ASME SA210: Seamless Medium-Carbon Boiler Tubes (Grade A1, C)

Overview

ASME SA210, also written SA-210 or ASTM A210/A210M in the ASTM publication, specifies minimum-wall seamless medium-carbon steel boiler and superheater tubes in Grades A-1 and C. Grade C has different chemistry and higher listed minimum mechanical properties than Grade A-1. That difference is not a universal pressure, temperature, superheater or substitution rule. Like SA192 and SA213, SA210 is tube ordered by outside diameter and wall basis rather than pipe ordered only by nominal pipe size and schedule. The approved boiler design must select the exact ASTM or ASME designation, edition, grade, product form and condition. It must also set outside diameter, minimum or average wall basis, length, straight or bent form and fabrication route. Engineering must use the governing construction-code material line, allowable stress at design metal temperature, pressure calculation and service life. Corrosion or process environment, expansion and bending requirements, welding procedure, heat treatment, NDE and authority approvals belong in that same check. SA210 is not simply a stronger or better SA192, and Grade C is not an inventory substitute for Grade A-1 or SA213 alloy tube. Chemistry, allowable stress, heat treatment and weldability differ, as do forming, hardness and long-term behaviour. A complete Kanpur RFQ should reproduce the approved material line and state source requirements, heat or lot traceability, marking, packing, tests, inspection hold points and document-release route. For an IBR-controlled tube, the official forms index assigns Form III-B, not generic Form III-C. The competent authority must confirm the accepted manufacturer or source, inspection plan, records and release. An EN 10204 inspection document is separate supporting evidence and does not itself establish statutory acceptance. Pricing and delivery are also fact-specific. Availability, mill slot, grade, OD, wall, length, condition, quantity, tests, bending, inspection scheduling and documents must be stated in the current written quotation, together with legally applicable tax, freight and packing. At receipt, reconcile the purchase order, bundle and tube markings, heat identity, grade, dimensions, wall basis and condition. Check the certificate, heat-treatment records, tests and statutory release against the same lot. Any proposed grade, material, wall, edition, source or document substitution must return to the boiler designer and competent authority before allocation or fabrication.

SA210 is a minimum-wall boiler tube specification

ASME SA210 is the Boiler and Pressure Vessel Code adoption of ASTM A210/A210M, Seamless Medium-Carbon Steel Boiler and Superheater Tubes. The A210/A210M-26 store abstract covers minimum-wall seamless medium-carbon boiler tubes, boiler flues including safe ends, arch and stay tubes and superheater tubes. Grades are A-1 and C, with different chemical and tensile requirements. Tubes are killed steel and seamless, and they are marked hot-finished or cold-finished. The abstract notes this type is not suitable for safe ending by forge welding.

SA210 is a tube standard ordered by OD and wall, not by NPS and schedule. It is not SA192, SA213, ASTM A53 or A106 pipe, or IS 1239 water tube. For an IBR tube route, the official forms index points to Form III-B; the approved design and authority determine the exact material and supporting records.

Who should specify SA210 for Kanpur boiler-tube outages

Specify SA210 when the approved boiler drawing names Grade A1 or Grade C for the component. Grade A1 has a 0.27% maximum carbon value and 415 MPa minimum tensile value on this page; Grade C has 0.35% maximum carbon and 485 MPa minimum tensile. A Kanpur stores team should match the drawing, not pick Grade C because it sounds stronger or apply a universal service-temperature label.

Do not substitute SA210 into utility, structural or plumbing service, or replace it with SA213 from a website temperature ladder. The governing code material line, exact grade and condition, allowable stress, design conditions, service life and environment control selection, together with fabrication, welding and the approved drawing. Do not accept average-wall tube when the design says minimum wall. Obtain current commercial terms for the exact OD, wall, grade, source, tests, inspection and IBR route where applicable.

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 has 0.27% maximum carbon and 415 MPa minimum tensile strength on this page. SA210 C has 0.35% maximum carbon and 485 MPa minimum tensile strength. Those material properties do not create a universal pressure or temperature rating; the code calculation and approved drawing select the grade.

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 is the ASME code adoption of ASTM A210/A210M. Do not publish a single maximum service temperature or automatic crossover to SA213. The governing code material line, exact grade, condition, design temperature and pressure, allowable stress, service life, environment and fabrication route determine suitability. ASTM A53, IS 1239 and IS 3589 are not silent boiler-tube substitutes.

Read the ASTM size range as usual furnish, not a design limit

The ASTM A210/A210M-26 abstract describes 12.7 to 127 mm OD and 0.9 to 12.7 mm minimum wall as sizes usually furnished. Other dimensions may be supplied when they meet the remaining specification requirements.

Order SA210 by outside diameter and wall thickness, not nominal pipe size. The abstract's usual-furnish range is the consistent commercial reference used on this route. A boiler drawing may use another dimension, but the buyer must confirm mill capability, code acceptance, minimum-wall basis and the rest of the specification before treating it as an SA210 offer.

• Usual outside-diameter range: 12.7 to 127 mm.
• Usual minimum-wall range: 0.9 to 12.7 mm.
• Other dimensions: permitted only when the remaining specification requirements are met.
• Wall basis: state minimum wall or average wall exactly as the drawing requires.

Build a current, comparable SA210 commercial quotation

SA210 has no fixed mill-direct price by grade or size band. Quote the exact approved material, source, dimensions, condition and quantity in writing, plus tests, inspection, documents, tax, freight and delivery terms.

Commercial comparison begins only after the technical descriptions match. A rate for a different grade, wall basis, condition, source, test scope, inspection route, or document package is not a comparable SA210 offer, even when both quotations use a per-kilogram unit.

• Technical basis: exact ASTM or ASME designation and edition, Grade A-1 or C, OD, minimum or average wall, condition, length, straight or bent form.
• Quality basis: approved source, traceability, tests, NDE, inspection hold points, Form III-B route where applicable, and complete document-release conditions.
• Commercial basis: quantity, unit and theoretical or actual mass basis, validity, availability, processing, packing, legally applicable tax, freight, delivery point, and committed date.
• Price varies with grade, OD, wall basis, condition, length, quantity and approved source. Tests, inspection, documents and delivery terms also move the rate. Do not assume Grade C carries a fixed premium over A1; compare current like-for-like quotations.
• Ask the written quotation to identify every exception. Do not promise stock, a landed rate, inspection fee, premium, credit term, or delivery interval until the exact scope and source are confirmed.

Write Grade A1 or Grade C into the boiler-tube RFQ

Receiving teams should match the drawing grade to the heat, component marking, Form III-B where applicable, and supporting records. Write Grade A1 or Grade C in full; SA210 alone is not a complete line.

• Grade: A1 or C, copied from the drawing
• OD and wall: millimetres, minimum-wall or average-wall as the drawing states (usual furnish on the A210/A210M-26 abstract is 12.7-127 mm OD and 0.9-12.7 mm min wall)
• Length: state the drawing length, random-length acceptance, or cut-to-length requirement
• Condition: hot-finished or cold-finished; straight or U-bent
• End finish: plain, or prepared for expansion into the tube sheet
• Coating: none unless the fabricator asks for a transit coat; this is not a galvanized product
• Documents: project-defined inspection records; for an IBR tube, verify Form III-B and the complete approved document set
• Tests: tension, flattening, flaring, hardness, hydrostatic or NDE
• Inspection: IBR-recognized IA or the named TPI
• Delivery basis: ex-works Kanpur, quantity in metres or MT, with legally applicable tax and charges stated in the current quotation

Check mass for the 50.8 mm OD × 3.6 mm line

The boiler-tube price list on this site tabulates 50.8 mm OD × 3.6 mm wall for SA210. Using the site formula W = (OD − t) × t × 0.02466 kg/m: W = (50.8 − 3.6) × 3.6 × 0.02466 = 4.19 kg/m. A 6 m straight tube is 25.1 kg before bends or stub ends.

That result is theoretical bare-steel mass. A minimum-wall order must satisfy the ordered minimum after the applicable tolerance. If the drawing uses average wall, state that basis. Remaining wall after corrosion allowance belongs to the boiler design, not a warehouse estimate.

Document mismatches that block boiler-tube acceptance

A boiler-tube lot cannot be reconciled when Grade A1 is offered against a Grade C drawing or when the MTC heat reference does not match the bundle marking. The inspector needs one consistent grade, dimension, heat and certification trail.

• SA192 offered as equivalent because both are boiler tubes
• Average-wall supply against a minimum-wall calculation
• A53 or A106 pipe cut to tube length and presented as SA210
• Form III-B or another required tube record missing on an IBR installation
• Grade C welded with an A1 procedure and no hardness check

Tie ASTM tests to the ASME and IBR document trail

The ASTM A210/A210M-26 abstract requires tension, flattening, flaring, hardness and hydrostatic or nondestructive electric tests. Superheater tubes must stand expansion, beading, forging, welding and bending. The abstract states that mechanical properties do not apply below 3.2 mm inside diameter or 0.4 mm thickness.

For an Indian boiler order, specify SA210 only when the approved drawing uses that designation. The inspection record, bundle marks, release, Form III-B where applicable, and supporting documents should identify the same grade and heat. Alloy service stays on the grade selected by engineering rather than being inferred from SA210 pricing.

SA210 decisions to confirm before mill release

• SA210 is seamless medium-carbon boiler tube in Grade A1 or Grade C, ordered by OD and wall.
• A1 tensile on this page is 415 MPa min; C is 485 MPa min. The grades are not interchangeable.
• A210/A210M-26 usually furnished sizes are 12.7-127 mm OD and 0.9-12.7 mm minimum wall.
• A 50.8 × 3.6 mm tube weighs 4.19 kg/m on the site formula.
• IBR tube jobs require the approved material and component-specific Form III-B route; A53 or SA192 is not a silent substitute for SA210.