SU1454876A1 - Steel - Google Patents

Abstract

The invention relates to the field of metallurgy, in particular to steel for the manufacture of parts subjected to nitriding, working for wear, torsion and bending under dynamic load in an aggressively abrasive environment. The purpose of the invention is to increase the hardness in the nitrided state. The steel additionally contains magnesium in the following ratio, wt.%: Carbon 0,35-0,45; manganese 0.40-0.65; silicon Oh, .17-0.37; chromium 3.9-5.0; nickel 0.1-0.40; molybdenum 0.40-0.90; vanadium 0.25-0.45; aluminum 0.015-0.30; calcium 0.001-0.02; magnesium 0.001-0.01; iron else. The use of steel will increase the operational reliability and service life of the screw downhole motor rotors. 2 tab. W (L

Description

one

The invention relates to metallurgy, in particular to steel, and is intended for use in the manufacture of parts subjected to nitriding and working for wear in an aggressive-abrasive environment, as well as working in torsion and bending under dynamic load, for example, engines for drilling oil and gas svkazin.

g

The aim of the invention is to increase the hardness of steel in the nitrided state.

PRI me R. Under production conditions, the smelting, plastic and heat treatment, nitriding and the study of the nitrided layer of the proposed and known steels are instilled. Casting was done

into ingots with a mass of 100 kg, with subsequent subsequent forging into rods with a diameter of 60 mm. The temperature of the beginning and end of forging is 1100 and respectively. The rods 5 were subjected to quenching with forging heating with air cooling, and then tempering for 620 s, holding for 3 h, and air cooling. Steel samples were subjected to ionic

10 nitriding at 560 s for 24 h.

In tab. 1 shows the chemical composition of the proposed and known steels; in tab. 2 shows hardness

15 nitrated layer at a certain distance from the surface of the samples.

The hardness of the nitrated layer was determined on all samples at a distance from the surface to 0.6 mm through

20 spacing of 0.1 mm.

four

00

but

3иЗ

The use of the proposed steel allows, in comparison with the known steel, to increase the hardness in the nitrided state and to increase the operational reliability and service life of the rotors of screw downhole motors operating in an aggressive-abrasive environment.

Claims (1)

Invention Formula Steel, mainly for nitriding, containing carbon, silicon, manganese, chromium, nickel, molybdenum, is vanadium, aluminum, calcium, iron, characterized in that. b In order to increase the hardness in the nitrated state, it additionally contains magnes in the following ratio, wt.%: s Carbon Manganese Silicon Chromium Nickel Molybdenum Vanadium Aluminum Calcium Magnesium Iron 0.35 - 0, A5 0.40 - 0.65 0.17 - 0.37 3.9 - 5.0 0.1 - 0.40 0.40 - 0.90 0.25 - 0.45 0.015 - 0.300 0.001 - 0.020 0.001 - 0.010 Rest Table 1 The content of ingredients, wt.% Mp Si Cr Ni Mo V Al Sa Proposed 10.45 0.40 0.17 4.3 0.22 0.90 0.31 0.30 0.001 0.001 201, 39 0.59 0.37 5.0 0.40 0.52 0.25 0.015 0, 01 0.006 30, 35 0.65 0.29 3.9 0.10 0.40 0.45 0.09 0.02 0.01 Known 0.42 0.75 0.67 3.5 0.12 0.87 0.56 0.034 0.014 - 0.06 0.015 Depth of nitrated layer, mm Hardness of the nitrated layer, HV, at a distance from the surface, mm Oh that , 1 0,2 0.3 0.4 0.5 0.6 Sa Mg N Fe stop It table 2 , 1 0,2 0.3 0.4 0.5 0.6