What Is AISI 4135 Steel?
AISI 4135 steel, a chromium-molybdenum steel, contains approximately 0.33-0.38% carbon. It falls under the category of alloy steel materials designed for mechanical structures.
Notable for its high yield point of at least 785 and a tensile strength exceeding 930, 4135 steel maintains its strength at temperatures around 932°F. This chromium-molybdenum steel stands out for its relative hardness and impressive mechanical properties compared to similar alloys. Mechanical properties describe a material’s behavior under external forces like heat, pressure, or tension.
When compared to stainless steel, 4135 steel is more prone to corrosion due to its lower chromium content. Unlike stainless steel, it lacks sufficient chromium to form a protective film, akin to skin, to guard against corrosion.
This grade includes variants like 4135H, where ‘H’ indicates that the steel has been subjected to hardenability testing.
Uses of AISI 4135 Steel
4135 steel’s widespread applications center around mechanical components, benefiting from its high hardness. It is commonly used in manufacturing nuts and hex bolts, where its chromium content lends enhanced corrosion resistance and hardness over iron.
Bicycle frames also utilize 4135 steel, exploiting its moderate flexibility. This flexibility allows the frame to absorb shocks and maintain comfort, especially on rough terrains or against obstacles. 4135 steel frames, providing shock absorption and less bodily strain, are preferred for longer-distance cycling compared to aluminum or carbon fiber alternatives.
Furthermore, 4135 steel is suitable for high-temperature and high-pressure environments, making it an excellent choice for engine components and aircraft landing gear parts.