ASTM A213 T11 Low Alloy Steel Seamless Boiler Tube for Boiler
Product Overview
ASTM A213 T11 seamless boiler tube is a ferritic low alloy steel tube designed for boiler, superheater, and heat exchanger applications.
T11, UNS K11597, is a chromium-molybdenum alloy steel containing approximately 1.00–1.50% chromium and 0.44–0.65% molybdenum. The alloy composition is designed for elevated-temperature service in industrial heating and power-generation equipment.
ASTM A213 T11 tubes are manufactured by the seamless process and can be supplied in hot-finished or cold-finished conditions according to project requirements. The standard covers tubes used in boilers, superheaters, and heat exchangers.
Typical applications include boiler tube systems, superheater components, heat exchangers, steam generation equipment, and other industrial systems operating at elevated temperatures.
Technical Specifications
| Item |
Specification |
| Product Name |
ASTM A213 T11 Seamless Boiler Tube |
| Material Grade |
T11 |
| UNS Designation |
K11597 |
| Material Type |
Ferritic Low Alloy Steel |
| Standard |
ASTM A213 / A213M |
| ASME Equivalent |
SA213 T11 |
| Manufacturing Process |
Seamless |
| Manufacturing Condition |
Hot Finished / Cold Finished |
| Outside Diameter |
Customized according to project requirements |
| Wall Thickness |
Customized according to project requirements |
| Length |
Random Length / Fixed Length |
| Heat Treatment |
Annealing or Normalizing and Tempering according to applicable requirements |
| Surface |
Pickled / Bright / Customized |
| Testing |
Tensile, Hardness, Flattening, Flaring, Hydrostatic or Nondestructive Electric Test |
| Documentation |
Material Test Certificate (MTC) |
ASTM A213 requires seamless manufacture and specifies mechanical and product testing requirements for the applicable grades.
Chemical Composition
ASTM A213 T11 Chemical Composition
| Element |
Composition, % |
| Carbon (C) |
0.05–0.15 |
| Manganese (Mn) |
0.30–0.60 |
| Silicon (Si) |
0.50–1.00 |
| Phosphorus (P) |
≤0.025 |
| Sulfur (S) |
≤0.025 |
| Chromium (Cr) |
1.00–1.50 |
| Molybdenum (Mo) |
0.44–0.65 |
| Nickel (Ni) |
No specified requirement |
The ASTM composition limits identify T11 as UNS K11597 and specify chromium and molybdenum as the principal alloying elements.
Mechanical Properties
ASTM A213 T11 Mechanical Properties
| Property |
Minimum / Maximum Requirement |
| Tensile Strength |
≥415 MPa |
| Yield Strength |
≥205 MPa |
| Elongation |
≥30% |
| Hardness |
≤163 HBW / 170 HV / 85 HRB |
These values are commonly listed for ASTM A213 T11 and should be verified against the applicable edition of the standard and the supplied material test certificate for each production heat.
Material Characteristics
Chromium-Molybdenum Alloy Steel
T11 is a low alloy chromium-molybdenum steel. Its controlled Cr-Mo composition makes it suitable for elevated-temperature boiler and heat-transfer equipment.
The specified composition includes:
-
Chromium: 1.00–1.50%
-
Molybdenum: 0.44–0.65%
-
Silicon: 0.50–1.00%
These alloying elements are part of the material specification rather than marketing claims.
Seamless Tube Construction
ASTM A213 T11 tubes are produced by the seamless process. Depending on the required dimensions and manufacturing route, tubes can be supplied in hot-finished or cold-finished conditions.
Suitable for Boiler and Heat-Transfer Systems
The ASTM A213 specification specifically covers seamless tubes for:
-
Boilers
-
Superheaters
-
Heat exchangers
This makes T11 particularly relevant to industrial equipment manufacturers and engineering contractors specifying Cr-Mo alloy steel tubing.
Manufacturing Process
ASTM A213 T11 Seamless Tube Manufacturing
A typical manufacturing route includes:
-
Steel billet preparation
-
Hot piercing and tube forming
-
Hot finishing or cold finishing
-
Heat treatment
-
Surface cleaning
-
Dimensional inspection
-
Mechanical testing
-
Hydrostatic or nondestructive electric testing
-
Material certification
The actual production route should be specified according to tube dimensions, finish requirements, applicable ASTM requirements, and the purchaser's technical specification.
Applications
Boiler Tubes
ASTM A213 T11 tubes can be used in boiler systems where ferritic low alloy steel tubing is specified for elevated-temperature service.
Superheater Tubes
T11 tubing can be used in superheater assemblies for steam-generation equipment.
Heat Exchangers
Applications include industrial heat-transfer equipment where the specified material and dimensional requirements are suitable.
Power Generation Equipment
Typical applications include:
Industrial Heating Equipment
T11 tubes may also be specified for industrial thermal-processing and heating equipment where Cr-Mo alloy steel tubing is required.
Product Advantages
ASTM A213 Specification
The product is designed around ASTM A213 requirements for seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes.
Chromium-Molybdenum Alloy
The T11 chemistry contains specified chromium and molybdenum ranges, providing a clearly defined alloy composition for engineering material selection.
Seamless Manufacturing
The seamless construction is suitable for applications where the tube specification calls for seamless boiler, superheater, or heat-exchanger tubing.
Multiple Inspection Options
Depending on the order specification, inspection can include:
ASTM A213 identifies these testing requirements within its product specification.
Material Traceability
Material documentation can include:
-
Material Test Certificate (MTC)
-
Chemical composition
-
Mechanical test results
-
Heat treatment records
-
Dimensional inspection records
-
NDT or hydrostatic test records
ASTM A213 T11 vs Other Boiler Tube Grades
A comparison section is recommended because engineers and buyers often evaluate several boiler tube grades before selecting a material.
| Grade |
Main Alloying Elements |
Typical Positioning |
| T11 |
Cr + Mo |
Low alloy boiler and heat-transfer applications |
| T12 |
Cr + Mo |
Alternative low alloy boiler applications |
| T22 |
Higher Cr + Mo |
Higher alloy content for demanding service |
| T91 |
Cr + Mo + V and other alloying elements |
Higher-strength elevated-temperature applications |
The exact grade should be selected according to design temperature, pressure, corrosion environment, required mechanical properties, applicable code, and engineering specification rather than simply by nominal alloy content.
ASTM A213 T11 vs ASME SA213 T11
ASTM A213 and ASME SA213 are closely related specifications used in boiler and pressure-equipment applications.
For ASME Boiler and Pressure Vessel Code applications, ASTM identifies SA-213 as the related specification in Section II.
For a commercial product page, it is useful to include both terms naturally:
-
ASTM A213 T11
-
ASME SA213 T11
-
A213 T11 Tube
-
SA213 T11 Tube
-
T11 Boiler Tube
-
T11 Seamless Tube
However, do not claim that every ASTM A213 tube automatically satisfies every ASME project requirement. The purchase order, applicable code edition, inspection requirements, and certification should be checked for each project.
FAQ
What is ASTM A213 T11 tube?
ASTM A213 T11 is a seamless ferritic low alloy steel tube specified for boiler, superheater, and heat-exchanger applications. The UNS designation is K11597.
What is the chemical composition of T11 steel?
T11 contains 1.00–1.50% chromium and 0.44–0.65% molybdenum, together with controlled levels of carbon, manganese, silicon, phosphorus, and sulfur.
Is ASTM A213 T11 seamless?
Yes. ASTM A213 specifies seamless tubes for the covered boiler, superheater, and heat-exchanger grades.
What is the difference between ASTM A213 T11 and ASME SA213 T11?
ASTM A213 is the ASTM material specification, while SA213 is the related ASME specification referenced for ASME Boiler and Pressure Vessel Code applications. Project-specific code and certification requirements should be confirmed before supply.
Where is T11 boiler tube used?
Typical applications include boilers, superheaters, heat exchangers, steam-generation systems, and other industrial heat-transfer equipment.
What certificates can be supplied with T11 tubes?
Depending on the order requirements, documentation may include an MTC, chemical composition, mechanical test results, heat treatment records, dimensional inspection, and hydrostatic or NDT records.
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