SU1643126A1 - Method for blooming - Google Patents

Description

one

(21) 4674099/02 (22) 02.15.89 (46) 04.23.91. Bul N 15

(71) Dnipropetrovsk Metallurgical Institute

(72) V.V. Getmanets, V.L.Romanchenko, S.S.Tilga, O.V. Filonov, B.F.Babay, V.D. Petrichuk, I.T. Rotaru, V.N. Valuev

and I.M. Lyubimov (53) 621.771.04 (088.8)

(56) Tarnavsky I.Ya. and others. Rolling on the blooming. M .; Metallurgizdat, 1965, p. 135,161, 183.

Steel, 1973, No. 9, p. 815-817.

(54) BLUMING ROLLING METHOD (57) The invention relates to ferrous metallurgy and can be used for rolling ingots on blooming. The purpose of the invention is to improve the quality of the rolled surface and reduce metal scrap. The method of rolling on blooming involves the sequential squeezing of an ingot with convex edges, with the subsequent rolls of the roll. The rolling of a rectangular ingot with convex edges is carried out in the first caliber, the creeks of which have a convexity defined by expression. 1 il. 1 tab.

The invention relates to ferrous metallurgy and can be used when rolling ingots on a blooming.

The purpose of the invention is to improve the quality of rolled metal and reduce scrap metal.

The method consists in rolling a rectangular ingot with convex edges in a first caliber, the creeks of which have a convexity f 1.65 exp (0.24n + 0.012Ahcp + 4.55 lg / hCp),

, 65,

where h is the number of passes; AhCp - media reduction value; lg / hcp - the ratio of the length of the arc of capture to the average thickness of the roll (factor shape of the deformation zone).

The drawing shows the configuration of the first caliber of blooming rolls and the change in the cross section of the ingot during compression.

The configuration of the first gauge rolls of blooming has been established as a result of experimental studies of the characteristics of the shape change of the lateral faces of the roll in

the first caliber of blooming, which has a flat and concave shape. Experiments were carried out on blooming 1300, when rolling ingots weighing 8, 10, 12 tons, as well as on a laboratory mill 130; lead samples imitated ingots on a scale of 1:10. The value of the convexity of the first-caliber stream is rational according to research data, depending on the average reduction in hep A, the number of passes h and the shape of the deformation zone lg / hcp, is determined by the equation; .eSe e0 012.559 Example. Converter production ingots of steel grades 20 and 40, R1R cross section

n-t s-sts x 2100 mm and weighing 8.5 tons

/ OE X O / O

each is heated in the heating wells of the blooming workshop from 550-900 ° C to 1300 + 10 ° C for 5.5-6 hours. Then, on the 1300 blooming, ingots are rolled into blooms with a section of 300x300 mm according to the reduction mode 2 (1) q4 ( 1) к4 (И) к2 (1И) to 1 (1 V) K. The first caliber of blooming rolls has a convex shape of brooks, the magnitude of the convexity f

J

CJ

N3 0

read by the equation depending on the technological parameters of rolling.

The results of the tests of the proposed method in comparison with the known ones are given in the table, from the data of which it is clear that when obtaining blooms by the proposed method, the degree of shortening of the surface of blooms decreases by 1.5-2.3%, and the bottom cut size is reduced by 25%.

The table shows the test results of the proposed method in comparison with the known.

Claims (1)

Invention Formula The method of rolling on blooming, including sequential compression right five coal ingot with convex edges in rolls with gauges and turning, characterized in that, in order to improve quality and reduce metal scrap, the ingot rolling in the first caliber is carried out with the generator, the convexity of which is determined by the formula , 65exp (0,24n + 0.12Ahcp + 4,55lg / hcp) MM, where l is the number of passes; A hcp is the average amount of reduction; Ig / hcR / is the ratio of the length of the arc of capture to the average thickness of the roll (factor shape of the deformation zone).