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ASME SA210 Gr A1 Carbon Steel Tubes Supplier in India

Seamless SA 210 Grade A1 Boiler & Superheater Tubes

SA210 Gr A1 is seamless medium-carbon steel tube for boiler and superheater tubes (ASTM A210 / ASME SA-210): 0.27% carbon max, 415 MPa minimum tensile strength and 79 HRB maximum hardness, supplied hot-finished or cold-finished. Its closest equivalents are EN 10216-2 P265GH and JIS G3461 STB 410.

Dinesh Tube India supplies ASME SA210 A1 carbon steel tubes (ASTM A210 Grade A-1) from Mumbai to boiler makers, power plants, EPC contractors and maintenance teams in India and overseas. SA210 Gr A1 is a seamless medium-carbon steel tube made for boiler tubes, boiler flues, superheater tubes, safe ends, and arch and stay tubes. It is stronger than low-carbon boiler tube grades, so designers can use a thinner wall for the same pressure.

We supply SA 210 Gr A1 tubes from 12.7 mm to 127 mm OD, hot-finished or cold-finished, with an EN 10204 3.1 mill test certificate. We also supply the higher-strength SA210 Grade C. Send us your OD, minimum wall, length and quantity for a quote.


Table of Contents


What Is SA210 Gr A1 Material?

SA210 is the ASME designation of ASTM A210/A210M, the standard specification for seamless medium-carbon steel boiler and superheater tubes. It covers two grades, A-1 and C, in sizes from 1/2 in. to 5 in. (12.7 to 127 mm) OD and 0.9 to 12.7 mm minimum wall. The steel must be killed, and tubes are made only by the seamless process, either hot-finished or cold-finished. General requirements for tolerances, testing and marking come from ASTM A450/A450M.

Grade A1 is a carbon-manganese steel with 0.27% carbon maximum and at least 0.10% silicon. It has a minimum tensile strength of 415 MPa (60 ksi), compared with 325 MPa for low-carbon SA192 boiler tubes. SA210 A1 tubes must also take expanding, beading, forging, welding and bending in the boiler shop without defects, so they suit water-wall panels, economisers and superheater coils.

ASME SA210 Gr A1 seamless carbon steel boiler tubes

Specification sheet: Download SA 210 / ASTM A210 Tube Specification (PDF)

Edition record: the current ASTM edition is A210/A210M-26 (issued April 2026). The values on this page and in our PDF sheet (Rev. 1) were reviewed against it on 4 November 2026. Always order to the edition named in your boiler code or purchase specification.


SA 210 Gr A1 Material Specification

Standard

ASTM A210/A210M (current edition A210/A210M-26), ASME SA210/SA210M

Grades

A-1 (A1) and C

Outside Diameter

12.7 mm – 127 mm (1/2" – 5")

Wall Thickness

0.9 mm – 12.7 mm (minimum wall)

Manufacturing Process

Seamless, hot-finished or cold-finished

General Requirements

ASTM A450/A450M

Length

Single random, double random, cut length as required

Ends

Plain end, square cut; bevelled on request

Certification

EN 10204 3.1 MTC; third-party inspection on request

Value-Added Services

Cutting to length, bevelling, ultrasonic and eddy current testing
SA210 Gr A1 tube specification

SA210 Gr A1 Chemical Composition (%)

GradeCarbon (C)Manganese (Mn)Phosphorus (P)Sulphur (S)Silicon (Si)
SA210 A10.27 max0.93 max0.035 max0.035 max0.10 min

For each 0.01% of carbon below the maximum, an extra 0.06% manganese above the maximum is allowed, up to 1.35% Mn.

SA210 A1 Mechanical Properties

Tensile Strength (min)Yield Strength (min)Elongation in 50 mm (min)Hardness (max)
415 MPa (60 ksi)255 MPa (37 ksi)30%79 HRB (143 HB)

SA210 Grade A1 vs Grade C

SA210 Grade C is the higher-strength grade in the same specification. It is often used for boiler and superheater tubes where the design calls for higher allowable stress. We supply both grades. Order the grade shown on the boiler drawing: A1 and C are not interchangeable without the boiler designer's approval.

PropertySA210 A1SA210 C
Carbon0.27% max0.35% max
Manganese0.93% max0.29 – 1.06%
Phosphorus / Sulphur0.035% max each0.035% max each
Silicon0.10% min0.10% min
Tensile strength (min)415 MPa (60 ksi)485 MPa (70 ksi)
Yield strength (min)255 MPa (37 ksi)275 MPa (40 ksi)
Elongation (min)30%30%
Hardness (max)79 HRB89 HRB

SA 210 Gr A1 Equivalent Grades

StandardSA210 A1 Comparable GradeSA210 C Comparable Grade
UNSK02707K03501
EN 10216-2P265GH—
DIN 17175St 45.8—
JIS G3461 (Japan)STB 410STB 510

These are the closest comparable grades, not exact equivalents. Check your design code before substituting one for another.

Heat Treatment & Testing

Hot-finished SA210 tubes do not need heat treatment. Cold-finished tubes are heat treated after the final cold draw by subcritical annealing, full annealing or normalizing. Tubes are then tested as required by ASTM A210 and A450:

  •   Tension test: tensile, yield and elongation
  •   Flattening test: checks ductility without cracks
  •   Flaring test: tube end flared without cracking
  •   Hardness test: 79 HRB maximum for Grade A1
  •   Hydrostatic or eddy current test: every tube, per A450
Tube ODHydrostatic Test Pressure (max)
Under 25.4 mm (1")7 MPa (1,000 psi)
25.4 – under 38.1 mm (1" – 1½")10 MPa (1,500 psi)
38.1 – under 50.8 mm (1½" – 2")14 MPa (2,000 psi)
50.8 – under 76.2 mm (2" – 3")17 MPa (2,500 psi)
76.2 – 127 mm (3" – 5")24 MPa (3,500 psi)

Test pressure is calculated as P = 32,000 t/D (psi), limited to the maximums above.

SA210 Dimensional Tolerances (ASTM A450)

Outside DiameterOD Tolerance (cold-finished)Wall Tolerance (cold-finished)
Under 25.4 mm (1")± 0.10 mm+20% / −0 (min wall)
25.4 – 38.1 mm (1" – 1½")± 0.15 mm+20% / −0 (min wall)
Over 38.1 – under 50.8 mm (1½" – 2")± 0.20 mm+22% / −0 (min wall)
50.8 – under 63.5 mm (2" – 2½")± 0.25 mm+22% / −0 (min wall)
63.5 – under 76.2 mm (2½" – 3")± 0.30 mm+22% / −0 (min wall)
76.2 – 101.6 mm (3" – 4")± 0.38 mm+22% / −0 (min wall)
Over 101.6 – 127 mm (4" – 5")+0.38 / −0.64 mm+22% / −0 (min wall)

The table above is for cold-finished tubes. Hot-finished tubes have wider tolerances; see the next section.

Hot-Finished vs Cold-Finished SA210: What to Specify

ASTM A210 tubes are made seamless and supplied hot-finished or cold-finished, as specified in the order. The finish changes the heat treatment, the tolerance basis and the surface, so state it in every enquiry.

ItemHot-finished (HF)Cold-finished (CF)
ProcessPierced and hot rolled to sizeCold drawn to size from a hot-finished hollow
Heat treatment (A210)Not requiredSubcritical anneal, full anneal or normalise after the final cold finishing
OD tolerance (A450)+0.4 / −0.8 mm up to 101.6 mm OD±0.10 to ±0.38 mm by OD (table above)
Minimum-wall tolerance (A450)+28% to +40% / −0, wider for thinner walls+20% / −0 up to 38.1 mm OD; +22% / −0 above
Surface and dimensionsMill-scale surface, wider tolerancesSmoother surface, closer OD and wall
Typical choiceLarger OD and heavier walls where wider tolerances are acceptableSmaller OD and thinner walls, and tubes expanded into drums or headers

Hot-finished minimum-wall tolerance by wall thickness: up to 2.4 mm +40%; over 2.4 to 3.8 mm +35%; over 3.8 to 4.6 mm +33%; over 4.6 mm +28% (all −0). Confirm against the A450 edition named in your order.

SA210 A1 Tube Sizes

Typical boiler tube sizes are listed below. Any OD from 12.7 to 127 mm and minimum wall from 0.9 to 12.7 mm can be quoted on request.

OD (mm)OD (inch)Typical Wall Thickness (mm)
25.41"2.6 – 4.0
31.81¼"2.9 – 4.0
38.11½"3.2 – 4.5
44.51¾"3.2 – 5.0
50.82"3.2 – 5.6
57.12¼"3.6 – 5.6
63.52½"3.6 – 6.3
76.23"4.0 – 7.1
88.93½"4.5 – 8.0
101.64"5.0 – 10.0
114.34½"5.6 – 11.0
127.05"6.3 – 12.7

How to Order SA210 Tubes: RFQ Example

A complete enquiry lets us quote in one round. This is a typical SA210 request for boiler tubes; replace the values with your own.

ItemExample
SpecificationASME SA-210 / ASTM A210/A210M (state the edition if your code requires one)
GradeA-1 (or C, only if the boiler drawing calls for it)
Finish & heat treatmentCold-finished, normalised after the final cold draw (or hot-finished)
Size50.8 mm (2") OD × 4.0 mm minimum wall
Length & quantity6,000 mm cut length, 300 tubes
EndsPlain square cut, or bevelled (state angle)
TestingHydrostatic or eddy current test on every tube (A450); tension, flattening, flaring and hardness tests per A210
DocumentsEN 10204 3.1 mill test certificate; IBR or other boiler-code documentation and third-party inspection if required
Marking, packing & deliveryMarking per A450; bundles with end caps; delivery address and required date

Send your SA210 RFQ in this format to kamlesh@dineshtube-india.com, call or WhatsApp +91 83559 10913, or through our enquiry form. Retubing a boiler? Use our boiler retubing enquiry checklist.

Need SA210 A1 or SA210 C boiler tubes? Send your OD, minimum wall, length and quantity to kamlesh@dineshtube-india.com or call +91 83559 10913. You can also send an enquiry.

Types of SA210 A1 Tubes

SA210 A1 seamless carbon steel tubes

SA210 A1 Seamless Tubes

Hot-finished or cold-finished seamless medium-carbon tubes, 12.7–127 mm OD.
SA210 A1 carbon steel boiler tubes

SA210 A1 Boiler & Superheater Tubes

For water walls, economisers and superheater coils. See all boiler tubes.

SA210 vs SA192, SA179, SA178 & SA214

GradeProcessCarbonMin TensileMain Use
SA210 A1Seamless0.27% max415 MPaBoiler & superheater tubes, 1/2"–5" OD
SA210 CSeamless0.35% max485 MPaHigher-strength boiler & superheater tubes
SA192Seamless0.06–0.18%325 MPaHigh-pressure boiler tubes, 1/2"–7" OD
SA179Seamless, cold drawn0.06–0.18%325 MPaHeat exchangers & condensers, up to 3" OD
SA178ERW (welded)Grade dependentGrade dependentBoiler tubes, flues, safe ends
SA214ERW (welded)0.18% max—Heat exchangers & condensers

SA210 A1 Tube Applications

  •   Water-tube boilers and water-wall panels
  •   Superheater and reheater coils
  •   Economisers
  •   Boiler flues, safe ends, arch and stay tubes
  •   Heat recovery steam generators (HRSG)
  •   Thermal and captive power plants
  •   Refineries, petrochemical and fertilizer plants
  •   Paper mills and process steam boilers
Industries using SA210 A1 boiler tubes

Looking for another grade? Browse all carbon steel tubes, our heat exchanger tubes or products for the boiler industry. Planning a retubing job? See the boiler retubing enquiry checklist.

SA210 Gr A1 Tubes: FAQs

What is SA210 Gr A1 material?

SA210 Gr A1 is a seamless medium-carbon steel tube specified by ASME SA210 / ASTM A210 for boiler tubes, boiler flues, safe ends, arch and stay tubes, and superheater tubes. Grade A1 has 0.27% carbon maximum, 0.93% manganese maximum and at least 0.10% silicon, with a minimum tensile strength of 415 MPa (60 ksi). Tubes are made from killed steel, from 12.7 to 127 mm (1/2 to 5 in.) OD.

What is the difference between SA210 A1 and SA210 C?

Both are seamless boiler tube grades under the same specification. Grade C has more carbon (0.35% max) and manganese (0.29–1.06%), so it is stronger: 485 MPa (70 ksi) minimum tensile and 275 MPa (40 ksi) minimum yield, against 415 MPa and 255 MPa for Grade A1. Grade C is used where a higher design stress allows a thinner wall; Grade A1 is the more common general-purpose choice.

What is the equivalent of SA210 Gr A1?

There is no exact equivalent, but the closest comparable grades are UNS K02707, EN 10216-2 P265GH, DIN 17175 St 45.8 and JIS G3461 STB 410. Check your design code before substituting one for another, because test and heat-treatment requirements differ between standards.

What is the difference between SA210 and SA179?

SA179 is a seamless cold-drawn low-carbon tube (0.18% C max) for heat exchangers and condensers, limited to 76.2 mm (3 in.) OD and 325 MPa minimum tensile. SA210 A1 is a medium-carbon boiler and superheater tube up to 127 mm (5 in.) OD with 415 MPa minimum tensile. Use SA179 for heat transfer bundles and SA210 for boiler pressure parts.

What is the difference between SA210 A1 and SA192?

Both are seamless carbon steel boiler tubes. SA192 is a low-carbon grade (0.06–0.18% C) with 325 MPa minimum tensile strength, while SA210 A1 is a medium-carbon grade with 415 MPa minimum tensile. The higher strength of SA210 A1 allows a thinner wall for the same pressure.

Is SA210 tube seamless or welded?

SA210 tubes are seamless only. They may be supplied hot-finished or cold-finished; cold-finished tubes are heat treated after the final cold draw by subcritical annealing, full annealing or normalizing. For welded (ERW) boiler tubes, see ASME SA178.

Should I order SA210 tubes hot-finished or cold-finished?

Order the finish shown on the boiler drawing or purchase specification. Cold-finished tubes have closer OD and wall tolerances and a smoother surface and must be heat treated after the final cold draw; hot-finished tubes need no heat treatment but have wider tolerances under ASTM A450. State the finish in your enquiry because it changes the tolerance basis.

What should an SA210 enquiry include?

Give the specification (ASME SA-210 / ASTM A210), grade (A1 or C), finish (hot- or cold-finished), OD, minimum wall, length, quantity, end finish, tests, documents (EN 10204 3.1, plus IBR or third-party inspection if required) and the delivery date.

Export Destinations for SA210 A1 Tubes

We supply SA210 A1 and SA210 C boiler tubes within India and export to boiler makers and power plants in the Middle East, Africa, Asia (including Japan), Europe and the Americas. Tell us your destination port when you send your RFQ.