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ASTM A182 F55 UNS S32760 Duplex Steel Weld Neck Flange RTJ EN 1.4501 X2CrNiMoCuWN25-7-4
ASTM A213 TP321H bright seamless tube is a special type of pipe designed to solve the dual challenges of "high-temperature strength" and "corrosion resistance."
Its most precise application is in critical heat exchange equipment in petrochemical, power plant boiler, and other fields requiring high temperature, high pressure, and strict resistance to intergranular corrosion, especially in operating conditions above 540°C where the equipment may face "wet-dry alternation" or corrosive condensate generation.
The following are its core application scenarios and reasons for choosing it:
The "H" in TP321H represents the high-temperature grade. Unlike ordinary 321 stainless steel with a carbon content ≤0.08%, 321H has a carbon content controlled within a higher range of 0.04-0.10%, ensuring higher creep rupture strength and endurance strength at high temperatures. Simultaneously, the addition of titanium as a stabilizing element enables it to resist intergranular corrosion.
Bright annealing treatment results in a smooth, oxide-free inner and outer surface with a high degree of surface finish. For heat exchange tubes, the inner wall is smoother, the resistance to medium flow is smaller, and it is less prone to scaling.
ASTM A182 F55Chemical Composition
Element
Composition (% by weight)
Carbon (C)
0.030 max
Manganese (Mn)
1.00 max
Phosphorus (P)
0.035 max
Sulfur (S)
0.020 max
Silicon (Si)
1.00 max
Chromium (Cr)
24.0 – 26.0
Nickel (Ni)
6.0 – 8.0
Molybdenum (Mo)
3.0 – 4.0
Copper (Cu)
0.50 – 1.00
Tungsten (W)
0.50 – 1.00
Nitrogen (N)
0.20 – 0.30
Iron (Fe)
Balance
ASTM A182 F55 Mechanical Properties
Property
Value
Tensile Strength
860 MPa (125 ksi) min
Yield Strength (0.2% offset)
655 MPa (95 ksi) min
Elongation (in 2 inches or 50 mm)
16% min
Reduction of Area
50% min
Hardness
≤ 28 HRC (Rockwell C)
Impact Toughness
Typically 100J+ at -46°C (often specified for critical services)
Application:
Marine Engineering: Such as offshore oil platforms and subsea pipeline systems, used for processing mixtures of seawater and crude oil.
Oil and Gas: Particularly suitable for wellhead equipment, pipelines, and processing facilities in acidic oil and gas fields containing hydrogen sulfide (H₂S).
Chemical Processing Industry: Used for reactors, heat exchangers, and pipeline connections for processing highly corrosive media such as organic or inorganic acids containing chlorides.
Seawater Desalination Plants: Used for connecting seawater-resistant pipelines and equipment in high-pressure reverse osmosis or distillation seawater desalination processes.
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
