SU1043179A1 - Aigh-phosphrus cast iron - Google Patents

Abstract

HIGH-Phosphorus Iron, containing carbon, silicon, margens, phosphorus, aluminum, copper, titanium, copper, rare earth metals and iron, characterized in that, in order to improve the mechanical properties and thermal stability, it additionally contains magnesium, antimony and nitrogen in the following ratio, wt.%: Carbon 2.5-4.3 Silicon0.8-2.6 Manganese. 0.2–1.0 Phosphorus 0.2–1.0 Aluminum 0.01–1.2 Copper, .01–1.0 Titus, 0.03–0.2 Calcium. 0.01-0.1 Rare-earth 0.01-0.1 Metals Magnesium 0.01-0.05 Antimony 0.01-0.03 (O Nitrogen 0.01-0.05 Iron Rest C

Description

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UD The invention relates to metallurgy, in particular to the search for gray cast irons with increased long-term durability and heat resistance for working under heat cycle conditions. Known cast iron ij of the following chemical composition, wt.%: 3.0-3.4 Carbon Silicon 1.8-2.3 0.5-1.2. Manganese 0.05-0.25 Chromium 0.1-0.3 Nickel 0.1-0.4 Copper 0.1-0.4 Vanadium 0.1-0.9 Molybdenum 0.1-0.5 Phosphorus Iron The rest However, this cast iron is characterized by an insufficient level of strength. properties. Cast iron is known for the manufacture of glass production molds of the following chemical composition, wt%: Carbon3.4-3.8 Silicon1.6-2.2 Manganese 0.4-0.7 Titanium 0.2-0.5. Molybdenum O, 3–0.6 Vanadium, 0.1–0.4 IronErestal As an impurity, cast iron contains up to 1.0 wt.% Of phosphorus and up to 0.008 wt.% Of sulfur. Castings from this iron are subjected to heat treatment according to the mode: heating up, holding for 4 hours and slow cooling 2J. After heat treatment, the cast iron has a pearlitic structure with crayons: graphite inclusions, good physicochemical properties, but insufficient performance properties are observed when operating under heat conditions with high thermal stresses and mechanical loads. The disadvantage of this iron is also not kaline resistance. The closest in technical essence and the achieved effect is high-phosphorous cast iron 3 of the following chemical composition, wt.%: 2.5-4.3 Pyrherod -1.45-1.2 Silicon 0.2-1.0 Manganese Tltan, 03 -0.2 0.5-1, Phosphorus 0.05-1.4 Aluminum 0.01-0.25 Calcium 0.01-1.0 Copper. Rare-earth metals 0.01-0.25 Iron Else The well-known cast iron has the following physicomechanical properties, tensile strength 150-247 MPa, dynamic strength 0.01-0.02; MJ / m, deflection boom 5.0-6.0 mm / strength at 98.0-118 MPa. This cast iron possesses good casting properties, is characterized by a more equal uniformity. and a favorable arrangement of graphite than the described cast iron., however, its strength properties do not exceed the level of cast iron of the grade MF 20.. . The disadvantages of the known cast iron are low mechanical properties and thermal resistance. When heating products from it to thermal resistance is 400-750 heat cycles, and when heated to about 900 ° C, it does not exceed 250 heat cycles. The purpose of the invention is to improve the mechanical properties and thermal resistance of high-phosphorus pig iron. The goal is achieved by the fact that highly phosphorus cast iron containing carbon, silicon, and margamine. Nets, phosphorus, alkanium, copper, titanium, calcium, rare earth metals and iron, additionally contains magic (antimony, nitrogen and nitrogen in the following ratio of components, wt.%:. To; quality of the technological impurity cast iron may contain sulfur in the amount of 0 , 01-0.12 wt.%. The introduction of magnesium phosphate in high-phosphorous sulfur in an amount of 0.010, 05 wt.% Ensures the spheroidization of graphite in the structure of castings and increases its strength and plastic properties. When introduced into high-phosphorus iron in an amount of less than 0, 01 wt.% Change in structure and properties The concentration of chromium in the high-phosphorus iron is 0, j01-0.03 wt.% of antimony, the uniformity and stability of the structure and mechanical properties decrease, the size of the castings decreases when they are heated. and cooling and growth of pig iron. When introduced to 0.01 wt.%, the positive effect is negligible. The increase in its content decreases the embrittlement effect of phosphorus, aluminum, phosphide and sulfide. i eutectic, resulting in increased ductility and viscosity of cast iron. Reducing the concentration of antimony more than 0.03 wt.% contributes to an increase in chill and deterioration of the form of graphite .. Nitrogen in an amount of 0.01-0.05 is introduced into highly phosphorus cast iron as an effective alloy The component b is an increase in thermal resistance and scaling due to the formation of carbonitrides and nitrides that are resistant at elevated temperatures. Its content is taken from a concentration of 0.01 wt.%, When its effect on the thermal stability of cast iron begins to have an effect. and is limited to a content of 0.05 ffec.t, since a further increase in its concentration reduces the dynamic strength of the castings. The upper aluminum content is limited to 1.2 wt.%, Since the introduction of a higher amount of aluminum causes technological difficulties.

Table 1 and leads to a decrease in ductility. The upper calcium content is limited to 0.1 wt.%, Since higher concentrations do not dissolve in the cast iron and also lead to a decrease in the ductility and viscosity of the cast iron in Livkah. Smelting of cast iron of various compositions produced by a duplex process cupola - induction mixer. Scaling of metal into metal forts. To obtain samples, process samples and castings, R 1350-1380 C was produced. Table. 1 shows the composition of the investigated cast iron. in tab. 2 shows the mechanical properties and thermal stability, cast iron. As can be seen from the table. 2, the values of strength characteristics and thermal resistance exceed the same values of the known iron. Cast iron may be enameled. The economic efficiency of implementing the invention will be 12-18 rubles. per ton ready to pour.

Carbon

Silicon

Manganese

Phosphorus

Aluminum

Copper

Titanium

Calcium

Redkoz imeme metals

Magnesium Antimony Nitrogen Sulfur Iron

Strength at stretching, MPa.

Durability with, MPa

Dinaische strength, MJ / m

Deflection arrow, "

Thermal stability during arthritis up to 900 ° C cycles

Zakali resistance, mg / h

Table 2

249.1.256.9261.8 274.8

130,1135j8141.0 145.1

0.0870.0720.0680.065

9.38.78.5 8.1

520,612

638 680

13.6 11.8 10.6 10.2

Claims (1)

<claim-text> HIGH-Phosphorous Iron, </ claim-text> </ td> <td> <claim-text> Magnesium </ claim-text> </ td> <td> <claim-text> 0.01-0.05 </ claim-text> </ td> </ tr> <tr> <td> <claim-text> containing carbon, silicon, marga-. . </ claim-text> </ td> <td> <claim-text> Antimony </ claim-text> </ td> <td> <claim-text> 0.01-0.03 </ claim-text> </ td> </ tr> <tr> <td> <claim-text> hell, phosphorus, aluminum, copper, titanium, </ claim-text> </ td> <td> <claim-text> Nitrogen </ claim-text> </ td> <td> <claim-text> 0.01-0.05 </ claim-text> </ td> </ tr> <tr> <td> <claim-text> calcium, rare earth metals and </ claim-text> </ td> <td> <claim-text> Iron </ claim-text> </ td> <td> <claim-text> Else </ claim-text> </ td> </ tr> </ table> <claim-text> go </ claim-text> <claim-text> m </ claim-text> <claim-text> 1 </ claim-text> <claim-text> 1043179 </ claim-text>