SU1254051A1 - Steel composition - Google Patents

Description

This invention relates to ferrous metallurgy, in particular to steel compositions for manufacturing. sheets, strips and varietal profiles of the application of the predominantly in heat-treated state.

The aim of the invention is to boost Shock; viscosity

On the table. t and 2 shows the composition of the steel, mechanical properties and wear resistance of the proposed and known methods.

Surging of toughness is achieved by increasing the silicon content and the additional introduction of calcium and barium.

Silicon in the proposed range provides high resistance to steel tempering and high wear resistance due to solid solution mortar. within these limits, it provides an increase in the viscosity of hot-melted stitsti due to nemenevi nonmetallic inclusions and reduced gem content, oxygen in steel, and also contributes to improving the quality of the rolled surface, Eariy improves the level of calcium absorption

Steel is drawn out in a 1-furnace furnace with a base lining. As a charge, there are 88 tons; ally, steel with a carbon content of 0., 10– 0.32%. After adjusting the carbon content to the required composition, carbon, manganese, and it were liquefied in the furnace

The proposed t is 0.20 0.70 0,, 90 0.01 0.01 0.001 0.0005 0.005 Else

2 3

4 5

Famous

0,251,141J70,03 0,020,01 0,00100,012 Also

0.301.501.400.05 0.050.02 0.0050.02, 240.851.10.025 0.030.0028 0.003 .0,0006, 251.451.120.03 O., 030.003 0.0220.023, 220.631.110.03 0.280.003 - - Aluminum in the amount of 0.5- 1.5 kg / t of steel and titanium in the form of 33% ferrotitane in the amount of 0.5-1.2 kg / t of steel. Boron was injected into the deoxidized steel in

as 7.7% ferroboron in the amount of 80- 850 g / t. At a temperature of leOO-ISIO C, the steel was introduced into the ladle, calcium and barium were introduced in the form of a ferrosilicobarium alloy containing 16% barium and

13% calcium.

Steel poured into bars weighing 50 kg. The ingots were heated in a gae furnace up to 1200-125 ° C and rolled on the mill into strips 40 mm thick. Preparations 40 «100 200 mm were quenched in water from temperature and tempering at 200 ° С for 1 h. The friction and wear tests were carried out on pairs of friction roller-block friction. The block was made of the proposed and famous steel, the roller of heat-treated steel 35HGSA. Ie steel became a connecting chain link, located in

contact with the side grill of the coal scraper conveyor. The hardness of the roller is 44-47 HRC, the sliding speed is 1 m / s, the specific load is 1 ffia.

Steel may contain in its composition phosphorus in an amount of not more than O, 1%, a mouse to - no more than O, 15%, sulfur - no more than 0.05%.

HpeflAaraeivfaH steel in comparison 1s

known for its enhanced toughness.

Table 1

is eating-

37-38 41-43 48-49 38-39 43-44

1270-1290 1435-1470 1560-1580 1300-1320

"

1460-1490

1070-1090 1170-1180 1300-1340 1100-1130 1210-1250

630-710 600-640 510-550 420-440 480-500

37-39 1280-1320 1080-1100 340-380

Editor L. Povha

Compiled by V. Muraviev

Tehred M. Khodanich Proofreader E. Sirohman

Order 4690/31 Circulation 567 Subscription

VNIITSH State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raupska nab. 4/5

Production and printing company, Uzhgorod, st. Project, 4

table 2

1090 1180 1340 1130 1250

630-710 600-640 510-550 420-440 480-500

1100 340-380

0.98 1.11 1.23 1.02 1.04

1.0

Claims (1)

STEEL containing carbon, silicon, manganese, titanium, aluminum, boron and iron, characterized in that, in order to increase the toughness, it additionally contains calcium and barium in the following ratio, wt. X: Carbon 0.20-0.30 Silicon 0.90-1.40 Manganese 0.70-1.50 Titanium 0.01-0.05 Aluminum 0.01-0.05 Boron 0.0005-0.005 Calcium 0.005-0.02 Barium 0.001-0.02 g Iron Rest (D with tut *>