SU933784A1 - Ferrite steel composition - Google Patents

Description

The invention relates to Meth, in particular, to high-chromium ferritic grade, corrosion-resistant materials are used. The closest to the essence and the achieved effect of the proposed is ferritic 1J, containing, weight: 0.01-0.06 Carbon 17.5-29 0.3-1.5 Silicon 0.1-3.5 Manganese 0, 51-1.5 Zirconium 0.03-1.2 Aluminum 0.005H, 5 Vanadium Rare-earth 0.001-0.1 Metals Iron Else The disadvantages are the low technological capacity and the yield of peat bars. The aim of the invention is to improve the technological plasticity and the identification of the yield of suitable for re-spaced. This goal is achieved by the fact that carbon steel, aluminum, manganese, chromium, aluminum, goat metals, zirconium, and eso containing steel additionally contain titanium with the following ratio of components, wt.%: 0.05-0.15 Carbon Silicon 0.2 -0.8 Manganese Chromium 0.03-0.1 Aluminum Rare-earth 0.005-0.03 metals 0.005-0.035 Zirconium 0.01-0.9 Titanium Iron Rest The amount of rare-earth metals and horses 0.015-0, OA.

The steel is smelted in an LPZ-67 type induction furnace with a main crucible.

The compositions of the produced steel are given in table. one.

The steel of each composition is poured into two ingots. One ingot is cut into samples and the level of technological plasticity is determined by the torsion test method at deformation temperatures. The second ingot is subjected to redistribution by forging on square rods (30 mm side of the square). The yield of a suitable metal is defined as the ratio of the weight of the rods not affected by cracks, flaws and delaminations, to the weight of the metal, which is set in a repartition.

The results of testing the samples for torsion and the yield of useful after redistribution of ingots of steels of different composition are given in Table 2,

The tests carried out show that steel is known when casting metal from the Scissors in comparison with

the proposed product has a high viscosity and a tendency to foaming, as a result of which the surface of the ingots is affected by twisting and captivity, which in the process of deformation serve as foci of nucleation of flaws and metal delamination.

The proposed steel contains titanium. It is known that titanium forms strong nitrides in a high-chromium melt, which are centers of crystallization, which leads to efficient grinding of grain in the ingot and an increase in the hot plasticity of the cast metal.

In comparison with the proposed, ingots of known steel have poor surface quality, low technological ductility, which leads to the formation of cracks, flaws and delamination of metal during deformation and, as a result, 6–9 lower yield of the metal than in the conversion of ingots of the proposed steel.

table 2

Claims (2)

Claim 1. Ferritic steel containing carbon, silicon, manganese, chromium, alu-ad minium, rare-earth metals, zirconium, iron, characterized in that, in order to increase technological ductility and increase yield when converting ingots, $ 4 is additional contains titanium in the following ratio of components, wt.%: Carbon 0.05-0.15 Silicon 0.3-1.0 Manganese 0.2-0.8 Chrome 24.0-30.0 Aluminum 0,03-¾, 10 Rare mill metals 0.005-0.030 Zirconium 0.005-0.035 Titanium 0.01-0.90 Iron Rest 2. Steel pop. 1, I am distinguished by the fact that the sum of rare-earth metals and zirconium is 0.015 “0.040.