Premium medium-carbon, chromium-vanadium tungsten-chrome tool steel offering exceptional impact toughness with moderate wear resistance for demanding shock-loading applications.
Comparable Standards
| Designation | Grade |
| AISI/SAE | S1 |
| DIN W.Nr. | 1.2550 |
| UNS | T41901 |
Chemical Composition (wt %)
|
C |
Mn | P (max) | S (max) | Si | Cr | W | V |
| 0.55–0.65 | 0.15–0.45 | 0.030 | 0.030 | 0.70–1.00 | 0.90–1.20 | 1.70–2.00 |
0.10–0.20 |
Mechanical & Physical Properties
| Property | Value |
| Density (@ 20 °C) | 7.89 g/cm³ |
| Hardness (annealed, HB) | 200–230 HB |
| Hardness (quenched & tempered, HRC) | 55–58 HRC |
| Vickers Hardness (HV) | 584 HV |
| Tensile Strength (UTS) | 2080 MPa |
| Yield Strength (0.2% offset) | 1800 MPa |
| Elongation at Break | 10 % |
| Elastic Modulus (E) | 190 GPa |
| Poisson’s Ratio (ν) | 0.29 |
Heat Treatment Guidelines
– Annealing: Heat uniformly to 710–750 °C, hold 1 h per 25 mm, furnace cool at 10–20 °C/h to 600 °C, then air cool.
– Forging: Preheat to 650–700 °C, heat to 980–1065 °C for forging; slow furnace or insulated cool to avoid cracking.
– Hardening: Preheat to 650 °C; austenitize at 900–950 °C, hold 10–20 min; quench in oil.
– Tempering: Double-temper at 150–250 °C (1 h per temper) to achieve 55–58 HRC and maximize impact toughness.
Typical Applications
– Cold shear knives & trimming tools
– Paper & wood cutting knives
– Ejector pins & air-hammer components
– Impact punches, dies & blanking tools
Supply Formats & Services
– Stock Shapes: Rounds (20–350 mm Ø), Flats (25×50 mm to 200×500 mm), Blocks (up to 2,000 kg)
– Custom Cutting: Precision bandsaw, water-jet to your drawing
– Value-Added Services: In-house forging & heat treatment, UT & MPI testing, hardness & microstructure analysis, pre-machining, surface grinding