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Introduction to ASTM A423 Grade 3 Low Alloy Steel Pipe
ASTM A423 Grade 3 is a low alloy steel pipe designed for use in pressure-bearing applications, such as economizers or other systems where corrosion resistance is essential. It includes both seamless and electric resistance welded pipes with minimum wall thickness requirements.
Standard Specification: ASTM A423 covers seamless and electrically welded low alloy steel pipes. These pipes are commonly used in industrial applications that require strength and durability under pressure. The standard specifies dimensions ranging from an outside diameter of 1/2 to 5 inches (12.7 to 127 mm) and wall thicknesses from 0.035 to 0.500 inches (0.9 to 12.7 mm).
Manufacturing Process: ASTM A423 Grade 3 pipes can be produced using either a seamless process, which may involve hot or cold working methods, or through electric resistance welding. This ensures the material maintains its structural integrity while meeting the required mechanical properties.
Heat Treatment: To achieve the desired mechanical properties, ASTM A423 Grade 3 steel pipes must be normalized or undergo a suitable heat treatment process. This helps improve the material's strength, toughness, and overall performance in demanding environments.
| Carbon, max | 0.06 |
| Manganese | 0.70–1.40 |
| Phosphorus | 0.020 max |
| Sulfur, max | 0.020 |
| Silicon | 0.55 max |
| Copper | 0.25–0.45 |
| Chromium | — |
| Nickel | 0.50 max |
| Molybdenum | 0.20 max |
| Antimony | 0.05–0.15 |
| Â | Grade 3 |
| Tensile Strength, min. ksi | 55 [380] |
| Yield Strength, min, ksi [MPa] | 33 [230] |
| Elongation in 2 in. or 50 mm. min, % | 35 |
| For longitudinal strip tests, a deduction for each 1/32 in. [0.6 mm] decrease in wall thickness below 5/16 in. [8 mm] from the basic minimum elongation of the following percentage points shall be made | 1.25 A |
| Hardness | 170 HB |
ASTM A423 Grade 3 is ideal for applications requiring a balance between strength, ductility, and corrosion resistance. Its chemical composition and mechanical properties make it well-suited for use in power generation, petrochemical, and industrial piping systems. Always ensure compliance with the latest ASTM standards when selecting materials for critical applications.
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