SU1073974A1 - Composition of charge of core wire electrode for wear-resistant building-up - Google Patents

Abstract

COMPOSITION OF CHARGE POWDER WIRE DURING FOR WEAR RESISTANT SURFACE, containing metallic manganese. nitrided manganese, ferrovanadium, ferrosilicon and iron powder, in order to reduce the cost and improve the manufacturability of the charge of the powder wire with increased wear resistance of the deposited material, the composition additionally contains ferromanganese and calcium carbonate in the following ratio of ingredients, wt.%: Metallic manganese 26-35 Nitrided manganese 0.8-1.5 Ferrovanadium2-5 Ferromanganese 2.5-5 Ferrosilicon 0.5-1.5 Carbonate feces: p1y 5-8 (L Iron Powder Rest

Description

The invention relates to the field of welding materials, mainly to electric arc surfacing wear-resistant alloys with unstable austenite and can be used in the manufacture or restoration of machine parts to increase their durability. . .

The composition of the flux-cored wire, consisting of a steel shell and a powdery mixture containing chromium, manganese, nitrated manganese, ferromolybdenum, ferrovanadium, silicon copper, ferroniobium, titanium dioxide, fluoroplastic, iron powder in the following ratio of components, wt.%, Chrome 10-20

Manganese Metallic 9-18

Manganese azotiro s |

0.5-2.0 bath

with

1-4

Ferromolybdeas

0.2-3.0 Ferrovanadium 0.3-4.5 Silicon copper 0.2-0.4 Ferroniobium 2.5-0.4 Titanium dioxide Oh, 25-0.50 Fluoroplast

10-20 Iron powder Else Steel sheath

A disadvantage of the known composition is the presence in it of expensive and scarce components: ferromolybdenum, ferroniobi, and titanium dioxide. In addition, it contains an increased amount of chromium, which is justified only in the case of the use of surfacing of parts, which requires an increase in corrosion resistance. After surfacing with these materials, the separation of slag crust is difficult. In addition, very careful drying of the batch materials is required, preventing hydrogen from entering the weld metal.

The composition of the cored wire for surfacing is known, consisting of a steel sheath and a powdery mixture containing graphite, manganese, ferrovanadium, molybdenum, aluminum, ferrosilicon, iron powder, manganese carbon and ferrotitanium in the following ratio of components, wt.% Graphite 0.2-0-0, five

Manganese Metallic 4,0-6,0

Nitriated manganese 5, 0-rlO Ferrovanadium 2.0-6.0 Molybdenum metal, 2.0-4.0 Ferrotitanium 4.0-9.0 Aluminum powder 2.0-6.0 Ferrosilicon 0.5-2, 0, Iron powder 3.0-7.0 Steel sheath Else However, this composition of flux-cored wire contains such scarce and expensive components as molybdenum, ferrotitanium, aluminum. In addition, this composition of the cored wire requires considerable labor costs for drying and its manufacture.

The purpose of the invention is the development of the charge of the powder wire with a reduced cost and improved manufacturability with increased wear resistance: the metal deposited by it.

This goal is achieved by the fact that lpchta of cored wire containing metallic manganese, nitrated manganese, ferrosilicon, ferrovanadium and iron powder, additionally contains ferromanganese and calcium carbonate in the following ratio of components, wt.%: Manganese metal. 26-35 Nitrided manganese 0.8-1.5 ferrovanadium 2-5 Ferromanganese 2.5-5

Ferrosilicon 0.5-1.5

Calcium carbonate 5-8

Iron Powder Rest

The composition of the sheathed cored wire is selected with / in such a way that the weld metal has the structure of a metastable austenite, which undergoes martensite transformations during the loading process;

The amount of metallic manganese is chosen so that the floor, manganese austenite, has a certain degree of stability. With a small amount of carbon, the content of metallic manganese in the charge below 26% is not enough to prevent the formation of martensite when cooled in the weld metal, and, as a result, cracking is possible.

Introduction to the composition of the charge of metallic manganese in an amount exceeding 35%. strongly stabilizes austenite with respect to y-o transformation and reduces its ability to harden during loading.

Manganese nitrated and ferrovanadium are introduced into the composition of the charge in amounts of 0.8-1.5 and 2-5%, respectively. This is done to obtain vanadium carbonitrides in the austenite matrix of the deposited metal, which strengthen the steel and increase wear resistance.

A lower content of these elements is inefficient since the volume of the hardening phase is small.

An increase in nitrated manganese at 1.5% leads to the appearance of porosity in the weld metal. This is because the amount of nitrogen exceeds its solubility limit in austenite.

Increasing the vanadium concentration in excess of 5% binds all carbon into carbides and removes it from the solid solution, which leads to the formation of martensite in the weld metal and promotes the formation of cracks.

Ferromanganese in the amount of 2.5-5% was introduced into the composition of the flux-cored wire to obtain, along with the required amount of manganese, carbon. The carbon content in the crushed metal should be in the range of O, 15-0.30%. The content of ferromanganese less than 2.5 is unacceptable, because The amount of carbon in the weld metal becomes O, 15%, which, if the manganese content at the lower limit can cause the formation of martensite and, accordingly, the formation of cracks in the molten metal and a decrease in wear resistance. The introduction of more than 5% of ferromanganese into the mixture results in a 0.3% carbon in the weld metal, which significantly complicates the machining process. Ferrosilicon in the amount of O, 51, 5% was introduced into the composition of the charge in order to increase wear resistance and strengthen austenite by doping it with silicon. The lower content of this component has little effect on hardening and wear resistance. An excess of its amount in excess of 1.5% results in the formation of cracks. Calcium carbonate in an amount of 5–8% improves the manufacturability of the filler material, reduces the hydrogen content in the weld metal and, accordingly, improves the quality of the weld metal. Of all the variants of the composition of the charge flux-cored wire, the best properties are compositions in the following ratio of components (table). G.,. , ..., "- .. For a build-up, a two-joint powder tape made of 08KP steel is used. The surfacing is made on the welding machine A-874H using the VDU-1001 power source. The surfacing mode: current 600-650 A, voltage 30-32 V, surfacing speed 5 m / h. Testing of the metal deposited with flux-cored wire with the charge, the composition of which is given in the table is carried out on the machine MI-1M according to the scheme of a roller under 75 kg load. 4 Described powder rovor provides higher relative wear resistance of the weld metal,%: Composition 11.10 Composition 2J, 20 Composition 31.15 Analogue1.00. The given charge of the flux-cored wire does not contain expensive: there are also scarce alloying elements and exceeds the wear resistance of the known by 10-20% ... The advantage of a new material, in contrast to the known one, is the good separability of the putty rind and the possibility of its use without drying the components, which reduces the time required for the manufacture of cored wire. Thus, the composition of the charge of the flux-cored wire has a low cost, increased wear-resistance, bone and is characterized by improved welding-technological properties. This composition of the charge of flux-cored wire is recommended to be used for surfacing parts of metallurgical equipment,. The composition of the charge cored wire

Claims (1)

COMPOSITION OF THE BATTERY OF POWDER WIRE FOR WEARABLE SURFACE, containing manganese metal,