SU1235986A1 - Tool steel - Google Patents

Description

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The invention relates to the field of metallurgy, in particular to tool steels for the hot treatment of metals.

The aim of the invention is to increase the heat resistance, heat resistance and toughness of the proposed steel.

The chemical composition of the studied bottoms of the proposed and known steels and the corresponding properties are given in Table. 1 and 2.

Samples are poured to investigate the properties and structure of the steels under investigation. Test samples for mechanical properties are made from poured samples.

Strength and ductility are determined on samples with a working diameter of 6 mm and an estimated length of 30 mm, and impact strength on samples of size

2359862

10x10x55 mm with notch type Menage (mm). The degree of resistance is determined on samples with a diameter of 20 mm and a length of 50 mm by repeated heating in

- 5 liquid brass followed by cooling in water to form the first terrace.

The optimum tempering temperature of the proposed steel is chosen from the condition of providing the greatest hardness after quenching in oil and not less than 10 grades of austenite, according to GOST, I020-1040 C with cooling in oil, followed by tempering at a temperature of 675 C and hardness HRC 45 .

The economic effect is achieved by increasing the durability of the tool made of the proposed steel,

Table 1

REM Iron

0.04 0.005 0, W 0.08 0.080.12

X

Ostal-Ostal-Ostal-Os-Os-Os-0noye lower thaltal-thalna oyna oenoy

  Meltings 1 and 6 have a component content leaving

for claimed limits.

Order 3066/27 Circulation 567

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Continued table.

table 2

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Claims (1)

TOOL STEEL containing carbon, silicon, manganese, chromium, tungsten, vanadium, molybdenum, niobium, iron, characterized in that, in order to increase heat resistance, heat resistance and toughness, it additionally contains aluminum, nitrogen, calcium, antimony and rare earth metals in the following ratio, May. %: Carbon 0.37-0.45 Silicon 0.60-0.90 Manganese 0.30-0.70 Chromium 3,50-4,50 Tungsten 2.10-2.60 Vanadium 0.60-0.90 Molybdenum 1.50-1.90 Niobium 0.05-0.15 Aluminum 0.008-0.02 Nitrogen 0.05-0.12 Calcium 0.005-0.08 Antimony 0.05-0.10 Rare earth § metals 0.005-0.10 (/) Iron Rest yu sl f