MTD 1 is a 4140 plate steel modified with slightly higher carbon and a vanadium addition. Vanadium improves grain refinement and, coupled with the higher carbon, promotes hardness and wear resistance. Another advantage of this steel is its excellent response to flame hardening. It is widely used in a number of applications including holder blocks. Bethlehem MTD 1 steel in normalized and tempered to 262-321 HB in thicknesses to 3 inches and 241-321 HB over 3 inches to 6-1/2 inches.

MTD 2 is a mold base quality Mn-Cr-Mo plate steel. It is commonly used in holder blocks, clamping plates and support plates. The typical .29% carbon content of this steel permits water quenching and tempering to 262-321 HB up to 12 inches thick.

MTD 3 is a Mn-Cr-Mo-V plate steel used in cavity molds. Its excellent internal quality is made possible by Bethlehem's Fineline� process, an advanced technique for sulfur removal. Reducing the sulfur level to a maximum of .005% through Fineline� Double-O-Five processing results in fewer inclusions; those that remain resist elongation during rolling and tend to remain spherical. This "shape control" contributes to improved mechanical properties and good polishing characteristics. High levels of internal quality can be verified by ultrasonic testing, when specified. Available in thicknesses to 12 inches, Bethlehem MTD 3 quenched and tempered to a hardness range of 262-321 HB.

MTD 4 is a 4150 plate steel for applications such as press brake dies, machinery parts and short-run tools and dies where abrasion is a concern. This steel is normalized and tempered to a hardness of 262-321 HB in thicknesses to 3 inches; in thicknesses over 3 inches to 6-1/2 inches, it is offered at 241-321 HB.

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