SU1077947A1 - Die steel - Google Patents

Abstract

STAMPING STEEL, including carbon, silicon, manganese, chromium, niobium, aluminum, vanadium, molybdenum, boron and iron, characterized in that it additionally contains titanium and calcium in the following ratio of components, wt,%: 0.5-0.6 Carbon 0.5-1.5 Silicon 1.0-2.0 Manganese 1.0-3.0 Chrome 0.01-0.06 Niobium 0.015-0.050 Aluminum 0.3-1.5 Vanadium 0.05-0.3 Molybdenum 0.001-0.01 Boron 0.01-0.03 Titanium 0.005-0.05 Calcium Iron Else

Description

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The invention relates to metallurgy, in particular to the composition of tool steels intended for the manufacture of hot stamping dies;

Known stamped steel 5HGM (GOST 5950-73) ij of the following chemical composition, wt.%:

Carbon 0.50v.iO, 60

Manganese 1.20 ... 1.60

Silicon Oh, 25 ... Oh, b5

Chrome Oh, 60 ... Oh, 90

Molybdenum Oh, 15 ... Oh, 30

Iron Else

The disadvantages of steel are low heat resistance, resistance to overheating, hardenability, wear resistance and an increased tendency to temper brittleness.

Closest to the proposed steel by its technical essence and the achieved effect is die steel 2J, content, wt.%:

Carbon 0.35-0.42

Silicon 0.75-0.95

Manganese 0.6-0.8

Chrome 1.2-1.5

Molybdenum 0.2-0.35

Vanadium 0.25-0.4

Bor 0.01-0.003

Niobium 0.02-0.06

Aluminum Up to 0.03

. Iron Else

The disadvantage of steel is low wear resistance.

The purpose of the invention is to create an abrasion resistant steel.

This goal is achieved by the fact that die steel containing carbon silicon, manganese, chromium, niobium, aluminum, vanadium, molybdenum, boron and iron additionally contains titanium and. calcium in the following ratio of components, May.%:

Carbon 0.50-0.60

Silicon 0.5-1.5

Manganese 1.0-2.0

Chrome 1.0-3.0

Niobium 0.01-0.06

Aluminum 0,015-0,050

Vanadium 0.3-1.5

Molybdenum 0.05-0.3

Boron 0.001-0.01

Titanium 0.01-0.03

Calcium 0.005-0.05

Iron Else

The steel may have a residual nitrogen content (0.05-0.005%).

In order to investigate the properties of the proposed steel, pilot melts were cast in an induction furnace. 5 The chemical composition of the cast heats of the proposed steel is given in table.

Ingots weighing 50 kg are forged on a workpiece 75 mm in diameter, from which samples are made for the study of mechanical properties and heat resistance at room and elevated temperatures. The durability tests are carried out on a crank-stamping press with a force of 4000 i.e. when stamping parts5 403-290-4056 / 57.

Samples for mechanical testing are quenched in oil and released in a salt bath.

The heat treatment modes and the test results are presented in Table 2.

The heat resistance of the steel is determined by the temperature of the 4-hour tempering. The results of the study of heat resistance of bone are given in table 3.

In table 4 presents the compositions of the known and proposed steels.

0 Strain steels are melted in an induction furnace. Steel is poured into ingots-electrodes with a section of 230x x230 mm. The ingots-electrodes are remelted on an ESR furnace OKB 1155 B into a mold with a section of 360x360 mm. The ingots are cut into die-cutting cubes with a section of 320x360x360 mm, from which they produce die-cutting tools for part 245-33. After hardening from 93 ° C and 880 ° C and high tempering, stamps from the proposed and famous steel have a hardness on engraving, respectively, cJotH 3.15 and 3.0 mm.

The tests were carried out on a hammer with be-.

5 som of the falling part of 2 tons. On the stamp, from the proposed steel, up to the wear of the engraving, 2700 forgings were made, and on the stamp of known steel - only 2100.

0 The expected economic effect from the use of the proposed steel for the manufacture of hot stamping tools will be 23 rubles. per ton of tool. Room. C M M G G Si I 10.50 1.00.5 20.55 1.51.0 30.60 2.01.3 40.59 2.01.5 50.59 0.9 0.4 60.59 2.1 1.6 Temperature, with tempering tempering tests 870 480 20 400 600 890 480 20 400 600 20 890 480 400 600 Content of elements, wt.% Cr G Mo TV G T1 IB I Nb 1 Al 1 Ca G Fe 1, 00,050,30,01 0, Q01 0,01 0,015 The rest 1,50,151,00,025 0,007 0,025 0,02 0,01 1,80,252,30,03 0,009 0,03 0,03 0,02 3,00,301,50,03 0.01 0.06 0.050 0.05 0.9 0.04 0.2 0.009 0,0009 0.01 0.010 0.004 3.1 0.4 1.6 0.04 0.02 0.07 0.065 0.06 Mechanical characteristics Durability (Зг "8 l SV solid kgf / mm kgf / mm,%% kgf / bone, 137.2 151.1 22.0 36.0 4.1 41.5 3100 98.1 100, 5 26.0 62.0 4.8 78.5 85.3 70.0 75.0 6.9 140.5 155.3 14.0 36.1 4.5 100.2 115.4 28.0 40 , 5 4.9 41.0 3230 79.1 88.4 69.5 73.4 7.6 142.3 156.4 16.0 37.1 4.8 98.1 116.4 32.5 40, 9 5.2 41.0 3150 81.0 90.4 70.2 74.5 7.9 Tables a 1 Table 2 tools, I / cmN

S90 480 20 i42j3 157.4 400 99.9 118.3 600 82.0 95.4

3190 17.1 36.2, 9 41.0 33.5.40.8 5.6 69.3 75.0 8.2

Continued tabl, 2

Claims (1)

STAMP STEEL, including carbon, silicon, manganese, chromium, niobium, aluminum; vanadium, molybdenum, boron and iron, distinguishing- with the fact that, in order to increase wearability she additionally co holds titanium and calcium at the next ratio of components, May.%: Carbon 0.5-0.6 Silicon 0.5-1.5 Manganese 1.0-2.0 Chromium 1.0-3.0- Niobium 0.01-0.06 Aluminum 0.015-0.050 Vanadium 0.3-1.5 Molybdenum 0.05-0.3 Boron 0.001-0.01 Titanium 0.01-0.03 Calcium 0.005-0.05 Iron Rest IN SS ω s >