AISI 1018 mild/low carbon steel has excellent weldability and produces a uniform and harder case and it is considered as the best steel for carburized parts. AISI 1018 mild/low carbon steel offers a good balance of toughness, strength and ductility. Provided with higher mechanical properties, AISI 1018 hot rolled steel also includes improved machining characteristics and Brinell hardness.
Factor of safety for any structure is generally 2/3rd of specified yield strength.
Factor of safety depends on the application/ component not the material. You have to calculate the stresses and compare it to the allowable strength of the material while considering a well-defined FOS. For example, design of hoisting and lifting equipment requires using FOS of 5.
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