ASME SA213 TP347 Shell And Tube Heat Exchanger Stainless Steel Seamless Tubes

ASME SA213/ASTM A213 This specification covers seamless ferritic and austenitic steel boiler, superheater, and heat-exchanger tubes, designated Grades T5, T9, T11, T22, TP304, TP316L,TP321, TP347 etc.TP347 seamless tubes, tubes of this material describe a high-performance, corrosion-resistant tubes made from a special grade of stainless steel, specifically designed for use in the high-pressure and high-temperature sections of Shell and Tube Heat Exchangers.

Chemical Composition (%) max

Carbon: 0.08

Manganese: 2.00

Phosphorus: 0.045

Sulfur: 0.030

Silicon: 1.00

Chromium: 17.0-20.0

Nickel: 9.0-13.0

Titanium: 10×C-1.10

Mechanical Properties

TP347 Austenitizing/Solutioning Temperature,min or range : 1900 °F [ 1040°C ]

TP347 Tensile Strength, min. : 75ksi [ 515MPa ] ; Yield Strength, min.: 30ksi [ 205MPa ]

TP347 Elongation in 2 in. or 50mm, min.: 35% ; Brinell/Vickers: 192HBW/200HV ; Rockwell: 90HRB

Advantages

TP347 is an austenitic stainless steel known for its addition of Niobium (Columbium).The Niobium acts as a "stabilizer." It preferentially combines with Carbon, preventing the formation of Chromium Carbides along the grain boundaries when the metal is heated to a specific temperature range (sensitization). This makes it highly resistant to intergranular corrosion.

TP347 has higher pressure integrity (no weak seam); more uniform strength and structure around the circumference; better reliability in high-pressure and high-temperature services; less prone to corrosion at a potential weld line.

Applications

Oil & Gas / Refining Projects : Heat exchangers in catalytic reforming units, hydrocrackers, and other processes involving corrosive streams.

Nuclear Power: In certain auxiliary heat exchange systems.

Power Plants: Common in boilers, superheaters / reheaters, and heat exchangers.

Chemical Processing: Handles corrosive fluids and high-pressure steam, for heating or cooling aggressive chemicals..

Why Specify ASME SA213 TP347 usually for Heat Exchanger?

ASME SA213/ASTM A213 This specification usually for high-pressure and high-temperature services, such as boiler, superheater, and heat-exchangers. And TP347 maintains its strength at elevated temperatures better than standard grades like TP304 or TP316L.

TP347 can chloride stress corrosion cracking (CSCC) resistance: While not as resistant as a duplex stainless steel, its niobium stabilization offers some improvement over non-stabilized grades.

If the heat exchanger will operate, or even be shut down, in a temperature range that causes "sensitization" (425–815°C / 800–1500°F), TP347 is an excellent choice to prevent this specific failure mode.Involve risk of intergranular corrosion.