ASTM A334 Grade 6 Seamless Tube for Heat Exchanger
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ASTM A334 Grade 6 seamless carbon steel pipe is designed for low-temperature applications such as heat exchangers, condensers, and boilers, offering good strength, ductility, and impact resistance at cryogenic temperatures.
ASTM A334 Grade 6 seamless pipe steel has a specific chemical composition, including carbon, manganese, phosphorus, sulfur, and silicon, and undergoes rigorous mechanical testing and heat treatment (typically normalizing) to meet these cryogenic performance requirements.
Key Characteristics of ASTM A334 Grade 6 Seamless Tube for Heat Exchanger
Low-Temperature Resistance: The primary advantage of A334 Grade 6 tubes is their ability to withstand extremely low temperatures without becoming brittle. This characteristic is crucial in industries such as oil and gas, where materials are often exposed to frigid conditions.
Strength and Durability: With a minimum yield strength of approximately 35,000 psi, A334 Grade 6 tubes can handle significant stress, making them suitable for high-pressure applications.
Weldability: The chemistry of A334 Grade 6 allows for good weldability, which is a critical feature in manufacturing and assembly processes.
ASTM A334 grade 6 seamless tube specificstion
Grade: ASTM A334 grade 1, 3, 6, 7, 8, 9
Type: Seamless – Hot Rolled / Cold Drawn
Size range:OD: 9.53mm – 127mm WT: 1 – 12mm
Length:6000mm or customized length
Application: Boiler, Heat exchanger, condenser, preheater, etc
Chemical Composition for ASTM A334 Grade 6 Carbon Steel Seamless Tubes
| Grade | Mfg. Process | Chemical composition(%) | ||||||
| C | Si | Mn | P | S | Ni | Others | ||
| Grade 1 | S, E, AT | 0.30Max | - | 0.40~1.06 | 0.05Max | 0.60Max | - | (STBL450) |
| Grade 3 | S, E, AT | 0.19Max | 0.18~0.37 | 0.31~0.64 | 0.05Max | 0.050Max | 3.18-3.82 | - |
| Grade 6 | S, E, AT | 0.30Max | 0.10Max | 0.29~1.06 | 0.048Max | 0.058Max | - | - |
| Grade 7 | S, E, AT | 0.19Max | 0.13~0.32 | 0.90Max | 0.04Max | 0.050Max | 2.03~2.57 | (STBL690) |
Mechanical Properties for ASTM A334 Grade 6 Carbon Steel Seamless Tubes
| Grade | Tensile Test MPa or N/mm2 | Remaks (Similar to JIS) |
|
| Min Yield point | Tensile Strength | ||
| Gr. 1 | 205 | 380Min | Impact Test(J) 2V 18 |
| Gr. 3 | 240 | 450Min | 2V 18 |
| Gr. 6 | 240 | 415Min | 2V 18 |
| Gr. 7 | 240 | 450Min | 2V 18 |
Application
Oil and Gas Pipelines: Used in transporting crude oil and natural gas, especially in colder regions where low-temperature properties are vital.
Pressure Vessels: Essential for constructing pressure vessels that operate efficiently in low-temperature settings.
Heat Exchangers: Utilized in heat exchangers where thermal efficiency and durability are paramount.
Cryogenic Facilities: Applied in systems designed to handle liquefied gases near their boiling points.
ASTM A334 grade 6 seamless pipe Manufacture: the tubes shall be made by the seamless process and shall be either hot-finished or cold-finished, as specified.
Heat Treatment: all seamless tubes shall be treated to control their microstructure in accordance with one of the following methods:
a: Normalize by heating to a uniform temperature of not less than 1550°F [845°C] and cool in air or in the cooling chamber of an atmosphere controlled furnace.
b: Reheat and control hot working and the temperature of the hot-finishing operation to a finishing temperature range from 1550 to 1750°F [845 to 955°C] and cool in a controlled atmosphere furnace from an initial temperature of not less than 1550 °F [845°C].
Inspection & Test: chemistry composition analysis, tension test, flattening test, flaring test, hardness test, impact test, NDT, surface inspection and dimension check.
