C-55 Round Bar - Application: Industrial

C-55 refers to a medium carbon steel grade, commonly known by its EN 10083 standard as EN 1.0535, which offers high strength and hardness due to its carbon content (0.52-0.60%). While it has high wear and abrasion resistance and can be flame or induction hardened, its high carbon content results in poor weldability, requiring preheating and post-weld heat treatment to prevent cracking. It is also an equivalent to SAE 1055 and can be found in various forms like bars and plates.
Chemical Composition (Typical)
Carbon (C): 0.52% - 0.60%
Manganese (Mn): 0.50% - 0.80%
Silicon (Si): Max 0.40%
Phosphorus (P): Max 0.035%
Sulfur (S): 0.015% - 0.035%
Key Properties & Characteristics
Hardness & Strength: Achieves high hardness and strength after hardening due to its high carbon content.
Wear Resistance: Exhibits excellent wear resistance, making it suitable for heavy-load and high-wear applications.
Surface Hardening: Can be surface hardened via flame or induction methods to a high surface hardness (e.g., 58 HRC).
Weldability: Poor weldability due to its high carbon content; preheating and post-weld heat treatment are generally necessary to prevent cracking.
Equivalents
DIN: 1.0535
SAE/AISI: 1055
AFNOR: XC55
BS: 070M55
Common Forms Round bars, Flat bars, Heavy blocks, Plates, and Sheets and strips.
Typical Applications
Applications requiring higher mechanical strength and wear resistance.
Components that need a hard, wear-resistant surface and high core strength after heat treatment.