The C45 and Ck45 medium carbon hot rolled steel coil serves manufacturers of forged and machined components that are hardened after forming. Zhengde controls the carbon range from 0.42 to 0.50 percent and manages rolling and coiling temperatures so hardness stays uniform from the head to the tail of every coil, giving machinists predictable tool life and forgers consistent flow behavior. A spheroidize annealing option transforms the carbide into a fine globular structure that improves cold formability and machining, and controlled furnace atmospheres limit surface decarburization so finished parts keep their designed surface hardness. Thicknesses from 3mm to 25mm are available, and ultrasonic inspection can be added for critical shaft and gear blank applications. Each heat is documented with chemistry, hardness and mechanical test results.

• Uniform Hardness Across Coil Controlled rolling and cooling give consistent hardness and machinability from the head to the tail of every coil
• Predictable Heat Treatment Response Balanced medium carbon chemistry delivers stable results through quenching and tempering, induction hardening and normalizing
• Spheroidize Annealing Option Fully spheroidized carbide structure is available for cold forging and severe machining operations, improving tool life and flow
• Low Decarburization Controlled furnace atmosphere limits surface decarburization so finished machined parts keep their designed surface hardness
• Sound Internal Quality Ultrasonic tested material can be supplied for critical forged shafts and gear blanks on request
• Complete Certification Mill certificates document chemistry, hardenability and mechanical test results for quality audits

C45 and Ck45 coils are blanked, forged or machined into medium strength components that are later hardened: gear blanks, pinion shafts, hydraulic piston rods, coupling halves, spindles, fasteners and general machine parts. After quenching and tempering the steel reaches 550-700 MPa tensile strength depending on section, making it a dependable choice for agricultural machinery, construction equipment and industrial transmission components.

Production follows EN 10083-2 with per-heat chemical analysis and hardness verification. Zhengde operates an ISO 9001:2015 quality system, and optional ultrasonic inspection and third party surveys by SGS or BV can be arranged. Packaging is standard seaworthy export specification with rust protection; delivery is 7-15 days for stock sizes and 20-30 days for production.