CRUCIBLE S7 XL Premium Grade S7 |
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Crucible S7 XL is a double refined, high purity version of AISI S7, designed specifically for ease of wire EDM operation, superior shock resistance compared to conventional S7, and improved polishability and texturing consistency in plastic injection molds. |
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Surface Treatments Because of the low tempering temperatures normally used, S7 XL is not typically suitable for nitriding or similar treatments. Annealing A. Heat to 1550F, hold two hours, slow cool (50F/hour maximum) to 1000F, then air cool to room temperature. Or B. Heat to 1550F, hold two hours, cool to 1400F, hold 4 hours, then air cool to room temperature. Typical annealed hardness: 187/220 BHN Stress Relieving Annealed Material: Heat to 1200/1250F, hold two hours, cool in still air. Hardened Material: Heat to 25/50F below tempering temperature, hold two hours, cool in still air. Welding Use hot work tool steel filler material 4140 or 4150 type filler material may be satisfactory for small repairs or welds away from working surface of tool. Annealed Material: Preheat to 400/600F. Maintain above 400F during welding. Reanneal or temper 1400F for four hours after welding. Hardened Material: Preheat to original tempering temperature, (300F minimum). Maintain above 300F during welding. Cool to 150F. Temper at 25/50F below original tempering temperature (300F minimum). Physical Properties Modulus of Elasticity ...30 psi x 106 Density ...0.283 lb/in3 Thermal Conductivity ...200F...16.5 BTU/hr/ft/°F Thermal Expansion |
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