TOOL STEEL FOR FORMING ROLLS Russian patent published in 2005 - IPC

FIELD: metallurgy, in particular heat resistant steel composition for forming rolls in metal hot-rolling mill.

SUBSTANCE: claimed steel contains (mass %): carbon 0.21-0.40; silicium 0.60-1.50; manganese 0.20-0.60; chromium 4.00-6.00; nickel 0.20-2.00; vanadium 0.30-0.60; titanium 0.01-0.50; tellurium 0.001-0.020; aluminum 0.01-0.50; molybdenum or molybdenum and tungsten in total 1.00-2.00; and balance: iron. Molybdenum content in steel is not less than 0.40 mass %, and one mass part of molybdenum is equivalent to two mass parts of tungsten. Steel may additionally contain (mass %) calcium up to 0.30; zirconium up to 0.35; cerium up to 0.35, and boron up to 0.015. Content of inevitable impurities in claimed steel is limited: e.g. (mass %) sulfur, phosphorous and copper each not more than 0.040; lead, arsenic, and antimony each not more than 0.010.

EFFECT: decreased crack and erosion net forming on roll surface.

3 cl