Introduction

DIN 1.2714 is a versatile hot work tool steel known for its excellent toughness, high strength, and good wear resistance. It is a nickel-chromium-molybdenum alloyed steel commonly used for forging dies, hot shearing blades, and tools requiring high resistance to impact and thermal fatigue. The steel exhibits superior hardenability and maintains strength and hardness even under severe working conditions.

Properties of the Grade:

  • Excellent toughness and shock resistance
  • Good hot tensile strength
  • High wear resistance at elevated temperatures
  • Good through-hardening properties
  • High hardenability with uniform mechanical properties
  • Superior resistance to thermal fatigue and heat checking
  • Good machinability and polishability
  • Consistent dimensional stability during heat treatment

Uses/Applications:

  • Forging dies and hammer dies
  • Hot shear blades
  • Press tools
  • Punches for hot working
  • Extrusion dies
  • Mandrels
  • Die holders
  • Forming dies for aluminum and magnesium alloys
  • Plastic molds requiring high strength

Chemical Composition:

Element Content (%)
Carbon (C) 0.50 – 0.55
Chromium (Cr) 0.90 – 1.20
Molybdenum (Mo) 0.30 – 0.50
Nickel (Ni) 1.50 – 1.80
Manganese (Mn) 0.50 – 0.80
Silicon (Si) 0.10 – 0.40
Sulfur (S) ≤ 0.035
Phosphorus (P) ≤ 0.035

Mechanical Properties:

(Typical values after heat treatment)

Property Typical Value
Hardness (Annealed) ~ 229 HB
Hardness (Hardened & Tempered) 44 – 48 HRC
Tensile Strength ~ 1400 – 1700 MPa
Yield Strength ~ 1000 MPa
Elongation ~ 12%
Impact Energy (Charpy V-notch) High

Physical Properties:

Property Typical Value
Density ~ 7.85 g/cm³
Modulus of Elasticity (Elastic Modulus) ~ 210 GPa
Thermal Conductivity (at 20°C) ~ 30 W/m·K
Specific Heat Capacity ~ 460 J/kg·K
Coefficient of Thermal Expansion (20–100°C) ~ 11.5 × 10⁻⁶ /°C

Forging:

Forging Temperature Range: 850°C – 1150°C

Procedure:

  • Heat slowly and uniformly to the forging temperature.
  • Begin forging at 1100°C and do not forge below 850°C.
  • After forging, cool slowly in sand or in the furnace to avoid cracking.

Heat Treatment:

  1. Annealing:
    • Heat to 680°C – 720°C.
    • Hold for a sufficient time (e.g., 2–4 hours).
    • Furnace cool slowly at a rate of 10°C/hour down to 500°C, then air cool.
    • Results in a hardness of about 229 HB.
  2. Hardening:
    • Preheat to 600°C – 650°C.
    • Austenitize at 830°C – 870°C.
    • Oil quench or air cool depending on section size.
  3. Tempering:
    • Temper immediately after hardening.
    • Tempering temperature: 550°C – 650°C.
    • Double tempering is recommended to relieve stresses and optimize toughness.

Dimensional Tolerances:

  • Hot Rolled Bars: Standard tolerances according to EN 10060.
  • Peeled and Centerless Ground Bars: Tolerances as per EN 10278 or h9–h11 classes.
  • Plates and Blocks: Machined within close tolerance limits upon request.

Machinability:

  • Moderate machinability, better than higher carbon steels.
  • Can be machined in annealed conditions for best results.

Corrosion Resistance:

  • Moderate corrosion resistance.
  • Primarily designed for hot work rather than for resistance against corrosive environments.
  • Surface treatments like nitriding can be applied to improve corrosion resistance where necessary.

Weldability:

  • Good weldability with proper precautions.
  • Preheating to 200°C – 300°C is advisable before welding.
  • Post-weld heat treatment (PWHT) is recommended to avoid hardness loss and reduce residual stresses.

Available Form:

DIN 1.2714 is available in:

  • Hot Rolled Round Bars
  • Forged Bars
  • Flat Bars
  • Square Bars
  • Blocks
  • Plates
  • Custom-sized die blocks

Material can be supplied in annealed or pre-hardened conditions based on customer requirements.

Conclusion:

DIN 1.2714 is a premium hot work tool steel offering a unique combination of strength, toughness, and wear resistance, making it ideal for demanding forging and hot working applications. Its consistent performance under high-stress conditions ensures durability and longer service life of tools, thus reducing downtime and maintenance costs. Proper heat treatment and surface finishing can further enhance its operational properties for specific applications.

Related Products :   D2, DB6, DIN 1.2714, DIN 1.2080, DIN 1.2379, DIN 1.2343, DIN 1.2344, EN31, H11, H13, OHNS, HCHCR, M2, P20+S, P20, P20+Ni, K310, Maps