Chemical Composition:
The chemical composition of A612/A612M-12 steel grade mainly consists of carbon (C), manganese (Mn), phosphorus (P), sulfur (S), silicon (Si), and copper (Cu). The maximum allowable content for each element is as follows:
– Carbon (C): 0.25%
– Manganese (Mn): 1.00–1.50%
– Phosphorus (P): 0.035%
– Sulfur (S): 0.035%
– Silicon (Si): 0.15–0.50%
– Copper (Cu): 0.35%
This steel grade has a relatively low carbon content, which makes it suitable for applications that require good weldability and moderate strength.
Mechanical Properties:
The mechanical properties of A612/A612M-12 steel grade are specified as per the ASTM A612/A612M standard. These include:
– Tensile strength: The minimum tensile strength of this steel grade is 550-690 MPa (megapascals). This indicates the maximum stress that the material can withstand before it starts to deform or break under tension.
– Yield strength: The minimum yield strength of A612/A612M-12 steel grade is 345 MPa. This represents the stress at which the material begins to permanently deform, in the absence of any external force.
– Elongation: The minimum elongation of this steel grade is 18%. Elongation is a measure of the material’s ability to deform plastically before fracture. It represents the percentage increase in length of a test specimen after it has been pulled to failure.
– Impact toughness: The minimum average Charpy V-notch impact energy of A612/A612M-12 steel grade is 27 J (joules) at -50°C (-58°F). Impact toughness measures the ability of a material to absorb energy during an impact without fracturing or breaking.
Standard number:
A612/A612M-12 is the standard number for the specification of steel grade A612/A612M. This standard is issued by the ASTM International, an organization that sets standards for materials, products, systems, and services. The standard provides requirements for the chemical composition, mechanical properties, and performance of this specific steel grade.
Corresponding standard:
The corresponding standard for A612/A612M-12 steel grade is ASTM A612/A612M. This standard specifies the requirements for normalized high-strength low-alloy structural steel plates for pressure vessels. It covers three grades of steel, including A612/A612M-12. The standard defines the chemical composition, mechanical properties, testing methods, and other relevant specifications for these steel grades.