ASTM A213 T5 (UNS K41545) Alloy Steel Seamless Tube For Boiler and Superheater
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ASTM A213 T5 (UNS K41545) Alloy Steel Seamless Tube For Boiler and Superheater
ASTM A213 T5 Alloy Steel Seamless Tube (UNS K41545) is a high-performance tubular product specifically engineered for high-temperature and high-pressure applications, widely used in boilers, superheaters, and heat exchanger systems. Manufactured from chromium-molybdenum alloy steel (5Cr-0.5Mo), it exhibits exceptional creep resistance, oxidation resistance, and elevated-temperature strength, ensuring structural stability under prolonged thermal stress. The seamless construction enhances pressure-bearing capacity and reliability, complying with ASTM A213 international standards, making it ideal for demanding industrial environments such as power generation and petrochemical sectors.
1.Chemical & Mechanical Properties
| ASTM A213 T5 Chemical Composition (%) | ||||||
| C | Mn | P | S | Si | Cr | Mo |
|
≤0.15% |
0.3%~0.6% | ≤0.025% |
≤0.025% |
≤0.5% |
4.0%~5.0% |
0.45%~0.65% |
Mechanical Properties
| Tensile Strength | Yield Strength (0.2% offset) | Elongation | Hardness |
| ≥415 MPa (60 ksi) | ≥205 MPa (30 ksi) | ≥30% | ≤179 HBW / 92 HRB |
2. Key Adventages
- High-Temperature & High-Pressure Performance
Suitable for high-temperature service up to 600°C (1112°F) with excellent creep resistance and long-term strength.
-
Superior Corrosion Resistance
4-6% Chromium (Cr) content provides strong resistance to steam oxidation and high-temperature corrosion.
-
Outstanding Mechanical Properties
Tensile strength ≥415 MPa, yield strength ≥205 MPa, and elongation ≥30% ensure high reliability and durability.
-
Seamless Manufacturing Process
Seamless construction ensures superior pressure-bearing capacity and safety in demanding applications.
-
Excellent Fabrication & Weldability
Low carbon content (≤0.15%) ensures good weldability and machinability, with recommended pre/post-weld heat treatment.
3. Key Applications
- Power Generation Industry
Boiler tubes: For evaporators, superheaters, and reheaters in high-pressure power plant boilers
Steam pipelines: Critical pipelines for high-temperature/pressure steam transmission
-
Petrochemical Industry
Refining units: Heating tubes for catalytic crackers and hydroprocessing units
Cracking furnace tubes: High-temperature reaction pipes in ethylene crackers
-
Chemical Processing Equipment
Heat exchangers: Core components for shell-and-tube heat exchangers
Reactor piping: High-pressure reaction pipes in fertilizer/ammonia production
-
Industrial Boilers
Industrial superheaters: Heat-resistant tubes for steam systems in paper/textile industries
| Parameter | T5 (K41545) | T9 (K81590) | T11 (K11597) | T22 (K21590) |
|---|---|---|---|---|
| Maximum Service Temp. | ≤600°C | ≤650°C | ≤650°C | ≤650°C |
| Heat Treatment | Normalized+Tempered | Normalized+Tempered | Normalized+Tempered | Normalized+Tempered |
| Weldability | Good, requires preheat | Fair, strict preheat needed | Excellent, low preheat required | Good, moderate preheat needed |
| Corrosion Resistance | Moderate | Excellent | Fair | Good |
| Creep Resistance | Moderate | Excellent | Good | Excellent |
| Oxidation Resistance | Moderate | Outstanding | Fair | Good |
| Machinability | Good | Fair | Excellent | Good |
| Typical Applications | Low-pressure boiler superheaters, heat exchangers | High-pressure boiler tubes, superheaters | Petrochemical heat exchangers, process piping | Power plant main steam lines, high-temperature headers |
| Cost | Economical | Higher | Moderate | Higher |
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