Q345 is a widely used low-alloy high-strength structural steel in China, known for its excellent mechanical properties, weldability, and cost-effectiveness. While it is not specifically classified as a "wear-resistant alloy steel plate" (like specialized wear-resistant steels such as NM360 or HARDOX), Q345 does exhibit moderate wear resistance in certain applications due to its high strength. Below is a detailed overview:

1. Basic Definition and Standard

Name: Q345 is named for its minimum yield strength: "Q" stands for "quxi" (yield in Chinese), and "345" indicates a minimum yield strength of 345 MPa.

Standard: It complies with Chinese standards such as GB/T 1591 (Low-Alloy High-Strength Structural Steels) and GB/T 3274 (Hot-Rolled Steel Plates and Sheets for General Use).

Alloy Variants: There are subtypes like Q345A, Q345B, Q345C, Q345D, and Q345E, which differ in impact toughness requirements (e.g., Q345E is suitable for extremely low-temperature environments, with impact tests at -40°C).

 

 

 

 

 

 

 

 

Mechanical Properties

Property	Minimum Requirement (Typical)
Yield Strength	345 MPa (≥ 345 N/mm²)
Tensile Strength	470–630 MPa
Elongation (in 200mm)	≥ 21%
Impact Toughness	Varies by grade (e.g., Q345B: ≥ 34 J at 20°C; Q345D: ≥ 34 J at -20°C)

 

These properties make Q345 significantly stronger than ordinary carbon steel (e.g., Q235, with a yield strength of 235 MPa), enabling it to withstand higher loads and stresses.

 

 

Wear Resistance Performance

Moderate Wear Resistance: Q345's wear resistance is better than mild carbon steel (e.g., Q235) due to its higher strength and alloy content. However, it is not designed for extreme wear conditions (e.g., heavy abrasion from rocks or industrial slurries).

Enhancement Methods: For applications requiring improved wear resistance, Q345 plates can be surface-treated (e.g., quenching and tempering, hardfacing with wear-resistant alloys, or applying ceramic coatings) to increase surface hardness.

 

 

 

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