SU1285009A1 - Method of producing carbon converter steel - Google Patents

Abstract

This invention relates to the production of carbon steel in converters. In order to increase the degree of dephosphorization and desulfurization, carbonate manganese ore in the amount of 5–10 kg / t of steel is introduced into the converter during the purge period, with the first port1 being seated during the period of 5–10% of the purge time and 0.15-0.30% of the amount given on the basis of 1.0-1.5 kg for every 0.05% reduction in carbon content. 1 tab. cl

Description

YU

00

SP

112

The invention relates to the field of ferrous metallurgy, namely to the smelting of carbon steel to converters. The purpose of the invention is to increase the degree of dephosphorization and desulfurization of metal in the converter and to improve the technical and economic indicators of the process.

The essence of the invention is that in the production of carbon steels with a stop at a given carbon content, it is necessary simultaneously with the provision of a specified carbon content and temperature to obtain low values of sulfur and phosphorus in the metal, i.e., full interconnection of the blast and slag modes of converter melting is necessary , Additional difficulties arise in the use of low sulphide iron. All this together predetermines the need to use complex materials that effectively affect both slag and blowing modes. Moreover, taking into account the specifics of both stopping at a given carbon content and the technology of low-slug cast iron, the introduction of manganese carbonate ore should be carried out only at a certain carbon content with a one-time limitation, in order to ensure the degree of desulfurization and dephosphorization of the metal, high technical and economic indicators process,

In the proposed method, the ore additive provides, at the beginning of the purge, optimal slag formation conditions for effective desulfurization and metal de-fosforadium due to the rapid passage of the heterophase region.

2CaO SiO. And it is the additive in the first

2- „

moments of purging manganous ore with a carbonate oat leads to a shift in the slag saturation of 2CaO SiO towards saturation with simple silicate CaO SiO s which leads to a sharp increase in the distribution coefficient (S)

In addition, when approaching to a given carbon content, the addition of manganese carbonate ore makes it possible to reduce the content of iron oxides in the slag without compromising the physicochemical properties.

0

five

0

five

0

(TO)

mapgchchg;, ozone ozone (-1 TCKIJ.KO rc j OMy ifo BOJrneT mode failed on the put chain.

Entering carbonatnsshl rganpezoy ore; in the first half of the first 5% of the agricultural production: THREE-- will lead to unstable gogesh-1

agiva1,

BPeMefiH ;; p :; : mock perip,:; pg kg: - krololit to oygie

 takeaway from kg; 1tverter ;, CHi-gzheniyu lining durability, vxv, njupiniKi :: e-phosphoration and forest sulphation radios ms lll. In addition, the most significant l, p stops at a given carbon and carbon content is the moment of the addition of the mart-angevic carbs –natural rudder, when it is filled with carbon oil, and is: more than 0, 15% BI, talanlott lritktlit to obtaining a carbon content below the required values. G1rn-setting ore with a content of carbon and carbon higher than a; This5 does not allow rapaiiTnpoija iHo to provide the required values of carbon and phosphorus in the metal. Studies have established that the licrites of carbonate manganese ore in this period should be 150-1 „5 kg / ton for every 0.05% decrease in carbon content. p -) and its total consumption of 5-10 kg / t of steel. An ore additive less than 1 kg / t is not (it does not require the required mixing of the metal due to the release of CO when it decomposes and does not affect the decarburization rate of the metal; it does not provide replenishment of the melt degassing. The ore additive is more than 1.5 kg / ton for every 0.05% of carbon content, carbon dioxide, significant boiling of the metal, overheating, and covari melting. The total carbonate manganese ore less than 5 kg / ton of steel provides an early plakoobrazi 5i ,, reducing emissions and metal emissions required degree of desulfurization When defosforatsiis and overall consumption of more than 10 kg / t steel can not provide the required melting temperature regime

properties of the slag and ensure the decarburization rate,

The speed of metal decarburization.

Studies have found that the carbonate additive

To assess the materiality of the parameters of the proposed method, a series of experimental heats was carried out with the release of each parameter in turn

for upper and lower boundary values. In addition, melting was carried out at lower, upper and middle values of the indicated parameters and in accordance with the known method.

Examples Experimental melts were carried out according to the following technology: 100 tons of scrap were poured, 310 tons of pig iron were poured, 10 tons of lime were placed on the scrap, and oxygen was purged through a 6-nozzle with a flow rate of 900–1000 nm / min. In the course of the blowing process, dispersed along the grains and slag-forming materials, including carbonate manganese ore, were spent. The purge was completed to give the required carbon content and metal temperature. Consumption of melted steel for smelting was 17-18 TE-JC, m

The qualitative and quantitative results of the heats carried out in accordance with the proposed and known methods are presented in the table with

The data of the experimental heats showed that the use of the proposed method, while observing the specified parameters, allows to provide the required serum and phosphorus contents after purging, to ensure high technical and economic indicators of the production technology of high-quality carbon steels.

Form m u l

the invention

ten

The production method of carbon converter steel, which includes the use of steel scrap and iron materials, hard iron, milling of oxygen, variable position of the tuyere, and dispersed dross-slag additive-gkh material} s as miixroBbix and stopping of blowing at a given carbon content, l so that, in order to increase the degree of phosphorus 51 desulfuradiya metal, carbonate manganese ore in the amount of 5-10 kg / t of steel is injected into the converter, and the first porta1-G | o t in the period of 5–10%, the purge rate of the blowdown, and the rest of the amount — with a carbon content of 0.15–0.301 higher than the preset value; ijO-I.S kg / t calculated by 0.05% decrease in the carbon content.

oh oh c

about w and

WITH

to

Claims (1)

Claim A method for the production of carbon converter steel, including the use of steel scrap and molten iron as charge materials, oxygen purging with an alternating position of the lance and dispersed doping of slag-forming materials1- * during the smelting process and stopping purging at a given carbon content, ni and d to I in that with increasing degree of integers defosforatschi metal and desulfurization, ^ζυ by blowing converter in the course carbonate manganese ore is introduced in an amount of 5-10 kg / t steel, wherein the first portion of perching m between 5-10% of blowing time, and the remainder - when the carbon content in 0,15-0,307 above a predetermined rate of 1.0-1.5 kg / t per each 0.05% decrease in carbon content. 1 a B about in about m K n SZ about 5 about and ABOUT ίΧ! X ABOUT ABOUT about? rj tc !4 sz I ιτί I Si £ · .. >> m se 1 about B4 0) I S IN Λ to about 03 ί F I 1 1 § Ej h 0j aS I η " E * 1 about about Φ | e Μ X 1 1 1 ₽ch 1 1 and X 1 f about and 1 to ® from W I I to >> 1 1 03 Φ f in. I ! * Λ R about 64 I 0 <1 f ABOUT ·& 5 e 1 1 I Cj E- 1 ! ABOUT about F f I 1 ° * & X IN 1 J 10) 1 t T -—Η 1 to φ about I I 1 x X about £ 1 thirteen from IN 1 1 to I about 1 1 O. f ABOUT. 64 1 f S from in 1 ί in 0. Ts 44 ! 1 o F cp about s I 1 ω ι. 1 υ G- in s 1 ~ n t 1 ! 1 I <5 I 1 1 in 1 1 I 1 I S 0 $ IN 1 1 st I I m About 1 1 1 ABOUT l 64 f Si L 1 1 m *I b 1G | & f F 1 1 1 ί and E £ ABOUT Ξ in IN 1 t "and >> I e " and about I | 1 J 3 1 U 04 l " ABOUT about about ± J 1 in 1 f I 1 th I S about W about S 1 0. I I I X n and 1 1 x i f about "3 well I ABOUT. 1 1 Η to No. f about t Y- 1 d well 0. X "J in 1 § 1 AND pz f about in 1 1 i 1 About F in in X about " ) £ 0J about I about 1 ! ^s 1 Cu I 1. to η and I in © < 1 ί 1 V 1 "4 -1 1 1 i TO 1 I s i I ft S X f I s. 1 si φ and I X 1 1 I from in 0. f I 1 1 Φ 1 about X I ! 1 midrange 1 tt s in f S 1 1 1 1 § to ABOUT. in 1 1 f •a > x I about 1 I 1 J 0. Ctf about L 1 1 AND and I 64 in Th 00 h £> g- Joint venture <* in cp <r LT) Lh ** 9ι "4 e \ ¢ 4 l 51 about about about about about about ABOUT about ABOUT ABOUT Ln FROM/ g- with 00 cn um <( with cho G- cho about about about V— h— h-- 1- about about about about about about about about <2> about about g; 9\ 64 <l ₽1 S4 04 from about about about about about about about about about about about About CN si t— with .— ί- Τ- >. ABOUT Ο Ο about X - 9. 04 oh oh about ABOUT about G-- cho with cho h— h— ? - h— about· ABOUT about ABOUT σ l f. about about about •-By in about oh sch SP ¢ 1 s o about about about Uh 0> t- > 4 CM about LA 00 With cm Joint venture h— H --- GM h— CM 4-- Joint venture cm l ₽ ₽ » "4 "1 (4 about e \ 04 about from about about about about about about about about about tn 00 about> CaF additive with a total flow rate CO LD CM hr g *. Cho SO