CN104213042A

CN104213042A - Alloy steel material for pump shell and manufacturing method thereof

Info

Publication number: CN104213042A
Application number: CN201410380974.7A
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

Disclosed is an alloy steel material for a pump shell. Chemical elementary compositions of the material comprise, by mass, 0.2 percent to 0.4 percent of carbon, 0.8 percent to 1.1 percent of silicon, 1.2 percent to 1.4 percent of manganese, 0.9 percent to 1.1 percent of chromium, 0.02 percent to 0.04 percent of nickel, 0.12 percent to 0.15 percent of molybdenum, 0.03 percent to 0.05 percent of cobalt, 0.6 percent to 0.8 percent of aluminum, 0.05 percent to 0.08 percent of tungsten, 0.02 percent to 0.04 percent of titanium, 0.7 percent to 0.9 percent of boron, S smaller than or equal to 0.04 percent, P smaller than or equal to 0.04 percent and the balance iron. According to the alloy steel material, aluminum, chromium, boron and other elements are used; raw materials are input by several times; the heat treatment temperature after casting is reasonably controlled; and the formed alloy has the high hardness, strength and abrasive resistance, has the excellent toughness and impact resistance properties, and is good in anti-corrosion property. Part of scrap iron is used as the raw material; secondary refining is carried out on the raw material; and the quality is more stable and uniform. Alloy steel is used for the pump shell, and compared with a common pump shell, the service life of the pump shell is prolonged by 50 percent.

Description

A kind of pump case alloy steel material and preparation method thereof

Technical field

The present invention relates to field of metal preparation, particularly relate to a kind of pump case 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 pump case alloy steel material and preparation method thereof, this alloy material has the good advantage of high rigidity, corrosion-resistant, anti-high impact-resistant and wear resistance.

Technical scheme of the present invention is as follows:

A kind of pump case 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 0.8-1.1, manganese 1.2-1.4, chromium 0.9-1.1, nickel 0.02-0.04, molybdenum 0.12-0.15, cobalt 0.03-0.05, aluminium 0.6-0.8, tungsten 0.05-0.08, titanium 0.02-0.04, boron 0.7-0.9, S≤0.04, P≤0.04, surplus are iron.

The production method of described pump case alloy steel material, is characterized in that:

(1), the preparation pig iron and scrap iron are originated as ferrous substrate in 1:1-1.5 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, manganese, tungsten; (2) chromium, nickel, titanium; (3) molybdenum, boron; (4) other remaining component; The each batch of timed interval of dropping into element is 20-23 minute, stirs after feeding intake.

Described casting postheat treatment is: first by room temperature with 150-160 DEG C/h of ramp to 660-670 DEG C, insulation 50-60 minute, 510-520 DEG C is cooled to again with 150-160 DEG C/h of speed, then with 200-210 DEG C/h of ramp to 930-940 DEG C, insulation 4-5 hour; 600-620 DEG C is cooled to again with 150-160 DEG C/h of speed, then with 170-180 DEG C/h of ramp to 730-740 DEG C, then be cooled to 550-560 DEG C with 150-160 DEG C/h of speed, insulation 60-70 minute; 320-330 DEG C is cooled to again, insulation 2-3 hour with 130-140 DEG C/h of speed; Again with 140-150 DEG C/h of ramp to 430-450 DEG C, insulation 40-60 minute, then with 140-150 DEG C/h of ramp to 510-520 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 elements such as aluminium, chromium, boron, and by gradation throwing raw materials, conservative control casts postheat treatment temperature, and the alloy of formation not only has high hardness, intensity, wear resistance, also has excellent toughness and impact resistance, corrosion resistance and good; Use part scrap iron as raw material, and through secondary refining, make quality more stable uniform.Steel alloy of the present invention is used for pump case, increases by 50% work-ing life than common pump case.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 pump case alloy steel material, the chemical element composition that it contains and mass percent thereof are: carbon 0.2-0.4, silicon 0.8-1.1, manganese 1.2-1.4, chromium 0.9-1.1, nickel 0.02-0.04, molybdenum 0.12-0.15, cobalt 0.03-0.05, aluminium 0.6-0.8, tungsten 0.05-0.08, titanium 0.02-0.04, boron 0.7-0.9, S≤0.04, P≤0.04, surplus are iron.

The production method of described pump case alloy steel material is as follows:

(1), the preparation pig iron and scrap iron are originated as ferrous substrate in 1:1 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, manganese, tungsten; (2) chromium, nickel, titanium; (3) molybdenum, boron; (4) other remaining component; The each batch of timed interval of dropping into element is 21 minutes, stirs after feeding intake.

Described casting postheat treatment is: elder generation with 155 DEG C/h of ramp to 665 DEG C by room temperature, is incubated 55 minutes, then is cooled to 515 DEG C with 155 DEG C/h of speed, then with 205 DEG C/h of ramp to 935 DEG C, be incubated 4.5 hours; 610 DEG C are cooled to again with 155 DEG C/h of speed, then with 175 DEG C/h of ramp to 735 DEG C, then be cooled to 555 DEG C with 155 DEG C/h of speed, be incubated 65 minutes; Be cooled to 325 DEG C with 135 DEG C/h of speed again, be incubated 2.5 hours; Again with 145 DEG C/h of ramp to 440 DEG C, be incubated 50 minutes, then with 145 DEG C/h of ramp to 515 DEG C, be incubated 2.5 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 pump case alloy steel material of the present invention is: tensile strength 1322MPa, yield strength 923.4MPa, unit elongation 15.1%, relative reduction in area 25.3%, impact absorbing energy 53.8J, impelling strength 60.1J/cm2, hardness 255HB.

Claims

1. a pump case 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 0.8-1.1, manganese 1.2-1.4, chromium 0.9-1.1, nickel 0.02-0.04, molybdenum 0.12-0.15, cobalt 0.03-0.05, aluminium 0.6-0.8, tungsten 0.05-0.08, titanium 0.02-0.04, boron 0.7-0.9, S≤0.04, P≤0.04, surplus are iron.

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

3. the production method of pump case alloy steel material according to claim 2, it is characterized in that: described casting postheat treatment is: first by room temperature with 150-160 DEG C/h of ramp to 660-670 DEG C, insulation 50-60 minute, 510-520 DEG C is cooled to again with 150-160 DEG C/h of speed, again with 200-210 DEG C/h of ramp to 930-940 DEG C, insulation 4-5 hour; 600-620 DEG C is cooled to again with 150-160 DEG C/h of speed, then with 170-180 DEG C/h of ramp to 730-740 DEG C, then be cooled to 550-560 DEG C with 150-160 DEG C/h of speed, insulation 60-70 minute; 320-330 DEG C is cooled to again, insulation 2-3 hour with 130-140 DEG C/h of speed; Again with 140-150 DEG C/h of ramp to 430-450 DEG C, insulation 40-60 minute, then with 140-150 DEG C/h of ramp to 510-520 DEG C, insulation 2-3 hour, takes out air cooling and get final product.

4. the production method of pump case 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.