CK55 Steel Strip

CK55 steel strip is a carbon-manganese spring steel grade supplied in cold-rolled, hardened and tempered condition, with a typical tensile strength of 700 to 900 MPa and a hardness range of 250 to 300 HB. This strip is delivered in coil or cut lengths, with thicknesses commonly ranging from 0.10 mm to 6.00 mm and widths up to 600 mm, as per the mill’s capability and the buyer’s order. The material conforms to DIN EN 10132-3 and is used where high elasticity, fatigue resistance and wear resistance are required under static or dynamic loads.

The composition features a carbon content of approximately 0.55 % and manganese around 0.70 %, which together produce a fine, uniform microstructure after heat treatment. Surface finish is typically cold-rolled bright or shot-blasted, with a standard roughness Ra of 0.8 to 1.6 µm. Coils are packaged on wooden or steel pallets, wrapped in waterproof paper and steel straps, with each coil weighing up to 2.5 tonnes. Standard tolerances on thickness are ±0.05 mm for material below 1 mm and ±0.10 mm for thicker gauges.

Industrial users source CK55 strip for the production of leaf springs, coil springs, snap rings, lock washers and precision stamped components in automotive, agricultural machinery and general engineering sectors. Buyers should confirm coil inner diameter (commonly 406 mm or 508 mm), edge condition (mill edge or slit edge) and whether the material is supplied in the annealed, hardened or pre-tempered state. Incoterms such as FOB Qingdao or CIF are negotiable, with lead times depending on the mill’s rolling schedule.

Taian Henson Metal Co., Ltd. is a China-based supplier specialising in cold-rolled steel strips, coils and slitted products for industrial and automotive applications. The company operates from Taian in Shandong province, supplying domestic and export markets with materials that meet international standards for spring and engineering steels.

The supplier profile indicates an imported tier classification with a harbor trust level, reflecting verified business registration and trade history. No response rate or average response hours are recorded in the current data, so buyers are advised to contact the supplier directly for confirmations on availability, mill certificates and delivery schedules. The firm does not list additional certifications beyond the standard compliance noted in its product descriptions.