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15CrMo Alloy Steel Weld Neck Flanges custom

15CrMo Alloy Steel Weld Neck Flanges Manufacturers

-- Steady & Reliable Manufacturer --

Heat-Resistant Alloy Steel Flange Solutions

For power generation and thermal processing systems operating in the range of 400°C to 550°C, our 15CrMo Alloy Steel Weld Neck Flanges provide a robust and cost-effective alternative to high-alloy steels. 15CrMo is a low-alloy heat-resistant steel that offers excellent creep strength and thermal stability due to its balanced chromium and molybdenum content. The weld neck design features a long tapered hub that seamlessly transitions to the pipe, providing structural reinforcement that is essential for high-pressure boiler lines. As a specialized manufacturer, we utilize advanced forging techniques to ensure a uniform distribution of alloying elements, followed by a normalized and tempered heat treatment. This results in a flange that can withstand the cyclic thermal loads of modern industrial boilers while resisting high-temperature oxidation and graphitization.

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15CrMo Technical Specifications

ParameterSpecification Detail
Material Grade15CrMo, ASTM A182 F11/F12 Equivalent
StandardsASME B16.5, DIN 2633, JIS B2220
Operating TemperatureUp to 550°C (1022°F)
Pressure ClassesClass 150 to Class 2500 / PN10 to PN400
Heat TreatmentNormalized and Tempered (N+T)
CertificationFull MTC 3.1 with chemical and mechanical test

High-Temperature Power Applications

These 15CrMo weld neck flanges are widely utilized in thermal power plants for main steam lines, reheating pipes, and boiler feed water systems. In the petrochemical industry, they are essential for high-temperature vessels and heat exchangers handling non-corrosive hydrocarbons at elevated pressures. They are also found in urban heating networks and industrial steam distribution headers. Because of their excellent thermal fatigue resistance, they are ideal for use in waste-to-energy plants and biomass boilers where temperature fluctuations are common. The weld neck configuration is specifically chosen for these high-stress environments to ensure the joint remains leak-proof under the combined effects of internal pressure, thermal expansion, and pipe weight.

Material & Engineering Advantages

  • High Creep Strength: Molybdenum content ensures the material resists slow deformation at high temperatures.
  • Superior Weldability: Despite its alloy content, 15CrMo offers excellent welding characteristics when using appropriate pre-heating.
  • Tapered Stress Distribution: The hub design directs stress away from the flange face and into the pipe, preventing flange warping.
  • Heat Resistance: Chromium content provides protection against surface oxidation in high-temperature steam environments.

Trade & Delivery Information

We support payments via T/T and L/C. Since 15CrMo is often used in critical boiler systems, we provide comprehensive NDT (Non-Destructive Testing) reports, including Ultrasonic Testing (UT) and Magnetic Particle Inspection (MPI) to ensure internal integrity. Each flange is coated with black anti-rust paint or oil and shipped in reinforced wooden crates. We offer rapid delivery to global energy hubs, supporting both maintenance turnarounds and new plant construction. Every 15CrMo flange is laser-etched with its heat number for 100% traceability. Our technical team can also provide guidance on the necessary post-weld heat treatment (PWHT) temperatures required to maintain the metallurgical properties of the 15CrMo connection.

  • Q: What is the difference between 15CrMo and 12Cr1MoV?
  • A: 12Cr1MoV contains Vanadium, which allows it to handle slightly higher temperatures (up to 580°C), while 15CrMo is more commonly used for applications up to 550°C.
  • Q: Do these flanges require pre-heating before welding?
  • A: Yes, pre-heating to 150°C-250°C is typically recommended for 15CrMo to prevent hydrogen-induced cracking in the weld zone.
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Jiangyin Gaoxin Pipe Fittings Co., Ltd.
About Us
JIANGYIN GAOXIN PIPE FITTINGS CO.,LTD.
Our company is a professional manufacturer of pressure piping components. As 15CrMo Alloy Steel Weld Neck Flanges Manufacturers，Our product range covers butt-weld, socket-weld, and threaded pipe fittings, including flanges and customized non-standard parts. These products are widely used in industries such as oil & gas, chemical processing, power generation, shipbuilding, papermaking, metallurgy, pharmaceuticals, and food processing. We manufacture according to standards such as ASME, EN,JIS,DIN,ANSI,GOST, MSS, GB/T,HG, DL, SH, SY,and have a complete range of inspection equipment, a strict quality control system, and various certifications（PED,AD2000,EAC, ABS,BV, DNV,NORSOK M650, ISO9001,ISO14001,ISO45001,etc.）, making us a leader in the industry.

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