SU779428A1 - White wear-resistant cast iron - Google Patents

Description

The invention relates to metallurgy, in particular to the search for materials operating under conditions of impact abrasion. Known wear-resistant cast iron, 5 containing, wt.%: 2.0-2.5 Carbon 0.01-1.0 Silicon 0.6-0.8 Manganese 15-19 2-2.5 Nickel Else As cast iron impurities may contain up to 0.1% phosphorus and up to 0.01% sulfur. In the cast state, the cast iron has an austenite-carbide structure and a hardness of 40-41 HRC g). However, it has insufficient mechanical properties, in particular, 20 dynamic strength and durability under conditions of abrasive wear. Known also wear-resistant cast iron of the following composition, wt.% Carbon 2.5-3.2 25 Silicon Up to 0.8 Chromium 16-22 Bor0.1-0.3 Titanium0.2-0.4 Manganese 0.5-1 DZ For long after it and m ore across Izv ras 63 63 Sulfur up to 0.1 Phosphate up to 0.1 Iron. The remaining increase in wear resistance and strength to 58-63 HRC cast iron is cast from 950–980 0 from air cooling 2. However, it is noted that its strength is not sufficient in the cast acane state and annealing to a hardness of 320-360 HB is necessary. The closest to the invention of the technical essence and the achievement of the result is white wear-resistant cast iron, containing, wt.%: 3.1-3.7 Carbon 1.0-2.5 Silicon 0.5-1.0 Manganese 13.0-18 Molybdenum Less than 1 Aluminum Rest Iron ferrous cast iron has a uniform bridging in metal base type and hardness HRC Z. The disadvantages of the known cast iron are low dynymic read, not exceeding 0.4 kgf-m / cm,

and insufficient durability under conditions of intense abrasive wear.

The purpose of the invention is to increase the dynamic strength, hardness and

WEAR RESISTANCE. .

The goal is to achieve that with: TeMJ that white wear-resistant cast iron containing carbon, silicon, manganese, hrbm, molybdenum, aluminum and the same 30,. additionally contains nickel, calcium, boron and an element selected from the group consisting of titanium, strontium zirconium and yttrium, the following c (the ratio of components, wt.%:

2.7-3.5, Carbon

0.8-2.5

Silicon

0.3-1.7 Manganese

13.5-18.5 Chrome

1.3-2.3 Molybdenum

0.05-0.3 Nickel

0.01-0.2 Aluminum

0,005-0,15 Calcium

0,001-0,08 Brr

An element selected from the group containing titanium, strontium, zirconium and

0.03-b, 2

ITT) YY ISTA

Iron

As a technology for impurities, cast iron can contain up to 0.05 wt.% Phosphorus and up to 0.03 wt.% Cepid. :; -, ... , ..

The proposed cast iron is characterized by high hardness after quenching with tempering and a fine-grained structure; the cast iron can be carried out in induction and arc pulses. Rice furnaces.

 In an example, in induction electrons / ropes with a crucible of 250 kg, a number of compositions of known and proposed cast iron are smelted using .. Nuei foundry coke pig iron GUNOV LK-61A (GOST 4832-72), ferrochrome FH001 (GOST 4757-67) , ferrotitanium (GOST 4761-67), electric carbon graphite (GOST 10274-67), ferromolybdenum and other ferroalloys. The metal is released from the furnace at 151b-1550 ° C. Aluminum and titanium are applied to the production directly to the foundry buckets. Dry liquid glass molds are cast in technological samples, castings and specimens for mechanical deposition.

The table shows the test results on dynamic strength, hardness and wear resistance after. normalization from 1050s and vacation at. The resistance of drbmetiyh blades from non-ferrous cast iron during operation is | H 25% steel shot and 751 cast-iron shot fraction n & apparatus with impellers with a diameter of 500 ayl and a rotation speed of more than 1750 rpm is 270-310 hours.

Claims (3)

1. USSR author's certificate No. 326240, cl. C 22 C 37/10, 1972. 2. USSR author's certificate No. 393352, cl. C 22 C 37/06, 1973 3. Japanese patent No. 51-36691, cl. 10 J 173 (c 22 C 37/06), published 09.10.76.