class 1500/Class 2500

The allowable pressure depends on both temperature and flange class, following ASME temperature-pressure tables.

Kisaran Suhu

ASTM A105 flanges are generally suitable for service temperatures from approximately: −29°C to 425°C

For lower temperature service, materials such as ASTM A350 LF2 may be recommended instead.

Dimensions and Size Range

A105 flanges are produced in a wide range of sizes to accommodate different piping systems.

Size range: 1/2 inch to 60 inches (DN15 – DN1500)
Facing types: RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint)

Standardized dimensions ensure compatibility with pipes, fittings, and valves worldwide.

Surface Finishes and Coatings

To prevent corrosion during storage and transportation, A105 flanges can be supplied with various surface treatments:

Black painting
Anti-rust oil
Black coating
Galvanizing (optional)

Coating selection depends on project requirements and environmental conditions.

Applications of A105 Flanges

Because of their reliability and affordability, A105 flanges are widely used across industries.

Minyak dan Gas-Used in pipelines, refineries, and offshore platforms where strength and pressure resistance are critical.
Petrochemical Plants-Suitable for process piping systems carrying chemicals and hydrocarbons.
Pembangkit Listrik-Used in steam, water, and auxiliary piping systems.
Pengolahan Air-Common in municipal and industrial water distribution systems.
Kelautan dan Pembuatan Kapal-Applied in onboard piping systems due to durability and cost efficiency.

Advantages of ASTM A105 Flanges

1. Cost-Effective-Compared with alloy or stainless steel flanges, A105 offers excellent performance at a lower cost.

2. High Strength-Forged structure provides superior mechanical properties compared with cast materials.

3. Wide Availability-Global manufacturing and standardized dimensions make sourcing easy.

4. Good Weldability-Low alloy content allows easy welding without complex procedures.

5. Versatile Applications-Suitable for most general industrial pressure systems.

Keterbatasan

Despite its advantages, A105 is not suitable for every environment.

Not ideal for low-temperature cryogenic service
Limited corrosion resistance compared to stainless steel
Requires coating or painting for outdoor exposure

Understanding these limitations helps ensure correct material selection.

How to Select the Right A105 Flange

When specifying an A105 flange, consider the following factors:

Flange type (WN, SO, BL, etc.)
Pressure class
Size (NPS or DN)
Facing type (RF, FF, RTJ)
Service temperature
Coating requirements
Inspection and certification

Proper selection ensures safety, performance, and cost optimization.

Quality Control and Testing

Reliable manufacturers perform comprehensive testing, including:

Chemical composition analysis
Mechanical testing
Ultrasonic testing (UT)
Magnetic particle testing (MT)
Positive material identification (PMI)
Pemeriksaan dimensi

Certification such as EN 10204 3.1 or 3.2 is often required for critical projects.

A105 Flange Price Factors

The price of A105 flanges can vary significantly depending on:

Size and pressure class
Quantity ordered
Coating and testing requirements
Raw material market conditions
Delivery schedule

Bulk purchasing typically reduces unit cost.

A105 Flanges from SSM

As a professional carbon steel flange supplier in China, SSM provides a full range of ASTM A105 forged flanges for global industrial projects. With integrated forging, machining, and inspection capabilities, SSM supports distributors, EPC contractors, and end users with reliable products and competitive pricing.

ASTM A105 flanges remain one of the most widely used flange materials due to their balance of strength, versatility, and cost efficiency. With standardized dimensions, multiple types, and broad pressure ratings, they are suitable for a wide range of industrial piping systems.

Understanding their material properties, applications, and selection criteria helps engineers and buyers make informed decisions, ensuring safe and reliable operation of pressure systems.

Whether for new construction, plant maintenance, or distribution supply, choosing high-quality A105 flanges from a trusted manufacturer is essential for long-term performance.

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