CN104213031A

CN104213031A - High-temperature resistant alloy steel material for pump valve and preparation method thereof

Info

Publication number: CN104213031A
Application number: CN201410380999.7A
Authority: CN
Inventors: 胡光荣
Original assignee: Anhui Rongda Valve Co Ltd
Current assignee: Anhui Rongda Valve Co Ltd
Priority date: 2014-08-05
Filing date: 2014-08-05
Publication date: 2014-12-17

Abstract

The invention discloses a high-temperature resistant alloy steel material for a pump valve. The alloy steel material comprises the following chemical elements in percentage by mass: 0.2-0.4% of carbon, 0.7-0.9% of silicon, 1.7-2.3% of manganese, 0.1-0.2% of molybdenum, 1.1-1.3% of vanadium, 2.4-2.6% of chrome, 0.04-0.07% of In, not more than 0.04% of S, not more than 0.04% of P, and the balance iron. The elements of vanadium and In are used, the raw materials are poured in batches, and the post-casting heat treatment temperature is reasonably controlled, so that the alloy has such performances as high-temperature resistance, wear resistance and solid self-lubrication, is suitable for producing high-temperature wear resistant operation parts, can be used for producing such products as sliding bearings, bearing bushes, shaft sleeves, wear resistant lining plates, sliding plates and machine tool slide ways with various shapes under low load or heavy load, which can replace copper alloy products, has such advantages as pressure resistance and wear resistance, and can prominently prolong the service life of workpieces.

Description

A kind of high temperature resistant pump valve alloy steel material and preparation method thereof

Technical field

The present invention relates to field of metal preparation, particularly relate to a kind of high temperature resistant pump valve alloy steel material 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 of current pump valve has varied, technology has very much progress, but still have a lot of problem to exist, as wear resistance, hardness, rustless property, corrosion resistance nature, high and low temperature resistance, fragility, toughness etc., the requirement of production can't be met in a lot of occasion, 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 a kind of high temperature resistant pump valve alloy steel material and preparation method thereof, this alloy material has good, the high temperature resistant temperature of wear resistance, wear-resisting advantage.

Technical scheme of the present invention is as follows:

A kind of high temperature resistant pump valve alloy steel material, is characterized in that: the chemical element composition that it contains and mass percent thereof are: carbon 0.2-0.4, silicon 0.7-0.9, manganese 1.7-2.3, molybdenum 0.1-0.2, vanadium 1.1-1.3, chromium 2.4-2.6, In0.04-0.07, S≤0.04, P≤0.04, surplus are iron.

The production method of described high temperature resistant pump valve alloy steel material, is characterized in that:

(1), the preparation pig iron and scrap iron are originated as ferrous substrate in 1:1-2 ratio, the pig iron is added drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection adjust chemical element component content to qualified, casting, casting postheat treatment etc.;

(2) lot sequence, dropping into alloying element in alloying process in stove is: (1) silicon, In; (2) manganese, molybdenum; (3) other remaining component; The each batch of timed interval of dropping into element is 23-26 minute, stirs after feeding intake.

Described casting postheat treatment is: first by room temperature with 210-230 DEG C/h of ramp to 680-700 DEG C, insulation 60-80 minute, be cooled to 510-520 DEG C with 180-190 DEG C/h of speed again, then continue with 210-230 DEG C/h of ramp to 935-945 DEG C, insulation 4-5 hour; 600-620 DEG C is cooled to again with 170-180 DEG C/h of speed, then with 210-230 DEG C/h of ramp to 750-760 DEG C, then be cooled to 500-510 DEG C with 170-180 DEG C/h of speed, insulation 60-80 minute; 230-240 DEG C is cooled to again, insulation 2-3 hour with 150-170 DEG C/h of speed; Again with 160-170 DEG C/h of ramp to 320-330 DEG C, insulation 40-60 minute, then with 160-170 DEG C/h of ramp to 520-540 DEG C, 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 part: instrument comminuted steel shot 3-4, kaolin 2-3, aluminium sesquioxide 1-2, magnesium oxide 4-5, montmorillonite 1-2, Zirconium tetrafluoride 1-2, alum 2-3, sodium alginate 2-3, tripoly phosphate sodium STPP 1-2, lapis amiridis 2-3, copper sulfate 1-2, potassium silicofluoride 2-3, SODIUMNITRATE 2-3; Each raw material mixes by preparation method, is heated to molten state, 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, 3-4 hour is calcined, after cooling, be ground into 150-250 order powder again, obtain final product.

Beneficial effect of the present invention

The present invention is by using the element such as vanadium, In, and gradation throwing raw materials, conservative control casting postheat treatment temperature, alloy is made to have the performances such as high temperature resistant, wear-resistant, self-lubricating solid, be applicable to make high-temperature wearable operation part, the products such as the sliding surface bearing under the low heavy loading of different shape, bearing shell, axle sleeve, abrasion-proof backing block, slide plate, lathe slideway can be prepared into, copper alloys product can be replaced, the advantage such as have carrying capacity, resistance to wear, can work-ing life of significant prolongation workpiece.Refining agent of the present invention is used for Foundry Production, significantly improves yield rate, and the degree of porosity particularly in foundry goods reduces 1-2 degree, and can not produce pore at cast(ing) surface, trapped oxide also obviously reduces, and oxide inclusion is at about 2 grades.

Embodiment

A kind of high temperature resistant pump valve alloy steel material, the chemical element composition that it contains and mass percent thereof are: carbon 0.2-0.4, silicon 0.7-0.9, manganese 1.7-2.3, molybdenum 0.1-0.2, vanadium 1.1-1.3, chromium 2.4-2.6, In0.04-0.07, S≤0.04, P≤0.04, surplus are iron.

The production method of described high temperature resistant pump valve alloy steel material is as follows:

(1), the preparation pig iron and scrap iron are originated as ferrous substrate in 1:1.5 ratio, the pig iron is added drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection adjust chemical element component content to qualified, casting, casting postheat treatment etc.;

(2) lot sequence, dropping into alloying element in alloying process in stove is: (1) silicon, In; (2) manganese, molybdenum; (3) other remaining component; The each batch of timed interval of dropping into element is 25 minutes, stirs after feeding intake.

Described casting postheat treatment is: elder generation with 220 DEG C/h of ramp to 690 DEG C by room temperature, is incubated 70 minutes, then is cooled to 515 DEG C with 185 DEG C/h of speed, then continue with 220 DEG C/h of ramp to 940 DEG C, be incubated 4.5 hours; 610 DEG C are cooled to again with 175 DEG C/h of speed, then with 220 DEG C/h of ramp to 755 DEG C, then be cooled to 505 DEG C with 175 DEG C/h of speed, be incubated 70 minutes; Be cooled to 235 DEG C with 160 DEG C/h of speed again, be incubated 2.6 hours; Again with 166 DEG C/h of ramp to 324 DEG C, be incubated 50 minutes, then with 164 DEG C/h of ramp to 530 DEG C, be incubated 2.6 hours, take out air cooling and get final product.

Described refining agent is made up of the raw material of following weight part (kilogram): instrument comminuted steel shot 3.5, kaolin 2.5, aluminium sesquioxide 1.5, magnesium oxide 4.5, montmorillonite 1.5, Zirconium tetrafluoride 1.5, alum 2.5, sodium alginate 2.5, tripoly phosphate sodium STPP 1.5, lapis amiridis 2.5, copper sulfate 1.5, potassium silicofluoride 2.5, SODIUMNITRATE 2.5; Each raw material mixes by preparation method, is heated to molten state, 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%, the nano-carbon powder of 1.5%, after mixing, under 12Mpa, be pressed into base, then, calcine 3.5 hours at 920 DEG C, after cooling, then be ground into 210 order powder, obtain final product.

The mechanical property of the present invention is high temperature resistant pump valve alloy steel material is: tensile strength 1188MPa, yield strength 957MPa, unit elongation 13.2%, relative reduction in area 23.8%, impact absorbing energy 51.3J, impelling strength 60.4J/cm2, hardness 294HB.

Claims

1. a high temperature resistant pump valve alloy steel material, is characterized in that: the chemical element composition that it contains and mass percent thereof are: carbon 0.2-0.4, silicon 0.7-0.9, manganese 1.7-2.3, molybdenum 0.1-0.2, vanadium 1.1-1.3, chromium 2.4-2.6, In0.04-0.07, S≤0.04, P≤0.04, surplus are iron.

2. the production method of high temperature resistant pump valve alloy steel material according to claim 1, is characterized in that:

3. the production method of high temperature resistant pump valve alloy steel material according to claim 2, it is characterized in that: described casting postheat treatment is: first by room temperature with 210-230 DEG C/h of ramp to 680-700 DEG C, insulation 60-80 minute, 510-520 DEG C is cooled to again with 180-190 DEG C/h of speed, continue with 210-230 DEG C/h of ramp to 935-945 DEG C again, insulation 4-5 hour; 600-620 DEG C is cooled to again with 170-180 DEG C/h of speed, then with 210-230 DEG C/h of ramp to 750-760 DEG C, then be cooled to 500-510 DEG C with 170-180 DEG C/h of speed, insulation 60-80 minute; 230-240 DEG C is cooled to again, insulation 2-3 hour with 150-170 DEG C/h of speed; Again with 160-170 DEG C/h of ramp to 320-330 DEG C, insulation 40-60 minute, then with 160-170 DEG C/h of ramp to 520-540 DEG C, insulation 2-3 hour, takes out air cooling and get final product.

4. the production method of high temperature resistant pump valve alloy steel material according to claim 2, is characterized in that: described refining agent is made up of the raw material of following weight part: instrument comminuted steel shot 3-4, kaolin 2-3, aluminium sesquioxide 1-2, magnesium oxide 4-5, montmorillonite 1-2, Zirconium tetrafluoride 1-2, alum 2-3, sodium alginate 2-3, tripoly phosphate sodium STPP 1-2, lapis amiridis 2-3, copper sulfate 1-2, potassium silicofluoride 2-3, SODIUMNITRATE 2-3; Each raw material mixes by preparation method, is heated to molten state, 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, 3-4 hour is calcined, after cooling, be ground into 150-250 order powder again, obtain final product.