What is ASTM A210 Grade A1 Tube?

ASTM A210 Grade A1 is a seamless tube made of medium-carbon steel. It follows the ASTM A210/A210M standard for boilers. These tubes stay strong under high temperatures.

SA210 A1 material uses a minimum wall thickness design. This keeps the strength even. The carbon stays at 0.27% or less. This makes it a medium-carbon steel tube. It works well when exposed to high heat.

The tube is P-Number 1 (P1) for welding. You can get them hot-finished or cold-finished. Cold tubes need heat treatment later.

ASTM A210 Grade A1 Tube Specifications

ASTM A210 Grade A1 tube specification covers the technical requirements for seamless boiler and superheater tubes.

Feature Detail
Standard ASTM A210/A210M, ASME SA210
OD Range 1/2" to 5" (12.7mm to 127mm)
Wall Thickness 0.035" to 0.500" (0.9mm to 12.7mm)
Schedules SCH20, SCH30, SCH40, STD, XH, SCH80, SCH100, SCH120, SCH140, SCH160, XXH
Length Single Random, Double Random, Cut Length (max 25m)
End Types Plain End, Bevelled End, Threaded
Surface Finish Black, Varnished, Oiled, Pickled, Shot Blasted
Manufacture Hot-finished, Cold-finished

For complete specification data, refer to ASTM A210/A210M standard document.

ASTM A210 Grade A1 Chemical Composition

The chemical composition keeps the tube strong and easy to weld.

Element %
Carbon (C) 0.27% max
Manganese (Mn) 0.93% max*
Phosphorus (P) 0.035% max
Sulphur (S) 0.035% max
Silicon (Si) 0.10% min

If carbon is lower than the max, manganese can go up to 1.35%. Check the ASTM A210 document for the full list.

ASTM A210 Grade A1 Mechanical Properties

A210 Grade A1 mechanical properties meet the requirements for high-pressure boiler and superheater service.

Property Value
Tensile Strength (min) 415 MPa (60,000 psi)
Yield Strength (min) 255 MPa (37,000 psi)
Elongation in 2" (min) 30%
Hardness (max) 79 HRB / 143 HB

Small tubes with a tiny diameter do not have to meet these mechanical rules. For complete SA210 A1 tensile strength and A210 A1 hardness data, refer to ASTM A210 specification.

ASTM A210 Grade A1 Equivalent Standards

ASTM A210 Grade A1 tubes have equivalent designations in international standards systems:

Standard Equivalent
ASTM A210 Gr.A1 ASME SA210 Gr.A1
DIN 17175 St35.8
EN 10216-2 P235GH
BS 3059 Grade 320
IS 1239 -

ASTM A210 Grade A1 Tube Size Chart

A210 Gr A1 tube dimensions cover a wide range of sizes for various boiler applications:

OD Range 12.7mm to 127mm (1/2" to 5")
Wall Thickness As per schedule or specified MWT
Standard Schedules SCH20 through XXH
Weight Calculated per meter/foot based on OD and wall

For complete SA210 A1 tube size chart, contact us with your specific requirements.

ASTM A210 Grade A1 Heat Treatment

A210 Grade A1 heat treatment requirements depend on the manufacturing process:

Hot-finished tubes: No heat treatment required.

Cold-finished tubes: Must be given one of the following heat treatments after final cold finishing:

  • Subcritical anneal
  • Full anneal
  • Normalising heat treatment

Heat treatment relieves internal stresses and restores mechanical properties for boiler tube annealing requirements.

IBR Approved ASTM A210 Grade A1 Boiler Tubes

You must have IBR certification for boilers in India. The Indian Boiler Regulation (IBR) makes sure everything is safe. We provide Form 3A/3D papers. Every tube has a paper trail. Government-approved agencies do the checks. We follow every IBR rule.

Difference Between ASTM A210 Grade A1 and Grade C

A210 Grade A1 vs Grade C: The main difference lies in carbon content, which affects strength and hardness.

Property Grade A1 Grade C
Carbon 0.27% max 0.35% max
Tensile Strength 415 MPa min 485 MPa min
Yield Strength 255 MPa min 275 MPa min
Hardness 79 HRB / 143 HB max 89 HRB / 179 HB max

Select Grade A1 for standard boiler service. Choose Grade C when higher strength requirements justify the increased hardness and welding considerations.

ASTM A210 Grade A1 Tube Applications

A210 Gr A1 tube applications span multiple industries requiring high-temperature, high-pressure boiler tubes. These boiler tubes find applications in the following industries.

Power Generation Plants

Steam boilers, water-tube boilers, fire-tube boilers, and superheater sections in thermal and nuclear power stations use these tubes for steam generation. The tubes handle high pressure and temperature conditions essential for efficient power production.

Chemical & Petrochemical Industries

Process heaters, heat exchangers, reboilers, and waste heat recovery systems use superheater tube products to handle high-temperature process fluids safely in chemical processing operations.

Fertilizer Plants

Ammonia plant boilers, synthesis gas heaters, and steam generation systems for urea production depend on these tubes for reliable operation under demanding conditions.

Sugar Mills

Bagasse-fired boilers, juice heaters, evaporator systems, and steam distribution networks in sugar processing facilities use A210 Grade A1 tubes.

Paper & Pulp Industries

Recovery boilers, power boilers, steam systems for drying sections, and black liquor recovery systems specify these tubes for critical steam generation applications.

Cement Plants

These tubes are used in waste heat recovery boilers, preheater systems, and steam generation for power requirements.

Heat Exchangers & Condensers

Shell and tube heat exchangers, surface condensers, economisers, and air preheaters use A210 Grade A1 tubes.

Quality Testing & Certification

As per ASTM A210/A450, the following tests are mandatory:

  • Tension Test: One test for lots up to 50 tubes; two tests for larger lots.
  • Flattening Test: One test from each end of one finished tube from each lot.
  • Flaring Test: One test from each end of one finished tube.
  • Hardness Test: Brinell or Rockwell hardness tests on specimens from two tubes.
  • Hydrostatic Test: Each tube is subjected to hydrostatic pressure test or NDT as specified.

Available certifications and documentation:

  • IBR Certification (Form 3A/3D)
  • Govt. Lab Test Certificate (NABL Approved)
  • EN 10204/3.1B Material Test Certificate (MTC)
  • Third Party Inspection Report (TPI)
  • 100% Radiography Test Report
  • Ultrasonic Test Report
  • PMI (Positive Material Identification)

Frequently Asked Questions

  • What is ASTM A210 Grade A1 used for?

    It is for boilers and superheaters. It handles high heat. Apart from that, it works well in power plant systems.

  • What is the difference between SA210 A1 and SA210 C?

    SA210 Grade C has higher carbon content (0.35% max vs 0.27% max), higher tensile strength (485 MPa vs 415 MPa), and higher hardness limits (89 HRB vs 79 HRB) compared to SA210 Grade A1. Grade C is used for higher strength requirements.

  • What is the P number for SA210 A1?

    The P number for SA210 A1 is 1.

  • Is ASTM A210 Grade A1 suitable for high temperature service?

    Yes, ASTM A210 Grade A1 is specifically designed for high-temperature service in boilers and superheaters. It can handle elevated temperatures encountered in steam generation systems.

  • What is the hardness limit for A210 Grade A1?

    The maximum hardness for ASTM A210 Grade A1 tubes is 79 HRB (Rockwell B) or 143 HB (Brinell Hardness).