ThePipingMart Blog Grades H11 Tool Steel (UNS T20811) – Composition, Properties and Uses

H11 Tool Steel (UNS T20811) – Composition, Properties and Uses

Tool Steel H11

Tool Steel H11 is an air-hardening, hot work 5% chromium tool steel. It combines excellent shock and abrasion resistance with good red hardness making it ideal for die-casting. It has high toughness and flexibility, making it an excellent choice for many applications, such as dies, punch plates, and extrusion tools. Let’s take a closer look at the composition, mechanical properties, physical properties, uses of corrosion resistance, heat resistance, heat treatment, and machining of Tool Steel H11.

H11 Tool Steel Composition

H11 Tool Steel  also called as Chromium Hot-Work Steels (UNS T20811) contains 5% chromium as its primary alloying element, along with smaller amounts of manganese (0.35%), molybdenum (0.2%), carbon (0.5%), and silicon (1%). It also contains trace elements such as sulfur (0.15%) and phosphorous (0.03%). The addition of chromium gives Tool Steel H11 improved wear resistance compared to other tool steels without chromium added to their compositions.

Element Content (%)
Carbon, C 0.33-0.43
Manganese, Mn 0.20-0.50
Silicon, Si 0.80-1.20
Chromium, Cr 4.75-5.50
Nickel, Ni 0.3
Molybdenum, Mo 1.10-1.60
Vanadium, V 0.30-0.60
Copper, Cu 0.25
Phosphorous, P 0.03
Sulfur, S 0.03
Iron, Fe Balance

H11 Tool Steel Mechanical Properties

H11 Steel has excellent shock resistance due to its high toughness levels and its abrasion-resistant properties from the presence of chrome in its composition. Its tensile strength is rated at 140ksi, while its yield strength comes in at 120ksi when heated up to 1600°F before being cooled off rapidly via an air quench method. The elongation rate of this alloy is 21%.

Properties Metric Imperial
Hardness, Rockwell C (air cooled from 982°C, 45 mins) 52.5 52.5
Hardness, Rockwell C (air cooled from 1010°C, 45 mins) 56 56
Hardness, Rockwell C (air cooled from 1038°C, 45 mins) 57 57
Modulus of elasticity 207 GPa 30000 ksi
Modulus of elasticity (@538°C/1000°F) 159 GPa 23000 ksi
Modulus of elasticity (@204°C/400°F) 190 GPa 27500 ksi
Charpy impact (V-notch; air cooled from 1010°C;535°C temper temperature) 13.6 J 10.0 ft-lb
Charpy impact (V-notch; air cooled from 1010°C;650°C temper temperature) 27.1 J 20.0 ft-lb
Charpy impact (V-notch; air cooled from 1010°C;370°C temper temperature) 33.9 J 25.0 ft-lb
Machinability (1% carbon steel) 75.0 – 80.0% 75.0 – 80.0%
Poisson’s ratio 0.27-0.30 0.27-0.30

H11 Tool Steel Physical Properties

The density of this alloy h11 is 0.283 lb/in3 or 7800 kg/m3, while the melting point ranges between 2600-2700°F (1425-1480°C). This alloy has a Rockwell Hardness rating of A 82–86 HRC depending on how much it was hardened by heat treatment after casting or forming processes have been completed on it before hardening it further through heating and cooling methods that are part of heat treatment processes for this type of steel alloy composition.

Properties Metric Imperial
Density 7.81 g/cm3 0.282 lb/in3
Melting point 1427°C 2600°F

H11 Tool Steel Thermal Properties

Properties Metric Imperial
Thermal expansion (@20-100ºC/68-212ºF) 11.9 x 10-6/ºC 6.63 µin/in°F
Thermal conductivity (@100ºC/212ºF) 42.2 W/mK 292.9 in/hr.ft².°F

H11 Tool Steel Equivalents

AFNOR Z 38 CDV 5 AMS 6485 SAE J438
DIN 1.2343 AMS 6487 SAE J467
UNI KU AMS 6488 UNS T20811
B.S. BH 11 FED QQ-T-570 ASTM A579
AMS 6437 SAE J437 MIL S-47262

H11 Tool Steel Uses

This alloy can be used for many applications including dies, punch plates and extrusion tools due to its high toughness and ductility levels combined with good wear resistance from the presence of chrome in its composition making it an ideal choice for these types of applications where precision is needed for durability purposes that are often encountered when dealing with dies or punch plates that need to maintain accuracy over long periods or multiple uses without the need to replace them too soon due to wear issues caused by friction during those uses through contact with other materials that may be present during such activities like pushing a material through a hole or cutting away parts from a larger piece using one’s own strength without any additional help from outside sources like machines that can make quick work out of tedious tasks like these but still require precision accuracy when doing so manually without any assistance from any kind external sources like machines etcetera.

Corrosion Resistance & Heat Resistance

This alloy has very good corrosion resistance due to the presence of chrome in its composition which helps protect against rusting caused by oxidation when exposed to moisture or water over extended periods time thus making it suitable for use outdoors even if temperatures begin fluctuate drastically between hot and cold climates which could otherwise cause damage if not taken into consideration prior usage planning stages part production process design phase before actual manufacturing begins order minimize risks associated potential failure resulting from improper precautions taken care prevent such occurrences happening first place leading costly repairs maintenance down line later date which would need addressed immediately order keep things running smoothly efficiently all times despite ever-changing environmental conditions might pose threat longevity products made using this particular metal alloys finish off topic lets now move onto looking what happens when subject matter heats up literally speaking next section discussing heat treatments followed shortly after introduction machining welding options available those interested exploring more information regarding subject matter read further below continue reading rest article learn more details related same.


Working with tool steel H11 can be a challenge for any machinist. It has special properties that make it an ideal material for highly demanding manufacturing operations but simultaneously yields exceptional results by providing high hardenability and excellent wear resistance. Achieving these results requires skilful attention at each step in the machining process – from the initial setup to cutter speed and feed selection to finishing. Attention to detail is required during milling due to its high wear resistance and hardness while allowing generous machine movability without losing structural integrity. The good news? With proper planning and technique, tool steel H11 machining can be done successfully, resulting in products built to last and exceed customer expectations.


Tool Steel H11 Welding is a demanding task that can provide an incredibly strong and durable finished product. The key to successful Tool Steel H11 Welding is to ensure that the welds are adequately preheated and thermally treated afterwards. This helps prevent potential cracking or distortion in the weld area once it’s cooled down. Using correct tools and a temperature-controlled work environment allows experienced professionals to finish the job quickly, safely and within the highest industry standards. The result is a product that will stay intact for many years of service.


In conclusion, Tool Steel H11 is an air-hardening hot work 5% chromium tool steel that provides excellent shock resistance along with abrasion resistance thanks to its high toughness levels combined with red hardness making it a great choice for many applications requiring precision durability during operations involving contact other materials which could end up wearing down quickly if not properly taken care before usage begins thus causing potential problems to let us never forget importance proper precautionary measures must always be taken into consideration part production process otherwise costly repairs maintenance might result in later date should anything unexpected occur meantime hope you enjoyed learning a bit about what Tool Steal H12 strong points were found useful provided helpful information we wish you best luck future endeavours explore further topics related same matter thank reading our blog post-bye now!

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