SU721296A1 - Flux for flux cutting - Google Patents

Description

(54) FLUX FOR OXYGEN-FLUS CUTTING

metals in the following ratio, in wt.%:

0.02-0.08

0.3-0.80

0.2-0.50

4.2-12.8 M

0.8-20.0 REM

Rest

The initial charge for the preparation of the proposed flux is technical iron, silicon, manganese, sulfur, phosphorus, boron and rare earth metals. Moreover, REMs can be used both in the form of independent components — Y, Се, and La, and in the form of complex modifiers (SITMIISH-1).

The introduction of rare-earth metals into the composition of iron powder in the form of their compounds with boron and silicon made it possible to eliminate the selective oxidation of manganese and silicon at the cutting edges. chrome

l of iron, thereby increasing the homogeneity of the chemical composition of the base metal and the metal edge. This is due to the fact that elements such as the cerium and yttrium subgroups. f REMs are capable of increasing the density of the oxide film at the interface of the main liquid metal-slag by creating a forbidden zone for the diffusion of manganese, silicon, chromium and iron from the edge metal into the slag. Being surface-active elements, and having a relatively low solubility in a liquid base metal, rare-earth metals and their compounds are capable of inhibiting the mass transfer of the base metal components, the transition of which into the slag leads to an increase in the percentage of carbon at the cutting edges. The chemical composition of the flux, weight is given in table. one

Table

For the metallographic study, samples were made, made by oxygen-flux cutting, on cold metal and heated to 150-250 ° C. Cutting was carried out on an URHS-5 unit, made from flux-feeding and a cutting torch of RAF-1-65. The carrier gas is nitrogen.

no friction cracks detected externally

150

400

150

380

150

455 Metallographic studies of thin sections obtained in a plane perpendicular to the cutting edge showed that oxygen-flux cutting with the proposed flux composition causes structural changes in the heat-affected zone with limited penetration depth. The research results are given in table 2. Table2

Claims (2)

1. Flux for oxygen-flux cutting, predominantly high-strength steels containing carbon, silicon, manganese and iron, characterized in that, in order to increase the resistance of the metal of the cutting edges against the formation of cracks, it also contains rare-earth metal borides and silicides in the following ratio of components, weight.%: Carbon 0.2-0.08 Silicon 0.3-0.8 0.2-0.5 4.2-12.8 M 0.8-20.0 Else Clause 1, which is based on the fact that borides and rare earth silicides are contained in the form of complex modifiers. Information sources, 0 pints into consideration during examination 1. Author's certificate of the USSR 92007, cl, B 23 K 35/362, 190650, 2. GOST 9849-61.