A283 Definition and Core Characteristics of Gr.C Material
Definition:
A283 Gr.C (i.e. SA283GrC) is a carbon structural steel plate conforming to ASTM A283/A283M, which belongs to the medium-low strength grade and is designed for the manufacture of low and medium pressure vessels, building structures and general machinery. Core Properties.
Core Properties:
Compositional balance:
Chemical composition (ASTM standard):
Carbon (C) ≤ 0.24%, Manganese (Mn) 0.90% to 1.40%, Silicon (Si) ≤ 0.40%, Sulfur (S) ≤ 0.035%, Phosphorus (P) ≤ 0.035%.
Low carbon content to ensure weldability, manganese elements to enhance strength and toughness.
Mechanical properties:
Tensile strength: 380～515 MPa
Yield strength: ≥205 MPa
Elongation (50mm scale): ≥22%～23%.
Process Advantages:
Weldability: conventional arc welding without preheating, reducing processing costs.
Processability: suitable for stamping, bending, cutting and other processes, low tool wear.
Corrosion resistance: Surface protection can be enhanced by galvanising or painting to prolong service life.
Areas of application
A283 Gr.C material is widely used in the following scenarios:
Pressure vessels: medium and low pressure reactors, heat exchangers, liquefied gas tanks, etc.
Buildings and bridges: beams, columns, bridge deck plates and other structural components to ensure the stability of the load.
Ship and machinery manufacturing: hulls, decks, machine tool parts and bearing housings, etc.
Energy equipment: boiler parts, turbine shells and power station structural parts.
Standards and Delivery Requirements
Execution standard: ASTM A283/A283M, covering material chemical composition, mechanical properties and test methods.
Delivery condition: Usually delivered in hot rolled or normalised condition to meet different processing requirements.
Selection and use considerations
Applicable Pressure Range: Recommended to be used in low and medium pressure systems (e.g. ≤1.6MPa) to avoid overpressure conditions.
Welding and anticorrosion: Clean the welding slag after welding, and the surface is recommended to be painted or galvanised to enhance corrosion resistance.
Processing limitations: Avoid using in extreme low temperature or high shock load scenarios to prevent material embrittlement.
