SU800228A1 - Martensite-aged steel - Google Patents

Description

The invention relates to metallurgists, in particular, to martensite-aging steels, made of which molds for pressure casting can be used for the production of brass castings made of brass. Known martensitic steel became J H1OX11M2T, containing, wt.% Carbon 0.03 Nickel, 5-10.5 Chromium 10.0-11.0 Molybdenum1.8-2.3 Aluminum0.1-O, 2 TitanO, 6-O, 9 IronOtherly Disadvantage known steel is low temperature resistant. The purpose of the invention is to increase the steel resistance. This goal is achieved in that the steel further contains tungsten. dysprosium and gadolinium in the following ratio of components, wt.%: O, O05-0, OZ Carbon 8.0-13.0 Nickel 6, O-12, O 0.5-2.0 Molybdenum 0.5-2.0 Tungsten 0.6-1.2 Dysprosium 0, OO5-0.25 O, OO9-0.25 Gadolinium O, O5-O, 1 Alkminium Else, Iron, while the sum of nickel and chromium is 18-2O. Each of the alloying elements influences the properties of steel. Thus, nickel allows one to obtain a martensitic structure when cooled in air and gives the matrix a very high plasticity. Chromium increases the strength and resistance to oxidation, and also reduces the adhesion of the 1N interaction between the steel and the manufactured product, molybdenum tungsten contribute to the increase in strength. Titanium increases the strength of steel, forming intermetallic compounds during aging, and gadolinium and dysprosium increase its heat resistance. Carbon is an undesirable element therefore its content in the proposed steel is minimized. Aluminum helps to deoxidize the metal.

The limits of the content of alloying elements are determined by the nature of their influence on the structure and properties of steel.

Example. Steel is melted in 10 kg of an open induction furnace.

In tab. 1 given the composition of the proposed (smelting) and known (smelting 5-6) steel

Lys from ingots produce specimens for mechanical and heat resistance tests.

The test results are presented in Table. 2 and 3 (melts 1-4 - proposed steel, 5-6 - known).

Table 1

Table 3

Continued table. 3

Claims (2)

Claim 1. Maraging steel, containing carbon, nickel, chromium, molybdenum-20 prices, titanium, aluminum and iron, which requires that, in order to increase heat resistance, it additionally contains tungsten, gadolinium and dysprosium in the following the ratio of components, wt.%: 0.5-2.0 0.6-1.2 0.05-0.1 0.009-0.25 0.005-0.25 The rest, Tungsten Titanium Aluminum Gadolinium Dysprosium Iron 2. Steel pop. 1, I distinguish - and I'm with the fact that the amount of nickel and Have carbohydrate 0.005-0.03 Nickel 8.0-13.0 Chromium 6.0-12.0 Molybdenum 0.5-2.0 ni of chromium is equal to 18-20.