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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 and other systems where corrosion resistance is essential. It is available in both seamless and resistance-welded forms, with minimum wall thickness requirements to ensure structural integrity under demanding conditions.
Standard Specification: ASTM A423 provides the standard specification for seamless and electrically welded low-alloy steel pipes. This grade is commonly used in industrial and power generation environments where reliability and durability are critical. The pipe typically has an outer diameter ranging from 1/2 to 5 inches (12.7 to 127 mm) and a wall thickness between 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 or welded process. Seamless pipes may undergo hot or cold working to achieve desired mechanical properties and dimensional accuracy. Welded pipes are manufactured through resistance welding techniques that ensure strong and consistent joints.
Heat Treatment: To enhance the material's mechanical properties and ensure uniformity, ASTM A423 Grade 3 steel pipes must be normalized or subjected to appropriate heat treatment. This process improves toughness, strength, and resistance to deformation under stress.
| 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 of 1.25% per each 1/32 in. [0.6 mm] decrease in wall thickness below 5/16 in. [8 mm] from the basic minimum elongation | 1.25 A |
| Hardness | 170 HB |
Calculated elongation requirements should be rounded to the nearest whole number. These specifications ensure that ASTM A423 Grade 3 steel pipes meet strict quality and performance standards for use in critical industrial applications.
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