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• The 5% chromium content makes this steel especially desirable for punches and dies to be used in long production runs since it gives the tools far longer life. Up to 50% more pieces per sharpening can be produced than with oil hardening steel.
• High wear resistance is also ideal for punches and dies to stamp silicon, stainless steels, monel metal and other types of abrasive material
• Maintains close dimensional accuracy throughout the heat treating process. The wide 75º hardening range make this virtually foolproof.
• Full-length identification eliminates confusion with other steels
• Starrett uses its own ground flat stock for many of its precision tool parts
Furnished in 18" and 36" lengths, ground straight and parallel. HARDENING
497 and 499 Air Hardening Ground Flat Stock have a wide hardening range of 1700ºF to 1775ºF, with 1750ºF recommended for most work. For heavier sections use the high side of the range. Heat uniformly throughout but do not soak longer than necessary. Cool in still air. No pre-heat is required if pack or atmosphere controlled furnace methods are used, but with the open furnace method a pre-heat of 1450ºF is recommended.
A tempering time of two hours at temperature is recommended. Use chart for selecting the desired Rockwell C hardness and corresponding tempering temperature. For maximum toughness, double temper for two hours at each temperature recommended. The following may also be used as a guide, depending on the type of work.
LIGHT BLANKING PUNCHES AND DIES 400º-425º F HEAVY BLANKING PUNCHES AND DIES 700º F ANNEALING
1525º-1575º F. Furnace cool at no more than 50º per hour to 800º for maximum softness.
499, 1-1/4" and over is Blanchard ground with saw cut edges