ASTM A210 Standard Specification for Seamless Medium-Carbon Steel Boiler and Superheater Tubes
ASTM A210 is a standard specification that covers seamless medium-carbon steel (CS) boiler tubes and superheater tubes. It is a widely used material for boiler tubes, superheaters, and heat exchangers in power generation and industrial plants. Unlike A192, A210 covers a broader range of carbon steel grades.
Key Features:
Material: Medium-Carbon Steel (Grade A-1) and Carbon-Manganese Steel (Grade C).
Manufacturing Process: Seamless (SMLS).
Primary Use: Boiler tubes, superheaters, and similar pressure parts in moderate to high-temperature service.
Key Property: Good strength and formability; Grade C offers higher strength.
Two Main Grades:
| Grade | Description | Common Application |
|---|---|---|
| A-1 | Medium-carbon steel. The standard grade for general boiler service. | General boiler tubes, economizers. |
| C | Carbon-manganese steel. Provides higher tensile and yield strength than A-1. | Superheater tubes, high-temperature sections, where higher strength is needed. |
Basic Chemical Composition Requirements (ladle analysis):
| Element | Grade A-1 (%) | Grade C (%) |
|---|---|---|
| Carbon (C) | 0.13 - 0.19 | 0.24 - 0.31 |
| Manganese (Mn) | 0.37 - 0.65 | 0.84 - 1.15 |
| Phosphorus (P), max | 0.035 | 0.035 |
| Sulfur (S), max | 0.035 | 0.035 |
| Silicon (Si), min | 0.10 | 0.10 |
Basic Mechanical Properties:
| Property | Grade A-1 | Grade C |
|---|---|---|
| Tensile Strength, min | 415 MPa (60,000 psi) | 485 MPa (70,000 psi) |
| Yield Strength, min | 255 MPa (37,000 psi) | 275 MPa (40,000 psi) |
| Elongation (in 50mm), min | 30% | 30% |
Comparison with ASTM A192:
A192 is for minimum-wall-thickness, low-carbon steel tubes primarily for high-pressure water-tube boilers.
A210 is for standard-wall, medium-carbon/higher-strength tubes used in boilers and superheaters where greater strength is required, especially at elevated temperatures. Grade C is a common alternative to A192 when higher strength is needed.
