Grade S1/ 1.2550

S1 / 1.2550 (60WCrV8) is a high-performance shock-resisting tool steel specifically developed for applications involving heavy impact, repeated shock loading, and demanding working conditions. As part of the ASTM S-series, this tungsten-alloyed steel provides exceptional toughness, ductility, and resistance to chipping or cracking, making it highly suitable for tools subjected to continuous mechanical stress.

One of the key advantages of S1 tool steel is its outstanding shock resistance, allowing it to absorb high-impact forces without failure. This makes it ideal for tools such as chisels, hammers, and punches that are repeatedly struck during operation. Additionally, S1 offers a balanced combination of toughness and wear resistance, enabling it to perform effectively in both impact and light cutting applications.

Tool Steel

After heat treatment, S1 achieves a hardness range of 54–58 HRC while still maintaining excellent ductility. Its tungsten and chromium content enhances deep hardenability, ensuring uniform hardness even in larger sections. Furthermore, its ability to withstand rapid temperature changes makes it suitable for tools exposed to thermal shock, such as forging dies and hot working tools.

S1 / 1.2550 is widely used in industries requiring durable, impact-resistant tools, including forging, construction, and heavy manufacturing. Its reliability, strength, and resistance to wear and shock make it a preferred choice for high-performance tooling applications.

Key Properties

  • Exceptional Shock Resistance: Designed to withstand heavy impacts, vibrations, and sudden loads without cracking or failure.
  • Good Toughness & Wear Resistance: Provides an excellent balance between toughness and moderate wear resistance for impact and light cutting applications.
  • High Hardness (54–58 HRC): Achieves high hardness after heat treatment while maintaining ductility and resistance to chipping.
  • Thermal Shock Resistance: Performs well under rapid heating and cooling cycles, ideal for forging and hot work tools.
  • Deep Hardenability: Ensures uniform hardness even in large sections, reducing the risk of soft spots.
  • Good Machinability: Easy to machine in annealed condition, improving production efficiency.

Common Applications

  • Hot and cold chisels
  • Hammers and sledgehammer tools
  • Punches and drift tools
  • Hot forging dies
  • Riveting and boiler tools
  • Cold headers and upsetter tools
  • Heavy-duty woodworking tools
  • Shear blades for shock applications
  • Picks, axes, and impact knives

PUROHIT STEEL is a trusted name in the tool steel industry, with humble beginnings dating back to 1965 and over three decades of expertise in delivering high-quality materials and solutions. Today, the group operates multiple well-established units, maintaining a vast inventory ranging from hot work and cold work tool steels to specialized materials. Known for reliability and strong technical support, PUROHIT STEEL caters to the diverse requirements of small, medium, and large-scale industries. The company specializes in manufacturing moulds and tooling components using premium grades such as Grade S1/ 1.2550 which is ideal for applications including injection moulds (medium to large size), blow moulds, low-pressure die-casting dies, automotive moulds, tooling plates, extrusion dies, machine parts, shafts, and general tooling components. With a focus on quality, performance, and precision, PUROHIT STEEL continues to deliver durable and efficient tooling solutions.