P20 High Hard / 1.2378

Overview

1.2378 is a high-alloyed chromium-vanadium-molybdenum cold-work tool steel offering very high wear resistance and high cutting performance. SIHARD 2378, for example, is designated 1.2378 / X220CrVMo12-2 and is used for demanding cold-work applications.

Chemical Compostion

C

Si

Mn

Cr

Mo

V

Ni

P/S

0.35 – 0.40

0.20 – 0.40

1.40 – 1.60

1.80 – 2.10

0.15 – 0.25

2.00 – 2.30

0.90 – 1.20

< 0.035

Heat Treatment

  • Soft annealing: approximately 820–850°C
  • Stress relieving: approximately 650°C
  • Hardening: approximately 1070–1100°C
  • Air or warm-bath quenching
  • Tempering according to required hardness

SIHARD 2378 data gives approximately 63–64 HRC after quenching.

Mechanical Properties

  • Hardened hardness: approximately 60–64 HRC
  • Very high wear resistance
  • High cutting performance
  • High compressive strength
  • Good dimensional stability

Equivalent Grades

  • DIN: 1.2378
  • DIN: X220CrVMo12-2
  • AISI: D7* / equivalent group rather than a strict one-to-one equivalence
  • Proprietary equivalents include OCR12V2 / SIHARD 2378

Applications

  • Cutting tools
  • Punches and dies
  • Fine blanking
  • Sheet-metal tooling
  • Slitting and cutting tools
  • Plastic-processing tools
  • Wear-resistant components
  • Transformer/dynamo sheet processing tools

Available Forms

  • Round bars
  • Flats
  • Plates
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