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ASTM A213/ASME SA213 is a standard specification for seamless ferritic and austenitic alloy steel tubes used in high-temperature applications, including boilers, superheaters, and heat exchangers.
Super Steel Manufacturing Co.,Ltd is professional ASTM A213 T122 seamless alloy pipes manufacturer, for more details, please contact:sales@super-steels.com
Characteristics and Uses of ASTM A213 T22 Alloy Steel Tubes
ASTM A213 T22 alloy steel tubes are widely utilized in high-temperature environments such as power plant boilers, petrochemical systems, nuclear power facilities, and heat exchangers. This grade is classified as 2.25Cr-1Mo low alloy steel, offering excellent thermal strength, oxidation resistance, hydrogen corrosion resistance, and good weldability.
Due to the inherent material properties, as the operating temperature of ASTM A213 T22 tubes increases, their hoop strength decreases. To compensate for this, manufacturers must increase tube thickness to withstand internal pressure. However, beyond a certain limit, further thickness increases become impractical, necessitating modifications in the tube's chemical composition to enhance its high-temperature performance.
Material Selection and Transition Considerations
To accommodate rising temperatures in superheater applications, manufacturers progressively transition from carbon steel to low alloy steel, high alloy steel, and finally stainless steel. The point at which this material transition occurs is carefully determined by manufacturers based on the margin between the allowable temperature of SA213 T22 material and the actual operating temperature along the tube length.
Selecting the correct transition point is critical for preventing failures in superheaters. Factors that can impact this decision include:
- Reduced steam flow in certain superheater sections due to excessive de-superheating water injection
- Unit overloading
- Radiation heat variations in the area
- Excessive heat transfer surface area
Challenges in Heat Transfer Surface Modifications
Enhancing the material transition point in heat transfer components such as reheaters and superheaters often requires significant in-situ welding, leading to extended maintenance shutdowns. Therefore, precise selection of transition materials is essential to ensure operational stability and reliability in high-temperature environments.
ASTM A213 T22 Tubing Equivalent Material
|
UNS |
ASTM |
EN |
DIN |
JIS |
GB |
|
K11562 |
P22 |
13CrMo44 |
1.7335 |
STBA24 |
12Cr2Mo |
Chemical Composition Of ASTM A213 T22 Pipe
|
Grade |
C |
Mn |
P |
S |
Si |
Cr |
Mo |
|
Gr T22 |
0.05-0.15 |
0.30-0.60 |
≤0.025 |
≤0.025 |
0.50 |
1.90-2.60 |
0.87-1.13 |
Mechanical Properties Of ASTM A213 T22 Pipe
|
Material |
Tensile Strength (Mpa) |
Yield Strength (Mpa) |
Elongation(%) |
Hardness(HRB) |
|
Gr T22 |
≥415 |
≥220 |
≥30 |
≤85 |
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