CN103667986A - Anti-aging alloy steel material for valves and preparation method thereof - Google Patents
Anti-aging alloy steel material for valves and preparation method thereof Download PDFInfo
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- CN103667986A CN103667986A CN201310550351.5A CN201310550351A CN103667986A CN 103667986 A CN103667986 A CN 103667986A CN 201310550351 A CN201310550351 A CN 201310550351A CN 103667986 A CN103667986 A CN 103667986A
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Abstract
The invention relates to an anti-aging alloy steel material for valves, which contains the following chemical components in percentage by mass: 0.2-0.4% of carbon, 0.1-0.14% of silicon, 14-15% of nickel, 4-5% of chromium, 7.4-7.6% of magnesium, 1.8-1.9% of manganese, 0.5-0.8% of zirconium, 3.1-3.4% of molybdenum, at most 0.030% of P, at most 0.030% of S and the balance of iron. By using the combination of the nickel, magnesium, molybdenum and many other raw materials, the formed alloy steel has the characteristics of high strength, high hardness, favorable wear resistance and harsh environment resistance. Part of scrap iron is used as the raw material, and secondary refining is performed, so that the product quality is more stable and uniform and the material has lower contents of sulfur, phosphorus and other harmful elements. When the refining agent is used for casting production, the porosity in the casting is lowered by 1-2 degrees, and the oxide inclusions are lowered by 2 levels or so. The alloy steel is suitable for manufacturing valves for transmitting various gas-phase and liquid-phase substances, and the harsh environment resistance and service life are obviously improved.
Description
Technical field
The present invention relates to metallic substance preparation field, relate in particular to a kind of ageing-resistant alloy steel material for valve and preparation method thereof.
Background technology
The development of steel alloy has had the history of more than 100 year, up to the present, diversified steel alloy is employed industrial, mainly contains with Types Below: the steel alloy of the various excellent performances such as quenched and tempered steel, spring steel, roller bearing steel, tool steel, property steel, high temperature steel, low-temperature steel.
The steel alloy that pump valve is used has varied, technology has very much progress, but still has 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 a kind of ageing-resistant alloy steel material for valve and preparation method thereof, this alloy material has the advantages that hardness is high, intensity is high, adverse environment resistant corrodes.
Technical scheme of the present invention is as follows:
An ageing-resistant alloy steel material for valve, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 0.1-0.14, nickel 14-15, chromium 4-5, magnesium 7.4-7.6, manganese 1.8-1.9, zirconium 0.5-0.8, molybdenum 3.1-3.4, P≤0.030, S≤0.030, surplus are iron.
The production method of the described ageing-resistant alloy steel material for 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, magnesium; (2) nickel, molybdenum; (3) manganese, other remaining component of zirconium (4); The timed interval that each batch drops into element is 11-14 minute, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 230-250 ℃/h of speed, be warming up to 690-710 ℃, then be cooled to 570-590 ℃ with 160-175 ℃/h of speed, then continue to be warming up to 920-940 ℃ with 230-250 ℃/h of speed, insulation 3-4 hour; With 140-160 ℃/h of speed, be cooled to 720-750 ℃ again, insulation 40-60 minute, then with 140-160 ℃/h of speed, be cooled to 620-630 ℃, insulation 40-60 minute; With 100-120 ℃/h of speed, be cooled to 320-340 ℃ again, insulation 2-3 hour; With 150-170 ℃/h of speed, be warming up to 350-370 ℃ again, then be cooled to 200-230 ℃ with 70-90 ℃/h of speed, then be warming up to 540-555 ℃ with 140-160 ℃/h of speed, insulation 3-4 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 3-4, Repone K 5-8, Calcium Fluoride (Fluorspan) 3-5, Graphite Powder 99 5-8, Sodium Silicofluoride 8-10, jade powder 3-4, montmorillonite 1-2, lazurite 3-5, potassium felspar sand 3-5, titanium dioxide 1-2, diatomite in powder 3-4, Sodium Silicofluoride 1-2, SODIUMNITRATE 2-3; 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
The present invention is by using the plurality of raw materials such as nickel, magnesium, molybdenum to combine, proportioning raw materials and production technique are rationally set, input order is rationally set, rationally controls casting postheat treatment temperature, the steel alloy of formation has that high strength, high rigidity, wear resistance are good, the feature of adverse environment resistant; Use part scrap iron as raw material, and through secondary refining, make more stable uniform of quality, the harmful elements such as sulphur phosphorus are lower.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, is controlled effectively, and 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 applicable to manufacture the severe environment such as valve, acid and alkali-resistance, high temperature, carries various gas, liquid objects, and obviously extend work-ing life.
Embodiment
For an ageing-resistant alloy steel material for valve, chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 0.1-0.14, nickel 14-15, chromium 4-5, magnesium 7.4-7.6, manganese 1.8-1.9, zirconium 0.5-0.8, molybdenum 3.1-3.4, P≤0.030, S≤0.030, surplus are iron.
The production method of the described ageing-resistant alloy steel material for valve, is characterized in that:
(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, magnesium; (2) nickel, molybdenum; (3) manganese, other remaining component of zirconium (4); The timed interval that each batch drops into element is 13 minutes, after feeding intake, stirs.
Described casting postheat treatment is: first by room temperature, with 240 ℃/h of speed, be warming up to 700 ℃, then be cooled to 580 ℃ with 165 ℃/h of speed, then continue to be warming up to 930 ℃ with 240 ℃/h of speed, be incubated 3.5 hours; With 150 ℃/h of speed, be cooled to 740 ℃ again, be incubated 50 minutes, then be cooled to 625 ℃ with 150 ℃/h of speed, be incubated 50 minutes; With 110 ℃/h of speed, be cooled to 330 ℃ again, be incubated 2.5 hours; With 160 ℃/h of speed, be warming up to 360 ℃ again, then be cooled to 215 ℃ with 80 ℃/h of speed, then be warming up to 545 ℃ with 150 ℃/h of speed, be incubated 3.5 hours, take out air cooling and get final product.
Described refining agent by following weight part (kilogram) raw material make: instrument comminuted steel shot 3, Repone K 6, Calcium Fluoride (Fluorspan) 4, Graphite Powder 99 7, Sodium Silicofluoride 9, jade powder 3, montmorillonite 1.5, lazurite 4, potassium felspar sand 4, titanium dioxide 1.5, diatomite in powder 3.5, Sodium Silicofluoride 1.5, SODIUMNITRATE 2.5; Preparation method mixes each raw material, 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 3%, 2% nano-carbon powder, after mixing, under 11Mpa, be pressed into base, then, at 930 ℃, calcine 3.5 hours, cooling after, then be ground into 200 order powder, obtain.
The present invention for the mechanical property of the ageing-resistant alloy steel material of valve is: tensile strength 1380MPa, yield strength 973MPa, unit elongation 14%, relative reduction in area 25%, impact absorbing energy 56J, impelling strength 65.6J/cm2, hardness 295HB.
Claims (4)
1. for an ageing-resistant alloy steel material for valve, it is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, silicon 0.1-0.14, nickel 14-15, chromium 4-5, magnesium 7.4-7.6, manganese 1.8-1.9, zirconium 0.5-0.8, molybdenum 3.1-3.4, P≤0.030, S≤0.030, surplus are iron.
2. the production method of the ageing-resistant alloy steel material for 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, magnesium; (2) nickel, molybdenum; (3) manganese, other remaining component of zirconium (4); The timed interval that each batch drops into element is 11-14 minute, after feeding intake, stirs.
3. the production method of the ageing-resistant alloy steel material for valve according to claim 2, it is characterized in that: described casting postheat treatment is: first by room temperature, with 230-250 ℃/h of speed, be warming up to 690-710 ℃, with 160-175 ℃/h of speed, be cooled to 570-590 ℃ again, continue to be again warming up to 920-940 ℃ with 230-250 ℃/h of speed insulation 3-4 hour; With 140-160 ℃/h of speed, be cooled to 720-750 ℃ again, insulation 40-60 minute, then with 140-160 ℃/h of speed, be cooled to 620-630 ℃, insulation 40-60 minute; With 100-120 ℃/h of speed, be cooled to 320-340 ℃ again, insulation 2-3 hour; With 150-170 ℃/h of speed, be warming up to 350-370 ℃ again, then be cooled to 200-230 ℃ with 70-90 ℃/h of speed, then be warming up to 540-555 ℃ with 140-160 ℃/h of speed, insulation 3-4 hour, takes out air cooling and get final product.
4. the production method of the ageing-resistant alloy steel material for 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 3-4, Repone K 5-8, Calcium Fluoride (Fluorspan) 3-5, Graphite Powder 99 5-8, Sodium Silicofluoride 8-10, jade powder 3-4, montmorillonite 1-2, lazurite 3-5, potassium felspar sand 3-5, titanium dioxide 1-2, diatomite in powder 3-4, Sodium Silicofluoride 1-2, SODIUMNITRATE 2-3; 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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| CN201310550351.5A CN103667986A (en) | 2013-11-08 | 2013-11-08 | Anti-aging alloy steel material for valves and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104032238A (en) * | 2014-05-19 | 2014-09-10 | 安徽金大仪器有限公司 | Preparation method of corrosion preventing and impact resisting valve |
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| CN1095425A (en) * | 1994-03-23 | 1994-11-23 | 冶金工业部钢铁研究总院 | Austenitic heat-resistance steel |
| CN101063658A (en) * | 2006-04-29 | 2007-10-31 | 宝山钢铁股份有限公司 | Low-end correcting sample for spark source emission spectrographic analysis |
| 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 steel-smelting |
| TW201029776A (en) * | 2008-10-16 | 2010-08-16 | Uddeholm Tooling Ab | Steel material and a method for its manufacture |
| CN102218857A (en) * | 2011-05-27 | 2011-10-19 | 合肥金四达科技有限公司 | Composite material coated with SiC-Fe based alloy layer and preparation method of composite material |
| 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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2013
- 2013-11-08 CN CN201310550351.5A patent/CN103667986A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1095425A (en) * | 1994-03-23 | 1994-11-23 | 冶金工业部钢铁研究总院 | Austenitic heat-resistance steel |
| CN101063658A (en) * | 2006-04-29 | 2007-10-31 | 宝山钢铁股份有限公司 | Low-end correcting sample for spark source emission spectrographic analysis |
| 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 steel-smelting |
| TW201029776A (en) * | 2008-10-16 | 2010-08-16 | Uddeholm Tooling Ab | Steel material and a method for its manufacture |
| CN102218857A (en) * | 2011-05-27 | 2011-10-19 | 合肥金四达科技有限公司 | Composite material coated with SiC-Fe based alloy layer and preparation method of composite material |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104032238A (en) * | 2014-05-19 | 2014-09-10 | 安徽金大仪器有限公司 | Preparation method of corrosion preventing and impact resisting valve |
| CN104032238B (en) * | 2014-05-19 | 2016-02-10 | 安徽金大仪器有限公司 | A kind of preparation method of anticorrosion shock-resistant valve |
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