ASME SA213 T11 Seamless Alloy Tube 1.25Cr-0.5Mo Chrome Moly for Boiler Superheater Power Plant

ASME SA213 T11 Seamless Alloy Steel Tube for Boiler and Superheater

Product Overview

ASME SA213 T11 seamless alloy steel tube is a chromium-molybdenum alloy steel tube manufactured to ASME SA213 / ASTM A213 requirements for boiler, superheater and heat-exchanger service.

T11, UNS K11597, contains approximately 1.00–1.50% chromium and 0.44–0.65% molybdenum. The material is supplied as seamless tubing and is commonly specified for heat-transfer equipment where the material grade, tube dimensions, heat treatment and inspection requirements are controlled by the applicable specification and project documents.

The product can be supplied in customized outside diameters, wall thicknesses and lengths according to project requirements.

Technical Specifications

ASTM A213 generally covers tubing from 1/8 in. [3.2 mm] inside diameter to 5 in. [127 mm] outside diameter, with wall thicknesses from 0.015 to 0.500 in. [0.4 to 12.7 mm], although other dimensions may be supplied when the applicable requirements are met.

Chemical Composition

ASTM A213 / ASME SA213 T11

Mechanical Properties

The standard minimum mechanical requirements for T11 include:

Manufacturing Process

The ASME SA213 T11 tube is manufactured through a controlled seamless tube production process:

1. Alloy steel billet preparation

2. Piercing and hot working

3. Tube rolling or drawing

4. Heat treatment according to the applicable specification

5. Straightening

6. Cutting to specified lengths

7. Surface treatment

8. Dimensional inspection

9. Mechanical and product testing

10. Final inspection and marking

11. Packing for shipment

The manufacturing route can be adjusted according to the required outside diameter, wall thickness, delivery condition and project specification.

Tube Dimensions

Available dimensions can include:

• 3/4" OD × specified wall thickness

• 1" OD × specified wall thickness

• 1-1/4" OD × specified wall thickness

• 1-1/2" OD × specified wall thickness

• 2" OD × specified wall thickness

• 2-1/2" OD × specified wall thickness

• 3" OD × specified wall thickness

Other outside diameters and wall thicknesses can be supplied subject to production capability and applicable specification requirements.

For heat-exchanger and boiler projects, the following dimensional information can be confirmed before production:

• Outside diameter

• Wall thickness

• Tube length

• OD and WT tolerances

• Straightness

• End condition

• Heat-treatment condition

• Surface condition

Quality Control and Inspection

Each production lot can be inspected according to the applicable ASTM/ASME requirements and purchase order.

Inspection may include:

• Chemical composition analysis

• Tensile testing

• Yield strength testing

• Elongation testing

• Hardness testing

• Flattening test

• Flaring test

• Hydrostatic testing

• Eddy current or other applicable nondestructive testing

• Outside diameter inspection

• Wall thickness inspection

• Length inspection

• Visual and surface inspection

Additional third-party inspection, PMI, dimensional inspection or other project-specific requirements can be arranged when specified in the purchase order.

Applications

Boiler Tubes

ASME SA213 T11 seamless tubes are used for boiler heat-transfer components where the specified alloy-steel grade is required.

Superheater Tubes

The tubes can be specified for superheater and related boiler heating-surface applications according to the design temperature, pressure and applicable engineering code.

Heat Exchangers

T11 seamless alloy tubes can also be used in heat-exchanger equipment where ASTM A213 / ASME SA213 material requirements apply.

Power Generation Equipment

Typical equipment applications include:

• Utility and industrial boilers

• Superheater systems

• Reheater-related equipment

• Heat-exchanger tube bundles

• Power-generation heat-transfer equipment

• Process heating equipment

The final material selection should be based on the equipment design temperature, pressure, fluid, tube dimensions, applicable code and project specification.

Why Specify T11?

T11 is a ferritic low-alloy steel grade defined by its chromium and molybdenum content. Its standardized chemical composition and mechanical requirements make it suitable for engineered boiler, superheater and heat-exchanger tubing applications covered by ASTM A213 / ASME SA213.

Rather than using generic claims such as “excellent high-temperature performance,” the material should be specified according to the actual design conditions and the requirements of the applicable code.

Customization

The SA213 T11 seamless alloy tube can be supplied according to project-specific requirements for:

• Outside diameter

• Wall thickness

• Tube length

• Heat-treatment condition

• Surface finish

• End preparation

• Testing requirements

• Inspection requirements

• Packing method

• Marking requirements

For bulk orders, tube dimensions and inspection requirements can be confirmed against the customer's tube schedule, equipment drawing or purchase specification before production.

Documentation

Typical documentation can include:

• Material Test Certificate (MTC)

• Chemical analysis report

• Mechanical test report

• Heat-treatment records where applicable

• Nondestructive testing report where specified

• Hydrostatic test report where applicable

• Dimensional inspection report

• Certificate of conformity

• Third-party inspection report when required