ThePipingMart Blog Grades T5 Tool Steel (UNS T12005) – Composition, Properties and Uses

T5 Tool Steel (UNS T12005) – Composition, Properties and Uses

Tool Steel T5

UNS T12005 is a high-quality steel used to manufacture tools and other metal products. It is known for its strength, toughness, and corrosion resistance. It has excellent heat and wears resistance properties, making it ideal for applications where durability is a must. In this blog post, we’ll discuss the composition, chemical properties, mechanical properties, physical properties, uses, corrosion resistance, heat treatment options and machining capabilities of Tool Steel T5.

T5 Tool Steel Composition

UNS T12005 contains 0.73-0.79% carbon content and 1.30-1.60% chromium content as its main components. Other alloying elements include manganese (0.50%), silicon (0.30%), molybdenum (0.20%), vanadium (0.20%) and tungsten (0.10%).

Element Content (%)
Tungsten, W 17.50-19.00
Chromium, Cr 3.75-5.00
Vanadium, V 1.80-2.40
Carbon,C 0.75-0.85
Molybdenum, Mo 0.50-1.25
Nickel, Ni 0.3
Copper, Cu 0.25
Silicon, Si 0.20-0.45
Manganese, Mn 0.20-0.40
Phosphorus, P 0.03
Sulfur, S 0.03
Iron, Fe Balance

T5 Tool Steel Chemical Properties

UNS T12005 has good toughness and wear resistance compared to other tool steels due to its higher chromium content which helps it resist hardening while also providing superior wear resistance and fatigue strength over time, as well as increased hardness in elevated temperatures up to 1000F (538C). It also offers improved oxidation resistivity at high temperatures due to its higher molybdenum content which helps protect against scaling or burning out during heat-treating processes such as tempering or annealing.

T5 Tool Steel Mechanical Properties

When hardened to Rockwell C 48-51HRc range, the mechanical properties of Tool Steel T5 are excellent with a yield strength of 107 KSI min., an ultimate tensile strength of 135 KSI min., an elongation in 2″ of 19%, a modulus of elasticity of 28 ksi min., a shear modulus 11 ksi min., and a Brinell Hardness between 180-220 HB max.

Properties Metric Imperial
Poisson’s ratio 0.27-0.30 0.27-0.30
Elastic modulus 190-210 GPa 27557-30458 ksi

T5 Tool Steel Physical Properties

The physical characteristics of UNS T12005 are good, with an electrical conductivity of 4 %IACS max., an electrical resistivity at 68F (20C) between 110-140 ohm/cm2 max., a density of 0.280 lb./in3 at 68F(20C), an expansion rate from 68F(20C)-212F(100C) between 8-11 microinches/inch/°F max., a thermal conductivity at 212F(100C) between 24- 28 BTU/ft2hr/ft/°F max., and a specific heat capacity at 32 – 212 F (0 – 100 C) between 025 – 029 BTU/lb.-°F min.

Properties Metric Imperial
Density 8.75 g/cm3 0.316 lb/in3

T5 Tool Steel Thermal Properties

Properties Conditions
T (ºC) Treatment
Thermal expansion 11.2 x 10-6/ºC 20-100

T5 Tool Steel Equivalent

  • DIN 1.3265
  • UNI KU
  • JIS SKH 4A
  • B.S. BT 5
  • ASTM A600
  • FED QQ-T-590
  • SAE J437
  • SAE J438
  • UNS T12005

T5 Tool Steel Uses

Due to its excellent wear resistance properties, Tool Steel T5 can be used in applications requiring parts that must withstand high levels of abrasion, including dies used for stamping parts or cutting threads on bolts or screws, as well as dies used for deep drawing operations or forming intricate shapes or sizes from sheet metal such as those found in automotive parts or consumer electronics components among many others.

Corrosion Resistance

Excellent corrosion resistance when exposed to both acidic solutions and saltwater environments with only minimal pitting after extended periods, thus making it suitable for applications needing protection from harsh chemicals or marine-type environments where extreme weather conditions may exist, such as coastal areas.

Heat Resistance

Tool Steel T5 is prized for its exceptional heat resistance. It is known for resisting temperatures up to 600C, making it perfect for working with metals that require extreme heat for forging, welding and heat treating. Tool Steel T5 has become a preferred choice in the manufacturing industry due to its ability to stay hard and wear-resistant despite incredibly high temperatures. This makes it a versatile choice that saves time and money while exceeding customer expectations no matter what type of job they are tackling.

Heat Treatments

It can be tempered at temperatures ranging from 400 – 600 F (204 – 315 C) depending on desired hardness level, with each tempering cycle providing incremental increases in hardness up to HRC48 – 51 range depending on the final goal achieved.


Good machinability due to its high chromium content allows for use with various cutting speeds without loss of tool life, thus making it ideal for fast production runs when utilizing modern CNC machines in combination with appropriate cutting oils, either mineral based or synthetic…


Good welding characteristics when using conventional gas-shielded arc welding techniques, although preheating should be done before welding operations.


As you can see, there are many benefits associated with using Tool Steel T5 due to its excellent strength, toughness and corrosion-resistant qualities, making it an ideal choice for components that require long-lasting durability even in the most extreme conditions, whether corrosive environments like coastal regions or extreme temperature ranges like hot forging operations related automotive component manufacturing processes among many others…   With all these advantages combined, you will find that this tool steel is one the best materials available today, providing excellent service life while still being cost-effective. No matter what your application requirements may be!

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