ASTM A213 T21 Alloy Steel Tube For Superheater and Reheater Sections in Boilers
ASTM A213 T21 Alloy Steel Tube For Superheater and Reheater Sections in Boilers
Specification
ASTM A213 T21 is a seamless alloy steel tube designed for high-temperature applications in boilers, superheaters, and heat exchangers. It is a ferritic alloy steel containing chromium and molybdenum, known for its durability, creep strength, and oxidation resistance. The tubes are manufactured to a specified chemical composition, mechanical properties, and must undergo a heat treatment, such as full annealing, isothermal annealing, or normalizing and tempering.
| American Standard | Standard Name |
| A213 / A213M | Seamless Ferritic and Austenitic Alloy-steel Boiler,Superheater and Heat-Exchanger Tubes |
ASTM A213 T21 Alloy Steel Pipe Chemical Composition
Sources American Standard A213 / A213M TABLE 1 Chemical Composition Limits, % , for Low Alloy Steel
| Grade | UNS Designation |
C | Mn | P | S | Si | Cr | Mo |
| T21 | K31545 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50-1.00 | 2.65-3.35 | 0.80-1.06 |
ASTM A213 T21 Alloy Steel Pipe Mechanical Properties
Sources American Standard A213 / A213M TABLE 4 Tensile and Hardness Requirements
| Grade Low Aloy Steels: |
UNS Designation |
TensileStrength. min, ksi [MPa] |
Yield Strength ,min, ksi [MPa] |
Elongationin 2 in. or 50 mm. min, %B.C |
HardnessA | |
| Brinell/Vickers | Rockwell | |||||
| T21 | K31545 | 60 [415] | 30 [205] | 30 | 163 HB/170 HV | 85 HRB |
ASTM A213 T21 Alloy Steel Pipe Heat Treatment
Sources American Standard A213 / A213M TABLE 3 Heat Treatment and Grain Size Requirements A
| Grade Ferritic Alloy Steels |
UNS Designation |
Heat Treatment Type | Subcritical Annealingor TemperingTemperature,min or range °F [°C] |
| T21 | K31545 | full or isothermal anneal | - |
| normalize and temper | 1250[675] |
ASTM A213 T21 Alloy Steel Pipe Manufacturing Proces
ASTM A213 T21 Alloy Steel Pipe Application
- High-Temperature Boiler Sections
- Petrochemical Heater Tubes
- Service in Hydrogen Environments
- Components Exposed to Sulfur Corrosion
- General High-Temperature Pressure Tubing
ASTM A213 T21 Alloy Steel Pipe Packing & Loading
a. 1/2"-2"Plain end with black oil paint, caps both ends, bundles with loading belt.
b. 2"-4"Beveled end with black oil paint, caps both ends, bundles with loading belt.
c. 10"-20"Beveled end with black oil paint, caps both ends, loose packed in to container.
→Alloy Steel Pipes is transported in containers
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