Crucible CPM® Nu-Die® EZ

CRUCIBLE CPM Nu-Die EZ is a new, patented die and mold steel designed for service as die casting dies and plastic injection molds. It is supplied in the prehardened condition, and is easily machined using conventional chip-making methods.     This unique die and mold steel provides:         Freedom from Distortion in Heat Treament         Freedom from Worry over Heat Treatment Quality         Freedom from EDM Damage     CPM Nu-Die EZ is based upon the chemical composition of AISI H13 hot work steel to which sulfur has been added to provide machinability in the prehardened condition. It is manufactured by the Crucible Particle Metallurgy (CPM) Process which permits the addition of sulfur without detrimental effects on tool performance. Unlike the sulfides which form in conventionally-produced, resulfurized H13, the sulfides in this steel are small and uniformly distributed.

Typical Chemistry Carbon 0.36% Manganese 0.35% Silicon 1.00% Chromium 5.50% Molybdenum 1.60% Vanadium 0.85% Sulfur 0.17 %

CONVENTIONAL                CPM Nu-Die EZ Resulfurized H13

Heat Treatment CPM Nu-Die EZ is supplied fully hardened at 43-48 HRC. You can be assured that every tool built with CPM Nu-Die EZ will contain an optimally heat-treated, homogeneous microstructure. No additional heat treatment should be performed except for stress relieving, which is described below. Tool Building Tools can be machined to finish dimensions in a single machining operation because no additional heat treatment is required to harden the tools. Therefore, the unpredictable dimensional changes which typically occur when H13 tools are rough machined and hardened by heat treatment are totally avoided. This results in significant cost and time savings in the tool building operation. CPM Nu-Die EZ offers the opportunity to eliminate or minimize the use of EDM. If you must EDM, the resulting hardened white layer must be removed or tempered at 1000°F (540°C) for two hours. Stress Relieving For intricately-shaped tools and for inserts with deep cavities, the tools should be stress relieved after machining by heating uniformly to 1000°F (540°). Hold at temperature for 1/2 hour per inch (25.4mm) of maximum thickness, 2 hours minimum, and cool in still air to ambient temperature. Thermal Fatigue Resistance The thermal fatigue resistance of CPM Nu-Die EZ when evaluated in laboratory tests has been shown to be equal to or better than Premium Quality H13. Impact Toughness Typical transverse Charpy V-notch impact toughness values for CPM Nu-Die EZ, conventional resulfurized H13, and Premium Quality H13 (NADCA 207-90) are shown below.

Grade HRC Impact Toughness ft-lb CPM NuDie EZ 45 9 Conventional Resulfurized H13 45 2 Premium Quality H13 46 10

Weld Repair CPM Nu-Die Ez can be successfully welded using the same techniques and filler metals that are used to weld typical H13 tooling. Physical Properties Modulus of Elasticity ..................................................................30 psi x 106 Density ...........................................................................................0.280 lb/in3 Thermal Conductivity ................................... 200F..............5 BTU/hr/ft/°F                                         .....................................600F..............16 BTU/hr/ft/°F Thermal Expansion                            RT-200F......................................................6.1 x 10-6 in/in/°F                            RT-400F......................................................6.4 x 10-6 in/in/°F                            RT-800F......................................................6.8 x 10-6 in/in/°F                            RT-1000F....................................................7.0 x 10-6 in/in/°F                            RT-1200F....................................................7.3 x 10-6 in/in/°F

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