Instrumental alloy

 

(57) Abstract:

The invention relates to metallurgy, in particular to the instrumental alloy for the manufacture of cast cutting tool. The essence of the invention: improvement of mechanical properties, heat resistance alloy and durability of a cast cutting tool. The alloy containing manganese, sulfur, silicon, chromium, vanadium, molybdenum, carbon, iron, additionally contains barium in the following ratio, wt.%: the carbon of 0.8 - 2.5, manganese 0.20 to -0,60, silicon 0.20 to 0,65, chrome - 4,00 -8,50, molybdenum 3,50 - 9,00, barium 0,01 -0,12, sulfur 0,02 - 0,15, iron rest, you perform the following relationship: (chrome+mo+1.5 si)of 9.5. table 2.

The invention relates to metallurgy, in particular to the alloys for the manufacture of cast cutting tool.

Known high-speed tool steel HTL (RML) [1] containing, by weight.

Carbon 0,82 0,90

Manganese not over 0.50 to

Silicon is not more than 0,50

Chrome 3,80 4,40

Tungsten 5,50 6,50

Vanadium 1,70 2,10

Nickel not more than 0,50

Sulfur does not exceed 0.025

Phosphorus not more than 0,03

The disadvantage of this alloy is a low impact strength due to the heterogeneity of the structure and high stokesay essence and the achieved result is instrumental alloy [2] containing wt.

Carbon 1,25 2,20

Manganese 0,30 1,80

Silicon 1,40 2,60

Chrome ceiling of 5.60 8,00

Vanadium 4,30 7,60

Molybdenum of 0.10 to 3.50

Aluminum 0,10 0,50

REE 0,02 0,15

Iron rest

The disadvantage of this alloy is that medienakademie castings (for example, in massive castings or when the casting) is a coarse-grained microstructure and the resulting low values of heat resistance, mechanical properties of the alloy and the resistance made out of cast tool.

To improve mechanical properties, heat resistance alloy and durability of a cast cutting tool from it, we offer alloy containing carbon, manganese, silicon, chromium, vanadium, molybdenum, carbon, iron, additionally contains barium and sulfur in the following ratio, wt.

Manganese 0,20 0,60

Silicon 0,20 0,65

Chrome 8,50 4,00

Vanadium 8,50 2,00

Molybdenum 3,50 9,00

Barium 0,01 0,12

Sulfur 0,02 0,15

Carbon 0,8 2,5

Iron rest,

(Cr+Mo+1,5 Si)9,5.

As an impurity in the alloy may contain phosphorus in an amount up to 0.03 wt.

As part of the proposed no need for expensive alloy tungsten alloy Gotovina cutting tool of the proposed alloy can be used castings, is not subjected to hot plastic deformation. The cutting tool from the proposed alloy has a high resistance.

The chemical composition is known and the proposed alloys and their properties are given in table. 1 and 2.

Melting was performed in an open induction furnace the charge, consisting of steel scrap, electrode breakage and ferroalloys.

Billets with dimensions HH mm for cutting incisors were obtained by casting; round rods with a diameter of 60 mm for milling cast in dry form from chromomagnetic. Procurement of samples to determine the impact strength was obtained by casting.

Machining of blanks was carried out after annealing at normal modes for steel R6M5.

Heat treatment of tool included the tempering by heating the salt bath to a temperature of 1180 1225oC and cooling in industrial oil and double tempering at a temperature of 520 540oC.

The heat resistance of the alloy was characterized by the change of hardness of heat-treated samples after 4-hour exposure at a temperature of 610 -620oC and air cooling to room temperature. Per unit adopted by those who cut and the cutting blade made of steel R6M5, which according to the results of the tests were, respectively, 40 and 420 minutes

Sources of information

1. GOST standard 977-88) "Casting steel. General technical requirements".

2. USSR author's certificate N 1330202, class C 22 C 38/24, 1987.

Instrumental alloy containing carbon, manganese, silicon, chromium, vanadium, molybdenum, sulfur, iron, characterized in that it additionally contains barium in the following ratio, wt.

Carbon 0,8 2,5

Manganese 0,20 0,60

Silicon 0,20 0,65

Chrome 8,50 4,00

Vanadium 8,50 2,00

Molybdenum 3,50 9,00

Barium 0,01 0,12

Sulfur 0,02 0,15

Iron Rest

when this is done the following relationship: (chrome + mo + 1.5 si) of 9.5.0

 

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