Abstract:
© Published under licence by IOP Publishing Ltd. The composition and properties of three constructional microalloyed steel with vanadium, niobium and nitrogen is investigated. High strength and ductility steel in rolling mill products and in forgings were revealed, manufactured according to various flow diagram. The resistance of microalloyed steels to grain growth during heating to 1300 C has been established. The opportunity of realization of the forging heat forgings in their heat treatment is shown. Output testing was carried out of steels in the manufacturing crankshaft and engine connecting rods. For heavily loaded machine components, the use of 38G2AF, AC40H2NMAF and AC30X3NMAFB steels is recommended. High resistance to grain growth is shown when heating steels microalloyed with vanadium, niobium and nitrogen. High properties of the steel AC40H2NMAF, AC30X3NMAFB and 38G2AF make it possible to recommend them for the manufacture of heavily loaded parts - crankshafts and connecting rods. The possibility of realizing forging heat of forgings made microalloyed steels with vanadium, niobium and nitrogen during their heat treatment to ensure a high level properties and structural requirements.
