CN103668000B

CN103668000B - A kind of wear-resisting high hardness alloy material of rhenium-containing for pump shaft

Info

Publication number: CN103668000B
Application number: CN201310564446.2A
Authority: CN
Inventors: 胡光荣
Original assignee: Anhui Rongda Valve Co Ltd
Current assignee: Anhui Rongda Valve Co Ltd
Priority date: 2013-11-14
Filing date: 2013-11-14
Publication date: 2016-05-04
Anticipated expiration: 2033-11-14
Also published as: CN103668000A

Abstract

A kind of wear-resisting high hardness alloy material of rhenium-containing for pump shaft, chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 0.3-0.4, manganese 1.1-1.3, nickel 1.5-1.7, chromium 2.1-2.3, rhenium 0.02-0.04, Pb0.04-0.07, S≤0.04, P≤0.04, surplus are iron. The present invention, by using the elements such as rhenium, chromium, nickel to carry out modification to middle low carbon steel, has increased hardness and the wearability of steel greatly; And gradation throwing raw materials, rationally control casting after-baking temperature, the steel alloy obtaining has excellent comprehensive mechanical property, and corrosion-resistant; Use part scrap iron as raw material, and through double refining, make more stable uniform of quality. Refining agent of the present invention is for Foundry Production, and the degree of porosity in foundry goods reduces 1-2 degree, and oxide inclusion is 2 grades of left and right. Steel alloy of the present invention is for pump shaft, corrosion-resistant, wear-resisting, long service life.

Description

A kind of wear-resisting high hardness alloy material of rhenium-containing for pump shaft

Technical field

The present invention relates to metal material preparation field, relate in particular to wear-resisting high hardness alloy material of a kind of pump shaft rhenium-containing and preparation method thereof.

Background technology

The environment of pump valve work is various, badly, very high to the requirement of material, the steel alloy that pump valve is used at present has varied, technology has very much progress, but still have a lot of problems to exist, as wearability, hardness, rustless property, decay resistance, high and low temperature resistance, fragility, toughness etc., can't meet the requirement of production in a lot of occasions, also require further improvement, to enhance productivity, reduce costs, improve security, for high-quality precision and sophisticated technology development provides safeguard, for social development provides power, task is also very arduous.

Summary of the invention

The object of the present invention is to provide wear-resisting high hardness alloy material of a kind of pump shaft rhenium-containing and preparation method thereof, this alloy material has advantages of that wearability is good, hardness is high.

Technical scheme of the present invention is as follows:

A kind of wear-resisting high hardness alloy material of rhenium-containing for pump shaft, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 0.3-0.4, manganese 1.1-1.3, nickel 1.5-1.7, chromium 2.1-2.3, rhenium 0.02-0.04, Pb0.04-0.07, S≤0.04, P≤0.04, surplus are iron.

The production method of the wear-resisting high hardness alloy material of rhenium-containing for described pump shaft, is characterized in that:

(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.5-1 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying component and carry out alloying, then add scrap iron fusing, add refining agent double refining, detection and adjust chemical element component content to qualified, casting, casting after-baking etc.;

(2) in alloying process, to the lot sequence that drops into alloying element in stove be: (1) silicon, manganese, Pb; (2) nickel, chromium, rhenium; The each batch of time interval of dropping into element is 25-28 minute, after feeding intake, stirs.

Described casting after-baking is: be first warming up to 660-680 DEG C by room temperature with 170-190 DEG C/h of speed, then be cooled to 510-530 DEG C with 140-160 DEG C/h of speed, then continue to be warming up to 940-950 DEG C with 170-190 DEG C/h of speed, insulation 4-5 hour; Be cooled to 600-615 DEG C with 130-150 DEG C/h of speed again, then be warming up to 730-750 DEG C with 200-220 DEG C/h of speed, then be cooled to 560-580 DEG C with 130-150 DEG C/h of speed, insulation 70-90 minute; Be cooled to 300-310 DEG C with 120-140 DEG C/h of speed again, insulation 2-3 hour; Be warming up to 430-450 DEG C with 140-150 DEG C/h of speed again, then be cooled to 220-230 DEG C with 110-130 DEG C/h of speed, then be warming up to 530-550 DEG C with 140-150 DEG C/h of speed, insulation 2-3 hour, takes out air cooling and get final product.

Described refining agent is made up of the raw material of following weight portion: instrument comminuted steel shot 3-4, calcium carbide powder 3-4, magnesium powder 3-4, zinc oxide 2-3, titanium dioxide 1-2, sodium metaphosphate 2-3, kaolin powder 5-6, aluminum nitride powder 1-2, zirconium fluoride 1-2, jade powder 3-4, montmorillonite 1-2, calcirm-fluoride 2-3; Preparation method mixes each raw material, is heated to molten condition, then, is poured into Quench in pure water, then is ground into 100-200 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2-3%, the nano-carbon powder of 1-2%, after mixing, under 8-15Mpa, be pressed into base, then, at 900-950 DEG C, calcine 3-4 hour, cooling after, be ground into again 150-250 order powder, obtain final product.

Beneficial effect of the present invention

The present invention, by using the elements such as rhenium, chromium, nickel to carry out modification to middle low carbon steel, has increased hardness and the wearability of steel greatly; And gradation throwing raw materials, rationally control casting after-baking temperature, obtain steel alloy there is excellent comprehensive mechanical property, and corrosion-resistant; Use part scrap iron as raw material, and through double refining, make more stable uniform of quality. Refining agent of the present invention is for Foundry Production, and the degree of porosity obviously improving in yield rate, particularly foundry goods reduces 1-2 degree, can not produce pore at cast(ing) surface, and trapped oxide also obviously reduces, and oxide inclusion is 2 grades of left and right. Steel alloy of the present invention is for pump shaft, corrosion-resistant, wear-resisting, long service life.

Detailed description of the invention

A kind of wear-resisting high hardness alloy material of rhenium-containing for pump shaft, chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 0.3-0.4, manganese 1.1-1.3, nickel 1.5-1.7, chromium 2.1-2.3, rhenium 0.02-0.04, Pb0.04-0.07, S≤0.04, P≤0.04, surplus are iron.

Described pump shaft by the production method of the wear-resisting high hardness alloy material of rhenium-containing is:

(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.8 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying component and carry out alloying, then add scrap iron fusing, add refining agent double refining, detection and adjust chemical element component content to qualified, casting, casting after-baking etc.;

(2) in alloying process, to the lot sequence that drops into alloying element in stove be: (1) silicon, manganese, Pb; (2) nickel, chromium, rhenium; The each batch of time interval of dropping into element is 26 minutes, after feeding intake, stirs.

Described casting after-baking is: be first warming up to 670 DEG C by room temperature with 180 DEG C/h of speed, then be cooled to 520 DEG C with 150 DEG C/h of speed, then continue to be warming up to 945 DEG C with 180 DEG C/h of speed, be incubated 4.5 hours; Be cooled to 608 DEG C with 140 DEG C/h of speed again, then be warming up to 740 DEG C with 210 DEG C/h of speed, then be cooled to 570 DEG C with 140 DEG C/h of speed, be incubated 80 minutes; Be cooled to 305 DEG C with 130 DEG C/h of speed again, be incubated 2.5 hours; Be warming up to 440 DEG C with 145 DEG C/h of speed again, then be cooled to 225 DEG C with 120 DEG C/h of speed, then be warming up to 540 DEG C with 145 DEG C/h of speed, be incubated 2.5 hours, take out air cooling and get final product.

Described refining agent by following weight portion (kilogram) raw material make: instrument comminuted steel shot 3.5, calcium carbide powder 3.5, magnesium powder 3.5, zinc oxide 2.5, titanium dioxide 1.5, sodium metaphosphate 2.5, kaolin powder 5.5, aluminum nitride powder 1.5, zirconium fluoride 1.5, jade powder 3.5, montmorillonite 1.6, calcirm-fluoride 2.4; Preparation method mixes each raw material, is heated to molten condition, then, is poured into Quench in pure water, then is ground into 150 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2.5%, 1.5% nano-carbon powder, after mixing, under 11Mpa, be pressed into base, then, at 930 DEG C, calcine 3.4 hours, cooling after, then be ground into 200 order powder, to obtain final product.

Pump shaft of the present invention by the mechanical performance of the wear-resisting high hardness alloy material of rhenium-containing is: hot strength 1286Pa, yield strength 923MPa, percentage elongation 13.8%, the contraction percentage of area 25.9%, impact absorbing energy 50.8J, impact flexibility 63J/cm2, hardness 283.9HB.

Claims

1. the wear-resisting high hardness alloy material of rhenium-containing for pump shaft, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 0.3-0.4, manganese 1.1-1.3, nickel 1.5-1.7, chromium 2.1-2.3, rhenium 0.02-0.04, Pb0.04-0.07, S≤0.04, P≤0.04, surplus are iron;

The production method of the wear-resisting high hardness alloy material of rhenium-containing for described pump shaft:

(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:0.5-1 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying component and carry out alloying, then add scrap iron fusing, add refining agent double refining, detection and adjust chemical element component content to qualified, casting, casting after-baking;

(2) in alloying process, to the lot sequence that drops into alloying element in stove be: (a) silicon, manganese, Pb; (b) nickel, chromium, rhenium; The each batch of time interval of dropping into element is 25-28 minute, after feeding intake, stirs;

Described casting after-baking is: be first warming up to 660-680 DEG C by room temperature with 170-190 DEG C/h of speed, then be cooled to 510-530 DEG C with 140-160 DEG C/h of speed, then continue to be warming up to 940-950 DEG C with 170-190 DEG C/h of speed, insulation 4-5 hour; Be cooled to 600-615 DEG C with 130-150 DEG C/h of speed again, then be warming up to 730-750 DEG C with 200-220 DEG C/h of speed, then be cooled to 560-580 DEG C with 130-150 DEG C/h of speed, insulation 70-90 minute; Be cooled to 300-310 DEG C with 120-140 DEG C/h of speed again, insulation 2-3 hour; Be warming up to 430-450 DEG C with 140-150 DEG C/h of speed again, then be cooled to 220-230 DEG C with 110-130 DEG C/h of speed, then be warming up to 530-550 DEG C with 140-150 DEG C/h of speed, insulation 2-3 hour, takes out air cooling and get final product;

Described refining agent is made up of the raw material of following weight portion: instrument comminuted steel shot 3-4, calcium carbide powder 3-4, magnesium powder 3-4, zinc oxide 2-3, titanium dioxide 1-2, sodium metaphosphate 2-3, kaolin powder 5-6, aluminum nitride powder 1-2, zirconium fluoride 1-2, jade powder 3-4, montmorillonite 1-2, calcirm-fluoride 2-3; The preparation method of described refining agent mixes each raw material, is heated to molten condition, then, is poured into Quench in pure water, then is ground into 100-200 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2-3%, the nano-carbon powder of 1-2%, after mixing, under 8-15MPa, be pressed into base, then, at 900-950 DEG C, calcine 3-4 hour, cooling after, be ground into again 150-250 order powder, obtain final product.