CN88105047A

CN88105047A - Brasion-and impact-resistant high-carbon manganese chromium rare-earth alloy

Info

Publication number: CN88105047A
Application number: CN88105047.4A
Authority: CN
Inventors: 高德宣
Original assignee: SHENYANG URBAN ECONOMY AND TECHNOLOGY DEVELOPMENT CORP
Current assignee: SHENYANG URBAN ECONOMY AND TECHNOLOGY DEVELOPMENT CORP
Priority date: 1988-03-31
Filing date: 1988-03-31
Publication date: 1988-12-21
Also published as: CN1007913B

Abstract

The present invention is a kind of novel casting high carbon manganese and chrome rare earth alloy, its metallographic structure analysis result is troostite+eutectic carbides+martensite, when it is chrome content in reducing high-chromium alloy, improve the content of manganese, and added to make and organized fine and smooth disperse, uniformly elemental copper, molybdenum and rare earth, so high carbon manganese and chrome rare earth alloy of the present invention has the wear-resistant and shock proof advantage of high manganese of high-chromium alloy simultaneously, stability is strong, and is wear-resisting, impact resistance good, and cost descends significantly.

Description

Wear-resistant impact-resistant high-carbon manganese-chromium rare earth alloy

The invention relates to an iron-based alloy, in particular to a wear-resistant and impact-resistant high-carbon manganese-chromium rare earth alloy.

At present, the materials used for casting wear-resistant and impact-resistant mechanical parts such as grinding balls, lining plates, spoon heads, slurry pump bodies and the like similar to a ball mill are mainly high-chromium alloy steel and high-manganese steel. The high-chromium alloy steel comprises 1.8-3.2% of C, 0.5-0.9% of Si, 0.5-0.9% of Mn, 78-16% of Cr12, less than 0.05% of P.S and the balance of Fe and impurities. After the high-chromium alloy steel is subjected to heat treatment, the metallographic structure of the high-chromium alloy steel is martensite, eutectic carbide and residual austenite, and the hardness of the high-chromium alloy steel can reach over 58 HRC. The alloy steel has good wear resistance, but because the matrix structure is unstable martensite, the impact resistance is poor, the impact resistance value is generally 0.4-0.6, and mechanical parts with large impact load are frequently damaged, for example, the breakage rate of a ball mill grinding ball cast by high-chromium alloy steel is as high as 2-5%, and severe burst cracks occur when the ball mill grinding ball is used in a thermal state quenching state, and simultaneously because the chromium content in the alloy is high and the heat treatment process is complex, the material cost is high. In summary, the use of high-chromium alloy steel as a wear-resistant and impact-resistant material has great limitations, and although the high-manganese steel has relatively good impact resistance, the wear resistance cannot meet the use requirements.

The invention aims to provide a novel alloy material which has the advantages of low cost, good impact resistance and wear resistance, stable structure, difficult cracking and simple heat treatment process.

The invention relates to a novel high-carbon manganese-chromium rare earth alloy for casting, which is annealed, the metallographic structure of the alloy comprises troostite accounting for 50 percent, eutectic carbide accounting for 28 percent and martensite accounting for 22 percent, the manganese content is increased on the basis of high-chromium alloy steel, the alloy structure is troostized, the stability of the alloy structure is improved, and the contents of carbon and chromium are reduced, so that the cost of the alloy is reduced, and the brittleness of the alloy is mainly reduced.

The high-carbon manganese-chromium rare earth alloy comprises the following chemical components in percentage by weight:

1.5-2.4% of C, 0.4-1.0% of Si, 3-5% of Mn, 5-10% of Cr, 0.2-1.0% of Mo0.1-0.3% of W, 0.3-1.5% of Cu0.2-0.5% of Ni0.2-0.5% of Re, and the balance of Fe and impurities, wherein PS is less than 0.04%.

The high-carbon manganese-chromium-rare earth alloy is refined by adopting melting equipment of an alkaline furnace lining, and after casting and forming, only annealing treatment is needed, so that the hardness can reach HRC 48-55, and the impact resistance value is more than 1.0 kg.M/cm²。

The high-carbon manganese-chromium rare earth alloy has the advantages that the structure is uniformly dispersed, fine and smooth and is relatively stable, and the hardness difference among metallographic structures is small, so that the material has higher impact resistance value and better wear resistance, does not crack under the thermal state quenching condition, and has the cost reduced by more than 40 percent compared with high-chromium alloy.

Specific examples of the invention are given below:

example 1

The steel ball cast by the high-carbon manganese-chromium rare earth alloy is subjected to performance experiments in a ball mill, and the experimental components comprise 1.5-2.1% of C, 0.4-0.6% of Si, 3.5-4% of Mn, 5-7% of Cr, 0.2-0.4% of Mo0.2 or 0.1-0.3% of W, 0.3-0.7% of Cu0.2-0.4% of Ni0.2, 0.1-0.25% of Re0.1-0.25% of Fe and impurities, wherein the hardness of PS < 004% is HRC51.5 after annealing treatment at 680 ℃ for 3-4 hours, and the impact resistance value is 1.05 kg.M/cm²The 1800-hour experiment shows that the ball breaking rate is 0.16 percent, the ball breaking rate is reduced by more than twelve times compared with the high-chromium steel ball, no burst crack is found when the steel ball is quenched in a hot state at 200 ℃, the unit abrasion and the electricity consumption of the steel ball are reduced, the hourly output is obviously increased, the service life is obviously longer than that of the high-chromium cast steel ball, and the cost is reduced by 0.6 to 0.8 times compared with that of the high-chromium cast steel ball.

Example 2

A ball mill spoon head is cast by the high-carbon manganese-chromium rare earth alloy, and performance tests are carried out, wherein the components used in the tests comprise 2.2-2.4% of C, 0.6-0.9% of Si, 4-5% of Mn, 7.5-10% of Cr7, 0.5-0.9% of Mo0.5 or 0.2-0.5% of W, 0.7-1.5% of Cu0.3-0.5% of Ni0.3, 0.25-0.5% of Re0.5% of Fe and impurities, the balance of Fe and impurities, the hardness of the ball mill spoon head is HRC52.5, and the impact resistance value of the ball mill spoon head is 1.15 kg.M/cm after annealing treatment at 580 ℃ for 3-4 hours². The experiment shows that the service life of the similar product made of the high manganese steel is improved by 4.2 times.

Claims

1. An iron-based alloy, particularly a high carbon manganese-chromium rare earth alloy, characterized in that it contains, by total weight, 1.5-2.4% C, 0.4-1.0% Si, 3-5% Mn, 5-10% Cr, 0.2-1.0% Mo or 0.1-0.3% W, 0.3-1.5% Cu or 0.2-0.5% Ni, 0.1-0.5% Re, the remainder being Fe and inclusions, wherein P·S is less than 0.04%.

2. The high carbon manganese-chromium rare earth alloy according to claim 1, characterized in that it contains 1.5-2.1% C, 0.4-0.6% Si, 3.5-4% Mn, 5-7% Cr, 0.2-0.4% Mo or 0.1-0.3% W, 0.3-0.7% Cu or 0.2-0.4% Ni, 0.1-0.25% Re, the remainder being Fe and inclusions, wherein P·S is less than 0.04%.

3. The high carbon manganese-chromium rare earth alloy according to claim 1, characterized in that it contains 2.2-2.4% C, 0.6-0.9% Si, 4-5% Mn, 7.5-10% Cr, 0.5-0.9% Mo or 0.2-0.5% W, 0.7-1.5% Cu or 0.3-0.5% Ni, 0.25-0.5% Re, the remainder being Fe and inclusions, wherein P·S is less than 0.04%.