Din 2343 | Din 1.2343 Hot Work Tool Steel - Virat Special Steels

Heat Treatment & Processes:

Heat Treatment:

The H11 / DIN / AISI H11 steel undergoes various heat treatment procedures including annealing, hardening, air and oil quenching, as well as single- or double-tempering. The temperatures utilized generally range from 840°F (450°C) to 930°F (500°C), 1,022°F (550°C), 1,112°F (600°C), and up to 1,202°F (650°C). The optimal heat treatment effectively balances hardness, toughness, yield strength, ultimate strength, and ductility, which is particularly achieved through oil-quenching and double-tempering typically conducted at 1,022°F (550°C).

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Hardening:

The temperature for austenitizing must be maintained between specific values, as well as the quenching medium and the tempering parameters, which all contribute to the hardness of H11 / DIN / AISI H11 steel. Due to its extremely high hardenability, H11 / DIN / AISI H11 steel is typically hardened by cooling in still air.

 

Tempering:

Tempering is performed on the quenched H11 steel to enhance its resilience and decrease brittleness. This entails reheating the steel to a temperature below its critical point, generally between 500°C and 650°C (932°F and 1,202°F), and maintaining this temperature for a specified duration. The ideal tempering temperature and time will yield an optimal balance of hardness and toughness. Additionally, double tempering can be carried out once per hour at the desired tempering temperature.

 

Forging:

The forging process of H11 / DIN / AISI H11 steel is typically performed at temperatures ranging from 850°C to 1,200°C (1,562°F to 2,192°F). The exact temperature depends on the specific deformation properties required by the fabrication process and the manufacturer’s recommendations.

 

Stress Relieving:

To relieve stress, H11 / DIN / AISI H11 steel is heated to a specific temperature of 650°C for two hours and then gradually cooled.

 

Normalizing:

Due to its air-hardening characteristics, normalizing the H11 / DIN / AISI H11 steel is generally not practiced.

 

Annealing:

The annealing of H11 / DIN / AISI H11 tool steels occurs at 871°C (1,600°F) with a slow cooling rate of 4°C (40°F) in a furnace.

 

Nitriding:

Nitriding of H11 / DIN / AISI H11 steel can be conducted to produce a hard surface, typically at temperatures between 500°C to 600°C.

 

Welding:

During forging processes, die surfaces reach temperatures of 700°C to 800°C. Consequently, hardfacing these areas with non-ferrous high-temperature hardfacing alloys, such as Stellite 6, can significantly enhance the efficiency and lifespan of the dies. Stellite 6 offers remarkable characteristics including high hardness, galling resistance, and resistance to hot corrosion and oxidation. Moreover, due to its high alloy concentration, this steel is particularly susceptible to hydrogen induced cracking (HIC) and high cooling rates prominent in welding processes. The hardfacing of H11 tool steel with Stellite 6 in TIG welding has been extensively studied, revealing that it cannot be hardfaced in its annealed condition; preheating is essential with intermediate temperatures between 310°C and 370°C. Under these conditions, a minimum thickness of 3mm has been identified as necessary to meet the required hardness (41-42 HRC) in the hardfacing layer.

 

Quenching:

Following the soaking period, H11 / DIN / AISI H11 steel undergoes rapid cooling by immersion in an appropriate quenching medium. The selection of quenching medium depends on the composition of the steel and the targeted hardness. Common media for quenching include oil, water, and air, each offering different cooling rates—oil provides moderate cooling, water induces a faster rate, and air subjects the steel to the slowest cooling speed.

 

H-11 (1.) refers to a 5% chromium hot work tool steel. In comparison to H13, H11 steel possesses less vanadium, resulting in improved toughness albeit with a slight reduction in wear and tamper resistance. H11 steel exhibits remarkable dimensional stability throughout heat treatment.

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H-11 & H-11M Similar/Equivalent Steel Grades :

CHINA BRAZIL AUSTRIA GERMANY TG VILLARES BOHLER DEW GRODITZ H 11 TENAX 300 W300 1. 1. VICTORY

SLOVANIA JAPAN TAIWAN CHEZ. REP RAVNE SANYO GLORIA POLDI UTOP M01-EFS QDA61 GMH11 TLH EFS

Steel Properties : Exhibits high hot tensile strength and toughness. Capable of limited water cooling, showing good resistance to thermal and hot cracking.

Applications : Utilized as a hot-work tool steel for diverse applications including pressure casting dies, metal extrusion tools for light metal processing, forging dies, molds, plastic processing barrels, and hot-shear blades.

Chemical Composition: (%)

Production Process :

Round Bar :

Flat Bar :

UT Standard : Reduction Ratio : Delivery Status : SEP , (DEC.84)E/e As 1:4 or 1:5 in annealed condition.

Sizes of Round Bars :

Cold Drawn/Ground Bar Hot Rolled Annealed & Peeled Bar Forged + Annealed + Turned Bar Φ 2.0 - 14.4mm Φ 14.5 - 80.0mm Φ 81.0 - 810.0mm

Sizes of Hot Rolled Flat Bars / Sand Blasted & Machined Straight :

Thickness Width 5mm - 410mm 10mm - 810mm

HEAT TREATMENT CONDITION :
Quenching temperature : -'
Cooling Medium : air-cooling
Tempering temperature : 550-650'
Tempering times : 2 Times, with the second tempering temperature lower than in the first time
Tempering Hardness : 47-48 HRC.

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Tempering°C 500°C 550°C 600°C HRC HRC56 HRC54 HRC50