SU1121313A1 - Cast iron - Google Patents

Abstract

CAST IRON containing carbon, silicon, manganese, antimony, vanadium, molybdenum, aluminum, nickel and iron. characterized in that, in order to increase the strength of the weld, reduce the cost of cast iron while maintaining the level of its mechanical properties, it additionally contains barium in the following ratio of components, May. %: 3.0-3.4 Carbon 1.6-2.2 Silicon 0.005-0.400 Manganese 0.08-0.12 Antimony 0.15-0.45 Vanadium 0.1-0.4 Malibden 0.2- 2.0 Aluminum 0.1-1.0 Nickel 0.005-0.030 Barium Rest Iron (/)

Description

1 The invention relates to meta- gurgy, in particular, to the development of a composition of cast iron for the repair of casting defects in castings by the method of electric welding. Known cast iron lj, containing, May. %: Carbon 3.0-3.4 Silicon1.6-2.2 Manganese 0.005-0.040 Sulfur0.1-0.2 Antimony 0.05-0.20 Vanadium 0.15-0.45 Iron Else Known cast iron has Its composition includes stabilization of the carbide phase and alloying structural components of the materials, which leads to satisfactory mechanical properties of the pig iron. However, in the production of structurally complex castings from known iron, the repair of technological defects by welding is impossible due to the fact that the alloy is chiselled to chill out in the thermal zone. The closest to the invention to the technical essence and the achieved result is cast iron / G containing,. %: Carbon 2.5-3.5 Silicon 2.5-4.3 Manganese O, 7-1.1 Antimony 0.03-0.15 Vanadium 0.03-0.35 Molybdenum 0.03-1.10 Chrom 0.03-0, 70 Aluminum O, 03–0.15 Nickel 0.7–1.7 Cerium 0.001–0.005 Magnesium 0.03–0.08 Nitrogen 0.01–0.03 IronEstal remaining However. castings does not provide the required strength of the weld, while it has a high cost. The aim of the invention is to increase the strength of the weld, reducing the cost of iron while maintaining the level of its mechanical properties. This goal is achieved by the fact that cast iron containing carbon, silicon, manganese, antimony, vanadium, molybdenum, aluminum, nickel and iron also contains barium at 132 the following ratio of components, May. %: Carbon 3.0-3.4 Silicon 1.6-2.2 Manganese 0.005-0.400 Antimony 0.08-0.12 Vanadium 0.15-0.45 Molybdenum 0.1-0.4 Aluminum 0.2 -2.0. Nickel 0.1-1.0 Barium 0.005-0.030 Iron Else Additional introduction of barium cast iron reduces the tendency of pig iron to chill in the wedge test and to form ledeburite in the weld and welded places of cast defects. In terms of its effectiveness, the effect on the structure as a graphitizing element barium exceeds the effect on the structure of cerium and magnesium. The use of bari instead of cerium and magnesium is economically feasible. The limits of the content of ingredients are chosen on the basis of the most favorable combination of the structure and properties of the welded section. Introduction Nickel, aluminum, molybdenum and barium in the composition of cast iron provides an increase in the degree of doping of the metallic base of cast iron, increasing the quality of the welding area by reducing the inclusions of cementite in the structure. the limit on the content of silicon is 1.6%, aluminum is 0.2%, nickel is 0.1% and the upper is carbon content is 3.4%, vanadium is 0.45%, molybdenum is 0.4%, manganese is 0.04% provide pearlitic structures in the welding zone with the amount of cementite not more than 8-10% and ferrite not more than 4%. The barium content (0.005-0.030%) provides the structure of the material without inclusions of eutectic cementite and is chosen experimentally. The upper limit on the concentration of silicon is 2.2%, aluminum 2.0% and the lower carbon content 3.0, vanadium 0.15%, molybdenum 0.1%, manganese 0.005% contribute to the maximum hardening of the metal base of cast iron with a minimum degree of alloying and obtaining a pearlite metal matrix. The optimal composition of cast iron oder; living%: carbon 3j2J silicon, manganese vanadium molybdenum Oj25j aluminum nickel 0.5 barium. 31 The technology for producing pig iron of the proposed composition consists of the melting of metallized pellets, the introduction of ferrosilicon (75% Si) v ferrovanadium (45% V), ferrous molybdenum (45% Mo), electrolytic nickel (99% Ni) into the melt. Before pouring, 1 molten aluminum (98.5% At), crystalline antimony (99% 5b) and silicobarium (30% 5i, 7% Ba) are introduced into the ladle. The amount of additives is calculated from the average level of absorption of silicon, aluminum, antimony, nickel at the level of 85-95%, vanadium and molybdenum at the level of 70-85%. Example. To study the properties and structure of cast iron of the proposed composition and comparative tests, the | alloys, chemical

Table 1 of which the compositions are presented in table. 1. Cast iron was smelted in an induction furnace. For testing, samples were poured into dry sand molds, plates were cut out of them, which were then welded. Welding quality was evaluated by the critical load of joint failure. The test results are shown in Table. 2, from which it follows that the additional input of barium into the composition of cast iron contributes to an increase in the strength of the weld 1.421, 64 times. At the same time, a reduction in the cost of pig iron of the proposed composition due to the exclusion of chromium, cerium, magnesium, etc. from the cast iron was established. The economic effect from the use of the invention is 51 thousand rubles.

Average

Lower Middle Upper Lower Lower Higher

3.0 3.4 0.9 0.07 0.25 0.6

0.005 0.08

0,150,1

0.02 0.1

Oh, 25O, 25

0.04 0.12

0.450.4

0.005 0.08

0,150,1

0.04 0.12

0.450.4

0.35 0.1

0.2

M

-2,0

0.2

2.0

Famous 2j Medium

14

Proposals Continuation of table. one

0.003 0.05. 0.02

0,005

0.1

0.03

0,004

0.035

Table

1100

19000150, 81

Claims (1)

PIG IRON containing carbon, silicon, manganese, antimony, vanadium, molybdenum, aluminum, nickel and iron, characterized in that, in order to increase the strength of the weld, reduce the cost of cast iron while maintaining the level of its mechanical properties, it is additionally contains barium in the following components, May. %: Carbon 3.0-3.4 Silicon 1.6-2.2 Manganese 0.005-0.400 Antimony 0.08-0.12 Vanadium 0.15-0.45 Malibden 0.1-0.4 Aluminum 0.2-2.0 Nickel 0.1-1.0 Barium 0.005-0.030 Iron Rest | About S