RU1825320C - Method of production of thick metal sheets - Google Patents

Description

The invention relates to metallurgy, mainly to rolling of thick sheets from ordinary, structural, low alloy grades of steel and alloys.

The purpose of the invention is to reduce the specific consumption of metal. The goal is achieved that the removal of the defective end of the bottom slabs from the open-hearth ingot and at the head and bottom slabs from the ESR ingot is carried out until a defect-free metal appears at a width of 0.5--0.7 of its width, and the samples are cut and the additional length of the sheets after rolling on a sheet mill from the side of the removed defective part of the end slab.

Moreover, if the defective part is removed from a non-rectangular part of the end slab at a width of less than 0.5 width

rake, then the remaining part will have a considerable length, especially with a large width of sheet roll, and this can lead to its opening in the process of sand on the sheet mill, getting under the wiring reinforcement and creating aerial situations

Removing the defective part of the end slab 1 lfipe more than 0.7 of the width of the roll is not advisable, since this will reduce the efficiency of the method without creating additional ones. rolling advantages.

Pi-T / itT GET SPORT km, o.1-nd - exit slabs with a volume of removal of the defective end, l, en in the table.

The method of arbitrariness of thick sheets is as follows

 merged is fed to the crimp stand of the boiler, where they are

00

go eat

CA) Yu

about

Oj

the size of the roll, which is then cut into the calculated one, and the end trim remains at the bottom slab from the open-hearth slice or at the bottom and head slabs from the ESR ingot, from which the defective hour is then removed until a healthy metal appears width 015-0.7 width of the roll. As a result of this to the mass of vodka part-; Slice M, accepted for calculation by a known method, is added with an additional suitable mass of the ingot Mi. due to the possibility of using, for the intended purpose of bottom cut-off, sheet rolls rolled from the Khontsevsky slab in the amount of 2.5-5 of its mass in connection with the presence on it of an additional terminal O-cut of sl 5g.

. (0.025-0.05), "g, where m is the mass of the end slab, kg;

M. - the additional mass of the suitable part of the cage obtained by cutting the sunset, which switched to rolling from the end slab within the width of the trimmed edge if

 -h -y -y, kg

where B and 3-; - width of sheet and sheet roll, dm

h is the sheet thickness, dm;

specific mass of steel, kg / dm3;

h - the width of the additional part of the roll is equal to

Bi-B

and --eg a

where a is the angle of inclination of the sunset to the side edge of the sheet.

Accepted at “--45 °, tga H, the formula will take the form

M2- h B y

kg;

additional mass of the suitable part of the ingot due to blanks for primary (Ms) and repeated (Ml) tests cut from the non-rectangular part of the roll, but for which, using the known method, lobotoyalas would have an additional mass of a standard slab

Mz and, (1z) h y. kg, where 2 and 1z are, respectively, the width of the workpieces for initial and repeated mechanical tests, dm;

specific mass of steel, kg / dm.

When rolling an ESR ingot, the achieved metal economy doubles.

In FIG. 1 shows a scheme for cutting an open-hearth ingot; in FIG. 2 - ZHP ingot according to the known and claimed methods: in FIG. 3 - cutting sheet roll according to the known method, where 1 - trim holoins,

2 - bottom trim, 3 - side trim. 5 and b, respectively, blanks for primary and shameful mechanical tests; in Fig. 4 - cutting sheet roll out of the end slab according to the inventive method, which explains the essence of the resulting metal saving, where 1 is the head trim, 2 is the bottom trim, which, due to the presence of the end trim on the slab, turned into fit

leaf mass - Mi, 3 - side trim. 4 - an increase in the length of the suitable part of the sheet due to cutting of the side sunsets that have passed through its slab within the width of the cut-off side trim - M2, 5 and b - blanks for

primary and repeated tests cut from the non-rectangular part of the roll mass of Ms and Ml.

Example. Estimated mass of the suitable part of the D-13 ingot according to the existing cutting technology, 2 t.

We assume that we cut the ingot into four slabs with a mass of 2.8 tons, of which we roll four sheets with a thickness of 20 mm VI and a width of 2000 mm. Then the additional mass of the ingot (Mi) is accounted for by the possibility of using, for the intended purpose, the bottom trim of sheet roll as a result of applying the method in a volume of 2.5-5% of its mass - t (kg) (2)

MV-ITI - (0.25-0.05h2800 - (0.375) 106 kg additional weight of the suitable part of the ingot (M2) obtained by cutting the sunset about the limits of the cut edge. We accept the defect angle of 45 ° different vi the cut width edges on o5e side of the roll 120 mm, then

 h 21,20-20

Bi-B

.. h

2

B. u, -.-. h B in 0.20 -20 -7,, 8 kg;

5

0

5

the additional mass of the suitable part is SLIGKE due to the blanks for primary (Ms) and repeated (M / i) mechanical tests cut from the non-rectangular part of the sheet roll due to the application of the method with their average width, 75 dm and 75 dm (4) will be :

Ms + MI, H3) ft -3 -y (0.75-H, 75) x x 0.2 -21.2-7.35-15.

Total savings due to the use of the poQHs method:

Ek. met.M1 + M2 + Mz-M /, (kg) --106- -18..8 kg.

Based on 1 ton of good hour of the open-hearth ingot, the metal economy will be 1

, 8 ,,,, - - g- and -g / t

In the production of smooth plate steel of ordinary orders, 300 thousand tons per year will save metal

0.025-300000-7500 t.

With an average cost of harvesting 185 r / t and trimmed 50 r / t, the economic effect at one enterprise will be:

Claims (1)

Et 3-7500 (185-50Н 012500 RUB. Claims) A method for producing thick sheets, including heating an ingot, rolling on a crimping mill, removing defective ends 0 blanks, cut to slice, resulting in hot rolling on a sheet wall. sampling for mechanical testing and cutting to measured lengths, characterized in that, in order to reduce the specific consumption of metal, the removal of defective ends of the workpiece is carried out until a defect-free metal appears at a width equal to 0.5-0.7 of the slab width, and mechanical testing samples are cut out from the rolled end slabs from the remote defective end. ABOUT 7 about Fig 2