ASTM A285 Grade C Carbon Steel Plate is a widely used pressure vessel-quality carbon steel plate specified by the ASTM International standard. It is designed for moderate-temperature service in pressure-containing applications, offering a balance of strength, formability, and weldability. Below is a detailed overview of its key characteristics, applications, mechanical properties, and related specifications:

1. Overview & Scope

ASTM A285 covers low-carbon steel plates intended for fusion-welded pressure vessels and boilers. Grade C is one of three grades in the standard (A, B, C), with Grade C having the highest minimum tensile strength among the three. It is primarily used in moderate-temperature environments (typically up to 650°F / 343°C) where pressure containment is required but high strength is not the primary concern.

 

 

 

 

 

 

 

Mechanical Properties

The mechanical properties of ASTM A285 Gr C are defined to ensure suitability for pressure vessel service:

 

Property	Minimum Requirement
Tensile Strength	40–55 ksi (276–379 MPa)
Yield Strength (0.2% offset)	24 ksi (165 MPa) minimum
Elongation (in 2 inches / 50mm)	25% minimum (for plates ≥ 0.75 inches thick)

 

These properties make it ductile and easy to form (e.g., bending, rolling) and weld using common methods (SMAW, GMAW, GTAW).

 

 

 

 

 

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