Nickel-saving type cobalt-free martensite aging ultrahigh strength steel

Abstract

Alloy steel with no Co and less Ni is available to be thin-wall cylinders or springs or gears, containing (wt%): Ni 11.5-14.5, Cr 3.75-5.25, Mo 2.25-3.75, Ti 1.2-1.6, and elements following below not more than the value behind: C 0.03, Si 0.1, Mn0.1, Al 0.30, Co 0.50, S 0.01, P 0.01, O 30ppm, N 30ppm, balanced with Fe. It has high yield strength, high plasticity, toughness, and excellent machining performance.

Description

technical field [0001] The invention belongs to the field of alloy steel, and particularly relates to a nickel-saving type cobalt-free maraging super-high-strength steel, which is mainly suitable for high-strength spinning thin-walled cylinders, springs, gears and the like. Background technique [0002] In the prior art, most of the materials used in the manufacture of high-strength spinning thin-walled cylinders, springs, gears and other similar parts are 18Ni-containing Co maraging steel, which was first produced by the International Nickel Corporation (INCO) in the early 1960s. Developed, the scheme is to add different contents of cobalt, molybdenum and titanium to the iron-nickel martensitic alloy, and obtain 18Ni(200), 18Ni(250) and 18Ni with yield strengths of 1400, 1700 and 1900Mpa respectively through age hardening (300) steel, and later developed 18Ni (350), 13Ni (400), but because it contains a large amount of Co elements (7.5-15%) and a large amount of Ni, the cos...

AI Technical Summary

Problems solved by technology

However, these steels still contain a large amount of Ni, and the performance of some low-Ni maraging steels cannot reach the level of the current 18Ni-containing Co steel. Therefore, it is necessary to develop a Co-free and low-Ni maraging steel to make it perform Comparable to T250 steel

Images