Round Bar

42CRMO4

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., ï 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.