Large-diameter steel pipe flange

Large-Diameter Steel Pipe Flange is a heavy-duty pipe connection component designed for large-bore pipelines , complying with international standards (ANSI/ASME, GB, DIN) and engineered for high-pressure, high-flow industrial systems.

Description

Core Advantages

  • Robust construction (integral forging or segmented welding) ensures exceptional structural strength and pressure-bearing capacity, adapting to large-diameter pipeline stress requirements.
  • Precision machining of sealing faces (RF, RTJ, etc.) guarantees tight sealing, preventing leakage in high-pressure/high-flow media transmission.
  • Multiple material options (carbon steel, stainless steel, alloy steel) offer strong corrosion resistance and adaptability to diverse media (oil, gas, chemicals, etc.).
  • Complies with global standards for high interchangeability, enabling seamless integration with large-scale international pipeline projects and equipment.

Application Scenarios

Widely used in oil & gas long-distance transmission, petrochemical large-scale plants, municipal water supply and drainage (large flow), power plant steam pipelines, and offshore engineering. It reliably connects large-diameter pipes carrying crude oil, natural gas, industrial wastewater, steam, and other media, suitable for high-pressure, large-flow, and critical pipeline connection scenarios.

Additional information

Size

DN650, DN700, DN750, DN800, DN850, DN900, DN950, DN1000, DN1050, DN1100, DN1150, DN1200, DN1250, DN1300, DN1350DN1400, DN1450, DN1500

nominal pressure

PN20(Class150), PN50(Class300), PN100(Class600), PN150(Class900)

Material

Carbon Steel: ASTM A105, 20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70;
Stainless Steel: ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8;

Production Standards

National Standard (GB): GB/T9112-2000 (GB9113·1-2000 ~ GB9113·4-2000)
Marine Standard: GB/T10747-89
American Standard (ANSI): ANSI B16.5 Class150, 300, 600, 900, 1500 (WN, SO, BL, TH, LJ, SW)
Japanese Standard (JIS): JIS 5K, 10K, 16K, 20K (PL, SO, BL, WN, TH, SW)
German Standard (DIN): DIN2573, 2572, 2631, 2576, 2632, 2633, 2543, 2634, 2545 (PL, SO, WN, BL, TH)
Ministry of Chemical Industry Standard (HG): HG5010-52 ~ HG5028-58, HGJ44-91 ~ HGJ65-91, HG20592-97 Series, HG20615-97 Series
Ministry of Machinery Industry Standard (JB): JB81-94 ~ JB86-94, JB/T79-94 ~ JB/T86-94, JB/T74-1994
Pressure Vessel Standard: JB1157-82 ~ JB1160-82, JB4700-2000 ~ JB4707-2000, B16.47A/B, B16.39, B16.48