CN103643164A - Red-hardness high alloy steel material for pump valves and preparation method thereof - Google Patents
Red-hardness high alloy steel material for pump valves and preparation method thereof Download PDFInfo
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- CN103643164A CN103643164A CN201310558319.1A CN201310558319A CN103643164A CN 103643164 A CN103643164 A CN 103643164A CN 201310558319 A CN201310558319 A CN 201310558319A CN 103643164 A CN103643164 A CN 103643164A
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Abstract
A red-hardness high alloy steel material for pump valves comprises the following chemical element components by mass percent: 0.2-0.4% of carbon, 0.6-0.9% of silicon, 1.7-1.9% of manganese, 2.1-2.4% of molybdenum,1.6-1.8% of chromium, 0.02-0.04% of vanadium, 0.02-0.05% of nickel, 0.1-0.15% of niobium, 0.04-0.06% of Ta, not more than 0.04% of S, not more than 0.04% of P, and the balance of iron. The alloy steel of the invention not only has high hardness and good red hardness, but also has good toughness and good wear resistance. The method of the invention partly adopts scrap iron as a raw material; secondary refining is performed; and the comprehensive mechanical properties are improved. The alloy steel of the invention is suitable for high-wear rate parts used at high temperature, such as pump shafts, pipelines, valves and the like. The method of the invention adopts a refining agent in the casting production, which significantly improves the yield, especially reduces the degree of porosity in casting by 1-2 degrees, and controls the oxide inclusion level at about grade two.
Description
Technical field
The present invention relates to metallic substance preparation field, relate in particular to red hardness high quality steel material and preparation method thereof for a kind of pump valve.
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 wear resistance, hardness, rustless property, corrosion resistance nature, high and low temperature resistance, fragility, toughness etc., in a lot of occasions, can't meet the requirement of production, 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 red hardness high quality steel material and preparation method thereof for a kind of pump valve, this alloy material has advantages of that high rigidity, red hardness are good, shock-resistant, wear-resisting.
Technical scheme of the present invention is as follows:
A red hardness high quality steel material for pump valve, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 0.6-0.9, manganese 1.7-1.9, molybdenum 2.1-2.4, chromium 1.6-1.8, vanadium 0.02-0.04, nickel 0.02-0.05, niobium 0.1-0.15, Ta0.04-0.06, S≤0.04, P≤0.04, surplus are iron.
The production method of red hardness high quality steel material for described pump valve, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:1-2 ratio, the pig iron is added to 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 and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) silicon, nickel, chromium; (2) manganese, vanadium; (3) other remaining components; The timed interval that each batch drops into element is 23-26 minute, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 210-220 ℃/h of speed, be warming up to 500-510 ℃, insulation 60-70 minute, with 210-220 ℃/h of speed, be warming up to 700-710 ℃ again, insulation 60-70 minute, with 170-180 ℃/h of speed, be warming up to 925-940 ℃ again, insulation 3-4 hour; With 170-180 ℃/h of speed, be cooled to 600-610 ℃ again, then be warming up to 700-710 ℃ with 210-220 ℃/h of speed, then be cooled to 480-500 ℃ with 170-180 ℃/h of speed, insulation 70-80 minute; With 170-180 ℃/h of speed, be cooled to 220-230 ℃ again, insulation 2-3 hour; With 210-220 ℃/h of speed, be warming up to 330-350 ℃ again, then be cooled to 200-210 ℃ with 150-160 ℃/h of speed, then be warming up to 535-550 ℃ with 180-190 ℃/h of speed, insulation 2-3 hour, takes out air cooling and get final product.
Described refining agent is made by the raw material of following weight part: instrument comminuted steel shot 30-40, Tai-Ace S 150 3-4, fluorite 5-6, manganese oxide 1-2, Potassium tripolyphosphate 1-2, celestite powder 2-3, stalk ashes 1-2, jade powder 3-4, montmorillonite 1-2, SODIUMNITRATE 3-4, Calcium Fluoride (Fluorspan) 1-2; Preparation method mixes each raw material, 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 ℃, calcine 3-4 hour, cooling after, be ground into again 150-250 order powder, obtain.
Beneficial effect of the present invention
Steel alloy of the present invention not only has high hardness, and red hardness is good, but also has good toughness, and wear resisting property is good.The present invention uses part scrap iron as raw material, and through secondary refining, rationally controls casting postheat treatment temperature, and throwing raw materials, makes more stable uniform of alloy quality in batches, improves comprehensive mechanical property.Steel alloy of the present invention is applicable to the high parts of wear rate such as the pump shaft, pipeline, valve of high temperature service.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.
Embodiment
A red hardness high quality steel material for pump valve, chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 0.6-0.9, manganese 1.7-1.9, molybdenum 2.1-2.4, chromium 1.6-1.8, vanadium 0.02-0.04, nickel 0.02-0.05, niobium 0.1-0.15, Ta0.04-0.06, S≤0.04, P≤0.04, surplus are iron.
Described pump valve is as follows by the production method of red hardness high quality steel material:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:1.5 ratio, the pig iron is added to 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 and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) silicon, nickel, chromium; (2) manganese, vanadium; (3) other remaining components; The timed interval that each batch drops into element is 25 minutes, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 215 ℃/h of speed, be warming up to 505 ℃, be incubated 65 minutes, then be warming up to 705 ℃ with 215 ℃/h of speed, be incubated 65 minutes, then be warming up to 930 ℃ with 175 ℃/h of speed, be incubated 3.5 hours; With 175 ℃/h of speed, be cooled to 605 ℃ again, then be warming up to 705 ℃ with 215 ℃/h of speed, then be cooled to 490 ℃ with 175 ℃/h of speed, be incubated 76 minutes; With 176 ℃/h of speed, be cooled to 225 ℃ again, be incubated 2.4 hours; With 215 ℃/h of speed, be warming up to 340 ℃ again, then be cooled to 205 ℃ with 155 ℃/h of speed, then be warming up to 535-550 ℃ with 185 ℃/h of speed, be incubated 2.5 hours, take out air cooling and get final product.
Described refining agent by following weight part (kilogram) raw material make: instrument comminuted steel shot 35, Tai-Ace S 150 3.4, fluorite 5.5, manganese oxide 1.5, Potassium tripolyphosphate 1.5, celestite powder 2.5, stalk ashes 1.5, jade powder 3.5, montmorillonite 1.5, SODIUMNITRATE 3.5, Calcium Fluoride (Fluorspan) 1.5; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 170 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 3%, 2% nano-carbon powder, after mixing, under 13Mpa, be pressed into base, then, at 930 ℃, calcine 3.4 hours, cooling after, then be ground into 200 order powder, obtain.
Pump valve of the present invention by the mechanical property of red hardness high quality steel material is: tensile strength 1190MPa, yield strength 925MPa, unit elongation 15.8%, relative reduction in area 31%, impact absorbing energy 54J, impelling strength 64J/cm2, hardness 278HB.
Claims (4)
1. a red hardness high quality steel material for pump valve, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 0.6-0.9, manganese 1.7-1.9, molybdenum 2.1-2.4, chromium 1.6-1.8, vanadium 0.02-0.04, nickel 0.02-0.05, niobium 0.1-0.15, Ta0.04-0.06, S≤0.04, P≤0.04, surplus are iron.
2. the production method of red hardness high quality steel material for pump valve according to claim 1, is characterized in that:
(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:1-2 ratio, the pig iron is added to 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 and adjust chemical element component content to qualified, casting, casting postheat treatment etc.;
(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) silicon, nickel, chromium; (2) manganese, vanadium; (3) other remaining components; The timed interval that each batch drops into element is 23-26 minute, after feeding intake, stirs.
3. the production method of red hardness high quality steel material for pump valve according to claim 2, it is characterized in that: described casting postheat treatment is: first by room temperature, with 210-220 ℃/h of speed, be warming up to 500-510 ℃, insulation 60-70 minute, with 210-220 ℃/h of speed, be warming up to 700-710 ℃ again, insulation 60-70 minute, with 170-180 ℃/h of speed, be warming up to 925-940 ℃ again, insulation 3-4 hour; With 170-180 ℃/h of speed, be cooled to 600-610 ℃ again, then be warming up to 700-710 ℃ with 210-220 ℃/h of speed, then be cooled to 480-500 ℃ with 170-180 ℃/h of speed, insulation 70-80 minute; With 170-180 ℃/h of speed, be cooled to 220-230 ℃ again, insulation 2-3 hour; With 210-220 ℃/h of speed, be warming up to 330-350 ℃ again, then be cooled to 200-210 ℃ with 150-160 ℃/h of speed, then be warming up to 535-550 ℃ with 180-190 ℃/h of speed, insulation 2-3 hour, takes out air cooling and get final product.
4. the production method of red hardness high quality steel material for pump valve according to claim 2, is characterized in that: described refining agent is made by the raw material of following weight part: instrument comminuted steel shot 30-40, Tai-Ace S 150 3-4, fluorite 5-6, manganese oxide 1-2, Potassium tripolyphosphate 1-2, celestite powder 2-3, stalk ashes 1-2, jade powder 3-4, montmorillonite 1-2, SODIUMNITRATE 3-4, Calcium Fluoride (Fluorspan) 1-2; Preparation method mixes each raw material, 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 ℃, calcine 3-4 hour, cooling after, be ground into again 150-250 order powder, obtain.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213042A (en) * | 2014-08-05 | 2014-12-17 | 安徽荣达阀门有限公司 | Alloy steel material for pump shell and manufacturing method thereof |
| CN104213045A (en) * | 2014-08-05 | 2014-12-17 | 安徽荣达阀门有限公司 | Alloy steel material for high-temperature operation pump valve and preparing method of alloy steel material |
| CN104213031A (en) * | 2014-08-05 | 2014-12-17 | 安徽荣达阀门有限公司 | High-temperature resistant alloy steel material for pump valve and preparation method thereof |
| CN104213021A (en) * | 2014-08-05 | 2014-12-17 | 安徽荣达阀门有限公司 | Wear resistant high-carbon steel pump valve material and preparation method thereof |
| CN104213027A (en) * | 2014-08-05 | 2014-12-17 | 安徽荣达阀门有限公司 | Stainless steel material for pump valve and manufacturing method thereof |
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| CN101177721A (en) * | 2006-11-10 | 2008-05-14 | 攀钢集团攀枝花钢铁研究院 | Multifunctional composite refining agent for steelmaking |
| CN101886225A (en) * | 2010-07-07 | 2010-11-17 | 南京信息工程大学 | Corrosion-resistant and abrasion-resistant steel and preparation method thereof |
| CN102409138A (en) * | 2011-10-31 | 2012-04-11 | 芜湖山桥铁路器材有限公司 | Process for manufacturing alloy steel for rail frog |
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Patent Citations (6)
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| JPS63171856A (en) * | 1987-01-09 | 1988-07-15 | Hitachi Ltd | Heat-resisting steel and gas turbine using same |
| JP2007239095A (en) * | 2006-02-10 | 2007-09-20 | Nippon Steel Corp | Acid corrosion resistant steel |
| CN101177721A (en) * | 2006-11-10 | 2008-05-14 | 攀钢集团攀枝花钢铁研究院 | Multifunctional composite refining agent for steelmaking |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213042A (en) * | 2014-08-05 | 2014-12-17 | 安徽荣达阀门有限公司 | Alloy steel material for pump shell and manufacturing method thereof |
| CN104213045A (en) * | 2014-08-05 | 2014-12-17 | 安徽荣达阀门有限公司 | Alloy steel material for high-temperature operation pump valve and preparing method of alloy steel material |
| CN104213031A (en) * | 2014-08-05 | 2014-12-17 | 安徽荣达阀门有限公司 | High-temperature resistant alloy steel material for pump valve and preparation method thereof |
| CN104213021A (en) * | 2014-08-05 | 2014-12-17 | 安徽荣达阀门有限公司 | Wear resistant high-carbon steel pump valve material and preparation method thereof |
| CN104213027A (en) * | 2014-08-05 | 2014-12-17 | 安徽荣达阀门有限公司 | Stainless steel material for pump valve and manufacturing method thereof |
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Application publication date: 20140319 |