ASTM A334 Seamless Tube

AttributeDescription
Product NameASTM A334 Seamless Tube
StandardASTM A334
GradeGrade 1, Grade 3, Grade 6, Grade 7, Grade 8, Grade 9, Grade 11
TypeSeamless (Hot Finished)
MaterialLow Carbon Steel
Outside Diameter (OD)1/2" to 26"
Wall ThicknessSCH 10, SCH 20, SCH 30, STD, SCH 40, SCH 60, SCH 80, XS, SCH 100, SCH 120, SCH 140, SCH 160, XXS
Length6m, 12m, or as required
CertificationISO 9001, API 5L, CE
Categories: ,

Description

Product Description ASTM A334 Seamless Tube

ASTM A334 is a standard specification for seamless and welded carbon and alloy steel tubes designed specifically for low-temperature service. These tubes are highly valued across various industries for their exceptional strength, durability, and ability to withstand low-temperature environments. This comprehensive guide explores the features, specifications, applications, and benefits of ASTM A334 carbon steel seamless tubes.

ASTM A334 Seamless Tube Dimensions

Nominal Size (inches)Outer Diameter (OD) (mm)Wall Thickness (WT) (mm)Length
1/4"13.721.656m / Custom
3/8"17.151.656m / Custom
1/2"21.342.116m / Custom
3/4"26.672.116m / Custom
1"33.402.776m / Custom
1 1/4"42.162.776m / Custom
1 1/2"48.262.776m / Custom
2"60.333.386m / Custom
2 1/2"73.033.686m / Custom
3"88.903.916m / Custom
3 1/2"101.604.196m / Custom
4"114.304.506m / Custom
5"141.305.166m / Custom
6"168.285.496m / Custom

ASTM A334 Chemical Composition

ElementGrade 1Grade 6
Carbon (C)0.30 max0.30 - 0.61
Manganese (Mn)0.40 - 1.060.29 - 1.06
Phosphorus (P)0.025 max0.025 max
Sulfur (S)0.025 max0.025 max
Silicon (Si)0.10 min0.10 min

ASTM A334 Mechanical Properties

GradeTensile Strength (MPa)Yield Strength (MPa)Elongation (%)
Grade 1380-550205 min30 min
Grade 6415-585240 min30 min

Manufacturing Process

The seamless manufacturing process ensures uniformity and superior quality in ASTM A334 tubes. The process involves:

  1. Selection of Raw Material: High-quality billets or blooms are selected based on the required grade.
  2. Hot Rolling: The raw material is heated and passed through rolling mills to achieve the desired size and shape.
  3. Piercing and Sizing: A piercing rod creates the hollow section, and further sizing operations ensure precise dimensions.
  4. Heat Treatment: Heat treatment processes like annealing or normalizing enhance ductility and toughness.
  5. Testing and Inspection: Tubes undergo rigorous testing, including tensile testing, impact testing, and non-destructive testing (NDT), to ensure compliance with ASTM standards.

Grades of ASTM A334 Tubes

ASTM A334 tubes are available in multiple grades, each tailored for specific applications. Common grades include:

  1. Grade 1: Standard carbon steel with good mechanical properties.
  2. Grade 6: Enhanced manganese content for improved toughness and strength.
  3. Grade 7: Similar to Grade 6 with additional silicon for enhanced performance.

Benefits of Using ASTM A334 Carbon Steel Seamless Tubes

  1. Reliability in Extreme Conditions: Designed to perform in sub-zero temperatures without compromising structural integrity.
  2. Versatility: Suitable for a wide range of industrial applications.
  3. Cost-Effective: Offers an excellent balance between performance and cost compared to alternative materials.
  4. Customizability: Available in various sizes, wall thicknesses, and grades to meet specific project requirements.

Testing Standards

To ensure quality and performance, ASTM A334 tubes are subjected to stringent testing protocols, including:

  1. Hydrostatic Testing: Ensures the tube can withstand the required pressure without leakage.
  2. Tensile Testing: Verifies mechanical properties like tensile and yield strength.
  3. Impact Testing: Confirms the tube’s toughness at low temperatures.
  4. Dimensional Inspection: Checks for adherence to specified dimensions and tolerances.
  5. Non-Destructive Testing (NDT): Includes ultrasonic and radiographic testing to detect internal flaws.

Surface Finish

The surface finish of ASTM A334 tubes is critical for certain applications. Options include:

  1. Bare: Standard finish with no additional coatings.
  2. Galvanized: Provides enhanced corrosion resistance.
  3. Polished: For aesthetic and functional purposes in specific applications.

Conclusion

ASTM A334 seamless tubes are specifically designed for low-temperature applications, offering robust performance in environments where temperatures can reach extremely cold conditions. Available in grades 1 and 6, these tubes are manufactured to meet ASTM standards, ensuring high reliability, durability, and resistance to corrosion.

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