JIS G3103 SB450M is a kind of steel plate used for boilers and pressure vessels, which is specified in the Japanese Industrial Standard (JIS). This grade of steel plate is designed for applications where high strength and excellent toughness are required, particularly in environments where high temperatures and pressures are common.
Chemical Composition:
The chemical composition of SB450M is strictly controlled to ensure the necessary mechanical properties and weldability. The typical chemical composition is as follows:
· Carbon (C): 0.12-0.20%
· Silicon (Si): 0.15-0.35%
· Manganese (Mn): 0.90-1.50%
· Phosphorus (P): ≤ 0.030%
· Sulfur (S): ≤ 0.030%
· Chromium (Cr): ≤ 0.30%
· Nickel (Ni): ≤ 0.30%
· Molybdenum (Mo): ≤ 0.08%
· Copper (Cu): ≤ 0.30%
· Niobium (Nb): ≤ 0.02%
· Vanadium (V): ≤ 0.02%
· Boron (B): ≤ 0.004%
Mechanical Properties:
The mechanical properties of SB450M are as follows:
· Tensile Strength: 450-590 MPa
· Yield Strength: ≥ 295 MPa
· Elongation: ≥ 22%
· Impact Energy (Charpy V-notch test at 0°C): ≥ 47 J
Heat Treatment:
SB450M steel plates are supplied in the normalized condition. Normalization is a heat treatment process that involves heating the steel to a temperature above its upper critical point and then cooling it in air. This process refines the grain structure and improves the mechanical properties of the steel.
Low-Temperature Impact Test:
SB450M steel plates are subjected to low-temperature impact testing to ensure their toughness at sub-zero temperatures. The standard Charpy V-notch impact test is conducted at 0°C, with a minimum impact energy of 47 J.
Main Applications:
Due to its excellent mechanical properties and resistance to high temperatures and pressures, SB450M is widely used in the fabrication of boilers, pressure vessels, and other similar equipment in industries such as power generation, petrochemical, and shipbuilding.
