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HOME --> MATRIX HIGH-SPEED STEELS --> DRM3

Daido's Dream Series

DRM3

Hot and Warm Forging Die Steel

High hard and tough high speed tool steel with excellent hardenability

Features

Conventional grade MH88 has been improved to DRM3. High hardness and tough DRM3 with excellent hardenability is suitable for high precision cold working tools.

  1. Applicable with the maximum hardness 66HRC
  2. Fine carbides contribute higher toughness and fatigue strength than those of MH51 equivalent to SKH51 
  3. Greater hardenability results in high performance even in large dies and gas quenching in vacuum furnace. 
  4. Double melting realizes clean and homogeneous steel with less non-metallic inclusions

Applications

  • Cold forging dies and punches
  • Cold work roll, emboss roll
  • Tools quenched by gas in vacuum furnace

Heat treatment

DRM3 Harden 1120C (2048F) Draws (minimum of 2) Maximum toughness 620C (1148F) HRC62
Recommend a minimum 6 barr quench Good toughness & wear 590C (1094F) HRC64
Maximum wear 550C (1022F) HRC66
Re-forging
Temperature
Heat treatment conditions (C) Hardness
Annealing Quenching Tempering Annealed Hardening/Tempering
Requested to inquire 800~880
Slow cooling
1100~1140
OQ, GC, Salt bath
550~620
AC, twice
235HB 62~66HRC
OQ: Oil quenching, GC: Gas quenching in vacuum furnace,  AC: Air cooling

Microstructure (As annealed)
Finely distributed coarse carbides. 

Tempering hardness
Toughness: charpy impact property
Hot hardness
Heat checking resistance
Hardenability
Fatigue Strength
Dimensional changes in heat treatment
Durability of drilling tool

Physical Properties

Nitriding

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6796 Powerline Drive 
Florence, KY 41042 USA 
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