ASTM A213 ASME SA213 T11 T12 T22  T5 T9 T91 Seamless tube specification

ASTM A213 ASME SA213 T11 T12 T22  T5 T9 T91 Seamless tube specification

T11 · T12 · T22 · T5 · T9 · T91 Boiler & Superheater Tubes

ASTM A213 / ASME SA213 is the standard specification for seamless ferritic and austenitic alloy steel tubes used in boilers, superheaters, reheaters, and heat exchangers operating at high temperature and high pressure.

Grades T11, T12, T22, T5, T9, and T91 are widely applied in power plants, refineries, petrochemical furnaces, and pressure systems, where long-term creep strength, oxidation resistance, and thermal stability are critical.

ASTM A213 / ASME SA213 Standard Overview

Download ASTM A213 standard PDF

  • ASTM A213: American standard for seamless alloy steel boiler and heat exchanger tubes

  • ASME SA213: ASME Boiler & Pressure Vessel Code adopted version of ASTM A213

  • Product form: Seamless tubes only

  • Manufacturing: Hot finished or cold drawn

  • Common tolerance standard: ASTM A999

Available Grades under ASTM A213 / ASME SA213

Ferritic Alloy Steel Grades

  • T11 – 1.25Cr-0.5Mo alloy steel

  • T12 – Enhanced Mn version of T11

  • T22 – 2.25Cr-1Mo alloy steel

  • T5 – 5Cr-0.5Mo alloy steel

  • T9 – 9Cr-1Mo alloy steel

  • T91 – 9Cr-1Mo-V-Nb advanced creep resistant steel

ASTM A213 Chemical Composition Ferritic Alloy Steel

TABLE 1  Chemical Composition Limits, %, for Low Alloy Steel
Grade UNS Designation Carbon Manganese Phosphorus Sulfur Silicon Nickel Chromium Molybdenum Vanadium Boron Niobium Nitrogen Aluminum Tungsten Other Elements
T5 K41545 0.15 0.30–0.60 0.025 0.025 0.50 … 4.00–6.00 0.45–0.65 … … … … … … …
T9 K90941 0.15 0.30–0.60 0.025 0.025 0.25–1.00 … 8.00–10.00 0.90–1.10 … … … … … … …
T11 K11597 0.05–0.15 0.30–0.60 0.025 0.025 0.50–1.00 … 1.00–1.50 0.44–0.65 … … … … … … …
T12 K11562 0.05–0.15 0.30–0.61 0.025 0.025B 0.50 … 0.80–1.25 0.44–0.65 … … … … … … …
T22 K21590 0.05–0.15 0.30–0.60 0.025 0.025 0.50 … 1.90–2.60 0.87–1.13 … … … … … … …
T91 Type 1 K90901 0.07–0.14 0.30–0.60 0.020 0.010 0.20–0.50 0.40 8.0–9.5 0.85–1.05 0.18–0.25 … 0.06–0.10 0.030–0.070 0.02 … Ti 0.01; Zr 0.01
T91 Type 2 Heat K90901 0.08–0.12 0.30–0.50D 0.020D 0.005D 0.20–0.40D 0.20D 8.0–9.5D 0.85–1.05 0.18–0.25 0.001D 0.06–0.10 0.035–0.070D 0.020D 0.05D Ti 0.01D; Zr 0.01D

ASTM A213 Ferritic Alloy Steel Heat treatment

Grade UNS Number Heat Treat Type Austenitizing / Solutioning / Stabilizing Temperature (°F [°C]) Cooling Media Subcritical Annealing or Tempering Temperature (°F [°C])
T5 K41545 full or isothermal anneal; or normalize and temper … … 1250 [675]
T9 K90941 full or isothermal anneal; or normalize and temper … … 1250 [675]
T11 K11597 full or isothermal anneal; or normalize and temper … … 1200 [650]
T12 K11562 full or isothermal anneal; or normalize and temper; or subcritical anneal … … 1200 to 1350 [650 to 730]
T22 K21590 full or isothermal anneal; or normalize and temper … … 1250 [675]
T23 K40712 normalize and temper 1900–1975 [1040–1080] … 1350–1470 [730–800]
T91 Types 1 and 2 K90901 normalize and temper 1900–1975 [1040–1080] … 1350–1470 [730–800]
T92 K92460 normalize and temper 1900–1975 [1040–1080] … 1350–1470 [730–800]

ASTM A213 Ferritic Alloy Steel Pipe Mechanical Properties

Mechanical Properties
Grade Tensile strength(MPa) Yield strength(MPa) Elongation(%) Impact energy(J) Hardness
P11 ≥ 415 ≥ 205 ≥ 22 ≥ 35 ≤ 163HB
P12 ≥ 415 ≥ 220 ≥ 22 ≥ 35 ≤ 163HB
P22 ≥ 415 ≥ 205 ≥ 22 ≥ 35 ≤ 163HB
P5 ≥ 415 ≥ 205 ≥ 22 ≥ 35 ≤ 187HB
P91 585~760 ≥ 415 ≥ 20 ≥ 35 ≤ 250HB
P92 ≥ 620 ≥ 440 ≥ 20 ≥ 35 250HB

Testing & Inspection

ASTM A213 / ASME SA213 tubes are supplied with the following tests:

  • Chemical composition analysis

  • Tensile test

  • Flattening / flaring test

  • Hydrostatic test or Eddy current test

  • Dimensional inspection (ASTM A999)

  • Visual and surface inspection

Size Range

  • Outside Diameter: 1/8″ – 5″ (6.35 mm – 127 mm)

  • Wall Thickness: 0.5 mm – 25 mm

  • Length: Random, Double Random, or Cut-to-Length

Typical Applications

  • Power plant boilers

  • Superheater & reheater tubes

  • Petrochemical furnaces

  • Refinery heat exchangers

  • High-temperature pressure systems

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