ThePipingMart Blog Grades H25 Tool Steel (UNS T20825) – Composition, Properties and Uses

H25 Tool Steel (UNS T20825) – Composition, Properties and Uses

Tool Steel H25

If you’re looking for tough and durable tool steel, UNS T20825, also known as grade H25 tool steel, is what you need. This SAE-AISI H25 steel is ideal for applications that require high strength, wear resistance, and toughness. Its composition includes chromium, molybdenum, and vanadium, contributing to its excellent properties. With high hardness and an ability to maintain strength at high temperatures, H25 tool steel is often used to produce cutting tools, dies, and punches. Whether working in the automotive, aerospace, or defense industries, this versatile steel alloy could help you achieve precision and accuracy. Let’s look at what makes H25 Tool Steel so special and how users can benefit from its unique properties.

What Forms of H25 Tool Steel is Available at Piping Mart?

  • H25 Tool Steel Bar
  • H25 Tool Steel Pipe
  • H25 Tool Steel Tubes
  • H25 Tool Steel Valves
  • H25 Tool Steel Washers
  • H25 Tool Steel Flanges
  • H25 Tool Steel Fasteners
  • H25 Tool Steel Sheet Plates
  • H25 Tool Steel Pipe Fittings
  • H25 Tool Steel Forged Fittings

H25 Tool Steel Composition

Element Content (%)
Tungsten, W 14-16
Chromium, Cr 3.75-4.5
Vanadium, V 0.4-0.6
Nickel, Ni 0.3
Copper, Cu 0.25
Carbon, C 0.22-0.32
Manganese, Mn 0.15-0.4
Silicon, Si 0.15-0.4
Phosphorus, P 0.03
Sulfur, S 0.03

H25 Tool Steel Physical Properties

Properties Metric Imperial
Density 7.7-8.03 g/cm3 0.278 – 0.290 lb/in3
Melting point 1370-1400°C 2498-2552°F

H25 Tool Steel Mechanical Properties

Properties Metric Imperial
Tensile strength 1158 MPa 167.95 ksi
Yield strength 1034 MPa 150 ksi
Elongation 15% 15%
Modulus of elasticity 190-210 GPa 27557- 30457 ksi
Poisson’s ratio 0.27-0.3 0.27-0.3
Hardness (@25°C) 335 335

H25 Tool Steel Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient 16-17 µm/m°C 8.8-9.4 µin/in°F
Thermal conductivity 16 W/mK 110².°F

H25 Tool Steel Equivalents

  • ASTM A681
  • FED QQ-T-570

H25 Tool Steel Uses

One of the primary uses of Tool Steel H25 is for making cutting tools, punches dies, and other wear-resistant components for a variety of industries, including automotive parts manufacturing, die casting, and fabricating. In addition to its use in tooling applications, it is also often used for specialized parts in aircraft engines as well as other high-performance applications that require exceptional strength and wear resistance.

H25 Tool Steel Uses in Industries

  • Manufacturing Industry
  • Automotive Industry
  • Aerospace Industry
  • Construction Industry
  • Oil and Gas Industry

H25 Tool Steel Corrosion Resistance

Tool Steel H25 is highly resistant to corrosion due to its low carbon content and chromium content, which provides additional protection against rust formation. Additionally, when this alloy is quenched and tempered properly, it can provide even greater protection against corrosion due to the hardened surface layer that helps prevent oxidation from taking place.

H25 Tool Steel Heat Resistance & Heat Treatment

This alloy has excellent heat resistance thanks to its relatively low carbon content and high chromium content, which help reduce the risk of warping or cracking during heating processes such as hardening or tempering. Additionally, proper heat treatment will result in increased hardness which further enhances the alloy’s ability to resist wear and tear over time.

H25 Tool Steel Machining

Despite its high hardness, Tool Steel H25 can be machined with conventional equipment when given proper heat treatment prior to machining. With the right cutting tools and speeds, it can be machined with relative ease compared to other tool steels with similar properties. When machining this alloy, always ensure that all cutting tools are sharpened regularly in order to achieve optimal results without damaging the material being worked on.


Tool Steel H25 is a versatile alloy that offers superior strength and wears resistance as well as excellent corrosion protection when maintained properly. Its ability to withstand extreme temperatures makes it ideal for various industrial applications, including aircraft engine parts fabrication, die-casting molds, automotive parts manufacturing tools, punches, dies, and more. In addition to these qualities, it can also be easily machined if given proper heat treatment prior to working with the material, ensuring a more efficient process overall. The combination of these exceptional qualities makes Tool Steel H25 one of the best solutions for any number of industrial applications requiring durable yet easy-to-work materials like those found in parts manufacturing or engine-building industries today!

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