MATERIAL INTRODUCTION
C67S Steel Strip
High carbon spring steel strip, magnetic, density: 7.85 g/cm³.
- Grade
- C67S
- Thickness
- 0.08–3.0 mm
- Width
- 2 mm
Chemical Composition (wt%)
| C | Si | Mn | P | S | Cr | Ni |
|---|---|---|---|---|---|---|
| 0.65～0.73 | 0.15～0.35 | 0.60～0.90 | ≤0.025 | ≤0.025 | ≤0.40 | ≤0.40 |
Applicable Standards
| Standard / Designation |
|---|
| EN 10132-4 |
| DIN 17222 |
| Material No.1.1231 |
| approximate equivalent AISI 1070 |
Tempers & Hardness
| Temper | Hardness / Characteristics |
|---|---|
| ANN (Annealed + LC skin passed) | HV ≤200, good ductility for bending & stamping before heat treatment |
| 1/4H | 230–270 HV |
| 1/2H | 270–320 HV |
| 3/4H | 320–370 HV |
| FH (Full Hard) | ≥370 HV |
(as-supplied)
Note: Hardenable by quenching & tempering, achievable HRC44～52 with stable spring performance. Poor corrosion resistance; bluing, black oxide, phosphating or plating is required.
Common Surface Finishes
| Surface | Description / Applications |
|---|---|
| 2B cold rolled bright finish | ideal for precision stamping |
| Blue tempered finish | widely adopted for springs |
| Pickled finish | low cost for general parts |
Size Range & Precision Slitting (Edge trimming and deburring)
0.08–3.0 mmThickness
2 mmWidth
±0.002 mmTight tolerance available
Can be slit and precision cut per drawings. Please confirm required dimensions and achievable tolerances with your inquiry.
Material Features
- Classic European high-carbon spring steel. Slightly higher carbon than 65Mn for higher elastic limit and stable spring-back; lower manganese leads to slightly inferior hardenability vs 65Mn
- No Cr/Ni, moderate cost. Easy to rust in humid environment, anti-corrosion treatment mandatory
- Fair machinability; poor weldability. Welding destroys elasticity and brings cracking risk, not recommended for welded assemblies
- Noticeable work-hardening, excellent for thin precision spring strips with balanced fatigue property
Applications
Roller shutter springs, clutch shrapnels, circlips, retaining rings, textile machine springs, printing machine elastic components, precision shims, saw blade blanks
Material Comparison
| Grade | Key Characteristics |
|---|---|
| C67S | European spring steel grade, stable spring-back, preferred for mass precision springs |
| 65Mn | Higher manganese, better hardenability, mainstream domestic spring steel |
| S50C | Medium-high carbon steel, mainly for wear-resistant structural parts, lower elasticity |
| 301 | Stainless spring material, corrosion-free, higher cost |