28Cr2Mo (also designated as GY4) is a high-performance alloy structural steel plate, primarily valued for its excellent combination of strength, hardenability, and high-temperature stability. It is widely used in critical engineering applications where components are subjected to heavy loads, high temperatures, or complex stress conditions. Below is a detailed overview of its key characteristics, properties, and applications:

1. Chemical Composition

The alloying elements in 28Cr2Mo (GY4) are carefully balanced to enhance its mechanical properties, with the main components typically including:

 

Chromium (Cr, ~2%): Improves hardenability, corrosion resistance, and high-temperature strength; promotes the formation of stable oxide layers to resist oxidation at elevated temperatures.

Molybdenum (Mo, ~0.5-0.8%): Enhances hardenability, reduces temper brittleness, and improves creep resistance (critical for high-temperature applications).

Carbon (C, ~0.25-0.30%): Provides a foundation for strength through heat treatment, balancing hardness and toughness.

Trace elements (e.g., manganese, silicon): Aid in deoxidation, refine grain structure, and optimize processability.

 

 

 

 

 

 

 

 

2.Typical Applications

Due to its robust performance, 28Cr2Mo (GY4) steel plate is widely used in heavy machinery, power generation, and industrial equipment, including:

 

High-pressure vessel components: Such as flanges, headers, or thick-walled parts in boilers and pressure pipelines, where strength and pressure resistance are critical.

Heavy-duty machinery parts: Transmission shafts, gears, and hydraulic cylinder barrels in mining equipment, construction machinery, or metallurgical machinery, which bear heavy loads and occasional impacts.

High-temperature structural components: Parts in steam turbines, diesel engines, or industrial furnaces that operate under elevated temperatures and require creep resistance.

 

 

 

 

 

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