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25MoCr4 alloy structural steel
25MoCr4 (1.7325) structural steel is a high-performance alloy steel widely used in machinery manufacturing and engineering, renowned for its excellent strength, toughness, and wear resistance. It is particularly well-suited for components subjected to high loads and dynamic stresses, such as gears, shafts, connecting rods, and other critical mechanical parts. The following sections provide a comprehensive overview of 25MoCr4 structural steel, covering its material characteristics, chemical composition, mechanical properties, heat treatment processes, and application areas.
Chemical composition of 25MoCr4 structural steel:
Carbon (C) content is approximately 0.22%–0.29%,
Manganese (Mn) content is 0.60%–0.90%,
Silicon (Si) content is 0.10%–0.40%,
Chromium (Cr) content is 0.90%–1.20%,
Molybdenum (Mo) content is 0.15%–0.30%,
along with small amounts of phosphorus (P) and sulfur (S).
The addition of chromium and molybdenum significantly enhances the steel's hardenability, strength, and heat resistance, enabling it to maintain stable performance under high-temperature and high-stress conditions.
Mechanical properties of 25MoCr4 structural steel:
Tensile strength typically ranges from 800 to 1000 MPa,
Yield strength can exceed 600 MPa,
Elongation is approximately 12%–15%.
Machining and welding properties of 25MoCr4:
25MoCr4 structural steel exhibits good machinability and can be shaped using conventional machining methods such as turning, milling, and drilling.
Regarding welding, appropriate preheating and post-weld heat treatment measures are required to prevent welding cracks and the degradation of properties. The use of low-hydrogen electrodes is generally recommended; the workpiece should be preheated to 200–300°C before welding and subjected to stress-relief annealing afterward.
Chemical composition of 25MoCr4 structural steel:
Carbon (C) content is approximately 0.22%–0.29%,
Manganese (Mn) content is 0.60%–0.90%,
Silicon (Si) content is 0.10%–0.40%,
Chromium (Cr) content is 0.90%–1.20%,
Molybdenum (Mo) content is 0.15%–0.30%,
along with small amounts of phosphorus (P) and sulfur (S).
The addition of chromium and molybdenum significantly enhances the steel's hardenability, strength, and heat resistance, enabling it to maintain stable performance under high-temperature and high-stress conditions.
Mechanical properties of 25MoCr4 structural steel:
Tensile strength typically ranges from 800 to 1000 MPa,
Yield strength can exceed 600 MPa,
Elongation is approximately 12%–15%.
Machining and welding properties of 25MoCr4:
25MoCr4 structural steel exhibits good machinability and can be shaped using conventional machining methods such as turning, milling, and drilling.
Regarding welding, appropriate preheating and post-weld heat treatment measures are required to prevent welding cracks and the degradation of properties. The use of low-hydrogen electrodes is generally recommended; the workpiece should be preheated to 200–300°C before welding and subjected to stress-relief annealing afterward.
