Under the same quenching and tempering process, 4340 can achieve a higher ultimate hardness, meaning 4340 steel is harder than 4140 steel. However, in practical applications, material selection is not simply a matter of "which is harder," but rather should consider: While meeting the necessary hardness/strength requirements, does the material also need higher toughness [...]
4340 steel exhibits excellent low-temperature toughness. 4340 steel, through quenching and tempering, achieves an excellent balance of strength and toughness. Benefiting from its low low-temperature brittle transition temperature, it maintains good impact resistance even at -40°C, effectively preventing low-temperature brittle fracture. This is mainly due to the synergistic effect of the nickel-chromium-molybdenum alloy system, [...]
4340 steel is suitable for making gears, especially heavy-duty gears that require high strength and toughness. After quenching and tempering, 4340 steel exhibits uniform overall properties and excellent core strength and toughness, enabling it to withstand high loads, impact loads, and fatigue stresses, perfectly matching the core performance requirements of gears. Furthermore, surface hardening [...]
4340M steel which is modified from AISI 4340 Steel,also known as 300M. As a low-alloy ultra-high-strength steel, 4340M steel, after quenching and tempering, can achieve a tensile strength exceeding 1860 MPa. Mechanical Performance Characteristics High Strength High Lateral Plasticity High Fracture Toughness Excellent Fatigue Performance Good Corrosion Resistance These properties are extremely [...]
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AISI 4340 steel is magnetic and stable. The microstructure of AISI 4340 is mainly pearlite/martensite/ferrite, a structure that naturally possesses strong ferromagnetism. Its strong magnetic nature remains unchanged regardless of whether it is hot-rolled, forged, or heat-treated.
AISI 4340 steel has poor corrosion resistance. The chromium content of 4340 steel is only 0.70%-0.90%, far lower than the stainless steel standard (10.5%). Therefore, it cannot form a dense passivation protective film, making it prone to rusting in humid, acidic, and alkaline environments. The core value of 4340 steel lies in its unparalleled [...]
Stainless steel has at least 10.5% Chromium, and the maximum carbon content is not more than 1.2%.The main characteristics for these kind materials are good rust resistance and corrosion resistance. It is clear that AISI 4340 is not stainless steel. AISI 4340 is defined as a heat-treatable low-alloy steel containing 0.8% Cr, 0.2% Mo [...]
The core difference between the two lies in the fact that 4340 steel contains a large amount of nickel (1.65-2.0%), while 4140 steel contains no nickel. This leads to a series of differences: Performance: 4340 has significantly better hardenability, strength (ultra-high strength grade), and toughness (especially at low temperatures) than 4140. Applications: 4140 [...]