Carbon Seamless Boiler Tube – Product Showcase
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Grade A-1, Grade C Superheater Tubes in Boiler
Material
Grade A-1 and Grade C superheater tubes are made of seamless medium-carbon steel as per ASTM A210 / ASME SA210 specification. These tubes are specifically engineered for use in superheaters and reheaters in steam boilers, where they must withstand high pressure, elevated temperatures, and continuous thermal cycling.
Specification
| Standard | ASTM A210 / ASME SA210 |
| Grades | A-1 and C |
| Form | Seamless |
| Manufacturing Process | Cold Drawn |
| Surface Finish | Bare, oiled, or varnished |
| Outer Diameter | 25-426mm |
| Wall Thickness | 1-100mm |
| Length | Up to 12 m (custom cut-to-length available) |
Key Features
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High Strength at Elevated Temperature: Grade C offers higher tensile and yield strength than Grade A-1, suitable for higher steam pressure applications.
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Excellent Pressure Resistance: Designed for high-pressure steam superheater systems.
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Good Creep Resistance: Maintains structural integrity under prolonged exposure to heat.
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Reliable Heat Transfer: Smooth inner surface for optimal thermal efficiency.
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Weldability and Machinability: Easily welded and fabricated with proper preheating.
Chemical Composition
| Grade | C (%) Max | Mn (%) | Si (%) Min | P (%) Max | S (%) Max |
|---|---|---|---|---|---|
| A-1 | 0.27 | 0.93 | - | 0.035 | 0.035 |
| C | 0.35 | 0.29–1.06 | 0.10 | 0.035 | 0.035 |
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| A-1 | ≥415 | ≥255 | ≥30 |
| C | ≥485 | ≥275 | ≥30 |
Steel Grade
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ASTM A210 Grade A-1: Standard medium-carbon steel with balanced strength and ductility, used for general superheater tube applications.
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ASTM A210 Grade C: Higher carbon content for improved strength, designed for higher-pressure and higher-temperature service.
Application
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Boiler Superheater Tubes: For converting saturated steam into superheated steam.
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Reheater Tubes: For reheating steam between turbine stages in power plants.
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Economizer Tubes: Used in some designs for heat recovery systems.
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Steam Generator Tubing: In petrochemical, refinery, and industrial boilers.
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Process Heaters: High-temperature heat exchange systems.
Possible Alternative Grades
Possible alternatives include ASTM A192 (for lower-pressure service), DIN 17175 St35.8 / St45.8, EN 10216-2 P235GH / P265GH, GB 5310 (20G, 25MnG), and JIS G3461 STB340/STB410.
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Reason: These grades have similar mechanical properties, pressure ratings, and temperature resistance, allowing engineers to select alternatives based on local availability, design codes, and cost optimization without compromising performance.
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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