Overview
ASTM A423 specification covers low-alloy seamless steel tubes, including A423 Grade 1, Grade 2, and Grade 3. Among them, A423 Grade 1 seamless steel tubes are typically normalized heat-treated before supply to ensure consistent mechanical properties and structural reliability.
These tubes are widely used in pressure vessels, boilers, heat exchangers, and industrial piping systems where high strength, toughness, and corrosion resistance are required.
Technical Requirements & Additional Services
For A423 Grade 1 seamless steel tubes, the following services and quality controls are available:
Hydrostatic test or Nondestructive electric test (NDT) to ensure tube integrity.
Mill Test Certificate in accordance with EN 10204 Type 3.1 or 3.2.
CNC cutting according to customer drawings for precise dimensions.
Surface protection options including black coating, varnish, pickling, shot blasting, and beveled ends for easy connection.
Mechanical Properties (A423 Grade 1 Seamless Pipe)
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 255 |
| Tensile Strength (MPa) | ≥ 415 |
| Elongation in 50 mm (%) | ≥ 25 |
These properties ensure excellent strength, ductility, and fatigue resistance, making A423 Grade 1 seamless tubes suitable for demanding engineering applications.
Chemical Composition (Heat Analysis Max %)
| Element | Max / Min % |
|---|---|
| Carbon (C) | 0.15 |
| Silicon (Si) | ≥ 0.10 |
| Manganese (Mn) | 0.55 |
| Phosphorus (P) | 0.06–0.16 |
| Sulfur (S) | 0.06 |
| Copper (Cu) | 0.20–0.60 |
| Chromium (Cr) | 0.24–1.31 |
| Nickel (Ni) | 0.20–0.70 |
This optimized alloy composition provides corrosion resistance, weldability, and mechanical reliability, meeting the stringent requirements for industrial and structural applications.
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