SU695730A1 - Method of manufacturing transformer steel strips - Google Patents

Description

I

The invention can be used in the production process of hot rolled rolled steel transformer steel.

A known method of producing strips of transformer steel includes melting steel, heating ingots and rolling them into slabs, heating slabs for hot rolling at a temperature of 1250-1350 ° C, depending on the content of chemical elements, mountains I feel rolling of the strip on the strip, etching, single or repeated cold rolling with intermediate heat treatments and final annealing I.

However, the heating of slabs in methodological furnaces is accompanied by their melting, the formation of liquid slag, which accumulates and hardens in the lower and tilable zones of methodical furnaces. Therefore, the furnace is periodically stopped for hot cleaning and cold repair. In addition, the heating mode of the slab of each heat (duration of heating and languor, metal heating temperature) is functionally related to the content of chemical elements. Thus, & time, each melting is carried out according to individual mode.

The purpose of the invention is the formation of the necessary inhibitor phase, a certain size of the structure and texture of hot rolled and cold rolled strips and obtaining high magnetic properties of steel. To achieve this goal, rolling a hot rolled strip is carried out with predetermined heating rates of slabs and semi-slopes, with certain intermediate cooling rates, and strain values.

The method is carried out as follows.

1. Heating of slabs in furnaces up to 1170-1220С (on metal) with a speed of 6- (HS /.

In this mode of heating, slab melting and slagging of furnaces are eliminated.

2. Cooling of the slab in air to 1120-PBEC: at a speed of 12–20 ° C / min. In this case, averaging (equalization) of the temperature over the slab sections occurs, the influence of the slip pipes and the monolithic bottom of the methodical furnaces is eliminated.

3. Heating of slab-5 in high-temperature / rny furnaces with a hearth monolith up to 1370-14-14 С (for metal) with a speed of 2.5-. In zones of penalties, the temperature is equally high, and the complete dissolution of su, 1b (}: 1cdop and oo.iiee is completely removed, and the complete removal of sample liquid from 1ilac via syetsialy tapes.

4.) slab roll up to the interim

shskagov nrp relative compression 759 () Vo () D1K) time by single cooling to

 000- - I i OOS eo with a speed of 100-- 1 50 (:; m and I. lipii this requires a ping1g1ch) phase of meta / 1la.

5.Magrev of intermediate rolls at the entrance of the heating furnace up to 1070

1 170Ч (-.Ч) to metal) with a speed of 90

120 (; / min for aligning TeMiieparv-ry but ccHeiHiio p.1iie rakatov on both-11 11 11 och och 1chat, deform;: 1 with the required temperature p st rtur | -, | meta; .l.

6. (), irikatka iri relative rev / katpp 85 95 / (, with simultaneous cooling to the temperature not required at speed, 200 Å-ZOO-C / mip in order to provide the required structure | 1y (grains) and texture O1) chekatapi151x hollow MaiitLB

SLYAB |) CHAIR () DIPS WITH YUSTOYAPY SKO1K) SHE,

with the help of the i-i cable to a constant temperature, it does not depend on chemical chemistry.) The composition of the steel has become a workplace.

l / piMcp. C / gal, naripiiAiep, silica ltekrotechpicheeka, and. Cociafi / s, which has: cocoa filth more than 0.045, silicon 2.8-3.30, margapen 0.05-0-0.12, ehir 0.017-0, (.30, f (x- (hof) not bo, 0.020 /,;. Chromium more than 0.05. No.; 1u to 0.1, copper up to 0.08, a / yiu il-up to 0.005. Nitrogen up to 0.008 , oxygen 0.008, founding 1H1st in 13) 0-to1CHN1; 1x converters, S.Ptkis with 12.7 tons of heat are heated nnr () cat)) are paired with 1300 i-ia p.1 b1 1 size (1 mm Before the first day with 1, 1 would be heated in furnace furnaces with temperature in zones of 1230 ° C to 1200 ° C (but meta.a,) at a speed of 7 (, /} L1-: n for 170 minutes. .m with; 1 within 4 min o.azhdayu1 on pgkhpyapg up to a speed of Zla.iee with; 1 would come in 1; 1-1СКО1-temperature pechp e mono.titnoy nodina and liquid yukakoudalen em. In the semi-thermal furnaces iri temperatures iio zopa.m 1440 (there would be 1 or1 to 1 -110 ° С (but meta.1. | Y; skorshtyo (7 / .min for 90 mpps .3; i 2.5 min would eat on a rollgun. M transmit to us two-circuit network ccm remote ciaii 230 (j , rolled for 4 passes to P1X) interstitial rolls with a thickness of 24 mm n) and a relative reduction of 85, with a temperature of 1050 ° (served in a preheating furnace, (the speed {cooling at that 144 ° C / mip.

PI 1K) do1revate.nnogo Iechi with temeTVIAx but zones 2 () () (.

0.7 min Ha peiia; oT to (i; o metal) at a rate of nag Eva; 00 C / min,

Then, within 0.85 mch; -: rolls and use rolyapgam on 1 continuous CTai1700, roll up to the final tolitine of a hot-rolled tackle 2.5 .mm in diameter and relative reduction; 89.5Vo. TspAccline end rolling. The cooling rate is 247C / MKiJ. At the outgoing roll, a strip of 1700 strips is cooled with water from a laminar installation and wound into rolls.

For events of the same type.) Of () the shtpos occurs; su; P) feeds in pa | -revate, ;; 1L1yh furnaces, form the Sovper1epia and raviomeona strktura. flows;) a, lla, high mappings with CBoiie; 3a ho, o; dk) KLannyh bands and n} okata (h; checkpoints; o:: dca: a i poizv (jJJits |)); 1 time from high ig: Ude; 1b ::; h: e note;) i: P in ready-made cold | 1 () catalomania, but I, and eah result with less than the proposed loIia spnzi:

- d.n cold Noah 0.5 .mm s, 05 1.50

--- d; 1 coldbox

| 5th ta.tei zysp ;; fvsapoK (34 i 5 p 34 4) for. Loss () Dittelp (.1ST11 rollers increased to 1.2 ra.

, production (; available for. ius ii3 IpancraopMaixjpnoii stat.ti. including ucha they1YV111i.plavka and casting MCTa.Tia. G (.g) npoKari v with:; and cov b b, heating, n; a) heel: a. IH yiijor-oKiiaTiVK; holsdnhyu nrokatk with irs; 1 daughters ;;; lm: le;) with n-1 treatments, p envelope; 1 body) ПЫ1-; annealing, characterized in that it is (i) (| jopimanian pngnbitor phase, 1oob-one 11mm dimensions et 1) and teketet;) |, 1 io, l (.) c and obtain high magnetic properties, steel, rolling the hotplate of the 1st to the 1st rolling of the ipod is heated up with the slabs to the temperature of 1170-1220C at a speed of 6 0 (/ min. cooling them in air to temnerehr1z1 1120-1160 (. its speed is fast (to: 12--20) (; min, heating to a temperature of 1370-1440 (, eo at a speed of 2.5-4 ° C / .min, rolling d, about inter-interdigital peals at a relative compression of 75-90 ° / oc simultaneously cooled to 1000 - 100 ° C the speed of 100-- 150 ° C / mi11, ||} between (peremplate rallies) up to Ki70--1 70 temperature (; at a speed of 90-120 ° C / min, notching; 1 Knook) nro, 695730 9 roller with relative reduction with simultaneous cooling to a temperature not lower than 900 ° C with a speed of 200 - 300 ° С / min., О О Sources of information taken into account during the examination 1. USSR Copyright Certificate 373324, class B 21 B 1/38, 1972.