SU595420A1 - Steel - Google Patents

Description

The invention relates to the field of ferrous metallurgy, in particular to steels for the manufacture of welded structures of high strength, for which thermal treatment after welding is not allowed. Known steel containing, wt. %: Carbon 0.01-0.4 Chromium 8.0-20.0 Nickel 1.0-13.0 Silicon 0.05-2.0 Manganese 0.05-8.0 Nitrogen Up to 0.6 Aluminum Up to 4 , 0 Molybdenum Up to 4.0 Vanadium Up to 4.0 Copper Up to 4.0 Iron Rest 1 The disadvantage of this steel is the low magnitude of the work of propagation of fatigue cracks at low temperatures (down to -70 ° C), as well as insufficient viscosity and plastic properties . To develop special branches of mechanical engineering, high-strength nickel-free steel, which is sparsely alloyed by nickel, is required, which does not require heat treatment after welding and is operable at temperatures up to -70 ° C.

The aim of the invention is to provide a high magnitude of the work of fatigue crack propagation (atu) at temperatures

to -70 ° C with economical alloying of steel with nickel, as well as improved viscous and plastic properties. Steel must be well welded, possess satisfactory corrosion resistance under atmospheric conditions, in order to obtain the necessary mechanical properties do not require complex heat treatment, including after welding.

This is achieved by the fact that the steel is additionally containing niobium, titanium, and one or more of the elements from the group containing cerium and yttrium in the following%: wearing components, weight.

0,005-0,03

Carbon

Chromium

10.0-13.0

Nickel

0.7-1.5

Molybdenum

0.3-3.5

Silicon

0.02-0.5

0.5-14.0

Manganese

Niobium 0.05-0.25 0.05-0.4

Titanium

One or more elements from the group containing cerium

0,001-0,5 and yttrium

Iron Else

The content of alloying elements are given in table. one.

The mechanical properties of steel are given in table. 2

Table 1

table 2