Alloy Steel Tubes

Alloy Steel Tubes

Seamless chrome-moly boiler, superheater and heat exchanger tubes in ASTM A213 T5, T9, T11, T12, T22 and T91 for high-temperature, high-pressure service.

ASTM A213 / ASME SA213 1/2" – 4" OD IBR Approved

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Alloy Steel Tubes

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Chrome-Moly Tubes

ASTM A213 Alloy Steel Seamless Tubes

Tubewell Steel & Engg. Co. is a manufacturer, stockist and supplier of ferritic alloy steel tubes to ASTM A213 / ASME SA213 in grades T5, T9, T11, T12, T22 and T91. Our seamless chrome-moly tubes are used in boilers, superheaters, reheaters and heat exchangers across power, refinery and petrochemical plants in India and abroad.

StandardASTM A213 / ASME SA213

GradesT5, T9, T11, T12, T22, T91

Outside Diameter1/2" – 4" (12.7 – 101.6 mm)

Wall Thickness1.65 – 12.7 mm

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Product Overview

Ferritic chrome-moly tubes for heat transfer under pressure

Alloy steel tubes are seamless ferritic tubes alloyed with chromium and molybdenum to retain strength, resist creep and withstand oxidation at elevated temperatures. ASTM A213 / ASME SA213 is the principal specification for seamless ferritic and austenitic alloy steel boiler, superheater and heat exchanger tubes. Its ferritic T-grades range from the 1Cr-½Mo T12 and 1¼Cr-½Mo T11, through the 2¼Cr-1Mo T22, to the 5Cr and 9Cr grades T5 and T9 and the creep-strength-enhanced 9Cr-1Mo-V T91.

Tubes are made hot finished or cold drawn and heat treated to the requirements of A213, with general requirements per ASTM A1016 / A1016M. We also supply heat exchanger and condenser tubes to the older ASTM A199 specification and refinery still tubes to ASTM A200, both of which have now largely been replaced by A213 in new designs. All tubes ship with EN 10204 3.1 mill test certificates. IBR certification and third-party inspection by BV, TÜV, SGS or Lloyd's are available on request.

Full range from T12 up to T91
Seamless hot finished & cold drawn
IBR approved boiler tube supply
Straight, U-bent & finned tubes
Tight OD & wall tolerances per A1016
100% hydro or eddy current tested

5Cr-½Mo

ASTM A213 T5 Tubes

5Cr-0.5Mo tubes for refinery heaters and sulphur-bearing service.

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9Cr-1Mo

ASTM A213 T9 Tubes

9Cr-1Mo tubes for furnace coils and high-temperature oxidation.

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1¼Cr-½Mo

ASTM A213 T11 Tubes

1.25Cr-0.5Mo-Si tubes for superheaters and steam service.

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1Cr-½Mo

ASTM A213 T12 Tubes

1Cr-0.5Mo tubes for economisers, waterwalls and low-temperature superheaters.

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2¼Cr-1Mo

ASTM A213 T22 Tubes

2.25Cr-1Mo tubes with higher creep strength for reheaters.

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9Cr-1Mo-V

ASTM A213 T91 Tubes

Creep strength enhanced tubes for supercritical boilers.

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IBR

Alloy Steel Boiler Tubes

Superheater, reheater and waterwall tubes with IBR certification.

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U-Bent

Heat Exchanger Tubes

Straight, U-bent and finned tubes for exchangers and condensers.

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Specifications

Standard supply range for alloy steel tubes

Parameter	Details
Standard	ASTM A213 / ASME SA213; ASTM A199 & A200 (legacy specifications)
General Requirements	ASTM A1016 / A1016M
Grades	T5, T9, T11, T12, T22, T91 (also T5b, T21, T23 on request)
Type	Seamless – Hot Finished / Cold Drawn
Outside Diameter	12.7 mm to 101.6 mm (1/2" – 4"); larger ODs on request
Wall Thickness	1.65 mm to 12.7 mm (16 BWG – 1/2"), average or minimum wall
Length	Single Random, Double Random, Cut Length (up to 18 m)
Form	Straight, U-Bent, Serpentine / Coiled, Finned
Ends	Plain End, Bevelled End
Heat Treatment	Full / Isothermal Annealed or Normalized & Tempered (grade-wise temper per A213)
Surface	Black Painted, Varnished, Anti-rust Oil, Pickled
Testing	Hydrostatic or Eddy Current, Ultrasonic, Flattening, Flaring, Hardness, Tensile, PMI
Certificates	EN 10204 3.1 / 3.2, IBR Form III-A, TPI Reports

Material Grades & Equivalents

International equivalents of ASTM A213 ferritic grades

Grade	ASTM	UNS	EN	DIN / W.Nr.	JIS	BS
T5	A213 T5	K41545	X11CrMo5	1.7362	STBA 25	3604 HFS 625
T9	A213 T9	K90941	X11CrMo9-1	1.7386	STBA 26	3059 629-470
T11	A213 T11	K11597	13CrMo4-5	1.7335	STBA 23	3604 HFS 621
T12	A213 T12	K11562	13CrMo4-5	1.7335	STBA 22	3059 620-460
T22	A213 T22	K21590	10CrMo9-10	1.7380	STBA 24	3059 622-490
T91	A213 T91	K90901	X10CrMoVNb9-1	1.4903	STBA 28	–

Chemical Composition

Weight %, as per ASTM A213

CCarbon0.05–0.15

MnManganese0.30–0.61

PPhosphorus≤ 0.025

SSulphur≤ 0.025

SiSilicon≤ 1.00

CrChromium0.80–10.00

MoMolybdenum0.44–1.13

VVanadium (T91)0.18–0.25

Grade	C	Mn	P	S	Si	Cr	Mo	Others
T5	0.15 max	0.30 – 0.60	0.025 max	0.025 max	0.50 max	4.00 – 6.00	0.45 – 0.65	–
T9	0.15 max	0.30 – 0.60	0.025 max	0.025 max	0.25 – 1.00	8.00 – 10.00	0.90 – 1.10	–
T11	0.05 – 0.15	0.30 – 0.60	0.025 max	0.025 max	0.50 – 1.00	1.00 – 1.50	0.44 – 0.65	–
T12	0.05 – 0.15	0.30 – 0.61	0.025 max	0.025 max	0.50 max	0.80 – 1.25	0.44 – 0.65	–
T22	0.05 – 0.15	0.30 – 0.60	0.025 max	0.025 max	0.50 max	1.90 – 2.60	0.87 – 1.13	–
T91	0.07 – 0.14	0.30 – 0.60	0.020 max	0.010 max	0.20 – 0.50	8.00 – 9.50	0.85 – 1.05	V 0.18–0.25, Nb 0.06–0.10, N 0.030–0.070, Ni 0.40 max, Al 0.02 max

Mechanical Properties

Minimum values at room temperature, as per ASTM A213

Grade	Tensile Strength	Yield Strength (0.2%)	Elongation in 2"	Hardness (max)
T5	415 MPa (60 ksi) min	205 MPa (30 ksi) min	30% min	163 HBW / 85 HRB
T9	415 MPa (60 ksi) min	205 MPa (30 ksi) min	30% min	163 HBW / 85 HRB
T11	415 MPa (60 ksi) min	205 MPa (30 ksi) min	30% min	163 HBW / 85 HRB
T12	415 MPa (60 ksi) min	205 MPa (30 ksi) min	30% min	163 HBW / 85 HRB
T22	415 MPa (60 ksi) min	205 MPa (30 ksi) min	30% min	163 HBW / 85 HRB
T91	585 MPa (85 ksi) min	415 MPa (60 ksi) min	20% min	250 HBW / 25 HRC

415–585MPa

Min. Tensile Strength

205–415MPa

Min. Yield Strength

20–30%

Min. Elongation

Physical Properties

Typical values (for reference)

Property	T11 / T12	T22	T5	T9	T91
Density (g/cm³)	7.85	7.83	7.75	7.70	7.77
Modulus of Elasticity (GPa)	205	206	205	205	218
Thermal Conductivity at 100°C (W/m·K)	37	36	30	26	26
Mean Thermal Expansion 20–300°C (µm/m·°C)	12.4	12.5	11.8	11.2	11.2
Specific Heat (J/g·°C)	0.46	0.46	0.46	0.46	0.46
Approx. Max. Service Temperature	565 – 595 °C	≈ 600 °C	≈ 650 °C	≈ 650 °C	≈ 650 °C

Dimension & Weight Chart

Tube OD vs wall thickness (BWG / mm) – weight in kg/m

Showing popular sizes. Other sizes available on request.

OD (inch)	OD (mm)	16 BWG (1.65)	14 BWG (2.11)	12 BWG (2.77)	10 BWG (3.40)	8 BWG (4.19)
1/2"	12.70	0.45	0.55	0.68	0.78	–
5/8"	15.88	0.58	0.72	0.90	1.05	–
3/4"	19.05	0.71	0.88	1.11	1.31	1.54
1"	25.40	0.97	1.21	1.55	1.84	2.19
1 1/4"	31.75	1.22	1.54	1.98	2.38	2.85
1 1/2"	38.10	1.48	1.87	2.41	2.91	3.50
1 3/4"	44.45	1.74	2.20	2.85	3.44	4.16
2"	50.80	2.00	2.53	3.28	3.97	4.82
2 1/2"	63.50	2.52	3.19	4.15	5.04	6.13
3"	76.20	3.03	3.86	5.02	6.10	7.44
3 1/2"	88.90	3.55	4.52	5.88	7.17	8.75
4"	101.60	4.07	5.18	6.75	8.23	10.06

Column headings show BWG gauge with wall thickness in mm; values are weight in kg/m, calculated as (OD − WT) × WT × 0.02466. Values are nominal; actual weights may vary within ASTM A1016 tolerances.

Applications

Where alloy steel tubes are used

Thermal Power Plants

Superheater, reheater, waterwall and economiser coils in utility boilers.

Refineries

Fired heater coils, still tubes and hydrotreater exchanger bundles.

Petrochemicals

Reformer, cracker and process heater tubing in hydrogen service.

HRSG & Waste Heat Boilers

Heat recovery steam generator modules behind gas turbines.

Heat Exchangers

Shell-and-tube exchangers, feedwater heaters and condensers.

Fertilizer Plants

Ammonia converters and waste heat exchangers needing hydrogen-attack resistance.

Testing & Why Choose Us

Quality you can verify on every heat

Ready Stock

Large inventory for fast dispatch

Certified Material

MTC EN 10204 3.1 / 3.2

100% PMI

Positive material identification

On-time Delivery

Pan-India & export shipping

Hydrostatic Test Eddy Current Test Ultrasonic Test Flattening Test Flaring Test Hardness Test Tensile Test Macro / Micro Test

Frequently Asked Questions

Quick answers about alloy steel tubes

A213 covers seamless tubes ordered by actual outside diameter and wall thickness for boilers, superheaters and heat exchangers. A335 covers seamless pipes ordered by nominal pipe size and schedule for process piping. The chemistry of T-grades and P-grades with the same number (e.g. T22 / P22) is essentially the same.

T11 and T12 suit moderate temperatures. T22 is used where higher creep strength is needed. T5 and T9 are preferred for refinery heaters where sulphidation and oxidation are concerns. T91 is chosen for supercritical and ultra-supercritical boilers, where thinner walls at high pressure reduce weight and thermal stress.

Yes. For replacement work on older equipment we can supply tubes certified to A199 (heat exchanger and condenser tubes) and A200 (refinery still tubes). Both specifications are now largely superseded by A213, so dual certification is usually offered.

We supply IBR approved A213 boiler tubes with Form III-A, together with EN 10204 3.1 mill test certificates. Inspection by an IBR-approved inspecting authority or another TPI agency can be arranged.

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