SU910830A1 - High-speed steel - Google Patents

Description

(5+) QUICK STEEL STEEL

The invention relates to metallurgy. steels, namely, high speed steels, used to manufacture tools designed for machining special steels with a high strength category. Closest to the proposed invention in technical essence and the achieved effect is fast cutting steel 1, containing weight ...% Carbon 0, aO-0, B5 Chromium, Tungsten 5.5-6.5 Vanadium 1.7-2, 1 Molybdenum 5.0-5.5 Nitrogen 0,, 09 Zirconium 0.11-0.12 Iron Else The disadvantages of the known steel are unsatisfactory cutting properties and wear resistance. The purpose of the invention is to increase the cutting properties and wear resistance. To achieve this goal, carbon cutting steel containing carbon, chromium, tungsten, molybdenum, vanadium, nitrogen, zirconium, iron additionally contains titanium in the following ratio of components, weightD: Carbon 0.98-1.15 Chromium3,8-it, 4 Tungsten 5.5-6.5 Vanadium 1.7-2.2 Molybdenum 5-5.5 Titanium0.2-0, Zirconium 0.1-0.2 Azrt0.06-0.2 Iron Rest Introduction to high-speed steel of titanium and high carbon content and nitrogen allows to significantly increase the content of carbonitrides and cubic titanium carbides, thereby significantly increasing the wear resistance of steel and its cutting properties. Known steel is smelted in an induction furnace.

The compositions of the steels are given in table. t.

To determine the mechanical properties, samples of size 8 X 8 X 80 mm are fabricated, which are processed according to the optimal mode: quenching in oil from a temperature of 1220 ° C and a short tempering time at Zbo.

The results of tests of hardness, red hardness, tensile strength at steel bending for all three compositions of BOB in comparison with the known are given in table. 2

In addition, from these compositions, steels are made cutting inserts of size 8 x 8 x 0 mm and testing the cutting properties of the mining and milling in the cutting laboratory.

The data obtained are given in table. 3 ..

Production tests are also carried out on steels. For this, a batch of end mills {2 19 m and 28 mm are manufactured. The tests are carried out when milling pits in parts of 100, 98 3.8 5.5, 5 1.7 0.20 0.06 0.06 1.1, 05 5.95 5.11 2.05 0, 29 0.15 0.12 1.15, 6.5 5.5 2.2 0.40 0.20 0.20

0.92 4.0 5.9 5.2 1.9

Whether marks with a hardness of 33HRC 0 under the following cutting conditions: speed (V) 11 m / min and 15 m / min, scorch per tooth (S) 0.04 mm / tooth, groove width (D) 28 mm, groove depth ( B. 1 mm, cooling - emulsion.

The criterion for blunting a tool takes a set of technological parameters, such as the roughness of the machined surface, groove shape errors, zero coordinate correction values, etc. After an atupleia, the cutter is removed from the machine and the chamfer width is measured on the back surface of the tooth.

The test results are shown in Table. .

Test data confirm that the cutting properties of the proposed steel significantly (1.5-2.0 times higher than the cutting properties of the known. The mechanical properties, namely hardness and redness, which characterize the wear resistance of steel, are higher in the proposed steel than that of the known.

0.11 0.06

table 2

Table 3

Table k The average number of machined parts, pieces at a speed at a cutting speed of 11 m / min and 15 m / min and a cutter diameter of 28 mm cutters 19 mm i Known 25

9108308

Claims (1)

Claims of the invention - 5 JO 15 20 High-speed steel containing carbon, chromium, tungsten, vanadium, molybdenum, nitrogen, zirconium, iron, characterized in that, in order to improve cutting properties and wear resistance, it additionally contains titanium in the following ratio of components, wt.%: Carbon 0.98-1.15 Chrome3.8-it, i "Tungsten 5.5-6.5 Vanadium 1.7-2.2 Molybdenum - it, 5-5.5 Zirconium 0.1-0 , 2 Nitrogen, 0.06-0.2 Titan, 0.2, Iron. The rest Sources of information taken into account during the examination 1; USSR author's certificate, cl. C 22 C 33/28, 1976.