ASTM A283 grade C VS A36 steel

ASTM A283 grade C and A36 steel are two of the most popular carbon steel grades used in a variety of applications. However, their properties and applications differ significantly. In this article, we will compare their mechanical and chemical properties, as well as their applications.

Mechanical Properties

ASTM A283 GrC steel is a low- to intermediate-strength carbon steel that is used in structural and mechanical applications. Its tensile strength ranges from 55,000 to 62,000 psi. Yield strength varies between 30,000 and 40,000 psi. Meanwhile, ASTM A36 steel has a tensile strength of 58,000 to 80,000 psi and a yield strength of 36,000 psi.

In terms of hardness, both grades have a Brinell hardness of 119-159. However, ASTM A283 grade C has a slightly higher yield strength than ASTM A36 steel.

Chemical Properties

Both ASTM A283 grade C and A36 steel are carbon steel alloys. They have a carbon content of up to 0.29%, which is low enough to minimize overheating and cracking during welding. However, their chemical compositions differ slightly.

ASTM A283 grade C contains 0.24% carbon, 0.90% manganes, 0.035% phosphorus, and 0.04% sulfur. On the other hand, ASTM A36 steel contains 0.26% carbon, 0.80% manganese, 0.060% phosphorus, and 0.050% sulfur.

Applications

ASTM A283 grade C is commonly used in structural applications that require low to intermediate tensile strength, such as buildings and bridges. It is also used in offshore platforms, shipbuilding, and pressure vessels. Meanwhile, ASTM A36 steel is commonly used in the construction of buildings, bridges, and industrial machinery.

Both grades are suitable for welding, although ASTM A36 steel is considered more weldable due to its lower carbon content. However, ASTM A283 grade C can be welded, provided that the carbon content of the filler metal is less than 0.35%. It is important to note that both grades are susceptible to cold cracking when welded and require preheating before welding.

Cost

ASTM A283 grade C carbon steel and A36 steel have different costs due to their composition, properties, and applications. ASTM A283 grade C is more affordable than ASTM A36 steel, making it more commonly used in low to intermediate strength applications. However, ASTM A36 steel is preferred for high-strength applications because of its higher yield and tensile strength.

ASTM A283 grade C and ASTM A36 carbon steel have similar mechanical and chemical properties, but their applications and costs differ significantly. ASTM A283 grade C carbon steel is commonly used in low to intermediate strength applications, such as buildings and bridges, while ASTM A36 carbon steel is preferred for high-strength applications, such as industrial machinery and heavy construction. Whatever the application of these two grades, they both have their pros and cons, and it is important to select the right grade to ensure the stability and durability of any finished product.