When sourcing for international piping projects, clarity on standards is as critical as the material itself. A common point of discussion among procurement teams is the application of the ASME B16.5 standard to carbon steel flanges. While the market frequently asks for “plate flanges,” technical precision requires an understanding of forged integrity.
Technical Clarification: ASME B16.5 Forged Flanges
It is essential to note that the ASME B16.5 standard for pipe flanges specifically focuses on Forged Carbon Steel Flanges (such as ASTM A105). Forgings provide superior grain flow and structural strength, which are vital for high-pressure and high-temperature services.
However, in many low-pressure, non-critical applications, Carbon Steel Plate Flanges (machined from ASTM A36 or Q235B plate) are widely utilized. At HB Steel, we ensure that even when supplying plate-cut options, the dimensions, bolt hole patterns, and tolerances strictly adhere to the ASME B16.5 framework, providing a cost-effective alternative for Class 150 and Class 300 systems without compromising on fitment.
Such as:
- Product name: Carbon steel plate flanges
- Standards: DIN, JIS, ASME, ANSI, GOST, etc.
- Material: carbon steel ASTM A105/A150N, A350, F42, F46, F48, F50, F52, F56 etc.
- Pressure: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500;
- PN6, PN10, PN16, PN25, PN40, PN64, etc.
- Size: 1/2 inch- 48 inch , DN10-DN2000, or customer size
- Surface: RF, FF
- Surface Treatment: Oil black paint, Anti-rust oil, Yellow transparent, Cold and hot galvanized
Comprehensive Material Grades: From A105 to A36
To support diverse project requirements, we offer a range of material grades tailored to specific environments:
- ASTM A105 Forged Carbon Steel Flanges: The industry standard for ambient and high-temperature pressure systems.
- ASTM A36 Plate Flanges: A reliable choice for structural applications and low-pressure water treatment lines.
- Q235B Carbon Steel Fittings: Highly sought after for general infrastructure projects in Southeast Asia and the Middle East due to their excellent weldability and economic value.
Targeted Long-Tail Specifications for Global Projects
Precision is key in large-scale procurement. HB Steel supplies a full spectrum of ASME B16.5 compliant flanges including:
- Class 150 Carbon Steel Slip-on Flanges (SO): Designed for easy installation and ideal for low-pressure fluid transport.
- ASME B16.5 Blind Flanges (BL): Essential for sealing pipe ends and pressure vessel openings in oil and gas refineries.
- Raised Face (RF) vs. Flat Face (FF): We offer custom machining for gasket surfaces to ensure a leak-proof seal across all ANSI B16.5 plate flange dimensions.
Why RAYOUNG Brand Means Reliability?
Choosing the RAYOUNG brand for your bulk flange orders means you are partnering with a factory that prioritizes technical transparency:
CNC Precision Machining: Every flange undergoes meticulous CNC turning to ensure the serrated spiral finish meets standard requirements for optimal gasket seating.
Surface Protection & Packaging: We provide black paint, anti-rust oil, or hot-dip galvanized finishes to protect against corrosion during long-haul sea freight to regions like Chile, Russia, or the UAE.
Total Traceability: We provide an EN 10204 3.1 Mill Test Certificate (MTC) with every dispatch, confirming chemical analysis and mechanical properties.
Our ASME B16.5 forged flange Quality Guarantee:
From the raw material to the finished products, each link detection process is conducted in strict accordance with the ISO standard.
Commissioned by the long-term cooperation of third-party institutions for the final examination of the products, such as SGS, Pony, BV, etc.
Marking & Package
Marking: Stander-Material-Grade-Size-Heat No. and our trademark
We can also mark and pack according to the customer’s special requirements
Engineering Your Supply Chain Success
Whether your project requires high-pressure forged flanges for a refinery or standard carbon steel plate flanges for a water treatment plant, HB Steel delivers. Our strategic location near the Port of Tianjin allows us to manage logistics efficiently, ensuring your large-scale industrial fittings arrive on time and within budget.
Contact our technical sales team today for an ASME B16.5 flange weight chart or a customized quotation at
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