一、Product Overview

二、Available Material Grades

1. Carbon Steel: 20#, Q235B, Q345B (Q355B), A105, A350 LF2, which are suitable for general industrial pipeline connections with moderate pressure and temperature.
2. Stainless Steel: 304, 304L, 316, 316L, 321, which have excellent corrosion resistance and are suitable for pipelines transporting corrosive media (such as acid, alkali, salt solution) and outdoor harsh environments.
3. Alloy Steel: 15CrMo, 12Cr1MoV, P91, which are suitable for high-pressure, high-temperature pipeline systems (such as thermal power, petrochemical industry), with strong high-temperature resistance and pressure-bearing capacity.
4. Custom Materials: According to the special requirements of the project (such as ultra-high pressure, strong corrosion), customized materials and heat treatment processes can be provided to ensure the service life and safety of the flanges.

三、Main Types & Specifications

（一）Product Types

• Weld Neck Flange: High structural strength, good sealing performance, suitable for high-pressure, high-temperature and large-diameter pipeline systems, and widely used in petrochemical, power and other industries.
• Slip-on Flange: Simple installation, low cost, suitable for medium and low pressure pipelines, easy to disassemble and maintain.
• Socket Weld Flange: Suitable for small-diameter pipelines, compact structure, convenient welding and installation.
• Blind Flange: Used to seal the end of the pipeline, prevent dust, impurities from entering, and can also be used as a temporary blocking component during pipeline maintenance.
• Lap Joint Flange: Convenient for disassembly, suitable for pipelines that need frequent maintenance and inspection.

（二）Specifications

• Nominal Diameter (DN): DN15 - DN1200, covering small, medium and large-diameter pipelines.
• Wall Thickness: Sch10, Sch20, Sch40, Sch80, Sch160, XXS, which can be customized according to the pipeline pressure level.
• Execution Standards: ASME B16.5, ASME B16.11, GB/T 9112-2010, DIN, EN, JIS, ensuring compatibility with international standard pipelines and interchangeability with other pipe fittings.
• Connection Method: Butt weld, socket weld, threaded connection (small diameter), which can be matched with different pipeline installation requirements.

四、Surface & Heat Treatment（表面及热处理）

（一）Surface Treatment（表面处理）

• Common Treatment: Black hot-rolled finish (natural color of steel), sand blasting (rust removal, surface roughness adjustment), anti-rust oil coating (prevent oxidation during storage and transportation).
• Corrosion-Resistant Treatment: Pickling and passivation (for stainless steel flanges), hot-dip galvanizing, electroplating, painting, which can effectively improve the anti-corrosion performance and adapt to outdoor and corrosive environments.
• Surface Requirements: The sealing surface of the flange is smooth, free of burrs, cracks and pores, ensuring tight sealing and avoiding medium leakage.

（二）Heat Treatment

• Routine Heat Treatment: Annealing, normalizing, tempering, which can adjust the hardness and toughness of the flange, eliminate internal stress, and avoid deformation during use.
• Special Heat Treatment: For high-pressure and high-temperature flanges, quenching and tempering processes are adopted to improve the pressure-bearing capacity and high-temperature stability, ensuring that they do not deform or leak under extreme working conditions.

五、Product Advantages

1. High Structural Strength: Integral forging or precision machining, no welding defects, uniform wall thickness, strong pressure resistance, and not easy to crack or deform under high pressure and high temperature.
2. Reliable Sealing Performance: The sealing surface is precision processed, combined with gaskets, which can effectively prevent medium leakage and ensure the tightness of the pipeline system.
3. Convenient Installation: Various connection methods are available, simple operation, quick assembly and disassembly, which can save construction time and cost.
4. Strong Compatibility: Strictly in line with international standards, it can be perfectly matched with steel pipes, valves, pumps and other pipe fittings of the same standard, with strong interchangeability.
5. Customizable Service: Support custom caliber, wall thickness, material, surface treatment and other requirements, and can provide personalized solutions according to the specific needs of the project.
6. Long Service Life: High-quality materials and professional surface treatment, good corrosion resistance and wear resistance, suitable for long-term use in harsh industrial environments.

六、Application Fields

• Petrochemical Industry: Used for connecting oil and gas transmission pipelines, chemical reaction equipment, and corrosive medium pipelines.
• Power Industry: Applied to thermal power plants, nuclear power plants, connecting boilers, condensers, and high-pressure steam pipelines.
• Municipal Engineering: Used for water supply and drainage pipelines, heating pipelines, and urban gas transmission pipelines.
• Shipbuilding & Marine Industry: Suitable for marine pipeline systems, with strong corrosion resistance to seawater.
• Other Fields: Metallurgy, mining, pharmaceutical, food processing, and other industries that require pipeline connection, sealing and disassembly.