SU981432A1 - Cast iron - Google Patents

Description

(54) CAST IRON

The invention relates to metallurgists of iron-based alloys, in particular to the search for materials for the production of components and parts subjected to high temperatures in corrosive environments, for example, for parts of recuperative refrigerators of cement rotary kilns. Cast iron 1 is known, which has low plastic properties. and low heat resistance; therefore, it has found wide application. The closest in technical property and to the achieved result in iron 2J containing the following components, wt.%: 2.5-3.5 Carbon 1.5-2.5 Silicon 1.0-5.0 Manganese 1.0-4 , O з, а.б, о Aluminum 0,15-1,0 Titan Bor 0.03-0.09 Iron The Rest. Known cast iron with regard to strength properties, mainly satisfies the requirement of HH5IM. to the cast irons that are operated under high temperature conditions in the presence of a gas corrosive environment. However, they do not meet the exact requirements for cast iron in terms of hardness and plastic properties both in the process of manufacturing parts and in operation. Cast iron 12 / is applicable only in castings of simple configuration and low weight. Parts from this cast iron are prone to cracking when there are sharp transitions from thin to thick sections in the case, as well as an increase in geometrical and napaMetw grooves in parts.

The goal is achieved by the fact that cast iron additionally contains nickel, magnesium and altium in the following ratio of particles

Carbon

2.5-3.5 1.5-2.5

Silicon

Manganese 1.0-5.0

Chrome 1, a-4, O Oh, 3-3,0. Aluminum

Titan 0, O5-1, O 6, OO5-O, 03

Boron

Nickel 0.02-0.4

Magnesium 0, O1-O, 1

Calcium 0.02-0.2 Iron Rest.

In tab. Figure 1 shows the chemical composition of cast iron.

In tab. 2 are given plastic properties resistant properties of cast iron.

In tab. 3 shows the heat resistance20 of the plates on the recuperative cast iron cooler at the temperature of a gas oven of a rotating furnace measuring 3.6 / 150 m

current 7OO-75O C (average loss; is more than 45 thousand rubles.

.Table

sample weights for different test durations, h)

Plastic properties and heat resistance at operating temperatures up to the iron according to the invention significantly exceed the same values of the known iron.

The introduction of cast iron according to the invention into production allows to produce castings with enhanced plastic and heat-resistant properties and high performance characteristics.

The service life of the parts of the recuperator chillers of cast iron cast iron according to the invention is increased by 1.5-2.0 times in comparison with the parts, the production of 1X of known cast iron, and the annual economic effect from the introduction of

Famous

TabliaaZ

Claims (1)

The claims ²⁰ Cast iron containing carbon, silicon, manganese, chromium, aluminum, titanium, boron and iron, characterized in that, in order to increase heat resistance, plastic and operational properties, it additionally contains nickel, magnesium and calcium in the following ratio of components, wt.% : Aluminum Titanium Boron Nickel Magnesium Calcium Iron * 0.3-3.0 0.05-1.00 0.005-0.030 0.02-0.40 0.01-0.10 0.02-0.20 Else Carbon 2.5-3.5 thirty Silicon 1.5-2.5 Manganese 1.0-5.0 Chromium 1.0-4.0