Innovative Application and Selection Guide of High-Strength Carbon Steel Plate in Heavy Machinery Manufacturing
release time：
2025-09-05 17:26
I. Definition and Characteristics of High-Strength Carbon Steel Plate
High-strength carbon steel plate refers to high-strength steel, such as Q460 steel, that exhibits excellent comprehensive mechanical properties, particularly in the normalized or normalized and tempered state. This type of steel typically contains a carbon content between 0.60% and 1.70%. It can be quenched and tempered, exhibiting excellent hardness and compressive strength.
Key properties include:
High strength: After quenching and tempering, the yield strength reaches ≥785 MPa, and the tensile strength can reach 930-1080 MPa.
High elasticity and wear resistance: Suitable for high-stress and abrasive environments.
Good weldability: Can be joined by arc welding and gas shielded welding.
Hardenability: Oil quenching critical diameter is 10-28 mm, while water quenching can reach 24-49 mm.
II. Traditional Applications in Heavy Machinery Manufacturing
High-strength carbon steel plate has a wide range of applications in heavy machinery manufacturing, including:
Construction machinery: Used in bucket plates, blades, side blades, and other components of excavators, loaders, and bulldozers.
Hoisting machinery: Used in booms and structural components of truck cranes and tower cranes.
Mining machinery: Used in the manufacture of wear-resistant parts to extend equipment life. Metallurgical Equipment: Key load-bearing components in heavy equipment such as rolling mills and continuous casting machines.
Transportation Machinery: Used in the manufacture of key components such as heavy truck frames and drive shafts.
III. Innovative Applications and Technological Breakthroughs
In recent years, high-strength carbon steel plates have seen a number of innovative applications in heavy machinery manufacturing:
Ultra-High-Strength Steel Plate Applications: Liangang's LG1300QT ultra-high-strength steel plate has been successfully used in the manufacture of booms for large-tonnage truck cranes, achieving a major breakthrough in material performance.
700L Steel Plate Applications: This new high-strength carbon steel plate performs exceptionally well in loader buckets and bulldozer track shoes, balancing the demands of strength and toughness.
Large Medium-Thick Steel Plate Development: Shandong Iron and Steel Co., Ltd. has developed high-strength medium-thick steel plates for large-scale machinery and equipment. These plates have been used in the manufacture of key components for major projects and equipment in energy, transportation, and national defense.
Surface Treatment Technology: Advanced surface treatment processes, such as carburizing and quenching, achieve surface hardnesses of 58-62°C. HRC, while maintaining high core toughness.
IV. Selection Guide and Considerations
1. Key Selection Factors
When selecting high-strength carbon steel plate, consider the following factors:
Load Conditions: Select steel with the appropriate strength grade based on the static, dynamic, and impact loads to be sustained.
Environmental Conditions: Consider environmental factors such as operating temperature, corrosion, and wear.
Processing Requirements: Evaluate the feasibility of processing methods such as welding, cutting, and forming.
Cost-Effectiveness: Optimize material costs while meeting performance requirements.
2. Specific Selection Recommendations
High-stress components such as gears, bearings, and crankshafts recommend high-carbon manganese steels such as 50Mn2 with a yield strength of ≥785 MPa after quenching and tempering.
Welded structural components: Choose low-carbon alloy steels such as 20Cr with a carbon content of 0.18%-0.24% to ensure good weldability.
Wear-resistant components: Consider wear-resistant steel plates such as NM500 with a Brinell hardness of 500 HBW.
Large structural components: Choose tempered high-strength steel plates such as S550Q for excellent weldability and toughness.
3. Processing and Usage Precautions
Welding Process: Temperature and speed must be controlled to avoid cracking. Preheating and post-heat treatment should be performed as necessary.
Heat Treatment Process: Quenching and tempering (quenching + tempering) is typically used. Be mindful of overheat sensitivity and temper brittleness.
Cold Working Limitations: Cold deformation has low plasticity, so the amount of deformation must be controlled.
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