SU711159A1 - Instrumental steel - Google Patents

Description

TOOL STEEL

(54)

The invention relates to the metal of tool steels, and to them but high-speed steels of moderate heat resistance, used to prepare a universal cutting tool. Known instrumental steel 11, containing, wt.%: 1.05-1.50 Carbon 4.0-5.0 Tungsten 0.05-2.0 TO 0.5 Lead 6.05-6.95 Moth; 5den 2 , 16-4.5 Vanadium up to 4.0 Niobium 0.11-0.25 Rest of Iron Iron Known steel has lowered technological ductility and holding properties, which leads to poor wear resistance. The aim of the invention is the improvement of plasticity and cutting tools made of steel. This goal is achieved by the fact that the proposed steel additionally holds selenium, cerium and calcium in the following component ratio, weight. %: 0.80-0.88 Carbon 3.8-4.4 5.5-6.5 Tungsten 5.0-5.5 Molybdenum 1.7-2.1 Vanadium 0.04-0.7 O, 11-0 / 25 0.15-0.20 0.30-0.5 0.020-0.025 Calcium Iron Else To obtain the proposed steel, the composition of steel containing,%: Carbon0.85 Chromium 4.2 Tungsten. 6.3 Sulfur0.3 Molybdenum5.2 Vanadium1.9 Nitrogen0.12 IronErestal A part of the indicated composition was used to prepare a batch of samples according to Tu 1524-42; batch of continuous cut batch of single-tooth cutters. The remaining part is sequentially alloyed with en, cerium and calcium, and from each steel composition, batches of samples are prepared according to GOST 1524-42, a batch of through cutters and single-tooth cutters,

Testing is carried out to determine the mechanical and cutting properties of tools made of steel with different selenium, cerium and calcium contents.

The toughness characteristics are determined on a man-made scraper. The test results are shown in Table. one.

Table

5.6

0.01

5.7

0., 05 0.15

In addition, the cutting properties of tools made from known and proposed steel are tested. V Note t S -

Continuation of table 1

As can be seen from the data in the table, the impact strength of the proposed tool steel is higher than the impact strength of the known steel.

Conduct testing of test steel products on bending on an IM-CHA machine. The test results are given in table. 2

table 2

when processing steel 40KhNML and ductile iron K4-28-36, the test results are shown in Table. 3

Claims (1)

Table cutting speed, m / min; depth of cut, mm; feed per revolution, mm / rev; mm / tooth. Introduction of selenium steel contributes to the grinding of austenite grains, lowering the quenching temperature and dramatically improving the redness of steel. Cerium and calcium eliminate the embrittlement intergranular heterophase-5 made from the proposed cutting tool steel. The presence of sulfur to 0.3 wt.% In steel improves its grindability, machinability and increases wear resistance. Verification of the technological properties of the proposed steel showed good grindability and high finishing ability. Using the proposed steel for the manufacture of high-speed tools allows you to increase the cutting speed by 1.5 times. The proposed steel is expediently used for the manufacture of tools intended for the treatment of structural materials of increased strength. The technology of smelting, forging and heat treatment of the proposed steel and the technology for the manufacture of cutting tools from it do not change as compared with the known steel.25 The invention of instrumental steel containing carbon In order to increase technological plasticity and cutting properties, it additionally contains selenium, cerium and calcium in the following ratio of components, wt.%: Carbon 0.80-0.88 Chromium 3.8-4.4 Tungsten 5.5-6 , 5 Vanadium. 1.7-2.1. Molybdenum 5.0-5.5 Nitrogen 0.11-0.25 Sulfur. 0.04-0.7 Selenium 0.15-0.20 Cerium 0.30-0.50 Calcium 0.02-0.025 Iron Else Sources of information taken into account during the examination 1. French patent 2170654, cl. C 22 C 39/00, 1970.