SU761597A1 - High-speed steel - Google Patents

Description

The invention relates to the field of metallurgy, in particular to high-speed steels, intended for machining high-strength steels and alloys, as well as other hard-to-machine materials at elevated cutting speeds. Closest to the proposed technical essence and the achieved effect is high-speed steel [1 ^ the following chemical composition "wt.%:

ten

Carbon

Chromium

Tungsten

Molybdenum

Vanadium

Cobalt

Nitrogen

Titanium

Boron

Lanthanum

Iron

0.95-1.05

3.8-4,4

5.5-6.0

4.6-5.2

1.8- 2.4

7.5-8.5

0.03-0.07

0.02-0.1

0.001-0.003

0.001-0.003

Rest

15

20

This steel has the following mechanical properties:

2

Hardness, SND 65-68

Red hardness

at 640 ° С, 4 h, НЕС 58-59

Tensile strength

with bending, kg / mm® · 280-320

Impact strength, kgm / cm ² "'· 2-3

Famous steel, has good

mechanical properties, has relatively low cutting properties, contains significant quantities of expensive and scarce elements of tungsten and cobalt, as well as lanthanum, all this makes it less promising for widespread introduction into the industry.

The purpose of the invention is to increase the resistance when cutting.

_ζ To achieve the indicated ¹ , the proposed steel additionally contains manganese in the following ratio of components, wt.%:

Carbon 1.6-3.0

Manganese 1-2.5

Chrome 2.8-3.4

3 761397 · 4

Vanadium 2.6-3.2

Molybdenum 2.6-3.2 Titanium '3.0-6.0

Nitrogen 0.1-0.3

Bor 0.05-0.26

'' Iron '. "^. ·'"··; ·· Else

Additional manganese addition

with an increased content of carbon, vanadium, titanium, nitrogen and boron and a reduced content of chromium and molybdenum, they lead to a significant increase in wear resistance and cutting properties, to an improvement in the foundry properties and reduction of the mechanical and operational characteristics.

Offered steel after heat treatment according to the mode: hardening ό;

temperatures 1240 ° - 1280'C; the subsequent three-time tempering at 560 C has the following mechanical properties:

1 Hardness, NCS 63-65

Red hardness

at 600 ° C, 4 h, NCM 60-61

Tensile strength

with bending, hg / mm ^and 180

¹⁰ impact strength

kgm / cm® '. '.0,8-1,0

Steel is well welded.

Smelting technology proposed

high-speed steel does not change by 15 compared to used for Known <·. ' : 'steels.''\ ··

The chemical composition and properties of the proposed SCTs are presented in the table,

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Claims (1)

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