SU1016393A1 - Steel - Google Patents

Abstract

STEEL, containing carbon, kreyshy, manganese, chromium, molybdenum, vanadium, iron, characterized in that, in order to increase wear resistance, contact strength, cost reduction, it additionally contains nickel, calcium, aluminum, the following ratio of components, weight. % i Coal: genus 0.60-1, g Silicon 0.60-1.2 Manganese. 0.2-0.8 Chromium5.5-6.5 Molybdenum0.3-0.5 Vanadium0.85-2.50 NickelO, 2-1, O Kalsh1y0.002-0.025 Aluminum 0.005-0.05 Nitrogen0.002- 0, IronEverything Else

Description

L

WITH

with

00 The invention relates to metal cladding, in particular, alloyed with l for cold deactivation tools, and can be used in the manufacture of cold rolling rolls. To ensure high operational durability of the rolls, the full steels must have the necessary wear resistance, hardness and satisfactory resistance to treating. Known steel CiJ used for the production of workers or intermediate cold rolling rolls has the following composition, wt.%: Carbon 0.80-0.90 Silicon 0.30 Manganese 0.30 Chromium 4,0 Lybdenum 8.5 Vanadium 1.2 Cobalt 5.0 Tungsten 1.5 IronOstal The disadvantage of this steel is its high cost due to the presence of cobalt, wolfma and the molybdum content in its composition. 6X6M14 I composition, wt.%: Carbon0 , 5-0.64 Silicon, 3-0.5. Manganese 0.4-0.7 Chromium5.5-8 Molybdenum1-2 Vanadium0.3-0.8 Iron Else This steel is used for the production of cold-rolled rolls, for example, for multi-roll Mills Sendzimir. A disadvantage of the known steel is relatively low hardness, wear resistance and contact withstand. In addition, the high content of scarce molybdenum significantly increases its cost. The purpose of the invention is to increase the wear resistance, contact strength and reduce the cost of steel. This goal is achieved by the fact that steel containing carbon, silicon, manganese, chromium, molybdenum, vanadium, iron additionally contains nickel, calcium, aluminum, azo at the following component ratio, wt.% :. Carbon 0.60-1.25 Silicon 0.6-1.2 Manganese 0.2-0-0 Chromium 5.5-6.5 Molybdenum - 0.3-0.5 Vanadium 0.85-2.50 Nickel 0.2-1-1 , 0 Calcium 0.002-0.025 Aluminum 0.005-0.05 Nitro0.002-0.05 Iron Remaining Studies show that the proposed ratio of components is rational to ensure high wear resistance, tempering resistance and contact strength of steel, and consequently, high operational durability of the rolls . . tab. 1 shows the chemical composition of the investigated melts of the proposed steel, in table. 2 - properties of known and proposed steels. The ingots cast from these heats are forged into billets that undergo preliminary heat treatment — isothermal annealing according to the following conditions: heating to bbO-B O C, holding for 2-3 hours, cooling with furnace to 7OO-720 ° C, holding 6 hours and cooling from oven up to 100-150 ° C. After annealing, the Brinell hardness is 220-255 IV. The final heat treatment is carried out: heating up to 1100 ° C, holding for 2 hours, quenching in oil and three times high tempering for 1 hour at 500-530 ° C, after which the strength under static bending and compression, contact endurance and wear resistance of the proposed steel and at the same time, the properties of the well-known steel 6H6M1F, heat-treated according to the same mode as proposed. The test results are shown in Table. 2. Compressive strength is determined on samples of 10x10x15 mm. The speed of movement of the moving head of the machine when testing 2 mm / min. The maximum load of the testing machine is 35 tf. Bending tests were carried out on samples:, 10 mm, length 80 mm, Meledu distance with supports 60 mm. Wear resistance and contact strength are determined on a three-roller testing machine designed by A. M. Puzayova during friction rolling. The diameter of the tested rollers is 30 mm (the width of the track is 5 mm), and the rolling rollers made of ShKh15 or R18 steel are 60 mm (the width of the track 10 VM}. As can be seen in Table 2, the proposed steel has higher hardness, wear resistance and contact strength. Increasing the compressive strength reduces roll splicing and reduces the contact area of the roll with the strip. This will reduce the effort and increase rolling reductions. The annual need for cold rolling poles for a 20-roll rolling mill is 500 rolls. A roll of 6Kh6M1F steel is 380 rubles, and the cost of one alka from the proposed steel is 375 rubles. The cost of making 500 rolls from the proposed steel is 187500 rubles, and the known 190,000 rubles 10,600.60 0.2 5.5 0. 3 20 dO 0.90 0.55 6.0 0.4 31.25 1.20 0.80 6.5 0.5

Improving the mechanical properties and wear resistance of the proposed grinding system allows to increase the operating resistance of the rolls 1.4 times. The annual economic effect is equal to 56071 rubles.

, Table 1 ,

Fe. L, ...: .... L.J.jj..L.iJ ...: i.i. Chemical composition,% 0.85 0.20 0.002 0.005 0.002 Bal. 1.64 0.60 0.012 0.030 0.02 Ost. 2.501.00 0.025 0.05 0.05 Ost.

Claims (1)

STEEL containing carbon, silicon, manganese, chromium, molybdenum, vanadium, iron, characterized in that, in order to increase wear resistance, contact strength, reduce cost, it additionally contains nickel, calcium, aluminum, nitrogen in the following ratio of components, weight. %: Carbon 0.60-1.2? silicon - 0.60-1.2 Manganese . 0.2-0.8 Chromium 5.5-6.5 Molybdenum 0.3-0.5 Vanadium 0.85-2.50 Nickel 0.2-1.0 Calcium 0.002-0.025 Aluminum 0.005-0.05 Nitrogen 0.002-0.05 Iron Rest 1.