DIN 1.2738 Pre-Hardened Tool Steel in Gurugram – Strength with Dimensional Stability
Introduction: What is DIN 1.2738?
DIN 1.2738 (additionally referred to as 40CrMnNiMo8-6-four) is a pre-hardened nickel-chromium-molybdenum alloyed device steel specially designed for massive plastic injection molds and die-casting dies
Unlike popular P20 metal, the addition of Nickel (Ni) in 1.2738 presents advanced hardenability, taking into consideration consistent hardness throughout thick sections (up to 500mm / 20 inches). It is furnished in the pre-hardened circumstance (commonly 280–325 HBW), doing away with the need for additional heat treatment after machining, which reduces manufacturing time and gets rid of the hazard of distortion.
Key Properties & Advantages
- High Hardenability:Excellent through-hardening properties due to Nickel content.
- Excellent Polishability:Achieves a high-gloss finish (mirror finish), essential for optical lenses and cosmetic parts.
- Good Machinability:Despite being pre-hardened, it offers stable cutting properties.
- Texture Stability:Suitable for chemical texturing (e.g., Mold-Tech) without losing detail.
- Weldability:Good weld repair capabilities (preheating required).
- Corrosion Resistance:Moderate resistance to corrosion compared to stainless grades but sufficient for standard engineering plastics.
Chemical Composition (%)
Understanding the chemistry allows engineers confirm fabric requirements. Include a table for featured snippets:
Element Content (%)
Carbon (C) 0.35 – zero.45
Silicon (Si) zero.20 – 0.40
Manganese (Mn) 1.30 – 1.60
Phosphorus (P) Max 0.Half
Sulfur (S) Max 0.Half
Chromium (Cr) 1.Eighty – 2.10
Molybdenum (Mo) 0.15 – 0.25
Nickel (Ni) 0.90 – 1.20
Mechanical Properties (Pre-Hardened Condition)
Property Value
Hardness 280 – 325 HBW (approx. 29–34 HRC)
Tensile Strength (Rm) 950 – 1,100 MPa
Yield Strength (Rp0.2) 750 – 850 MPa
Modulus of Elasticity 205,000 MPa (29,700 ksi)
Equivalent Grades (International Standards)
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Standard Grade Name
DIN (Germany) 1.2738 / 40CrMnNiMo8-6-four
AISI/SAE (USA) P20 Ni (Modified P20)
JIS (Japan) SKT5 / PDS5
BS (UK) 708M40 (comparable, but 1.2738 is standard)
GB (China) 3Cr2NiMo
1. Welding
• Preheating: 250°C – three hundred°C (480°F – 570°F)
• Filler Metal: Use matching composition (1.2738 or P20 Ni unique rods).
• Post-Weld: Slow cooling followed by using strain relieving at 450°C – 550°C.
2. Nitriding (Surface Hardening)
For improved put on resistance and corrosion protection, nitriding can be carried out without affecting the core hardness notably.
• Gas Nitriding: 490°C – 530°C yields a case depth of zero.2 – zero.5 mm with floor hardness up to 700–800 HV.
Three. Re-Heat Treatment (If required)
• Soft Annealing: seven-hundred°C – 750°C, sluggish cooling.
• Hardening: 840°C – 880°C, observed through oil or air quenching.
• Tempering: 540°C – 680°C relying on the preferred final hardness.
Comparison: DIN 1.2738 vs. DIN 1.2311 (P20)
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Feature DIN 1.2738 (P20 Ni) DIN 1.2311 (Standard P20)
Nickel Content ~1.Zero% None
Hardenability Excellent (up to 500mm thickness) Moderate (as much as 150mm thickness)
Polishability Excellent (Mirror finish) Good
Typical Use Large molds, automotive, optics Small to medium molds, wellknown reason
Cost Higher Standard
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