SU742478A1 - Steel alloying alloy - Google Patents

Abstract

ALLOY FOR STEEL BURNING, containing manganese, aluminum, cream. SRI, iron, carbon, distinguished with. so that, in order to reduce its melting temperature, increase the uniformity of distribution of alloying components in steel and simplify the technology of alloying, HE; additionally contains nitrogen and copper in the following ratio of components, weight. %: JfepraHeu. 30-55 Vanadium 6-15 0.1-15. Silicon Iron 16-40 Carbon Nitrogen t-6 0.5-15. Copper

Description

one

00 The invention relates to the field of ferrous metallurgy and can be used for the alloying of steel with vacuum, nitrogen, manganese and medrue. Known alloy for alloying steel of the following composition, wt.%: 6-20 Vanadium 3.1-2.0 Silicon 0.1-2.0 Carbon Iron Manganese Else The disadvantage of this alloy is that the melting point of the alloy is relatively high (above 1300 C also the fact that when it was used to alloy steels containing nitrogen and copper, it became necessary to additionally alloy the steel with nitrogen (for example, in the form of nitrated manganese) and copper. The use of the known alloy with a relatively high melting point for alloying steel in the ladle led t to uneven p & distribution of manganese and vanadium p volume and, as a result, deterioration of metal quality. The aim of the present invention is to reduce the melting temperature of the alloy and improve the quality of steel, as well as to simplify the technology of steel treatment with nitrogen and copper. This goal is achieved by the fact that the alloy for steel alloying, containing manganese, vanadium, carbon, silicon, and iron, additionally contains copper and nitrogen with slag cement with respect to the components, wt.%: Manganese Vanadium 0.1-15 { emne Iron 2.1-10 carbon 1-6 0.5-1 five. . Introduction of 0.5–15% to nitrogen, 1–6 and: increased (2.1–10%) carbon content in a known alloy leads to a significant (by 10–100 ° C) decrease in the melting temperature of the alloy. The use of the proposed mix eliminates the need for additional lsgi. Ravani became nitrogen and copper. The limits of manganese content in the alloy are selected from a value of 30%, due to the maximum possible iron content in the vanadium slag used in the production of the alloy: to a value of 55%, above which the productivity of the alloy smelting furnace decreases. The lower limit of the content of vanadium (6%) is due to the maximum possible amount of carbide introduced during the alloying of steel in the ladle; the upper limit (15%) is determined by technological distortions when crushing the alloy. The upper limits of the carbon content (10%) and silicon (15%) are due to the requirement of the most complete reduction of vanadium during the electrothermal and silicothermic alloy production processes, respectively. The lower limit of the carbon content (2.1%) is due to the need to use low and low carbon steels for doping, and, in addition, with this content, the melting temperature of the alloy already decreases significantly. The lower limit of the silicon content (0.1%) is due to the use of an alloy for alloying semi-quiet steel. The limits of the copper content are taken from a value of 0.5%, at which it begins to appear in: a decrease in the melting temperature of the alloy, to a value of 5%, at which a significant chemical heterogeneity of the alloy appears. The limits of the nitrogen content are taken in the range of values (1-6%) required to ensure the nitrogen content S of steel with nitride hardening in the required amounts (0.015 0, 030%). Such nitrogen contents in the alloy can be obtained by using nitrogen gas (in the liquid state) to produce it or diffuse our solid state. When the iron content is above 40%, the alloy is poorly crushed, and if iron is present, less than 16% is obtained. little things. Example. The alloys of the proposed and known compositions were used to alloy calm (14Г2АФД, 16Г2АФД) and semi-quiet (15Г2АФДИС) steels according to GOST 19282-78. Steel was smelted in 300 tons of open-hearth furnaces according to the adopted technology. The temperature of the metal at the outlet was t620-1635 ° C. Metal containing in wt.%: 0.03-0.15 carbon, 0.11-0.20 manganese, traces of vanadium, 0.003-0.05 nitrogen, 0.05-0.13 copper. released into the ladle without preliminary oxidation. The metal alloying of the heat sinks was made completely in the ladle with the alloy of the composition proposed, home ferromanganese or sklikomarg, 5% ferrosilicon, seated them under the metal sheath, on the issue in pieces 10-50 mm in diameter. When using an alloy of known composition, copper was additionally introduced into the furnace and nitrated manganese was introduced into the ladle, the aluminum consumption in the experimental and comparative melts of the quiescent steel was 0.8 kg / ton1. no more than 2% and did not use aluminum. In tab. Table 1 shows the chemical composition and melting point of alloys of different composition. Using the alloy of each batch produced ntf 1-2 melting steel. Data on the consumption of alloys of the proposed and known compositions and chemistically 84 vecco fy composition of the steel ladle sample are given in table. 2. Calm steel was siphoned into upward-extending molds with profitable extensions, and semi-calm steel was siphoned down into molds, which were wide downwards. To assess the quality of the steel alloyed with the proposed and known standards, the distribution of alloying elements (manganese, vanadium, nitrogen, and copper) in the bucket volume was investigated by analyzing metal samples taken after filling each pallet. The results of the analysis of metal samples for the content of manganese and vanadium are given in Table 3. The fluctuations of the contents (not more than 0.01-0.02%) and nitrogen (not more than 0.001%) in the metal of the experimental and comparative heats during the steel casting were insignificant. Metal experienced melts rolled into sheets of 16 mm thickness. Studies have shown that when using the alloy of the proposed composition, the properties of heat-treated sheets of different batches are more uniform within the bar of the table. four). Thus, the use of the proposed alloy improves the quality of steel and simplifies its alloying technology by reducing the melting temperature of the alloy and eliminating the need for additional input of copper and nitrated manganese. Table 1

Manganese 30.2 34,451,055.0

6.010.08.0 3.52.015.0

2.16,54,5

6.0

8.0 10.0

62.9

61.5 11.0 8.0

12.0 20.0 1.10.5

2.5

1.0 0.5

Iron25.7 40.0 18.0 16.0

Melting point, ° C

1210 1180 1200 12AO

15

12

ten

Vanadium 0.15 0.07 0.15 Manganese 1.59 0.20 1.48 1.55 Lady 0.22 0.18 0.25 0.28

0.025 0.030 0.016 0.018

Nitrogen

Smelting alloyed with the proposed alloy

1.60

1.62 1.59 1.63

1 0, t30

0.147 0.150 0.149

0.21 1.25 1.23 1.22

92 0.070 0.071 0.070 0.072

Continued table.

13.0 10.0

1320

1320

Table 2

15

18

18.5

18

0.10

0.14

0.14 1.40 1.45 1.50 0.22 0.16 0.24 0.015. 0.023 0.018

Table 3

1.60

1.60 0.150 0.151

1.21

1.20 0.070 0.070

eight

Continuation of table 3

Claims (1)

; ALLOY FOR STEEL ALLOYING, containing manganese, vanadium, silicon, iron, carbon, with a l and ch and yu and s. I mean that, in order to reduce its melting point, increase the uniformity of the distribution of alloying components in steel and simplify the alloying technology, 'he) additionally contains nitrogen and copper in the following ratio of components, weight. Z: Rearganets. 30-55 Vanadium 6-15 : 'Silicon ’0.1-15 Iron 16-40 Carbon 2.M0 Nitrogen 1-6 Copper 0.5-15. 2 β ω s: