SU908919A1 - Martensite steel - Google Patents

Description

The invention relates to metallurgy, in particular, to high-strength, low-alloyed martensitic steels for cast parts of zona loaded parts. Closest to the proposed is martensitic steel 1 containing, wt.%: Carbon 0.1 - 0.5 Manganese 0.3 - 2.0 Chromium 0.5 - 5.0 Molybdenum 0.5-5.0 Vanadium 0.5 - 3 , 0 Silicon 0.1–1.3 Iron Else The disadvantages of a well-known low plasticity and viscosity in the litho state. The purpose of the invention is to increase plasticity and viscosity while maintaining strength in the cast state. The goal is achieved by the fact that martensitic steel containing carbon, manganese, chromium, molybdenum, vanadium, silicon and iron contains these components in the following ratio, wt.%: 0-5.0 Molybdenum0.3 - 0.46 Vanadium0.1 - 0.35 Silicon, 1 - 0.5 IronOstal The chemical composition and mechanical properties of cast steels are presented in table. 1 and 2. The structure of cast proposed steel after quenching from 900-950 s and tempering 200-300 0 consists of tempered martensite and a small amount of lower bainite. The resulting structure provides high ductility and viscosity while maintaining high strength.

Table 1

Claims (1)

The claims 40 Martensitic steel containing carbon, manganese, chromium, molybdenum, vanadium, silicon and iron, characterized in that, in order to increase ductility and toughness 45 while maintaining strength in the cast • state, it contains components in the following ratio, wt.%! Carbon 0.15 - 0.25 Manganese 2.15-4.2 Chromium 2.0 - 5.0 Molybdenum o .z - 0.46 Vanadium 0.1 -0.35 Silicon 0.1  0.5 Iron Rest