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Hot work tool steels are specialized alloys designed to maintain strength and hardness even at high temperatures, making them suitable for applications like forging dies, hot extrusion dies, and die-casting molds. Here's a more detailed description:

• Key Properties:
  • High Heat Resistance: Hot work tool steels are engineered to resist softening and maintain their hardness and strength when exposed to high temperatures, often exceeding 200°C. 
  • Good Wear Resistance: They exhibit excellent resistance to wear and abrasion, crucial for tools and dies that see repeated use in hot working processes. 
  • Thermal Shock Resistance: These steels are designed to withstand rapid temperature changes, a common occurrence in hot working applications. 
  • Toughness: They often possess a good level of toughness, allowing them to resist cracking and fracture under stress. 
• Common Applications:
  • Forging Dies: Used for forming hot metal parts. 
  • Hot Extrusion Dies: Used in the extrusion of hot metal profiles. 
  • Die-Casting Dies: Used for casting molten metals into molds. 
  • Hot Stamping Dies: Used for forming heated steel sheets. 
  • Other Applications: Hot cutting knives, press extrusion molds, forging presses, molds for the production and processing of metals in solid and liquid form 
• Types of Hot Work Tool Steels:
  • Chromium Hot Work Steels (AISI H10 to H19): These steels contain chromium as a primary alloying element, with some grades also including tungsten, molybdenum, vanadium, and cobalt. 
  • Tungsten Hot Work Steels (AISI H21 to H26): These steels are characterized by their high tungsten content, which contributes to their high-temperature strength and wear resistance. 
• Examples of Hot Work Tool Steel Grades:
  • H11, H12, H13: Commonly used chromium hot-work steels. 
  • H21, H26: Tungsten hot-work steels. 
  • DIN 1.2367 steel (X38CrMoV5-3): Known for its toughness, high-temperature strength, and resistance to heat-checking. 

M2 Grade Introduction:Molybdenum high-speed steels are designated as Group M steels according to the AISI classification system. Over 95% of high-speed steels manufactured in the US are group M steels. Tungsten is present in all types from M1 to M10, except M6, and cobalt is not present in any of these steels. Molybdenum high-speed steels have similar performance when compared to tungsten high-speed steels. However, the initial cost of molybdenum tool steels is lower. Titanium nitride, titanium carbide, and several other coatings can be used in the tools made of this kind of steel through a physical vapor deposition process to improve the performance and life span of the tool. M2 Grade Application:The main use of high-speed steel continues to be in the manufacture of various cutting tools. Typical applications for M2 high-speed steel are twist drills, reamers, broaching tools, taps, milling tools, metal saws. M2 is suitable for cold forming tools such as extrusion rams and dies, also widely used in all kinds of cutting tools, knife, and punches and die applications, plastic molds with elevated wear resistance, and screws. M2 Equivalent grades: