Half‑Hard Flat‑Capable Spring Steel Strip

 

Product overview

Semi-hard half soft steel strip is processed by controlled cold rolling without full annealing, reaching medium hardness status with balanced toughness and rigidity. Different from super soft fully annealed strip and high-hard quenched strip, it keeps good flatness after stamping and forming, avoiding bending distortion, which is the preferred raw material for various flat, straight mechanical parts. We provide full grades and flexible size customization for flat springs, flat shims, straight locating hardware components.

Material & Executive Standard

65Mn / 60Si2Mn	GB/T1222-2016
C67S	EN10132-2021
SK85	YB/T5058
40Mn	GB/T711-2017
50#	GB/T699-2015

Same executive standards as annealed strip for each steel grade. Semi-hard cold rolling process to achieve medium hardness, stable flatness, original surface finish without additional coating, thickness 0.15~3.0mm, customized slitting service.

Features & Advantages

Medium Balanced Hardness: Optimal match of hardness and toughness, keep flat after stamping for straight parts. Stable Flatness: Less internal stress, finished flat parts with low deformation rate. Complete Steel Grades: Full spring steel & carbon steel options for diversified production requirement. Flexible Size Custom: Slitting & cutting to length available for customer’s specific dimension. Convenient Post Processing: Suitable for punching, blanking without subsequent heat treatment for regular flat parts.

Application

Mainly used for flat washers, flat springs, straight hardware spacers, mechanical flat locating parts, auto flat fittings and various precision straight stamped components.