When it comes to strength, 耐久性, and affordability in industrial piping systems, 炭素鋼フランジ are one of the most widely used components worldwide. From oil refineries and gas pipelines to power plants and shipyards, carbon steel flanges form the backbone of high-pressure, high-performance piping infrastructure.

この記事では, we’ll explore what carbon steel flanges are, 彼らのタイプ, 成績, 利点, アプリケーション, and why industries around the globe trust them for critical operations. Whether you’re a procurement manager or an engineer designing a new system, understanding carbon steel flanges is essential for making informed decisions.

As a global supplier of industrial flanges, SASA FLANGE offers a wide range of carbon steel flange solutions that meet international standards and perform reliably in even the harshest environments.

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What is a Carbon Steel Flange?

あ 炭素鋼フランジ is a type of pipe fitting made from carbon steel that is used to connect pipes, バルブ, パンプス, and other equipment to form a piping system. It provides easy access for cleaning, 検査, modification, or repair.

用語 “炭素鋼” refers to a steel alloy that primarily consists of iron and carbon, with a limited amount of alloying elements. The higher the carbon content, the stronger and harder the material becomes — but with reduced ductility.

Carbon steel flanges are commonly manufactured to ASME, ASTM, EN, DIN, and JIS 標準, ensuring global compatibility and safety.

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Key Characteristics of Carbon Steel

Before diving deeper into the flange itself, it’s important to understand the base material — carbon steel. Its properties include:

• High tensile strength

• Excellent toughness

• Good weldability

• 費用対効果の高い

• Moderate corrosion resistance (can be improved with coatings)

Common carbon steel grades used for flanges include ASTM A105, A350 LF2, A694 F52 to F70, そして A516 Gr.70.

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Types of Carbon Steel Flanges

Carbon steel flanges come in a variety of types depending on their connection and functional requirements. The most popular types include:

1. 溶接ネックフランジ

Designed for high-pressure applications, weld neck flanges have a long tapered hub that is butt-welded to the pipe. This provides excellent stress distribution and reinforcement.

2. スリップオンフランジ

Easy to install and weld, slip-on flanges slide over the pipe and are commonly used in low-pressure systems.

3. ブラインドフランジ

Used to close off the end of a piping system or a pressure vessel opening. They are vital in systems that require frequent inspection or isolation.

4. ソケット溶接フランジ

小径に最適, 高圧パイプ. The pipe is inserted into the flange socket and then welded.

5. ねじ付きフランジ

Used in systems where welding is not an option. These are threaded onto the pipe instead of being welded.

6. ラップジョイントフランジ

Paired with a stub end, lap joint flanges are ideal for systems requiring frequent dismantling.

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Advantages of Carbon Steel Flanges

Carbon steel flanges are chosen across industries for several compelling reasons:

• High strength and pressure resistance
  Perfect for high-pressure steam, 油, およびガスシステム.

• Affordable
  Compared to stainless steel or exotic alloys, carbon steel offers a much lower price point.

• 溶接性
  Easily welded into piping systems, reducing installation time and cost.

• 多用途
  Can be used with a wide range of pipe materials and media.

• Customizable
  Available in various dimensions, 圧力クラス, and coatings (例えば, galvanization, black oxide, anti-rust oil).

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Applications of Carbon Steel Flanges

Carbon steel flanges are used in a wide variety of industries due to their durability and strength. Some typical applications include:

• 石油およびガスのパイプライン

  • High-pressure and high-temperature environments demand strong, 漏れ防止接続.

• 発電

  • Used in steam systems, タービン, とコンデンサー.

• 化学処理

  • When coated or lined, carbon steel flanges can handle mildly corrosive chemicals.

• 水処理

  • Common in infrastructure where pressure and durability are key.

• Shipbuilding and Marine Engineering

  • Especially when combined with coatings to protect against saltwater.

• Construction and HVAC

  • Ideal for connecting ventilation and fluid systems in large buildings.

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How to Ensure Quality in Carbon Steel Flanges

When choosing a carbon steel flange, quality is critical to ensure safety and performance. Here are a few things to look for:

• Material Certification
  Request an EN 10204 3.1 または 3.2 証明書 to verify chemical and mechanical properties.

• Dimensional Accuracy
  Verify that the flange conforms to standards like ASME B16.5, EN 1092-1, または JIS B2220.

• 表面仕上げ
  Check for any signs of pitting, スケーリング, or corrosion. A clean, coated surface indicates proper handling.

• 圧力定格
  Ensure the flange has the correct 圧力クラス (例えば, 150, 300, 600, まで 2500).

• 熱処理
  Some applications require normalized or quenched & tempered materials like ASTM A350 LF2 for low-temperature use.

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Carbon Steel Flange vs. ステンレス製フランジ