ASME SA210 — Seamless Medium-Carbon Boiler Tubes (Grade A1, C)
Seamless medium-carbon steel boiler and superheater tubes with Grade A1 and Grade C strength options.
ASME SA210, also written SA-210 or ASTM A210/A210M in the ASTM publication, specifies seamless medium-carbon steel boiler and superheater tubes. It is commonly ordered in Grade A1 and Grade C, with Grade C providing higher carbon, manganese, yield strength, and tensile strength than Grade A1. The standard is used where a boiler designer needs stronger carbon steel tubing than SA192 while still remaining in a carbon/medium-carbon boiler tube family rather than moving to alloy grades such as SA213 T11, T22, or T91. Like SA192, SA210 is a tube specification ordered by outside diameter and wall thickness, not by nominal pipe size and schedule. It is relevant to high-pressure boilers, superheaters, waterwall assemblies, generating banks, economizers, and other pressure parts, subject to design temperature, code allowable stress, and boiler-maker approval. Buyers often ask whether SA210 can replace SA192. The answer depends on the drawing and code calculation: SA210 is not simply a “better SA192,” because its chemistry, strength, forming behavior, hardness, welding procedure, bending response, and allowable stress basis differ. Grade A1 is used where moderate strength is enough, while Grade C is selected when higher mechanical strength is required. For Indian projects, IBR documentation, approved source, third-party inspection, heat traceability, and correct ASME/ASTM wording can be as important as the tube itself. A complete RFQ should specify SA210 Grade A1 or Grade C, OD, wall basis, length, quantity, manufacturing condition, heat treatment, straight or U-bent form, test requirements, packing, marking, and inspection hold points. The phrase “boiler tube” is not sufficient because SA192, SA210, SA213, SA179, and SA334 can all be described as tubes while serving very different temperature and pressure duties. Equivalent-grade cross-reference should therefore be controlled: SA210 maps to ASTM A210/A210M; SA192 is the lower-strength carbon boiler tube comparison; ASTM A106/ASME SA106 is seamless pipe for high-temperature service; ASTM A53 is general-purpose pipe and not a boiler tube substitute. For Grade C especially, confirm welding procedure qualification, preheat/PWHT expectations, bend radius, ovality, hardness, and end-preparation requirements before purchase. The main procurement risks are receiving Grade A1 when Grade C was required, receiving average-wall tube when minimum-wall was specified, missing IBR paperwork, or accepting a mill certificate that does not match the heat numbers marked on bundles. RP Sales evaluates SA210 enquiries as code-pressure items: the offer should align the grade, mill route, inspection plan, and certification package with the boiler manufacturer’s drawing and inspector requirements. If a buyer wants to rationalize inventory, SA210 Grade C may cover some higher-strength needs, but substitutions must be approved by the boiler designer because excess strength alone does not guarantee compatibility with fabrication, expansion, bending, welding, or long-term service.
Grade A1 vs Grade C
Grade A1 has lower carbon (0.27% max) and tensile strength (415 MPa min) than Grade C (0.35% max carbon, 485 MPa min). Choose the grade on your boiler drawing.
SA210 A1 is the medium-carbon grade (0.27% max C) with minimum tensile 415 MPa, used in utility and industrial boilers. SA210 C is the higher-strength variant (0.35% max C, 485 MPa min tensile) for high-pressure boiler circuits rated up to 425°C.
Always match the grade exactly as shown on the boiler drawing. SA210 A1 and SA210 C are NOT interchangeable — they have different carbon, manganese, and strength levels that affect allowable stress, forming, welding, and inspection acceptance.
Chemical composition reference
- Grade A1 carbon: 0.27% max typical limit.
- Grade C carbon: 0.35% max typical limit.
- Grade A1 manganese: up to 0.93% typical maximum.
- Grade C manganese: 0.29–1.06% typical range.
- Phosphorus and sulphur: 0.035% max each typical limit for both grades.
Mechanical properties reference
- Grade A1 tensile strength: 415 MPa minimum typical requirement.
- Grade A1 yield strength: 255 MPa minimum typical requirement.
- Grade C tensile strength: 485 MPa minimum typical requirement.
- Grade C yield strength: 275 MPa minimum typical requirement.
- Elongation, hardness, flattening, flaring, and hydro/NDE tests are controlled by specification and purchase order.
Equivalent grades and substitutions
SA210 carbon steel tubes are rated for service up to 425°C — matching SA192 temperature limit. For higher design temperatures (540°C+), SA213 T11/T22/T91 alloy grades provide the creep resistance required. SA210 is the ASME code version of ASTM A210/A210M; do not use ASTM A53, IS 1239, or IS 3589 as boiler-tube substitutes.
Chemical composition — SA210 Grade A1 vs Grade C
Grade C has higher carbon (0.35% max vs 0.27% max) and manganese (0.80–1.06% vs 0.80–0.93%) compared to Grade A1, giving it higher strength but requiring tighter welding controls.
- Grade A1 carbon: 0.27% max; Grade C carbon: 0.35% max.
- Grade A1 manganese: 0.80–0.93%; Grade C manganese: 0.80–1.06%.
- Silicon: 0.40% max for both grades typical.
- Phosphorus: 0.035% max each; Sulphur: 0.035% max each.
- Grade C requires more attention to preheat and PWHT during welding due to higher carbon equivalent.
Standard dimensions and temperature ratings
SA210 tubes cover OD 19–152mm with wall 2.1–8.0mm. Maximum service temperature is 425°C for both SA210 A1 and SA210 C — same as SA192. SA213 alloys handle higher temperatures to 650°C.
SA210 boiler tubes are ordered by outside diameter and wall thickness, not nominal pipe size. Common production ranges cover three size bands used across waterwall, economizer, and superheater assemblies. Both SA210 A1 and SA210 C share the 425°C maximum service temperature rating under the ASME Code.
- OD 19–50.8mm, wall 2.1–5.0mm — typical for waterwall and economizer tubes in small boilers.
- OD 50.8–101.6mm, wall 2.8–6.5mm — standard size range for most utility and industrial boilers.
- OD 101.6–152.4mm, wall 3.0–8.0mm — larger boiler circuits and economizer banks.
- Standard random lengths: 6.0–9.0m, typically 7.0m random for mill production.
- Minimum wall or average wall basis is specified per drawing; do not assume average wall unless specified.
Indicative pricing — mill-direct ranges for SA210 tubes
Current mill-direct pricing for SA210 Grade A1 boiler tubes typically ranges from ₹145–220/kg depending on OD, wall thickness, and quantity. Contact RP Sales for firm offers.
Pricing varies significantly with size: smaller OD and thinner wall sections command higher per-kg rates due to higher processing cost per tonne.
- OD ≤50.8mm, WT ≤3.2mm: ₹185–220/kg indicative for small-quantity orders.
- OD 50.8–101.6mm, WT 3.2–5.0mm: ₹165–195/kg indicative range.
- OD ≥101.6mm, WT ≥5.0mm: ₹145–175/kg for larger dimensions.
- Prices are indicative and depend on quantity, grade (C costs more than A1), mill source, and delivery terms.
- RP Sales provides current landed pricing on enquiry with confirmed specifications.
| Grade | Type | Max temp | Max pressure | Common application |
|---|---|---|---|---|
| SA192 | Low-carbon | 425°C | Medium | Low-pressure water-tube boilers, economizer circuits |
| SA210 A1 | Medium-carbon | 425°C | Medium-high | Utility and industrial boilers, waterwalls, economizers |
| SA210 C | Medium-carbon (higher tensile) | 425°C | High | High-pressure boiler tubes, superheater inlet |
| SA213 T11 | 1¼Cr-½Mo | 540°C | High | Superheater tubes, mid-temperature alloy service |
| SA213 T22 | 2¼Cr-1Mo | 595°C | High | Superheater tubes, high-temperature alloy service |
| SA213 T91 | 9Cr-1Mo-V | 650°C | Very high | Ultra-supercritical boiler service |
| Product form | Seamless medium-carbon steel boiler and superheater tube |
|---|---|
| Standard | ASME SA210 / ASTM A210/A210M |
| Grades | Grade A1 and Grade C |
| Typical size basis | Ordered by outside diameter and wall thickness/minimum wall as specified |
| Chemical composition | A1 C 0.27% max, Mn up to 0.93%; C grade C 0.35% max, Mn 0.29–1.06%; P/S 0.035% max typical |
| Mechanical properties | A1 yield 255 MPa min/tensile 415 MPa min; Grade C yield 275 MPa min/tensile 485 MPa min typical |
| Manufacture | Seamless, hot-finished or cold-finished as specified |
| Applications | Boiler, superheater, economizer, waterwall, and pressure-part tube service |
| Testing | Tension, flattening, flaring, hardness, hydrostatic or NDE as applicable |
| Documentation | MTC 3.1, ASME/IBR certification route, heat traceability, TPI reports on request |
- ASME SA-210/SA-210M — Seamless Medium-Carbon Steel Boiler and Superheater Tubes — The American Society of Mechanical Engineers (ASME)
- ASTM A210/A210M — Standard Specification for Seamless Medium-Carbon Steel Boiler and Superheater Tubes — ASTM International
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