SU621785A1 - Steel - Google Patents

Description

one

FIELD OF THE INVENTION The invention relates to the field of finding compositions of steels pre-made for the manufacture of back-up rolls, solid-rolled or bandaged.

Famous steel 9HF, 75XM have a relatively low hardenability and tempering.

Closest to the invention is steel composition, wt. %:

0.85-0.95

Carbon

Silicon 0.2-0.4

0.2-0.45

Manganese

Chrome 1.4-1.7

0.1-0.25

Vanadium Else

Iron

The disadvantages of this steel are relatively low non-rakiness and hold-up time.

The aim of the invention is to increase

hardenability, from hardness to hardness, which is achieved by additional doping with molybdenum, titanium and calcium in the following ratio of components, weight. %:

Carbon0.65-0.75

Silicon0,2-0,4

Manganese 0.61-0.9

Chrome0.9-1.2

/ Lolybdenum 0.9-1.2

Vanadium 0.1-0.2

Titanium0,004-0,05

Calcium0,002-0,05

IronErest

As impurities, the steel contains sulfur and phosphorus in an amount up to 0.03 wt. %

The chemical composition of the investigated heats of the proposed steel is given in table. one.

Table 1

Mechanical properties

investigated steel () and from the proposed

621785

known steel 9HF (4) after normalization and tempering are given in table. 2

table 2

Claims (1)

Invention Formula Steel predominantly for rolls, containing carbon, silicon, manganese, chromium, vanadium, iron, characterized in that, in order to improve hardenability, tempering resistance and hardness, it contains dap (.1 contains molybdenum, titanium and calcium in the following ratio of components, weight .% 0.65-0.75 0.2-0.4 0.61-0.9 0.9-1.2 0.9-1.2 0.1-0.2 0.004-0.05 0.002-0 , 05 Else