SU1033568A1 - Steel - Google Patents

Abstract

STEEL, containing carbon, manganese, chromium, silicon, nitrogen, nickel, vanadium, iron, about 1 and 2, so that, with the aim of increasing ductility and toughness, it contains magnesium, Calcium, barium, yttrium and boron at the following ratio of components, wt.%: 0.11 - 0.6O Carbon 18 - 24 Manganese 1O - 14 Chromium O, 05 - 1.5O Silicon O, O5 - O, 60 Nitrogen 1 O, 05 - 2, O Nickel 0, O5 - 3.0 Vanadium O, OO5 - 0.1 Calcium O, OO5 - 0.1 Magnesium Q, OO5 0.1 Yttrium 0, OO5 0.1 Barium 0, OOO5 .. 0.003 Bor Rest Iron

Description

ABOUT

DO CO

No

F

00 1 The invention relates to metallurgists, in particular, to high strength non-magnets, which became used in the mechanical engineering industry for the manufacture of high-loaded adequate parts, strengthened by nitriding and surface-plastic deformation. Known steel 2 13N4G9 l. The disadvantage of steel is low strength and plastic properties. Closest to the invention is C 2 j steel containing components, wt.%: Carbon .0.2-0.4. Chromium 16-18 Nickel .3.5 - 4, S Manganese12 - 16, Nitrogen 0.20 - a, 4 Vanadium1, O - 2.5 Serrado 0.03 Phosphorus. Up to 0, O5 Silicon Up to 1 Iron Else Providing considerable strength, steel of D9NOGY composition has low ductility and toughness, which limits its applicability. In addition, the large workpieces of this steel are difficult to forge and stamp, and as a result, the yield of good metal after hot transfer is reduced. One of the main disadvantages of this steel grade is the presence of a coarse-grained structure in forgings, significant variations in grain sizes from 0th to 4th grades of GOST 5639-65 grade are noted, which impairs viscosity characteristics, makes ultrasonic testing difficult and eliminates the possibility of chemical heat treatment, in particular nitriding. The presence of steel up to 4.5% of such a deficient element as nickel is also undesirable. The aim of the invention is to improve the ductility and toughness of steel. This goal is achieved by the fact that steel containing carbon, manganese, chromium, silicon, nitrogen, nickel, vanadium, iron additionally contains magnesium, calcium barium, yttrium and boron at the next component ratio, wt.%: Carbon 0.11 - 0.60 Manganese .18-24 Chrome 10-14 Silicon 0.05 - 1.5 O Azot 0.05 - 0.60 Nickel 0.05 - 2.0 68 0.05 - 3.0 Vanadium O, OO5 - O, 1 Calcium 0, OO5 - 0.1 Magnesium 0.005 - 0.1 Yttrium O, O05 - O, 1 O, OOO5 - 0, OOZ Else Iron Steel contains impurities, wt.%: Sulfur, OO05 - 0.01 Phosphorus O, O05 - OOZ Magnesium, calcium, barium, yttrium are introduced into the steel, which increase the ductility at hotter than the redistribution, and consequently, the yield of a suitable metal after forging and stamping operations, as well as boron for grinding austenite grain, besides, the nickel content in the steel is reduced to 0.05-2%. The combination of 10-14% chromium with 18-24% manganese provides a stable austenitic structure with magnetic permeability (U41.00 G / E, and the presence of carbon, nitrogen and vanadium provide high mechanical properties. To obtain the proposed steel grades 25 13G20AF1 and The known steel grade 25 17Г15Н4АФ2 was manufactured at the plant. Ingots weighing 25 kg were forged into rods with a diameter (16 mm and 16–16 mm squares. The chemical composition of the steel is given in Table 1. Heat treatment was carried out in 16 16O mm billets and 16 16 squares mm to st whether 25 "13Г20АФ1 heats 1 - 3 according to the austenitization regime at 1170 ° С with subsequent aging at 620 ° С for 20 h. Steel billets 17G15N4AF2 were heat treated according to the austenization regime at 1170 ° С with cooling in water and aging at 650 C for 1O hours. The mechanical properties of the steels after heat treatment are given in Table 2. After this heat treatment, the magnetic permeability of all investigated melts is 1, 01 Gs / E. The ductility characteristics of steel 25 13Г20АФ1 at elevated temperatures in comparison with steel 25 17Г15Н4АФ2 are given in table. 3. Magnetic permeability of all samples after thermal treatment with JU. 11.00 gs / e. Nitriding of samples 3–103 with dimensions 10 10 30 from steel 25 13Г20АФ1 was carried out at 650 ° С for 30 h in ammonia medium diluted with nitrogen. The depth of the nitrated layer is 0.20-0.24 mm, and the hardness measured on the Vickers device with a load of 10 kg is H Q 87 O - 92 O. Steel has a stable austenitic

condition with all types of heat and mechanical treatments. The austenitic grain is small, not larger than 7 points of the GOST 5639/65 scale, which allows the use of the proposed steel at the Zvezda construction plant to provide savings of approximately 1,00. rub. in year,

ITALYA 1 33684 to use it to obtain large forgings and to subject it to nitriding. The proposed steel 25 13G2OA 51 i satisfies the requirements imposed on strength-resistant, non-magnetic and can be used in the manufacture of critical, heavily-loaded diesel engines. .

10.11 18 1O 25H13G2OAF1 20.24 18.5 13.2 30.60 2414

25H17G15NCHAF2 4 O, 25 17 0, OO5 0.1O 0, OO5 0, OO5 25H13G2OAF1 0.05 0, O4 0, OZ O, O5 OjlO 0, OO5 0.10 O, 1O

.25Х17Г15НЧАРФ2

Oh 25 1.6

18 O, 15 4, O

The rest O, O5 0.05 O, 6O O, ZO 0.24 1.68 O, 19 1.54 1.50 2, OO, 05 O, 05 O.OZ O, OO5 O, OO2 Noe (OO1 0, OO5 0, OO2 then w 0, OOO5 O, OO5 - Note.

T and l and c and 2 In tab. 2 shows the average values of the results of the tested 5 samples ;, Table 3

Claims (1)

STEEL containing carbon, manganese, chromium, silicon, nitrogen, nickel, vanadium, iron, distinguishing -. with the fact that, in order to increase ductility and viscosity, it additionally contains magnesium, calcium, barium, yttrium and boron in the following, ratio of components, wt.%: Carbon 0.11 - 0.60 Manganese. 18-24 Chromium 10-14 Silicon 0.05 - 1.50 Nitrogen 0.05 - 0.60 Nickel ] 0.05 - 2.0 Vanadium 0.05 - 3.0 Calcium 0.005 - 0.1 Magnesium 0.005 - 0.1 Yttrium 0.005 - 0.1 Barium 0.005 - 0.1 S Boron 0.0005- 0.003 Iron Rest ω Cz g- О СО СО sl σ> □ о> 1 1033568