CN103290302A

CN103290302A - High-strength alloy nodular cast iron crankshaft

Info

Publication number: CN103290302A
Application number: CN2012100444272A
Authority: CN
Inventors: 徐驰
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-02-27
Filing date: 2012-02-27
Publication date: 2013-09-11

Abstract

The invention provides a high-strength alloy nodular cast iron crankshaft, relates to a crankshaft for gasoline engines, diesel engines, petroleum machinery and the like, and mainly solves the problems of crankshafts produced at home and abroad at present such as high cost, low qualification rate and the like. The product is prepared through the following steps: melting and smelting in a cupola furnace; adding manganese and silicon in a back furnace; adding rare earth-magnesium alloy, antimony, barium, copper, molybdenum and the like in a front furnace; incubating multiple times; and casting at 1370-1400 DEG C. The product comprises iron used as the main component and other oligo-elements and minor elements; and the weight percents of the specific oligo-elements and minor elements are sequentially as follows: 3.2-3.4% of carbon, 2.4-2.6% of silicon, 0.6-0.8% of manganese, no more than 0.04% of phosphorus, no more than 0.028% of sulfur, 0.06-0.08% of magnesium, 0.04-0.06% of rare earth, 0.47-0.5% of copper, 2.0-2.3% of molybdenum, 0.01-0.02% of antimony and 0.06-0.08% of barium. The crankshaft has the advantages of low production cost and long service life; and both the tensile strength and the elongation percentage of the crankshaft exceed national standards and international standards.

Description

The high-strength alloy ductile iron crankshaft

Technical field:

The present invention relates to used bent axles such as a kind of petrol motor, diesel engine, the power generator group of taking off and peculiar to vessel, mine, petroleum machinery, electric power.

Background technology:

Though the bent axle of producing has both at home and abroad reached national standard and international standard at present, the production cost height, product percent of pass is low, and work-ing life is short.

Summary of the invention:

It is low that technical problem to be solved by this invention provides a kind of production cost, product percent of pass height, the high-strength alloy ductile iron crankshaft of long service life.

Above-mentioned purpose is achieved in that with cupola melting smelts, back stove manganese addition, silicon, and forehearth adds magnesium-rare earth, antimony, barium, copper, molybdenum etc., repeatedly breeds, and pouring temperature is 1370-1400 ℃; The chemical element of product is formed based on iron, and other oligo-elements and micro-shared weight % are followed successively by: carbon 3.2-3.4, silicon 2.4-2.6, manganese 0.6-0.8, phosphorus≤0.04, sulphur≤0.028, magnesium 0.06-0.08, rare earth 0.04-0.06, copper 0.47-0.5, molybdenum 2.0-2.3, antimony 0.01-0.02, barium 0.06-0.08.

Advantage of the present invention is: only smelt with cupola melting, so cost is low, the bent axle product percent of pass height of producing is through test, tensile strength reaches 910Mpa, unit elongation 〉=5.5%, tensile strength and unit elongation are all far above national standard and international standard, and unit elongation is higher 1.5 times than national standard and international standard, lubricate, noise is little, and is wear-resistant, long service life.

Embodiment:

Smelt with cupola melting, back stove manganese addition, silicon, forehearth adds magnesium-rare earth, antimony, barium, copper, molybdenum etc., repeatedly breeds, and pouring temperature is 1370-1400 ℃; The chemical element of product is formed based on iron, other oligo-elements and micro-shared weight % are followed successively by: carbon 3.2 or 3.3 or 3.4, silicon 2.4 or 2.5 or 2.6, manganese 0.6 or 0.7 or 0.8, phosphorus≤0.04, sulphur≤0.028, magnesium 0.06 or 0.07 or 0.08, rare earth 0.04 or 0.05 or 0.06, copper 0.47 or 0.48 or 0.5, molybdenum 2.0 or 2.1 or 2.3, antimony 0.01 or 0.02, barium 0.06 or 0.07 or 0.08.

Claims

1. high-strength alloy ductile iron crankshaft, it is characterized in that: the chemical element of product is formed based on iron, and other oligo-elements and micro-shared weight % are followed successively by: carbon 3.2-3.4, silicon 2.4-2.6, manganese 0.6-0.8, phosphorus≤0.04, sulphur≤0.028, magnesium 0.06-0.08, rare earth 0.04-0.06, copper 0.47-0.5, molybdenum 2.0-2.3, antimony 0.01-0.02, barium 0.06-0.08.