AISI H11 tool steel is a 5% chromium hot work tool steel that is represented by its excellent impact toughness. Chromium hot-work tool steels are designated as group H steels according to the AISI classification system, and specified in ASTM A681 standard. The most commonly used chromium hot-work steels are H11 tool steel, H12 tool steel, and H13 steel, within the series from H1 to H19.
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If we compare between H11 and H13, H11 tool steel consists of less vanadium than the commonly used H13 hot work tool steel. This gives H11 steels the higher toughness, with some reduction in wear resistance and temper resistance. H11 tool steel is a deep-hardening, air-hardening steel and H11 alloy steel could be deep hardened by heat treatment and air-quenching. That gives minimal size change during heat treatment. H11 how work steel also has super resistance to thermal fatigue cracking and superb resistance to gross cracking and thermal shock when water cooled in service.
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1.ASTM A681 H11 Tool Steel Supply Range
H-11 Steels Round Bar: diameter 8mm&#;mm
H11 Steel Flat: thickness 16-500mm x width 200-800mm
H11 Steels Plate: thickness 16-500mm x width 200-810mm
Other dimension according to your requirements
Surface Finish: Black, Rough Machined, Peeled, Turned or as per given requirements.
2.AISI H11 Tool Steel Standard and Relevant Steel Specifications
Country USA German Japan British Standard ASTM A681 DIN EN ISO JIS G BS Grades H11/T 1./X37CrMoV5-1 SKD6 BH113.H11 Tool Steel and Equivalents&#; Chemical Composition
ASTM A681 C Mn P S Si Cr V W Mo H11/T 0.35 0.45 0.20 0.60 0.03 0.03 0.80 1.25 4.75 5.50 0.30 0.60 &#; 1.10 1.60 DIN ISO C Mn P S Si Cr V W Mo 1./X37CrMoV5-1 0.33 0.41 0.25 0.5 &#; &#; 0.80 1.20 4.8 5.5 0.3 0.5 &#; 1.10 1.50 JIS G C Mn P S Si Cr V W Mo SKD6 0.32 0.42 &#; 0.50 0.03 0.03 0.80 1.20 4.50 5.50 0.30 0.50 &#; 1.00 1.50 BS C Mn P S Si Cr V W Mo BH11 0.32 0.40 &#; 0.40 0.35 0.35 0.85 1.15 4.75 5.25 0.30 0.50 &#; 1.25 1.754. H11 Hot Work Tool Steel Properties
Physical Properties
Properties Metric Imperial Density 7.81 g/cm3 0.282 lb/in3 Melting point °C °FMechanical Properties
Properties Metric Imperial Hardness, Rockwell C (air cooled from 982°C, 45 mins) 52.5 52.5 Hardness, Rockwell C (air cooled from °C, 45 mins) 56 56 Hardness, Rockwell C (air cooled from °C, 45 mins) 57 57 Modulus of elasticity 207 GPa ksi Modulus of elasticity (@538°C/°F) 159 GPa ksi Modulus of elasticity (@204°C/400°F) 190 GPa ksi Charpy impact (V-notch; air cooled from °C;535°C temper temperature) 13.6 J 10.0 ft-lb Charpy impact (V-notch; air cooled from °C;650°C temper temperature) 27.1 J 20.0 ft-lb Charpy impact (V-notch; air cooled from °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 0.27-0.30Thermal 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.°F5. Forging of H11 Tool Steels
AISI H11 alloy steels are forged at °C (°F). For this type of steels, forging below 899°C (°F) is not preferable.
6.AISI H11 Tool Steel Heat Treatment
Annealing of H-11 steel
Anneal at 871°C and slow cool at 4.4°C per hour or less in the furnace.
Tempering of Steel H11
Temper at 537°C to 648°C for Rockwell C hardness of 54 to 38. Double tempering for one hour each time at the selected tempering temperature is recommended.
7.Applications of AISI H11 Tool Steel
H11 alloy steel is often used for highly stressed structural parts such as aircraft landing gear.
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Some typical applications: Hot punches, die casting dies, forging dies, hot shear blades, hot gripper dies, and extrusion tooling.
The tools produced from H11 chromium hot-work steels can be cooled using water without damage as these steels have low carbon and alloy contents.
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Steel Tool H11 / DIN / AISI H11. Annealing, hardening, air and oil quenching, and single- or double-tempering are the most common heat treatments, which are performed at temperatures of 840° F (450° C), 930° F (500° C), ° F (550° C), ° F (600° C), and ° F (650° C). Combining hardness, toughness, yield strength, ultimate strength, and ductility results in the best heat treatment, which also includes oil-quenching and double-tempering at ° F (550° C).
The austenitizing temperature, which should be between ° and °F, the quenching medium, and the tempering parameters all have a role in how hard H11 / DIN / AISI H11 steel becomes. H11 / DIN / AISI H11 steel should be hardened by cooling in still air due to its extremely high hardenability.
Quenching H11 steel is tempered to make it more resilient and less brittle. Reheating the steel to a temperature that is lower than its critical temperature&#;typically between 500°C and 650°C or 932°F and °F&#;and maintaining it there for a certain amount of time is the process of tempering. The ideal balance between hardness and toughness determines the precise tempering temperature and duration. These steels can also undergo double tempering once per hour at the chosen tempering temperature.
Forging H11 / DIN / AISI H11 steel is normally done at a temperature between and degrees Celsius ( and degrees Fahrenheit). According to the required deformation properties and the manufacturer's instructions, the precise temperature will vary.
H11 / DIN / AISI H11 steel is heated to a particular temperature of 650 °C for two hours as part of the stress-relieving procedure, and it is then gradually cooled.
H11 / DIN / AISI H11 Steel should not be normalised due to its air-hardening ability .
H11 / DIN / AISI H11 tool steels are annealed at 871°C (°F) and then slowly cooled at 4°C (40°F) in the furnace.
H11 / DIN / AISI H11 steel can be nitride to give a hard surface at a temperature of 500 °C to 600 °C
The surfaces of the dies attain temperatures of 700&#;800 °C during forging procedures. As a result, hardfacing these sections using nonferrous higher temperature hardfacing alloys like Stellite 6 can frequently increase the effectiveness and lifespan of the dies. The most crucial characteristics of Stellite 6 are its high hardness, galling resistance, hot corrosion and oxidation resistance, adhesive wear resistance, low friction coefficient, and lack of allotropic transformation up to oC. Due to its high alloy concentration and resulting hardenability, this steel is extremely susceptible to hydrogen induced cracking (HIC) and high cooling rates used during welding cycles. Due to this, the hardfacing characteristics of H11 tool steel with Stellite 6 in the TIG welding process have been examined in this study. The findings show that it is not possible to hardface this steel in its annealed hardfaced state; instead, preheating and intermediate temperatures between 310 and 370 oC are advised. Under these circumstances, 3mm was found to be the minimum thickness required to provide the hardness required (41-42 HRC) in the hardfacing layer.
After the soaking period, the H11 / DIN / AISI H11 steel is rapidly cooled by immersing it in a quenching medium. The choice of quenching medium depends on factors such as the steel's composition and the desired hardness. Oil, water, and air are commonly used quenching media. Oil quenching provides a moderate cooling rate, water quenching provides a faster cooling rate, and air quenching provides the slowest cooling rate.
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