SU810846A1 - Iron-based alloy - Google Patents

Description

The components taken in the following wear, weight. %:

Carbon1,6-2,4

Molybdenum 0.8-3.5

Chrome8.1-9.5

Vanadium6.0-7.8

Silicon1,6-3,2

Manganese 0.4-2.0

IronErest

Sulfur (up to 0.05 wt.%) And phosphorus (up to 0.1 wt.%) May be present as impurities in the alloy. The chemical composition and mechanical properties are given in table. 1 and 2.

Table 1

All melts of the indicated chemical composition were carried out in open induction furnaces in main crucibles on steel scrap metal. The liquid metal was cast into wet sandy-clay forms. Cast billets had the shape of a cross section of 22 X X14 mm, 18X18 mm, and a length of 125 mm.

After removing the gating system, the rods were annealed according to the mode, heated to 900–950 ° C with an exposure time of 2–2.5 h, cooled with a furnace to 600 ° C, and finally cooled to room temperature in calm air. After annealing, the hardness is not more than HB 300.

The blanks were processed by planing up to the shape of individual straight through right incisors with dimensions of 20X12X120 mm and 16x X16X80 mm, and the heads of the incisors were milled to a given geometry. The prepared cutters were subjected to heat treatment according to the following conditions: hardening from 1150-1170 ° С in industrial oil; single vacation at 500-560 ° C for one hour.

Strength and toughness are given for alloys in the annealed condition.

table 2

The test results of cast cutters of these alloys in comparison with the cutters made of high-speed steel R18 and R6M5 are given in table. 3, 4.

Table 3

The operation time of the cutters before regrinding, min, at cutting speed, m / min

room

Claims (2)

Claim The cutters were tested when turning blanks of steel 45 with a feed of 0.13 mm / rev., A cutting depth of 0.25 mm and cutting speeds of 20 and 60 m / min without the use of cooling fluid. Cutters from alloy No. 4 (see table. No. 1) were also tested in comparison with cutters from high-speed steels P6M.5 and P12K9 (table 3). The tests were carried out on a 1A240-6 six-spindle automatic machine in the manufacture of a special bolt from a calibrated hexagon (steel 40X) with a turnkey size of 30 mm. It can be seen from the above data that the resistance of cast alloy cutters from the described alloy when cutting steel 45 is at the level of steel P18 at high cutting speeds (about 60 m / min) and is 10-15% inferior to it at low speeds of 50 (~ 20 m / min). When cutting 40x steel, the resistance of cutters from the described alloy is at the level of high-speed steel P6M5 and is 82–86% of the resistance of cutters from steel P12K9. 55 Billets from the described alloy are satisfactorily processed by cutting, have a lower heating temperature 1. An alloy based on iron containing carbon, molybdenum, chromium, vanadium, silicon and manganese, characterized in that, in order to reduce the cost of the alloy while maintaining high high-speed properties, it contains components in the following ratio, weight. %: Carbon 1.6-2.4 Molybdenum 0.8-3.5 Chrome. 8.1-9.5 Vanadium 6.0-7.8 Silicon 1.6-3.2 Manganese 0.4-2.0 Iron Rest 2. An alloy based on iron, characterized in that the content of vanadium and carbon satisfies a ratio of% 2.5 + 2.1 ·% C.