MATERIAL INTRODUCTION
SK85 Steel Strip
High Carbon Tool Steel Strip, magnetic, density: 7.85 g/cm³.
- Grade
- SK85
- Thickness
- 0.08–3.0 mm
- Width
- 2 mm
Chemical Composition (wt%)
| C | Si | Mn | P | S | Cr | Ni | Cu |
|---|---|---|---|---|---|---|---|
| 0.80～0.90 | 0.10～0.35 | 0.10～0.50 | ≤0.030 | ≤0.030 | ≤0.30 | ≤0.25 | ≤0.25 |
Applicable Standards
| Standard / Designation |
|---|
| JIS G4401 |
| equivalent to GB T9A |
| European C90W1 |
Tempers & Hardness
| Temper | Hardness / Characteristics |
|---|---|
| ANN (Annealed, Soft Temper) | HV ≤210, suitable for bending & stamping before heat treatment |
| 1/4H | 240–280 HV |
| 1/2H | 280–330 HV |
| 3/4H | 330–390 HV |
| FH (Full Hard) | ≥390 HV |
(as-supplied)
Note: Hardenable by quenching & tempering, achievable HRC58～62, excellent wear resistance & high hardness. Low toughness and limited hardenability, thick strips easy to distort. Poor rust resistance; bluing, black oxide, phosphating or plating required.
Common Surface Finishes
| Surface | Description / Applications |
|---|---|
| 2B cold rolled bright finish | ideal for precision stamping |
| Blue tempered finish | widely used for saw blades, cutters and 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
- JIS high carbon tool steel, higher carbon than SK7 & C75S. Top-tier hardness and wear resistance after quenching, good edge retention with clean material
- No Cr/Ni, cost-effective. Easy to rust in humid conditions, anti-corrosion treatment mandatory
- Moderate machinability; extremely poor weldability. Hardness and elasticity lost after welding with high cracking risk, not for welded assemblies
- Strong spring-back and brittle, not suitable for repeated heavy bending; best performance for thin gauges
Applications
Hand saw blades, woodworking blades, cutter blanks, high-load spring shrapnels, clutch springs, textile needles, tape measure strips, thin scissor blades, wear-resistant shims, small stamping inserts
Material Comparison
| Grade | Key Characteristics |
|---|---|
| SK85 | High carbon, outstanding hardness & wear resistance, low toughness, for cutting edges & high-stress thin springs |
| SK7 | Lower carbon, better toughness, less chipping risk |
| C75S | European spring steel, better toughness than SK85, lower wear resistance |
| 65Mn | Higher manganese for better hardenability, preferred for thicker springs |