Short answer: Tool steel is a high-carbon, highly alloyed family engineered for hardness, wear resistance, and red hardness. HXSCO supplies water-, oil-, and air-hardening grades plus high-speed steel (HSS) in flat bar, round, and plate for dies, molds, cutting tools, and wear parts, with mill-test certification.
At a Glance
What Makes Steel a ‘Tool Steel’?
Tool steels are formulated with high carbon plus tungsten, molybdenum, chromium, and vanadium to stay hard and resist wear, deformation, and softening at temperature. They are heat-treated to very high hardness (often 58-65 HRC) so they can cut, form, or shape other materials without failing.
The Main Families
The chart contrasts the four families. Water-hardening (W, e.g. W1) is cheap and tough but softens in heat. Oil-hardening (O, e.g. O1) is stable and easy to machine. Air-hardening (A, e.g. A2/D2) gives low distortion and high wear resistance. High-speed (M/HSS) keeps its edge hot for cutting tools.
Supply Forms
- Flat bar & plate: for dies, blades, and wear strips.
- Round bar: for punches, shafts, and tool bodies.
- Pre-machined blocks: reduce finishing time for molds.
- HSS stock: rod and saw stock for cutting tools.
Typical Applications
Tool steel forms stamping and forming dies, injection molds, cutting and punching tools, shear blades, knives, drill bits, and gauges. See our metal hardness guide for how hardness maps to wear duty.
Sourcing Tool Steel from HXSCO
HXSCO stocks and sources tool steel across W, O, A, D, and M (HSS) families. Tell us the grade, form, dimensions, and quantity, and we will quote with heat-treatment and mill-test options.
Frequently Asked Questions
Dies, molds, cutting tools, punches, blades, and wear parts that must stay hard and resist abrasion under load.
Water-hardening (W), oil-hardening (O), air-hardening (A/D), and high-speed steel (M/HSS), chosen by distortion, wear, and heat needs.
High-speed and some air-hardening grades reach 60-65 HRC and keep hardness hot, making them the cutting-tool standard.
It can be welded with preheat and low-hydrogen practice, but heat-affected zones lose hardness; build-up and repair welding need careful procedure.
Flat bar, round bar, plate, and pre-machined blocks across W, O, A, D, and HSS grades, with certification.
Ready to source Tool Steel from HXSCO?
Send us the grade, form, dimensions, quantity, and any certification or test requirements. HXSCO replies with a competitive quote, lead time, and mill-test options.
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