DIN 1.3343 High Speed Steel | M2 Tool Steel

As one of the most widely used high-performance tool steels in the industrial field, DIN 1.3343 is a typical tungsten-molybdenum high-speed steel, corresponding internationally to AISI M2 and JIS SKH51.

1.3343 steel, with its balanced comprehensive properties (excellent red hardness, wear resistance, and toughness), has become an indispensable key material in modern manufacturing. From precision cutting tools to complex molds, it exhibits outstanding stability under extreme conditions such as high temperature and high pressure, making it an “all-rounder” in the tool steel field. Through reasonable heat treatment and surface treatment, its performance can be further improved to meet the needs of high-end manufacturing.

DIN1.3343 high speed flat steel

1.Chemical Composition

GradeCSiMnPSCrMoVW
1.3343/S6-5-20.86-0.94≤0.45≤0.4≤0.03≤0.033.8-4.54.7-5.21.7-2.26.0-6.7

DIN 1.3343 Steel Related Standard & Equivalent Grade

GB/T 9943:W6Mo5Cr4V2

ASTM A600:M2

JIS G4403:SKH51

DIN 1.3343 High-Speed ​​Steel Core Characteristics

  • Excellent Red Hardness
    -Maintains a hardness of HRC 60 or higher even at 600°C
    -Ensuring the cutting edge does not soften during high-speed cutting, maintaining stable cutting performance
  • Excellent mechanical properties

    Hardness: 64-66 HRC after quenching and tempering

    Bending strength: Approximately 3000-3500 MPa

    Impact toughness: 25-35 J/cm², capable of withstanding intermittent impact loads

    Elastic modulus: Approximately 190-210 GPa

    Yield strength: ≥3250 MPa

  • Microstructural Advantages
    -Fine and uniform distribution of carbides improves the balance between toughness and wear resistance
    -High vanadium content (1.7-2.1%) forms high-hardness carbides, significantly improving wear resistance

DIN 1.3343 Heat Treatment Process

1.Annealing

  • Temperature: 840-860℃, hold at this temperature, then furnace cool to 500℃, followed by air cooling.
  • Purpose: To reduce hardness to ≤269 HB, facilitating machining.

2.Quenching (Critical Step)

  • Preheating: 800-850℃ (two-stage preheating to prevent cracking)
  • Austenitizing: 1210-1230℃ (salt bath or vacuum furnace)
  • Cooling: Oil quenching or staged quenching (550℃ salt bath followed by air cooling)

3.Tempering

  • Temperature: 540-560℃, 2-3 times, 1-2 hours each time.
  • Effect: Eliminates residual austenite, improves toughness and dimensional stability.

Comparison: DIN 1.3343 vs other high-speed steels

Characteristics1.3343(M2)M35 (Cobalt-containing)T1 (Tungsten-based)
ToughnessExcellent (Balanced)Good (High Hardness)Average
Wear ResistanceExcellent (High Vanadium)ExcellentGood
Red HardnessGood (600℃/HRC60+)Excellent (620℃/HRC62+)Good
ProcessabilityExcellent (Good Thermoplasticity)AverageAverage
CostMediumHigh (Cobalt-containing)High (High Tungsten)

Advantages: 1.3343 achieves the best balance between toughness, wear resistance, and red hardness, making it the benchmark for general-purpose high-speed steels.

DIN 1.3343 Application Areas

  • Metal Cutting Tools: Drills, milling cutters, turning tools, reamers, etc. Particularly suitable for machining difficult-to-cut materials such as stainless steel and high-temperature alloys.
  • Cold Work Dies: Cold forging dies, cold heading dies, stamping dies. Maintain high precision and long service life under high pressure.
  • Precision Tools and Parts: Gear cutting tools, taps, dies. Precision bearing components, woodworking tools.

DIN 1.3343 STEEL SUPPLY FORM & SIZE 

Round bar:Φ4-Φ300mm

Flat bar:Thickness :12-200mm ,Width:200-610mm

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