SU1211332A1 - High-speed steel - Google Patents

Description

I12113322

The invention relates to the field of chemical composition of investigated-metalurgy, in particular to steel for the manufacture of cutting tools. The purpose of the inventions is to increase the wear resistance of high-speed steel.

heats of known and proposed steel and the corresponding properties are given in Table 5. one.

Steel

Content of elements, may.% C Cr W V I Mo I A1

Known

1 0.90 Offered

3.25 6.0 2.25 3.30

but

0,0150,00180,000650,036

0,0200,00200,000700,040

0,1100,00350,001600,065

0,200,00500,002500,090

0,230,00540,002800,120

Steel compositions have exorbitant contents of alloy components.

Introduction to known fast-crystallization, ground grain

Lubricant steel aluminum and titanium ow-offered high-speed steel and

topically with nitrogen, it contributes to the formation of a uniform distribution of large amounts of the nitrile division of the crab phase, which decreases the carbon dioxide and carbonitrides of these elements. The degree of dendritic segregation

The nitrides, which are ready-made centers, increase the technological and ecchemical composition of the research

heats of known and proposed steel and their corresponding properties are given in Table. one.

Table 1

Rest

operational properties of steel. Excess nitrides and ka1) bonitrides inhibit grain growth at high temperatures (during quenching), which makes it possible to obtain more doped martensite and high tool durability. The presence of boron in the proposed steel contributes to an increase in the concentration of tungsten in the solid solution and to an increase in the hardness and heat resistance of steel, which increases tool life. Calcium improves the plastic properties of steel by changing the nature and shape of non-metallic inclusions.

End mills with a diameter of 10 mm are made of the known and proposed steel, which are subjected to heat treatment according to the following mode: hardening, three-time tempering with hardening for 1 hour at 550 C. Hardness after heat treatment of mills 66 HPC. The tests were conducted on an FP-17M milling machine.

{cutting time: speed And 365 rpm; feed S 0.05 mm / tooth. cutting speed, 8 m / min.

 The cutter is cooled by emulsion. The material being processed is ZOHGSA steel, hardness 240 HB. The tests are carried out until the cutter is allowed to blunt or breakage occurs.

The resistance of the tested cutters is given in table 2.

Editor S. Lisin

Compiled by V. Brostrem

Tehred O. Niece Proofreader A.T.

Order 613/33 Circulation 567 Subscription

VNIIPI USSR State Committee

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

Branch PPP Patent, Uzhgorod, st. Design,

table 2

Average speed, min

Relative resistance,%

ten

Known

130

100

15

20

25

As can be seen from Table 2, the durability of mills made from the proposed high speed steel is, on average, 30% higher than the durability of mills made from known high speed steel.

Eco-friendly effect is achieved by increasing tool life.

Claims (1)

RAPID STEEL containing carbon, chromium, tungsten, vanadium, molybdenum and iron, with the fact that, in order to increase wear resistance, it additionally contains aluminum, titanium, boron, calcium and nitrogen at the following ratio of components Comrade, May. 7: Carbon 0.85-0.95 Chromium 3.0-3.5 Tungsten 5.5-6.5 Vanadium 2.0-2.5 Molybdenum 3.0-3.6 Aluminum 0.01-0.10 Titanium 0.02-0.20 Boron 0.002-0.005 Calcium 0.0007-0.0025 Nitrogen 0.04-0.09 Iron Rest F § ta co b f