SU1161578A1 - Tool steel - Google Patents

Abstract

TOOL STEEL containing carbon, silicon, manganese, chromium, vanadium, copper and iron, o. similar to that. in order to increase heat resistance and wear resistance, it additionally contains nickel, titanium, molybdenum, zirconium, boron in the following ratio of components, wt.%: 0.51 - 0.70 Carbon 0.3 - 0.5 Silicon 0, .7 - 0 , 9 Manganese 3-4 Chromium 0.8 - 1.2 Vanadium 0.35 - 0.70 Copper 0.4 - 0.6 Nickel 0.5 - 0.7 Titanium 0.2 - 0.5 Molybdenum 0.01 - 0.02 Zirconium 0.002 - 0.005 Boron El Rest Iron (L

Description

but

ate

00 The invention relates to the field of metallurgy, in particular to tool steels, used for molds to cast under pressure aluminum alloys on hot cell machines. It is known to use molds for die-cast aluminum alloys of tool steel mark ZX2VaF 1, However, such steel is considered to be ficient and expensive, since it is alloyed with a considerable amount of tungsten and molybdenum. Closest to the proposed steel by its technical essence and the achieved effect is tool steel J of composition, wt.% Carbon 0.51 - 0.67 Manganese 0.18 - 0.42 Silicon 0.6 - 0.9 Chrome 2.1-2.82 Vanadium 0.25-0.55 Copper 0.35 - 0.7 Cerium 0.04 - 0.00 Iron Remaining A disadvantage of the known steel is its reduced heat resistance, which limits its use for. tooling hot deformation, in particular for molds cast under pressure. The aim of the invention is to increase the heat resistance and wear resistance of steel. The goal is achieved by the fact that instrumental steel containing carbon, silicon, argon chrome, vanadium, copper and iron, additionally contains nickel, titanium, but libden, zirconium, boron in the following ratio, wt.%: Carbon 0.51 - 0.7 Silicon0.3 - 0.5 Manganese 0.7-0.9 Chrome3-4 Vanadium. 0.8-1.2 Nickel0.4 - 0.6 Titanium0.5 - 0.7 Molybdenum0.2 - 0.5 Copper0.36 - 0.7 Zirconium 0.01 - 0.02 78 Bor0.002 - 0.025 IronOstal The chemical composition of the investigated melts of the proposed and known steels is given in table. 1. The proposed steel after heat treatment according to the mode: quenching from temperatures of 1080-1100 ° С to oil, tempering at a temperature of 560 ° С for 2 hours, has the following mechanical properties (Table 2). The determination of the heat resistance of the experimental steel melts No. 1915 and 1920 and the known steel is carried out. After heat treatment according to the mode: heating for quenching at 1100 ° C, cooling in oil, tempering at 560 ° C for 2 h, the test samples are subjected to additional 4-hour tempering at a temperature leading to a decrease in hardness to HRC 40, Test results wear resistance of the known and proposed steels are presented in table. 3. According to the test results, heat resistance of melting steel No. 1915 (HRC 40) amounts to steel of melting No. 1920-645 ° C, and known steel - 600 ° C. The wear resistance of the proposed steel is 18% higher than the wear resistance known (Table 3). For a qualitative assessment of the resistance of steel to abrasive wear, the indicator N (mg) is taken as the inverse of the mass wear of the sample. Well / 2. 10 And (256th, 11E, „) - energy intensity of steel in the annealed condition; -hardness of steel after heat treatment; Energy intensity E is determined by the dependency, Q - 6 (0.84U-I, 6, 04uz), (MPa. Where 6g V is the tensile strength vf - relative narrowing .. Economic effect is achieved by increasing the durability of the molds. Steel C SL Mp Cr

but

0.51

0.30 0.44

0.54 O ,, 70 0.50

0.53 p, 75

------- - "- -". "".

Content of components, wt%

Steel

Tl

Mo Si V Se

0.50

0.20 0.350.010.012

0.64

0.44 0.490.020.005 0.70

0.50 0.70. 0.020.005

Note. Fa- the rest Contents

3.00 0.40 0.80 3.18 0.47 1.02 4.00 0.60 1.20

2.40

0.45

(Continuation of table 1

0.50

0,004

Table 2 Table 1 component wt,% Ni

Offered

one

2

3 Known

42-45

10.0 42-45 9.5 42-45 7.8

Claims (1)

<claim-text> TOOL STEEL, </ claim-text> </ td> <td> <claim-text> Molybdenum </ claim-text> </ td> <td> <claim-text> 0.2 - 0.5 </ claim-text> </ td> <td> </ td> </ tr> <tr> <td> <claim-text> containing carbon, silicon, marg - </ claim-text> </ td> <td> <claim-text> Zirconium </ claim-text> </ td> <td> <claim-text> 0.01. - 0.02 </ claim-text> </ td> <td> </ td> </ tr> <tr> <td> <claim-text> hell, chrome, vanadium, copper and iron, </ claim-text> </ td> <td> <claim-text> Bor </ claim-text> </ td> <td> <claim-text> 0.002 - 0.005 </ claim-text> </ td> <td> <claim-text> 5 </ claim-text> </ td> </ tr> <tr> <td> <claim-text> o. The difference is that, </ claim-text> </ td> <td> <claim-text> Iron </ claim-text> </ td> <td> <claim-text> Else </ claim-text> </ td> <td> <claim-text> ID </ claim-text> </ td> </ tr> <tr> <td> </ td> <td> </ td> <td> </ td> <td> <claim-text> 6 = </ claim-text> </ td> </ tr> </ table> <claim-text> 05 </ claim-text> <claim-text> SP </ claim-text> <claim-text> m </ claim-text> <claim-text> 00 </ claim-text> <claim-text> 461578 </ claim-text>