ASME SA213: T11 / T22 Alloy Boiler & Superheater Tubes

Overview

ASME SA213 (ASTM A213) specifies seamless ferritic and austenitic alloy-steel boiler, superheater and heat-exchanger tubes. It includes chromium-molybdenum and stainless grades, each with its own chemistry, mechanical properties, heat treatment and tests. T11 and T22 are distinct grades. Neither should be selected from a universal temperature cutoff or substituted just because it is available. Use the governing code material line, exact edition and grade, product form, design metal temperature and pressure, allowable stress, service life, corrosion or process environment, fabrication, welding, and approved drawing. Require the certificate to state the supplied condition and reconcile it with heat-treatment and test records. For an IBR-controlled tube, the official forms index points to Form III-B rather than Form III-C. Verify source and authority scope before order release.

What SA213 is, and what it is not

SA213 is a seamless alloy-steel boiler, superheater and heat-exchanger tube specification. It is a tube standard: order it by OD and wall, not by NPS and schedule.

The ASTM A213/A213M-25 store listing retrieved on 2026-09-03 titles it Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes. Tubes are seamless, hot finished or cold finished as specified.

Usual sizes on that abstract are 1/8 in (3.2 mm) inside diameter to 5 in (127 mm) outside diameter, with 0.015 to 0.500 in (0.4 to 12.7 mm) minimum wall, or average wall if the order says so. Each tube takes a nondestructive electric test or a hydrostatic test.

SA213 is not SA106 pipe: SA106 is carbon steel process pipe. It is also not SA192 or SA210 carbon boiler tube.

H-suffix grades (TP304H, TP347H) carry extra requirements for higher creep-rupture strength. Do not drop the H when the drawing shows it.

Who should buy SA213 for Kanpur-region superheater work

Buy only the grade named by the approved drawing and code calculation. T11, T22, T91 and austenitic H grades have different chemistry, allowable-stress data, heat treatment, fabrication and welding controls. A Kanpur stores team should not upgrade a carbon generating bank or swap alloy grades from a trade temperature chart.

Sugar-mill bagasse boilers, utility water walls and generating banks must stay on the material named by the approved design. Do not switch between SA192, SA210 and SA213 from a website temperature cutoff: allowable stress, service life, corrosion, fabrication, welding and the governing code all matter.

Do not buy SA213 for IS 1239 water pipe, fire hydrants or structural tube. Alloy boiler tube is the wrong product family there.

Do not assume an alloy tube is available on a fixed indent schedule or from a named mill. Confirm the exact grade, size, condition, source approval, inspection route, Form III-B documentation, mill slot and delivery date in the current quotation.

T11 vs T22: selecting the right chrome-moly grade

T11 (UNS K11597) contains 1.0-1.5% chromium and 0.44-0.65% molybdenum on this page. T22 (UNS K21590) increases those ranges to 1.90-2.60% chromium and 0.87-1.13% molybdenum. The chemistry difference affects material-property and fabrication behaviour, but it is not by itself a design selection rule.

Select the exact grade from the governing code material table and approved design. Check allowable stress at the design metal temperature, the pressure calculation, service life, oxidation or corrosion environment, welding procedure, heat treatment, bending and inspection requirements.

Do not present T91/P91 or austenitic H grades as automatic next steps above one number. Their metallurgy, product form, heat treatment, welding and life-assessment controls all require grade-specific engineering approval.

Chemical composition (as per SA213)

• T11: Carbon 0.05-0.15%, Mn 0.30-0.60%, Si 0.50-1.00%, Cr 1.00-1.50%, Mo 0.44-0.65%
• T22: Carbon 0.05-0.15%, Mn 0.30-0.60%, Si 0.50-0.30% max, Cr 1.90-2.60%, Mo 0.87-1.13%
• T5: Carbon 0.15% max, Cr 4.00-6.00%, Mo 0.45-0.65% (higher chrome for refinery service)
• T9: Carbon 0.15% max, Cr 8.00-10.00%, Mo 0.90-1.10% (precursor chemistry to T91/P91)
• TP304H: Carbon 0.04-0.10%, Cr 18.00-20.00%, Ni 8.00-11.00% (austenitic grade; verify the governing code material line and design conditions)

Mechanical properties (as per SA213)

• T11: Yield strength 205 MPa min, Tensile 415 MPa min, Elongation 30% min
• T22: Yield strength 205 MPa min, Tensile 415 MPa min, Elongation 30% min
• T5: Yield strength 205 MPa min, Tensile 415 MPa min, Elongation 30% min
• T9: Yield strength 205 MPa min, Tensile 585 MPa min, Elongation 30% min
• TP304H: Yield strength 205 MPa min, Tensile 515 MPa min, Elongation 35% min
• Hardness: Ferritic grades max 170-220 HB; austenitic grades max 192 HB

Heat treatment requirements

The ordered SA213 edition sets grade-, condition-, dimension- and manufacturing-route-specific heat treatment. Require the certificate and furnace records to identify the actual supplied condition, instead of applying one generic normalising or tempering range to every ferritic grade.

Austenitic grades carry their own grade-specific solution-treatment requirements. Verify the exact edition, grade, product condition, cooling route and any project supplement, and do not copy one temperature band across TP304H, TP316H and TP347H.

Require the applicable inspection document and heat-treatment record under the project specification. For an IBR tube, the official forms index points to Form III-B; do not request Form III-C merely because the tube enters a boiler or superheater.

How to specify SA213 on an RFQ

Alloy tube quotes stall when the buyer writes "T22 boiler tube" and leaves out OD, wall basis, heat treatment and IBR. Put the drawing note on the RFQ line.

• Standard: ASME SA213 / ASTM A213, grade T11, T22, T5, T9, T91, TP304H, TP316H or TP347H
• Size: OD × wall in mm. State minimum wall or average wall. Do not use pipe schedule as a substitute
• Process: seamless, hot-finished or cold-finished as the mill route allows
• Heat treatment: normalized and tempered (ferritic) or solution annealed (austenitic)
• Length: SRL 4-7 m, DRL 7-14 m, or cut-to-length; U-bend if the drawing shows it
• End finish: plain end or beveled for welding
• Surface: pickled, annealed, or polished on austenitic grades
• Documents: project-defined inspection certificate, heat-treatment and test records; for an IBR tube, verify Form III-B and the approved authority route
• Inspection: the authority, witness points and recognition scope named by the approved inspection plan
• Quantity in metres or MT, delivery location, ex-works Kanpur or delivered

T11 and T22 availability varies by grade, size, condition, mill slot, inspection scope and authority scheduling. Do not plan an outage from a generic lead-time range; get a current written date and document-release plan.

Worked mass example: 50.8 mm OD × 3.6 mm wall

Mass still follows W = (OD - t) × t × 0.02466 kg/m. The boiler-tube price list uses 50.8 mm OD × 3.6 mm wall as a listed size row for carbon boiler tubes, and the same geometry is a fair take-off check for an SA213 enquiry of that OD and wall.

(50.8 - 3.6) × 3.6 × 0.02466 = 47.2 × 3.6 × 0.02466 = 4.19 kg/m.

Eighty lengths of 7 m = 560 m. Mass = 560 × 4.19 = 2,346 kg, which is 2.35 MT.

Do not apply the SA192 rupee band on that price-list row to T11 or T22. Alloy tube is indent material. Send OD, wall, grade and the IBR document route for a firm proforma.

Common mistakes on SA213 procurement

Stores sometimes order T11 for a T22 superheater because the names look similar. Chromium and molybdenum ranges are different, and the drawing grade wins.

Carbon SA210 is substituted into a circuit because it is in stock. Material selection must follow the approved design and code calculation. No universal temperature threshold on this page authorises a switch to or from SA213.

Heat-treatment records are missing or do not match the exact grade, condition, material edition and approved plan. For an IBR tube, reconcile those records with Form III-B and the component marking.

U-bent tubes get ordered as straight lengths. Ovality, wall thinning at the bend and post-bend heat treatment must be on the PO if the bank is bent.

Form III-C is requested for tube stock out of habit, but the official index assigns tubes to Form III-B. Ask the competent authority to assess existing stock from its actual source approvals, traceability, condition and records.

Standards and compliance for Indian jobs

The ASME document is SA213. The ASTM publication is A213/A213M. The store listing retrieved on 2026-09-03 is A213/A213M-25 for the current title and size scope.

Each tube is hydrotested or given a nondestructive electric test on that ASTM abstract. Tension, hardness, flattening and flaring are also listed there.

Do not treat SA213 grades as blanket-approved for every boiler design or condition. Confirm the exact grade, edition, product form, heat treatment, source and current authority route. EN 10204 documents are distinct from the prescribed Form III-B for tubes.

Compare SA210 and SA213 using the governing code material line, design metal temperature and pressure, allowable stress, service life, corrosion, fabrication, welding and approved drawing, not stock price or a universal cutoff.

Key points

• SA213 is seamless alloy boiler, superheater and heat-exchanger tube, not carbon pipe.
• Usual ASTM abstract size: 3.2 mm ID to 127 mm OD, 0.4-12.7 mm minimum wall (retrieved 2026-09-03).
• T11 and T22 have different chromium-molybdenum chemistry; choose from the governing code and approved design, not a universal temperature label.
• Heat treatment is grade- and condition-specific; verify the ordered edition and actual furnace records.
• For an IBR tube, confirm Form III-B on the RFQ and get the actual mill and inspection schedule in writing.