Products Description

ASTM A423 Grade 3 Seamless Tube is a low-alloy steel tubing specifically designed for use in high-temperature and moderate-pressure service, such as in heaters, heat exchangers, boilers, and air preheaters.

product-437-437

This grade is known for its excellent resistance to atmospheric corrosion, as well as high mechanical strength and long-term durability, making it ideal for industrial and structural applications.

Corten tube specification

Thickness	Wall Thickness	Grades
1/8, 3/16, 1/4, 1/2 "	2 to 12.5 mm	Gr A and B
Specification	Shape	Mill Length
ASTM A847	circular, square, rectangular	6000/12000 mm

Mechnical property for A423 Grade 3 seamless pipe

Yield strength (Mpa) Min.	Tensile strength (Mpa) Min.	Elongation in 50mm ≥,%
230	380	35

Chemical composition for A423 Grade 3 seamless pipe (Heat Analysis Max%)

Main chemical elements composition of A423 Grade 3
C	Si	Mn	P	S	Cu	Mo	Ni	Sb
0.06	0.55	0.70-1.40	0.02	0.02	0.25-0.45	0.20	0.50	0.05-0.15

Outside Diameter & Tolerance

Outside Diameter, mm	Tolerance, mm
3.2≤OD＜25.4	±0.10
25.4≤OD≤38.1	±0.15
38.1＜OD＜50.8	±0.20
50.8≤OD＜63.5	±0.25
63.5≤OD＜76.2	±0.30
76.2	±0.38

Applications of ASTM A423 Grade 3 Seamless Tube

ASTM A423 Grade 3 seamless tubes are widely used in industries that demand both high-temperature strength and superior corrosion resistance. The alloy's ability to withstand oxidation, scaling, and corrosion under severe atmospheric and process conditions makes it a preferred material for long-term service.

Common applications include:

Air Preheaters and Heat Exchangers:
These tubes are often employed in air preheating systems and heat exchangers, where they operate at temperatures up to 400–500°C. The material's stable oxide layer minimizes corrosion and scaling, ensuring reliable heat transfer and reduced maintenance costs.

Boilers and Superheater Tubes:
A423 Grade 3 tubes are suitable for use in high-pressure boilers and superheaters, where resistance to thermal fatigue and oxidation is critical. The material maintains mechanical integrity even under cyclic heating and cooling conditions.

Petrochemical and Refinery Systems:
In refineries, the tubes are used to transport hot process gases and fluids. Their nickel, chromium, and copper content enhances resistance to sulfur-bearing environments, hydrogen attack, and stress corrosion cracking.

Power Plant Piping Systems:
Ideal for feedwater lines, economizers, and exhaust piping, A423 Grade 3 offers excellent performance in both coal-fired and gas turbine power plants. Its weldability and impact toughness ensure safe and efficient system operation.

Industrial Heaters and Process Gas Lines:
Frequently utilized in chemical plants and gas processing facilities, the tubes provide durable performance in high-temperature pipelines carrying gases such as CO₂, H₂, and hydrocarbons, extending service life and reducing downtime.

Contact now to get ASTM A423 Grade 3 seamless tubes Quote

product-800-1000