SU711151A1 - Steel - Google Patents

Description

(54) STEEL

Table 1

Impurities: S 0.025, P 0.025, N1 0.4

From the smelted steel cast ingots, forged on the workpiece. Forging is carried out in the temperature range of 1150-850 ° C. Forgings are forged without tears and cracks in the whole forging interval. The billets are subjected to pasteurization annealing according to the following conditions: heating to 850-870 ° C, holding for 3 hours, cooling with a furnace to 650-670 ° C, vyderzhka b h and cooling with a furnace to 100-150 ° C After annealing, the Brinell hardness is. 195-220 kgf / mm2.

Then the forgings are finally heat-treated according to the mode: heating up to 1150 ° С, holding 2 h, quenching in oil, high meager release for 1 h at 520 ° С.

In tab. Figure 2 shows the comparative test data for determining the flexural strength, the tensile strength for compression and toughness of known and proposed steel.

table 2

1.8

200

Known

270

Pe i izna

The flexural strength limit was determined on a CD-10 machine, tests were carried out on specimens with a diameter of 10 mm, Q 80 mm long, the distance between the supports 60 mm, and compressive strength on specimens 10 mm in diameter and 15 mm long. The speed of movement of the movable machine head during testing

2 mm per minute The maximum load of the testing machine T5 TC.

The impact strength tests were conducted on 10x10x55 samples without being cut.

The hot hardness of steels is determined on specimens heated to test temperatures (holding at these temperatures for 15 minutes), with a short-term load applied for 15 seconds. The test results are shown in Table. 3

Table 3

455.

460

465

465

650

449

455

462

365

290

290

295

285

750 155

-L651.e.5

160

Tests on the height are carried out by heating and rapid cooling of the samples (5-20 mm and a length of 45 1 at the HDTV installation. The steel under study for resistance to the formation of high cracks is at the level of the prototype.

In tab. 4 shows the test data on heat resistance of the proposed and known steel after quenching to 1150 ° C.

Table 4

Continued, 4

560

53.0

53.5 52.7 580

52.0 600 51.7

50.5

54.0 54.0 500 54.7 520

55.5

55.5 55.0 540 560

52.0 54.0 580 53.7

53.5 600

51.5 53.0 500 56.2

55.3 56.0 520

54.5 55.0 540

54.0 54.7 560

54.5 580 54.0

54.0 600 52.0

51.0 5-00 51, 0

49.5

known 520 54.0

54.0 50.0

53.5 540 52.0 560

53.5

Continuation of table 4

580 53.0 51.0 50.5

600

42

40

Predvagaema steel compared

10 with the known allows to increase the operational durability of the rolls by increasing the heat resistance and heat resistance. In addition, the production of the proposed steel is cheaper,

15 because it does not include expensive and scarce metals. The annual economic effect from the introduction of the proposed steel will be 220 thousand rubles.

Claims (1)

Invention Formula 20 Steel containing carbon, silicon, manganese, chromium, molybdenum, vanadium, iron, characterized in that, in order to improve heat resistance and processability, 25 it additionally contains cerium, calcium and boron in the following ratio of components,%: -0.65 Carbon, 5 0.25 -0.55 Silicon 30 0.7 -1.0 Manganese -3.5 Chrome 2.5 Molybdenum1,2 -1,5 -0,8 Vanadium 0.6 0.002-0.004 Bor 0.001-0.05 35 Cerium Calcium0,002-0,05 Iron and impurities Rest Sources of information taken into account during the examination 1. USSR author's certificate 40  345227, class C 22 C 38/24, 1969.