Products Overview
According to U.S. standard A423/A423M, A423 Grade 3 seamless steel tubes are designed with low phosphorus and sulfur content and include antimony (Sb) at 0.05–0.15% to enhance mechanical performance and corrosion resistance.
Gnee Steel stocks a range of wall thicknesses and diameters of A423 Grade 3 seamless tubes, ready for industrial and structural applications.
Technical Requirements & Additional Services
For A423 Grade 3 seamless steel tubes, the following technical requirements and services are available:
Hydrostatic testing or nondestructive electric testing (NDT).
Mill Test Certificates (MTC) compliant with EN 10204 Type 3.1 or 3.2.
CNC cutting to meet custom dimensions and drawings.
Surface protection options: black coating, varnish, pickling, shot blasting, and beveled ends for easy assembly.
Mechanical Properties
| Property | Minimum Value |
|---|---|
| Yield Strength (MPa) | 230 |
| Tensile Strength (MPa) | 380 |
| Elongation in 50 mm (%) | 35 |
These properties provide excellent ductility, toughness, and structural reliability, suitable for industrial piping, pressure vessels, and structural components.
Chemical Composition (Heat Analysis Max %)
| Element | Max / Range % |
|---|---|
| Carbon (C) | 0.06 |
| Silicon (Si) | 0.55 |
| Manganese (Mn) | 0.70–1.40 |
| Phosphorus (P) | 0.02 |
| Sulfur (S) | 0.02 |
| Copper (Cu) | 0.25–0.45 |
| Molybdenum (Mo) | 0.20 |
| Nickel (Ni) | 0.50 |
| Antimony (Sb) | 0.05–0.15 |
This optimized low-alloy composition ensures excellent corrosion resistance, weldability, and long-term durability.
Products Applications
ASTM A423 Grade 3 seamless steel tubes are suitable for:
Boilers, heat exchangers, and industrial piping systems
Pressure vessels and economizers
Chemical and petrochemical facilities
Power plants, structural frameworks, and engineering projects
The combination of high strength, ductility, and corrosion resistance makes these tubes a reliable and versatile choice for demanding industrial and structural applications.
What is the chemical composition of ASTM A423 Grade 1?
The chemical compositions present in the A423 Gr 1 grade are carbon, phosphorus, manganese, sulfur, copper, and silicon. The high content of carbon, manganese, and sulfur provides improved oxidation resistance, pitting resistance to an acidic environment, crevice resistance, and stress corrosion cracking resistance.
What is SA 423 material?
ASTM A423 Weathering Steel Pipes Gr. 1 is popularly used in outdoor sculptures. ASTM A423 Corten Steel Tubes GRADE 1 is also used in bridge and other large structural applications. The chemical elements present in this Corten steel tube are carbon, phosphorus, manganese, sulfur, copper, silicon.
What are the common sizes and dimensions of ASTM A423 pipes?
ASTM A423 pipes are available in a variety of outer diameters, wall thicknesses, and lengths, depending on whether they are seamless or welded. The standard covers nominal pipe sizes ranging from 1/8 inch to 24 inches, with wall thickness and length varying according to application requirements.
What are the mechanical properties of ASTM A423 pipes?
These pipes are designed for high-temperature applications and therefore have high tensile strength, yield strength, and creep resistance. Typical properties include a tensile strength of 415–550 MPa, yield strength of 205–275 MPa, and elongation suitable for forming and welding. Exact values depend on the pipe grade and wall thickness.
Where are ASTM A423 pipes commonly used?
ASTM A423 pipes are widely used in boilers, heat exchangers, superheaters, and power plant equipment. They are ideal for piping systems carrying high-temperature steam, hot liquids, or gases, where corrosion resistance and dimensional stability under heat are required.
