As the designation itself implies, DB 6 is a Die Block Steel conforming presumably to AISI L6 (U.S.) , SKT4 ( Japan ) and similar to DIN 1.2714 (Europe). Containing Nickel (1.4 to 1.6%); Chromium (0.8 to 1.1%); Molybdenum (0.35 to 0.50%); and traces of Vanadium; it is a borderline high-Carbon steel since its Carbon content is between 0.55 and 0.60 and being higher than that of steels of the DIN 1.2714 class, it is harder without an increase in brittleness. Its Nickel content gives it great impact resistance, while its Chromium content provides both, toughness and corrosion resistance, so wear is minimal. It is also resistant to thermal shock and thermal fatigue cracking. Molybdenum contributes to high temperature tensile strength. In austenitic Chromium-Nickel steels it inhibits pitting and crevice corrosion, even when Chloride and Sulphur levels are high.
VIRAT SPECIAL STEELS, INDIA supplying a versatile steel DB6 MOULD STEEL that may be used for both hot and cold work, and can be forged into dies of all kinds. Being relatively expensive at around $ 1,800 a tone, in comparison to steels suitable for work at lower temperatures, it is mainly used for “hot work”.
The ability to withstand repeated heating and cooling cycles is a must for any die material for heat distortion creates huge mechanical stress in addition to the thermal stress imposed by repeated heating-cooling cycles. Further, hot-work die steel SKT4 ( DB6) TOOL STEEL should not only have high hardness, but should retain much of that hardness at high temperatures too; besides exhibiting qualities such as abrasion resistance, strength at high temperatures, thermal fatigue stability, thermal conductivity and low thermal coefficient of expansion even to high temperatures.
DB 6 DIE BLOCKS possesses all of these and so it has become an almost universal steel for forging dies such as press dies, extrusion dies, trim dies, as well as dies for Drop Forging Hammers and Mechanical Presses, Die Molds, Shoe Blocks, Die Holder, Cassettes, Piston Rods, Cranks, Boaster, Shearing Blades, Tools, Plastic Molds and Shafts.
VIRAT SPECIAL STEELS, INDIA generally supplying DIN 2714 (AISI L6) in pre-toughened condition; commonly through quenching and tempering to a force of 1300 N/mm². In special cases it may be supplied after annealing. The working hardness is between 370 to 410 HB for rounds or between 355 to 400 HB for squares and flats.