SU1395689A1 - Die steel - Google Patents

Abstract

The invention relates to the field of ferrous metallurgy, in particular, to compositions of high-strength cast steel for making molds of dies used in the deformation of aluminum alloys. additionally contains strontium in the following ratio of components, wt% „: carbon 0.46–0.52 silicon 0.18–0.42 i Marganane C 0.45–0.80; chromium 0.52-1.12; molybdenum 0.36-0.961- nickel l, 20-l, 70j vanadium 0.10-0.16; aluminum 0.06-0.12 titanium 0.06-0.12; boron 0.0007-0.0016; strontium 0, OOS - 0.0096; iron - the rest, provided that the content of titanium, vanadium, boron and strontium corresponds to the ratio (Ti + V) / B 175-228, Sr / B 1-6, and; a higher value of the ratio (Ti + V) / B corresponds to a smaller value of the ratio - Sr / B and vice versa, 3 tabl. (O (L

Description

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The invention relates to metallurgy, in particular, to the composition of high-direct cast steel for the manufacture of forming dies used in the deformation of aluminum alloys.

The aim of the invention is to increase the hardenability, heat resistance, endurance limit in the cast state.

The chemical composition of the bottoms is given in tabLo1 o

The properties of the steels were determined on specimens cut from the surface and from the central zone of the ingots, size 200200-300 mm, obtained by the ESHO method. quenching time from 950 ° C for samples cut from the central zone, simulated cooling rate for the center of the billet with a cross section of 600-600 mm, and samples cut from the surface were cooled in oil. Tempering temperature 600 ° C. on tempering temperature by hardness up to hardness 40 HRC (). Tensile strength (G was determined on standard shortened specimens. Endurance was assessed by the ultimate strength (G,) during bending tests with torsion of smooth specimens with a cycle base of

The test results are shown in the scoreboard.

Cast steel dies with sizes 600-600-720 mm for the

povaki details like lever aluminum D1

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five

The durability of cast dies is given in tabLoZo.

According to the results of production tests, the total removal of blanks from dies made from the proposed steel increased by 37% o

Claims (1)

Invention Formula Pressed steel containing carbon, silicon, manganese, chromium, molybdenum, nickel, vanadium, titanium, boron and 5 iron, characterized in that, in order to increase hardenability, heat resistance, endurance strength in the cast state, it additionally contains strontium in the following ratio of components, maSo 0 0 five 0 Carbon Silicon Manganese Chromium Molybdenum Nickel Vanadium Aluminum Titanium Thief Strontium 0.46-0.52 0.18-0.42 0.45-0.80 0.52-1.12 0.36-0.96 1.20-1.70 0.10-0.16 0 , 06-0.12 0.06-0.12 0.0007-0.0016 0.0007-0.0096 Else Iron with the proviso that the content of titanium, vanadium, boron and strontium corresponds to the ratio of (Titanium + Vanadium): Bor, 175-228; Strontium: Bor equal to 1-6, the higher value of the ratio Titan + Vanadium: Bor corresponds to a lower value of the ratio Strontium: Bor and vice versa t a b l and n a i Element content, May, Steel С Г Si У ИП Т Сг Г But I N1 Г V I А1 Г Т1. T B J Sr H Fe Prvdp gaem I 0,46 0,42 0,45 0,52 0,36 1,70 0,16 0,060 0,12 0,0016 0,0096 Ostaliyo 20.49 0.27 0.61 1.05 0, L5 1.26 0.12 6.072 0.09 0.0010 0.0050, 52 0.18 0.80), 12 0.96 1.20 0, 10 0.120 0.06 0.0007 0.0007 - Ma astna 4 0,54 0,44 0,71 0,80 0,24 1,46 0,22 0,200 0,01 0,0030 - The content of sulfur and phosphorus in all melts is not more than 0,025. Known steel () dottstvlns contains 0.5 copper, 0.02 x zirconium and 0.14 x nitrogen. Note In the numerator are given. Properties after quenching. The cooling surface modeling, in the denominator - the centers of the workpiece with a cross section of 600-600 mm. Table3 4.5, 5 Table 2 4.0 3.0 3.5 1.5