SU606890A1 - Master alloy - Google Patents

Description

one

This invention relates to the field of ferrous metallurgy, in particular to alloying alloys.

Known ligature of the following composition, wt.%

30-50 Up to 15 Up to 15

20-40 Else

Known ligature does not provide a significant increase in the mechanical properties and cold resistance of steel, in particular steel-20L after treatment with this alloy has the following properties:

Tensile strength,

kg / mm 46, 3-50., O

Breaking the flow,

hg / mm2

TJ-T / LGL

Relative extension , %

Relative constriction,% 30.4-32.1. Impact viscosity, kgm / cm

at + 20 ° C 7.4–8.5 at –60 ° C. 1.9-2.6

The aim of the invention is to improve the mechanical properties and cold strength of cast structural materials ;: steels.

The goal is achieved by the fact that the proposed ligature contains components in the following ratio, weight,%:

25-50

flaxes

30-50 10-15 0.5-15 1-5 1-10 Else

 The proposed ligature with the ratio –j ± jll 0.35–0.6 allows alloyed cast carbon and low-alloyed structural steels to be alloyed, replacing such expensive deficient elements as nickel, moth, vanadium. Moreover, the mechanical properties and cold resistance of these steels are at a high level.

Example. The effects on the mechanical properties and cold resistance of steel 20L of the master alloy of the following composition (c / table 1) were investigated:

A 300 g ligature is laid on the bottom of the ladle and 30 kg of steel is produced. Ligatures have a particle size of 5-10 mm, the temperature of the cast steel.

The mechanical properties and cold resistance of steel 20L after treatment of its proposed master alloy are presented in Table 2.

Table 1

Table