SU922172A1 - Steel composition - Google Patents

Description

(54) STEEL

I

The invention relates to metallurgy, in particular to steels for mill rolls.

The closest in technical cost and effect to be achieved is steel 1, containing, wt.%: Carbon1.1-1.3

Silicon0.4-0.6

Manganese 0.8-1.0

Chrome. 0.9-1.3.

Nickel0.3-0.5

Molybdenum 0,25-0,35

Vanadium0.05-0.12

Zirconium 0.05-0.12

IronErest

However, despite the fact that steel is known to have a high complex of mechanical properties, it has unsatisfactory heat resistance, it is associated with an increased amount of carbide phase, coarse grain and an increased amount of non-metallic inclusions ..

l

The aim of the invention is to thermally treat the steel.

The goal is achieved by the fact that steel containing carbon, silicon, manganese, chromium, nickel, molybdenum, vanadium, zirconium and iron additionally contains calcium in the following ratio of components, wt.%:

Carbon 0.5-0.9

Silicon0.4-0.6

Manganese 0.6-1.0

Chrom1.4-2.0

to

Nickel0.1-0.6

Molybdenum 0.15-0.40

Vanadium 0.15-0.25

Zirconium 0.02-0.25

Calcium0.005-0.15

IS

IronErest

 Calcium in steel contributes to the reduction of sulfur inclusions, their globularization, and also to the refinement of grain, which ensures an increase in the thermal stability of the bone material. The amount of added calcium supplement should be in the range of 0.0050 .15%. This content is missing below.

3922172

the effect of modification (the sulfur is not bound), and the higher the number of non-metallic inclusions sharply increases, which degrades the quality of the metal.

 . . .five

In tab. 1 presents the compositions known

and the proposed steel.

. The steel is smelted in 200 kg of an acid-lined induction furnace. Charge 10 consists of steel scrap and electrode bo. Lead additives are introduced into the furnace, and the SiCa modifier is introduced into the ladle. The metal is poured into dry-sand forms.

 15

Claims (1)

The claims that, in order to improve heat resistance, it Steel containing iron, carbon, creamy ratio of components, wt.%: Research institutes, manganese, chrome, nickel, molybdenum, Vana-Carbon 05-09 PIUS. zirconium, different from thatCrystalline - about, 4 - About 6 Sample steels are made of specimens which are subjected to tensile, bending, impact hardness and heat resistance. The tensile strength was assessed on Gagarin samples, static bending on samples of 10x10x60, and impact strength on samples of 10x10x55 without a notch at room temperature. Thermal stability tests were carried out at Thxiy 600 ° C. In tab. 2 shows the mechanical properties of steel. The proposed steel provides a high level of mechanical properties and heat resistance (1.7 times) in comparison with the known. ITA BLSA 1 table 2 55 contains calcium in addition to food u0, 6 - 1.0 1.4 - 2.0 0.1 - 0.6 0.15 - 0.40 d.lS - 0.25 0.02 - 0.25 Calcium0.005 - 0.15 IronErest REFERENCES Information received in. attention during examination 1. USSR author's certificate N 194323, cl. C 22 C 38/50, 1967.