Web Menu

Product Search

Language

Share

High Pressure Steam Pipeline Systems Alloy Steel Threaded Flanges custom

High Pressure Steam Pipeline Systems Alloy Steel Threaded Flanges Manufacturers

-- Steady & Reliable Manufacturer --

Precision Alloy Steel Threaded Flanges

Threaded Flanges, also known as Screwed Flanges, provide a weld-free mechanical connection by threading directly onto the pipe end. Our Alloy Steel Threaded Flanges are specifically designed for high-pressure steam pipeline systems where welding is impractical or prohibited due to fire hazards, explosive atmospheres, or the need for easy disassembly. Manufactured from ASTM A182 F11 and F22 chromium-molybdenum alloy steels, these flanges deliver the elevated temperature strength required for steam service. The internal threads are precision-cut to NPT (National Pipe Taper) or BSP standards, ensuring a leak-tight mechanical seal. As a specialized manufacturer, we produce these flanges with reinforced hub geometry to compensate for the inherent stress concentration at the thread root under cyclic thermal conditions. They are an essential component for steam tracing systems, small-bore instrumentation connections, and low-flow utility steam lines throughout industrial complexes, refineries, and power plants.

Categories

Product

Threaded Flange Technical Specifications

ParameterSpecification Detail
Material GradeASTM A182 F11 (1.25Cr-0.5Mo), F22 (2.25Cr-1Mo)
Thread StandardASME B1.20.1 (NPT), BS 21 (BSPT)
Design StandardASME B16.5, MSS SP-44
Pressure ClassClass 150 to Class 1500
Size Range1/8" to 4" (DN6 - DN100)
Max Service TempUp to 593°C (1100°F) for F22 grade

Steam & Industrial Applications

Alloy steel threaded flanges are an essential component throughout high-pressure steam networks in power plants and industrial facilities. They are used for small-bore steam take-off connections, condensate return lines, and safety valve inlet flanges where compact, weld-free connections are required. In refineries, they connect pressure gauges, thermowells, and control valve bypasses on high-temperature process lines. Chemical plants utilize them for steam injection points on reactors and heat exchangers. They are particularly valuable in older facilities where hot work permits for welding are difficult to obtain, as threaded connections can be made without open flame. Steam tracing manifold systems in insulated process lines rely heavily on threaded flanges for their connections to jacketed piping. In the food processing industry, they are used for high-pressure saturated steam connections to autoclaves and sterilization equipment.

Installation & Service Advantages

  • Weld-Free Assembly: Eliminates the need for hot work permits, making installation safe in hazardous and explosive atmospheres.
  • Quick Disassembly: Threaded connection allows for rapid removal and reinstallation during maintenance without cutting and re-welding pipe.
  • High-Temperature Alloy Strength: F11 and F22 alloy steels maintain mechanical integrity at elevated steam temperatures where carbon steel would creep and fail.
  • Precision Thread Engagement: Tapered NPT threads create a progressive seal as they are tightened, providing a leak-tight joint without additional gaskets in the thread area.

Commercial & Shipping Support

We support payments via T/T and Irrevocable L/C. Alloy steel threaded flanges are stocked in common sizes and classes for immediate delivery to support planned maintenance outages. Each flange is individually protected with plastic thread protectors to prevent thread damage during handling and transit. Packaging is in moisture-resistant cartons or wooden boxes, depending on order size. We provide 3.1 Mill Test Certificates confirming the alloy chemistry and mechanical properties, along with dimensional inspection reports. For power plant and refinery projects, we can provide additional documentation including heat treatment records and hardness test reports to satisfy stringent procurement specifications. Air freight is available for urgent maintenance requirements.

  • Q: Are threaded flanges suitable for Class 900 high-pressure steam service?
  • A: Threaded flanges can be rated for Class 900 and above in smaller sizes, but their use is typically limited by ASME B31.1 and B31.3 to lower pressure classes and smaller bore sizes. Always consult the applicable piping code for your specific application.
  • Q: Should thread sealant be used on alloy steel threaded flanges?
  • A: Yes, a high-temperature compatible thread sealant (e.g., PTFE tape rated for steam service or anaerobic thread compounds) should be applied to ensure a leak-tight seal and prevent galling of the threads during assembly.
Contact form
Contact Us
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 High Pressure Steam Pipeline Systems Alloy Steel Threaded 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.

Related TAG