SU924155A1 - Austenitic steel - Google Patents

Description

The invention relates to ferrous metallurgy and mechanical engineering and can be used as a wear-resistant material for parts operating under difficult loading conditions, which are characterized by the simultaneous impact on the surface of the parts of high dynamic loads, friction, abrasive. This steel can be used mainly in the cast state.

In terms of technical nature and the achieved effect, the closest to the proposed one is austenitic steel 55Χ5Γ8Λ, containing, wt.%:

Carbon 0.55-0.7 ’

Chrome 4-6

Manganese 6-13

Silicon 0.2-1.5

Iron Else (17

The disadvantages of steel are low wear resistance, toughness, crack resistance and poor processability.

. The chain of the invention is to increase wear resistance, toughness, crack Nostability and improve the manufacturability of steel. .

. To achieve the specified chain drinking austenitic steel containing carbon, iron, manganese, silicon, chromium, additionally contains molybdenum, vanadium, titanium and calcium in the following ratio, wt.%:

Carbon 0.55-0.75

Silicon - 0.2-1.5

Vanadium 0.06-0.15

Manganese 8-13

Molybdenum 0.2-1.0

Calcium 0.005-0.006

Chrome 4-6

Titanium 0.05-0.15

Iron Else

Cast billets for samples of four swimming trunks of known and proposed chemical compositions (Table 1) melted in an open induction furnace with a capacity of 40 kg are quenched in water from 1150 ¾.

924155 4

The results of mechanical tests after deformation by compression by 25% of the weight, phase composition and hardness of the table are given in Table. 2.

Table 1 Melting The content of components, wt.% FROM Np SG And about V L R Sa

Famous

one 0.55 8.86 4.94 Proposed 0.80 0.013 0,026 2 0.55 8.00 4.0 0.2 0.06 0.05 0.20 0.012 0,022 0.005 3 0.63 9.8 4.97 0.34 ’Ο, ι 0.1 .0.72 0.018 0,032 0.005 four 0.75 13.0 6.00 1.00 0.15 0.15 1,50 0,025 0,031 0.006

table 2

Melting Οσ, ί kgf / mm ^? kg / mm <R % g % He + th 'kgcm / cm ^g , 2 kgcm / cm WELL kg / mm The number of s / phase,% one 41.0 48.5 6.0 8.0 . ^4. ° 1,5 3 545 twenty 2 42.0 49.0 ' 8.5 10.5 6.0 3.0 510 7 3 45.5 8.1.5 48.0 4§, 0 25.0 8.5 385 four four 53.5 70.0 31,0 35.0 22.0 11.5 370 one

Resistance to abrasive, contact-impact and crack instability of the proposed and known steels

Table 3

Melting .one------------------- ... Relative abrasion resistance ---. - —— Surface hardening during abrasive wear, n </ n ₀ Resistance to contact-impact loading (number of cycles until cracks appear) Crack resistance number of castings with cracks castings without cracks,% one 1.55 2.00 10 ⁵ one 33 67 ABOUT  1.82 ' 2.05 3.2 10® 12 88 1 ·> o 2.0 5 2,30 10 * 0 one hundred four 1, 90 2.12 10® four 96

The proposed steel has increased thermal stability of steel, which allows it to be used to increase the resistance of castings of crushing and grinding equipment operating at 5 elevated temperatures (armor-lining plates of cement mills are heated by dry method to 300-500 ° C during operation) and slabs of packaged crushers of agpofactories - up to 700-800 ° C). 10

When using the proposed steel for the manufacture of poured crushing and lining plates of 94 parts, molded in three industrial melts, only one part is rejected for the presence of hot, 5 hot cracks and one for the presence of cold.

The results of the operation of the experimental batches of these castings show that their durability under the conditions of impact-abrasive wear is more than 1.5 times higher compared to castings made of steel 55Kh5G8L.

The heat treatment technology of the proposed steel does not change compared to 25 used for steel 55X5G8L.

Claims (1)

Austenitic steel containing carbon, x £ hum, manganese, silicon and iron, * characterized in that, in order to increase wear resistance, toughness, crack resistance and improve processability, it additionally contains molybdenum, vanadium, titanium and calcium in the following ratio of ponents, wt.%: Herperods 0.55-0.75 Silicon 0.20-1.50 Manganese 8-13 Molybdenum 0.2-1.0 Vanadium' 0.06-0.15 Calcium 0.005-0.006 Chromium 4-6 Titanium 0.05-0.15 Iron Rest Information sources,