Hot Finished Seamless Carbon Steel Pipe – ASTM A53 Grade A and B

What is ASTM A53 Seamless Steel Pipe?

ASTM A53 pipe is a hot finished seamless carbon steel pipe widely used for low pressure applications like water, steam, and air lines. It is manufactured as per ASTM A53 standards which define requirements for chemical composition, mechanical properties, and tolerances.

What are ASTM A53 Grade A and B Pipe?

ASTM A53 specifies two grades – Grade A with higher tensile strength and Grade B with equivlalent mechanical properties as A36 steel. Grade A pipe has a minimum yield strength of 30,000psi while Grade B yields at 24,000psi. Both grades have excellent pressure containing capability.

Why Purchase Seamless Steel Pipe?

Seamless pipe offers superior pressure handling capability compared to welded pipe as it has no longitudinal welds. Without a weld seam, it has uniform strength throughout and is less prone to corrosion or cracking. This makes it suitable for low pressure applications involving water, air, steam, oil and gas.

A53 black steel pipe
A53 black steel pipe

Manufacturing Process of ASTM A53 Pipe

A53 pipe is produced by hot forming/extrusion of cylindrical billets in piercers or extruders without any welding. The continuous tube is sized, tested and cut to required lengths. This seamless forming develops a uniform microstructure and isotropic properties through the cross-section.

Dimensional Specs and Tolerances

Outside diameters typically range from 1/8″ to 6″ in various schedular weights. Standard lengths are 20′ with smaller random lengths also available. Wall thicknesses are as per schedule tables with tolerances specified in the standard. Ends may be beveled, threaded or plain as per application demands. View the specification table

Equivalent Designation

DIN 17175 Grade St 35-8NFAA 49-215 Grade TU 37-cASTM A53 Grade AASME SA 53 Grade A
Equivalent Designation Table

Chemical composition

  • Carbon: Max 0.30%
  • Manganese: 1.30% max
  • Phosphorus: 0.040% max
  • Sulfur: 0.050% max
Yield StrengthTensile StrengthElongation A5 min
MPa minksi minMPa minMPa minksi minPercentage
Mechanical Properties


  • Water pipelines, supply and distribution
  • Industrial piping for steam, air, gases etc
  • Irrigation systems, sprinklers
  • Hydraulic and pneumatic cylinders
  • General plumbing and fixture connections
  • Low pressure oil and gas piping

Testing Standards

A53 pipe undergoes hydrostatic and flattening tests as per ASTM standards to ensure quality. UOE mill test reports are provided detailing chemical analysis, pressure tests, dimensions. Proper handling, storage and installation is important for design life and leakproof jointing.

A53 steel Pipe We Supply

Shangang Steel supplies A53 seamless pipes of different specifications to meet the different needs of customers. Usually, the grades of pipe include A53 Grade A and A53 Grade B. Please view the seamless pipe specification table we supply here. A53 seamless pipe lengths can be customized to meet the needs of your specific project.

We usually provide hot-dip galvanized and black surface treated A53 seamless pipes. Hot-dip galvanizing provides additional protection against corrosion and is suitable for outdoor and weather-resistant environments. We are able to provide A53 seamless pipes that meet relevant standards and certification requirements. This includes chemical composition analysis, mechanical property testing and other quality control steps performed by specialized laboratories.

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