The carbon content in these bolts typically ranges from 0.05% to 2.0%, and different carbon levels produce different grades of bolts with varying mechanical properties.

Composition of Carbon Steel Bolts

Iron (Fe): Main component providing the base metal structure

Carbon (C): Increases hardness and tensile strength as carbon content rises

Manganese (Mn): Improves toughness and wear resistance
Silicon (Si) & Sulfur (S): Present in small amounts for improved machinability

Properties of Carbon Steel Bolts

Types of Carbon Steel Bolts by Carbon Content

Low-Carbon Steel Bolts (Mild Steel):

Carbon content: 0.05%–0.3%

Features: Ductile, weldable, low strength

Applications: General-purpose fastening, non-critical structures

Medium-Carbon Steel Bolts:

Carbon content: 0.3%–0.6%

Features: Higher strength, better wear resistance, can be heat-treated

Applications: Automotive components, machinery

High-Carbon Steel Bolts:

Carbon content: 0.6%–1.0%

Features: Very hard, strong, lower ductility

Applications: Heavy-duty industrial equipment, high-strength joints

We are a custom bolt manufacturer specializing in carbon steel and bolts of various materials and types. If you have any questions, please contact us.