The A738/A738M-12a steel grade is a high-strength, low-alloy steel that offers excellent versatility and strength properties. It is commonly used in the construction industry and other applications where high levels of strength and durability are required.
The chemical composition of the A738/A738M-12a steel grade is as follows:
– Carbon (C): 0.20-0.23%
– Manganese (Mn): 1.15-1.50%
– Phosphorus (P): 0.035% max
– Sulfur (S): 0.035% max
– Silicon (Si): 0.15-0.50%
– Nickel (Ni): 0.45-0.65%
– Molybdenum (Mo): 0.20-0.30%
These elements contribute to the steel’s strength and toughness. The carbon content provides the necessary strength, while the manganese content helps improve the steel’s hardenability and wear resistance. The presence of nickel and molybdenum enhances the steel’s ability to resist corrosion and maintain its strength at high temperatures.
In terms of mechanical properties, the A738/A738M-12a steel grade has a minimum yield strength of 550 MPa (80 ksi) and a minimum tensile strength of 620 MPa (90 ksi). It has a high toughness, allowing it to withstand heavy loads and impact forces without deformation or failure. The steel grade also exhibits good weldability, making it suitable for various fabrication processes.
The A738/A738M-12a steel grade complies with the ASTM A738/A738M standard, which specifies the requirements for normalized high-strength low-alloy steel plates for pressure vessels. This standard ensures that the steel meets specific quality and performance criteria for its intended application.
Overall, the A738/A738M-12a steel grade is a reliable and versatile option for structural and pressure vessel applications. Its excellent strength, toughness, and chemical composition make it suitable for various demanding environments and conditions.