S1 Tool Steel
S1 is a premium air-hardening cold-work tool steel engineered through special alloying and heat treatment processes. Its core composition features precisely controlled carbon content, synergistic key alloying elements molybdenum and tungsten, alongside optimised silicon and manganese levels, conferring exceptional comprehensive properties. Most notably, it exhibits unparalleled impact toughness. Under repeated heavy impacts, S1 effectively absorbs shock energy, resists crack initiation and propagation, and prevents sudden fractures that could cause production downtime and safety hazards. Concurrently, it exhibits outstanding wear resistance, enduring prolonged abrasion under high stresses, alongside excellent hardenability (typical hardness range: 58-60 HRC). This ensures dimensional stability and enduring performance under demanding conditions.
Product Description
Xiri Tool Steel is a leading supplier of AISI S1 tool steel in China. This grade is a type of high-toughness and impact-resistant tool steel, suitable for tools that are subjected to intense impacts and vibrations (such as pneumatic tools, punches, chisels).
Whether you need S1 flat bars, S1 steel plates, or forged rounds, we provide custom dimensions with machining or grinding services. Our materials are strictly tested to ensure premium metallurgical structure.
S1 is a premium air-hardening cold-work tool steel engineered through special alloying and heat treatment processes. Its core composition features precisely controlled carbon content, synergistic key alloying elements molybdenum and tungsten, alongside optimised silicon and manganese levels, conferring exceptional comprehensive properties. Most notably, it exhibits unparalleled impact toughness. Under repeated heavy impacts, S1 effectively absorbs shock energy, resists crack initiation and propagation, and prevents sudden fractures that could cause production downtime and safety hazards. Concurrently, it exhibits outstanding wear resistance, enduring prolonged abrasion under high stresses, alongside excellent hardenability (typical hardness range: 58-60 HRC). This ensures dimensional stability and enduring performance under demanding conditions.
Chemical Composition of AISI S1 tool steel
| C | Si | Mn | Cr | P | S | Mo | V | W |
| 0.40-0.55 | 0.15-1.20 | 0.10-0.40 | 1.00-1.80 | max 0.030 | max 0.030 | max 0.50 | 0.15-0.30 | 1.50-3.00 |
Supply Form & Size Range of AISI S1 tool steel
We supply S1 steel in various forms to meet your manufacturing needs:
Round bar: Diameter 16mm – 800mm
Steel Plate / Flat: Thickness 16mm – 400mm x Width 100mm – 800mm
Surface: Black, Peeled, Rough machined or Grinded.
Delivery Condition: Annealed (Hardness 217 HB max.)
Core Performance and Applications of S1 Tool Steel
The Heart of Stamping Dies (particularly under impact conditions): Punches, dies, blanking dies… In stamping operations subjected to immense impact forces, S1 steel’s impact resistance is its core value, significantly extending die life and reducing unplanned downtime.
The soul of shearing tools:
Shear blades and cutting edges for metal plates and bars endure constant impact loads and abrasion. S1 steel delivers the perfect balance of toughness and wear resistance.
Guardian of forging dies:
During hot or cold forging, dies endure immense mechanical and thermal shocks. S1 steel’s high toughness and excellent thermal shock resistance form the foundation of its reliable performance.
The Vanguard of Rock Drilling and Mining:
Pneumatic hammer bits, drilling tools, and similar equipment operate in exceptionally harsh environments. S1 steel’s outstanding impact resistance and wear resistance are crucial for maintaining sharpness and durability under high-stress impacts.
Other Impact-Resistant Applications:
It is also widely used in cold-working tools, fixtures, bushings, and critical components of heavy machinery requiring high toughness.
Our advantages in Processing S1 Tool Steel
Recognising that S1 steel is frequently deployed in life-critical applications, we have established comprehensive quality defences throughout the entire process, from raw materials to finished products:
Raw Material Traceability and Selection: Only premium raw materials with stable chemical composition and high purity are selected. Strict testing of harmful element content lays the foundation for exceptional performance.
Precision Smelting and Casting: Advanced smelting techniques (such as electric furnace smelting combined with ladle refining) control gas content and inclusions, ensuring molten steel purity. Precisely controlled casting processes guarantee uniform and dense internal microstructures.
Rigorous Heat Treatment Process: Heat treatment is pivotal to unlocking S1 steel’s potential. We precisely control austenitisation temperature, holding time, and quenching cooling rates (particularly leveraging its air-hardening properties), complemented by precise tempering processes. This ensures the steel achieves an optimal combination of hardness and toughness. Each batch undergoes stringent metallographic microstructure and hardness testing.
Dual non-destructive testing: Finished steel must pass ultrasonic testing (UT) to confirm freedom from critical internal defects such as cracks or porosity, and absence of surface micro-cracks.
Full traceability: Comprehensive quality tracking records are maintained from raw material furnace numbers to final product batches, ensuring every steel piece is traceable and verifiable.
Not sure about the best equivalent for your application?
Why Manufacturers Choose Huangshi Xiri
Huangshi Xiri combines international-standard steel grades, a complete tool steel portfolio, strict quality control and reliable global supply. We match DIN / JIS / AISI equivalents precisely, offer cutting and heat-treatment services, and control every step from smelting to inspection. With stable capacity, on-time delivery and responsive technical support, we help manufacturers reduce risk, save costs and run production with confidence.
Contact Us
Contact Huangshi Xiri today for quotations, grade selection and technical support on tool steel, mold steel and alloy steel. Whether you need samples, cutting-to-size service or long-term supply for your projects, our engineers and sales team are ready to respond quickly with professional advice and reliable solutions for your manufacturing needs.
