MATERIAL INTRODUCTION
C75S Steel Strip
High carbon spring steel strip, magnetic, density: 7.85 g/cm³.
- Grade
- C75S
- Thickness
- 0.08–3.0 mm
- Width
- 2 mm
Chemical Composition (wt%)
| C | Si | Mn | P | S | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|
| 0.70～0.80 | 0.15～0.35 | 0.60～0.90 | ≤0.025 | ≤0.025 | ≤0.40 | ≤0.40 | ≤0.10 |
Applicable Standards
| Standard / Designation |
|---|
| EN 10132-4 |
| DIN 17222 |
| Material No.1.1248 |
| approximate equivalent AISI 1075 |
Tempers & Hardness
| Temper | Hardness / Characteristics |
|---|---|
| ANN (Annealed + LC skin passed) | HV ≤200, good ductility for bending & stamping before heat treatment |
| 1/4H | 240–280 HV |
| 1/2H | 280–330 HV |
| 3/4H | 330–380 HV |
| FH (Full Hard) | ≥380 HV |
(as-supplied)
Note: Hardenable by quenching & tempering, achievable HRC46～53. Higher elastic limit and strength than C67S with slightly lower toughness. 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 | standard surface 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
- European high-carbon spring steel grade. Higher carbon content than C67S for higher elastic limit and tensile strength, suitable for high-load thin shrapnels. Strict impurity control ensures stable fatigue performance
- 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, strong spring-back, demanding forming process, higher brittleness risk than C67S
Applications
Retaining circlips, precision snap rings, high-load spring shrapnels, saw blade blanks, textile machine springs, clutch springs, tape measure strips, blade blanks
Material Comparison
| Grade | Key Characteristics |
|---|---|
| C75S | Higher carbon, better strength & elasticity than C67S, lower toughness |
| C67S | Lower carbon, better toughness for springs requiring higher ductility |
| 65Mn | Domestic spring steel, superior hardenability, better for thicker strips |
| 301 | Stainless spring material, corrosion-free, higher cost |