SU1129265A1 - High-speed steel - Google Patents

Description

with you

It does not refer to the metal content of a fast-mounted high-speed cutting agent following composition,

1 -1.4 4 -b i -1.5 7.5-13 3.5-7

9 -15 0.03-0.08 Else

The disadvantages of this steel are low mechanical properties, as well as a high content of tungsten deficit.

Closest to the proposed technical entity and achieved-, the result is quick-installed 2, of the following composition,.%:

0.95-1.05

Carbon 3.6 --4.2

Chromium

1-2

Tungsten

1.8 -2.4

Vanadium 5.5-6.1

Molybdenum 7.5-8.5

Cobalt 0.08-0.1 Titanium 0.04-0.05 Nitrogen Iron

The rest and impurities

The disadvantages of the known steel are low technological plasticity, red hardness, and low mechanical and cutting properties.

The purpose of the invention is to increase the technological plasticity, red hardness, mechanical and cutting properties.

The goal is achieved by that; that high-speed steel, predominantly sintered, containing carbon, chromium, vanadium, tungsten, molybdenum, cobalt, titanium, iron, additionally contains yttrium and calcium in the following ratio of components wt,%:

Carbon 0.7-1.2

Chrome3,6-4,5

Vanadium 1.1-2.8

0.1-2.0. 6.1-10.0

0.1-8.0 0.03-0.06 0.005-0.01 0.005-0.008 Else

The introduction of yttrium and calcium inhibits the growth of primary grains during primary crystallization during spraying and secondary during quenching, reduces the content of sulfur and oxygen in steel, and contributes to the spheroidization of sulfide inclusions. Yttrium and calcium are introduced into the steel in the form of yttrium aluminum and silicocalcium after the final deacidification of the bath.

The proposed steel is produced by spraying a jet of liquid metal with a stream of energy carrier (nitrogen, argon), followed by hot extrusion of the compacted powder in an evacuated steel shell with a titanium getter, and you get almost non-porous billets,

In Table 1 shows the compositions proposed and. known high-speed steels,

Table 2 shows the technological properties of the steel, Table 3 shows the mechanical properties after quenching and tempering, and Table 2. 4 - operational properties.

As follows from the data presented in Tables 2, 3, and 4, the proposed sintered steel has higher technological plasticity, mechanical properties, red hardness and cutting properties than the known steel.

The proposed steel has, for example, a lower hardness in the annealed condition than is known, which ensures its good weldability and machinability,.

Higher toughness values of steel allow it to be used for the manufacture of metal-cutting tools, working with blows in the processing of difficult-to-cut materials. Steel is well polished.

Table 1

Note. Si, Mn and Ni 4 0.3%; S

10-11 11-10 11-12

9-11

65 66 67

65.5

220

24 22 20

0.5-1.0 240 0.5-1.0 250 0.5-1.0

255

1-5

Table 3

0.38 0.40 0.45

0.25 and P 0.02%; Fe - the rest. table 2

Table 4