Tool Steel H11 has minimal distortion during deep-hardening and air-hardening thanks to the balanced alloy content. H11 can also be hardened with an air quenching method.

Tool Steel H11, equivalent to 882, is a 5% chromium hot work tool steel designed particularly for applications requiring extreme toughness combined with good red hardness. It provides an extra margin of safest in tools subject to heavy hammer blows, and those tools containing deep recesses or sharp corners.

Tool Steel H11 are forged at 900- 1120°C .Reheat is necessary when temperature below 900°C ,AISI H11 steel should be cooled as slowly as possible in the furnace,annealing is recommended after forged. Stress relieving to remove machining stresses should be carried out by heat to 650°C, holding for one hour at heat, cooling in the furnace.

Tool Steel H11 Equivalent Grade : AISI H11,SAE H11, H11, 4Cr5MoSiV, DIN 1.2343, JIS SKD6 ,DAIDO SKD6 BOHLER W300

Die Umformeigenschaften von H-11 H11 AMS 6487 Werkzeugstahl sind im Vergleich zu herkömmlichen Methoden gut. Es kann auch durch Schmieden und Bearbeiten geformt werden. Schweißen H-11 AMS 6487 Werkzeugstahl ist eine mit herkömmlichen Methoden leicht handhabbare Legierung.

WORK TOOL STEEL GRADE H11, a member of the hot - work tool steel family, has carved a niche for itself in various industrial applications due to its exceptional properties.

1. Chemical Composition

Tool Steel H11 is characterized by a balanced chemical composition. It contains a moderate amount of carbon, typically around 0.33 - 0.43%. Carbon is crucial as it contributes to the steel's hardness and strength. By carefully controlling the carbon content, H11 can achieve a good balance between wear resistance and toughness.

Chromium (Cr) is present in H11 at approximately 4.75 - 5.50%. Chromium significantly enhances the steel's hardenability, corrosion resistance, and high - temperature strength. It forms carbide compounds during heat treatment, which play a vital role in strengthening the microstructure of the steel.

Molybdenum (Mo) is another key alloying element in H11, with a content of about 1.10 - 1.75%. Molybdenum improves the steel's hardenability, creep resistance, and resistance to temper softening. It also helps in reducing the critical cooling rate during quenching, which is beneficial for preventing cracking and distortion.

Vanadium (V) is added in small amounts, around 0.30 - 0.60%. Vanadium forms fine carbide particles that are extremely hard and stable. These carbides enhance the wear resistance and toughness of H11, and also contribute to its ability to maintain its hardness at elevated temperatures.

2. Mechanical Properties

Tool Steel H11 exhibits excellent mechanical properties that make it suitable for demanding applications. Its hardness, after proper heat treatment, can reach a Rockwell C scale (HRC) value of around 50 - 55. This high hardness enables the steel to resist wear and deformation during service, ensuring a long - lasting performance in applications such as die - casting dies and forging tools.

The toughness of H11 is also remarkable. It can withstand significant impact forces without fracturing, which is crucial in applications where the tool is subjected to repeated shock loads. This combination of hardness and toughness is achieved through the careful control of the alloying elements and the heat treatment process.

In terms of fatigue strength, H11 shows good resistance to cyclic loading. This property is essential for tools that are used in high - cycle operations, as it helps to prevent premature failure due to fatigue cracks.

3. Heat Treatment

Heat treatment is a critical process for H11 to achieve its optimal properties. The typical heat treatment process for H11 includes annealing, quenching, and tempering.

Annealing is carried out at around 845 - 870°C followed by slow cooling. This process softens the steel, relieves internal stresses, and improves machinability. It also refines the grain structure, preparing the steel for subsequent heat treatment operations.

Quenching is usually performed at a high temperature, around 1010 - 1050°C, followed by rapid cooling, often in oil or a suitable quenching medium. This high - temperature quenching step is necessary to achieve the desired hardness and strength by transforming the microstructure into a martensitic phase.

Tempering is then carried out at temperatures between 550 - 650°C. Tempering helps to relieve the internal stresses induced during quenching, improves the toughness of the steel, and fine - tunes the hardness to the desired level. Multiple tempering cycles may be employed to further optimize the properties of H11.

4. Applications

Due to its outstanding properties, H11 finds wide applications in the manufacturing industry. In the die - casting industry, Werkzeugstahl H11 is commonly used to make dies for casting non - ferrous metals such as aluminum and magnesium. The high - temperature strength and wear resistance of H11 enable the dies to withstand the harsh conditions of the die - casting process, including high pressures and repeated contact with molten metal.

In the forging industry, H11 is used to manufacture forging dies. These dies need to have high strength, toughness, and wear resistance to shape hot - worked metals into the desired forms. H11's ability to maintain its properties at elevated temperatures makes it an ideal choice for this application.

It is also used in the production of extrusion dies, where the steel must resist the high forces and temperatures associated with pushing metal through a die to form various shapes. Additionally, H11 can be found in some plastic injection molds, especially those used for high - temperature plastics or in applications where long - term wear resistance is required.

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