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Chromium hot-work tool steels are designated as group H steels according to the AISI classification system. This series of steels start from H1 to H19. The most commonly used chromium hot-work steels are H11, H12, and H13, which can be air-hardened in 150 mm thick sections. The steels are subjected to minimal distortion during hardening due to their balanced alloy content. The tools produced from chromium hot-work steels can be cooled using water without damage as these steels have low carbon and alloy contents.
H11 alloy steel is often used for highly stressed structural parts such as aircraft landing gear. 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. We are reliable supplier of AISI H11 tool steel and we offer and delivery satisfactory quality of H-11 tool steel. Contact us for best offer of AISI H11 steel materials.
|Standard||ASTM A681||DIN EN ISO 4957||JIS G4404||BS 4659|
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, OHNS, D2, D3, H-13, CW-1, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.
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The following table shows the chemical composition of H-11 steel:
The mechanical properties of H11 tool steels are tabulated below.
|Tensile Strength||260 ksi||1792 MPa|
|Tensile Strength, Yield (0.2% Offset)||215 ksi||1482 MPa|
Heat slowly to the hardening temperature of 800-820°C. Maintain until thoroughly soaked through. Plenty of time must be given for this soaking and then quench in oil.
According to some independent studies, the optimum heat treatment for a combination of hardness, toughness, yield strength, ultimate strength, and ductility include oil-quenching and double-tempering at 1020° F (550° C). Higher hardness can be achieved by oil-quenching and double tempering at 1110° F (600° C), but this can also lead to lower lead strength and very low ductility. Also, with the increase of hardness of Tool Steel H11, impact toughness decreases.
H11 steel having very high hardenability and should be hardened by cooling in still air. The use of a salt bath or controlled atmosphere furnace is desirable to minimize decarburization, and if not available, pack hardening in spent pitch coke is suggested. The temperature employed is usually 1800°-1850°F, depending on size section.
Tempering is carried out on H11 tool steels at temperature ranging from 538 to 649°C (1000 to 1200°F) to obtain Rockwell C hardness of 54 to 38. Double tempering can also be performed in these steels every one hour at the preferred tempering temperature.
The physical properties of H11 tool steels are given in the following table.
|Density||7.81 g/cm3||0.282 lb/in3|
The following table shows the thermal properties of H11 tool steels.
|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 steels are forged at 1121°C (2050°F). For this type of steels, forging below 899°C (1650°F) is not preferable.
Stress relieving after rough machining, stress in the tool can be released by heating at 650°C during 2 hours followed by air cooling.
Do Not Normalize.
H11 tool steels are annealed at 871°C (1600°F) and slowly cooled at 4°C (40°F) in the furnace.
|Density||7.81 g/cm3||0.282 lb/in3|
The machinability rate of H11 tool steels is nearly 75% of that of the W group tool steels.
Thermal fatigue (heat checking), mechanical fatigue, wear and plastic deformation of critical areas of hot forging dies at working temperatures are the main mechanisms that reduce their lifetime. During forging processes the surfaces of the dies reach temperatures of 700-800 ºC. Therefore, hardfacing of these areas with nonferrous elevated temperature hardfacing alloys such as Stellite 6 can improve the performance and lifetime of the dies, many times. Hot hardness, galling resistance, hot corrosion and oxidation resistance, adhesive wear resistance, low friction coefficient and absence of allotropic transformation up to 1100 ºC are the most important properties of Stellite 6. H11 tool steel is widely used as hot forging die material. This steel because of its high alloy contents and, therefore, its hardenability is very sensitive to high cooling rates involved during welding cycles and hydrogen induced cracking (HIC). For this reason, in this research hardfacing parameters of H11 tool steel with Stellite 6 in TIG welding method have been investigated. According to the results, hardfacing of this steel in annealed hardfaced condition isn’t feasible and it is recommended that preheating and intermediate temperatures during the hardfacing cycle between 310-370 ºC. The suitable current for TIG hardfacing of this steel by φ3.2mm filler rod was determined to be 80-85 amperes for the first layer and 90-100 amperes for upper layers. The minimum thickness for obtaining maximum hardness in the hardfacing layer (41-42 HRC) under these conditions was determined to be 3mm. It is recommended that the effective heat input for hardfacing of this steel under three-body heat transfer conditions would be less than 455kJ/m. It is also recommended that the Δt8→5 of H11 tool steel hardfacing cycle would be in the range 6 to 15.3s. Finally it is recommended that H11 hardfaced tool steel would be stress relived in the range 425 -500 ºC for 1 hour per 30mm base metal thickness.
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