CN104726759A - Production method of as-cast high-strength gray cast iron - Google Patents
Production method of as-cast high-strength gray cast iron Download PDFInfo
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- CN104726759A CN104726759A CN201310722643.2A CN201310722643A CN104726759A CN 104726759 A CN104726759 A CN 104726759A CN 201310722643 A CN201310722643 A CN 201310722643A CN 104726759 A CN104726759 A CN 104726759A
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Abstract
The invention relates to a production method of as-cast high-strength gray cast iron. The production process comprises the following steps: sequentially adding returning iron, steel scrap, manganese iron, a carburizing agent, chromium iron, silicon iron, a resulfurization agent and antimony regulus into a medium-frequency induction furnace; after all the materials are molten, removing slag and inspecting the original molten iron composition, wherein the molten iron in the furnace is directly heated and stood if the composition is acceptable, and the composition is adjusted to the acceptable state and the molten iron is heated and stood if the composition is not acceptable; when the temperature of the molten iron drops to 1440-1460 DEG C, tapping to a casting ladle filled with a silicon-barium inoculant; inoculating in the casting ladle, removing slag, and preparing for casting; and controlling the casting temperature at 1310-1330 DEG C to form the final casting. Manganese, chromium and an antimony alloy are introduced in the smelting process to promote the formation and refinement of the pearlite; and the added resulfurization agent can improve the graphite form. The strength of the cast test block is stable at 350 MPa above. The as-cast high-strength gray cast iron comprises the following chemical components: 2.80%-2.95% of C, 1.70%-1.80% of Si, 0.80%-1.10% of Mn, 0.065%-0.080% of S, 0.030%-0.045% of P, 0.250%-0.530% of Cr, a trace amount of Sb and the balance of Fe.
Description
Art
The present invention relates to a kind of production method of graphitic cast iron, specifically, relate to the production method of a kind of large-tonnage, large wall thickness high-strength gray cast iron part.
Background technology
Along with the development of national economy continued smooth, the development of equipment manufacture and production technology upgrading, domestic Machine Tool Industry is occurred good situation, the application of following machine industry in fields such as boats and ships, space flight, traffic is by sustainable growth.On the other hand, the development of machine industry also proposes requirements at the higher level to machine mass, the favor that working accuracy is high, the lathe of good stability is subject to client more.
Because foundry goods occupies more than 70% in lathe proportion, thus, the quality of foundry goods is even more important for machine mass stability.Lathe bed, crossbeam, column etc. are the key components of heavy heavy duty machine tools, and this kind of foundry goods is higher to the performance requriements such as intensity and hardness.But the gray iron casting tonnages such as the lathe bed of heavy machine tool, crossbeam, column are heavy, section is greatly thick, and speed of cooling is slow, and easily occur inoculation fade, graphite is thick, and content of pearlite in alloy is not enough, the foundry goods producing high strength requirement is quite difficult.
Summary of the invention
The object of the invention is to utilize the elements such as manganese, chromium, antimony to carry out alloy strengthening, and add a small amount of increasing sulphur agent, promote heterogeneous forming core, improve graphite form, thus improve the intensity of thick large gray iron casting.
The production process of the present invention's said as cast condition high-strength gray cast iron production method is as follows:
1, successively foundry return, steel scrap, ferromanganese, carburelant, ferrochrome, ferrosilicon, the agent of increasing sulphur, antimony regulus are added medium-frequency induction furnace.
2, all load melting after, skim in stove and check base iron composition,
1) if composition is qualified, leave standstill after molten iron in stove being directly warmed up to 1460 DEG C ~ 1480 DEG C;
2) if off analysis, then adjusting component is to qualified, then it is standing to heat up.
3, when bonded hard ferrite magnet drops to 1440 DEG C ~ 1460 DEG C, tap a blast furnace to casting ladle, put into the casting ladle of silicon titanate innoculant.
4, just skim in bag after breeding in bag, then prepare cast; Teeming temperature controls at 1310 DEG C ~ 1330 DEG C.
5, form final casting, its chemical composition is carbon C:2.80% ~ 2.95%, silicon Si:1.70% ~ 1.80%, manganese Mn:0.80% ~ 1.10%, sulphur S:0.065% ~ 0.080%, phosphorus P:0.030% ~ 0.045%, chromium Cr:0.250% ~ 0.530%, antimony Sb: trace, surplus mainly iron Fe.
Said foundry return and steel scrap are the main raw material of melting, and the mass percent of the two is: foundry return 70% ~ 65%, steel scrap 30% ~ 35%.Ferromanganese is 65 ferromanganese, and ferrochrome is 60 ferrochrome, and ferrosilicon is 75 ferrosilicon.
Said composition qualified finger carbon C:2.80% ~ 2.95%, silicon Si:1.55% ~ 1.65%, manganese Mn:0.80% ~ 1.10%, sulphur S:0.060% ~ 0.090%, phosphorus P:0.030% ~ 0.050%.The present invention's said as cast condition high-strength gray cast iron production method, have employed suitable chemical composition and charge composition, and have employed suitable production technique.Due to the alloying action of manganese, chromium and antimony element, facilitate pearlitic formation, and make Fining of Pearlite, the perlite grade of foundry goods is stabilized in more than 98%; Add a small amount of increasing sulphur agent simultaneously, promote heterogeneous forming core, improve graphite form.The test block of the foundry goods utilizing the said processing condition and method of the present invention to produce, its intensity stabilization is at more than 350MPa.
Embodiment
Embodiment 1
Be the foundry return of 65% and the steel scrap of 35% by weight percent, drop into medium-frequency induction furnace, treat load meltingly to reach 85% ~ 90%, successively ferromanganese, carburelant, ferrochrome, ferrosilicon, the agent of increasing sulphur, antimony regulus are added medium-frequency induction furnace.All load melting after, skim in stove, utilize both analysis instrument and spectrum analyzer to detect hot metal composition after skimming, base iron composition is C:3.01%, Si:1.61%, Mn:0.89%, S:0.059%, P:0.045%.In base iron, carbon content is too high, therefore, in medium-frequency induction furnace, add 1 ton of steel scrap, then power is sent to heat up the scrap melting that will add, again chemically examine molten iron qualified after, molten iron is warmed up to 1480 DEG C of superheating and standing, taps a blast furnace when temperature drops to 1460 DEG C, now insert silicon titanate innoculant in casting ladle, breed after reaction completes, skim in bag immediately, molten iron temperature is 1310 DEG C of cast.
The chemical composition of the test block obtained is C:2.91%, Si:1.78%, Mn:0.91%, S:0.066%, P:0.041%, Cr:0.396%, Sb: trace, surplus mainly iron Fe, tensile strength is 385MPa.
Embodiment 2
Be the foundry return of 70% and the steel scrap of 30% by mass percent, drop into medium-frequency induction furnace, treat load meltingly to reach 85% ~ 90%, successively ferromanganese, carburelant, ferrochrome, ferrosilicon, the agent of increasing sulphur, antimony regulus are added medium-frequency induction furnace.All load melting after, skim in stove, utilize both analysis instrument and spectrum analyzer to detect hot metal composition after skimming, base iron composition is C:2.90%, Si:1.60%, Mn:1.06%, S:0.085%, P:0.047%, and base iron composition is qualified, directly molten iron is warmed up to 1469 DEG C of superheating and standing, tap a blast furnace when temperature drops to 1448 DEG C, now insert silicon titanate innoculant in casting ladle, breed after reaction completes, skim in bag immediately, molten iron temperature is 1327 DEG C of cast.
The chemical composition of the test block obtained is C:2.85%, Si:1.72%, Mn:1.04%, S:0.080%, P:0.043%, Cr:0.253%, Sb: trace, surplus mainly iron Fe, tensile strength is 365MPa.
Embodiment 3
Be the foundry return of 70% and the steel scrap of 30% by weight percent, drop into medium-frequency induction furnace, treat load meltingly to reach 85% ~ 90%, successively ferromanganese, carburelant, ferrochrome, ferrosilicon, the agent of increasing sulphur, antimony regulus are added medium-frequency induction furnace.All load melting after, skim in stove, both analysis instrument and spectrum analyzer is utilized to detect hot metal composition after skimming, base iron composition is C:2.89%, Si:1.50%, Mn:0.82%, S:0.081%, P:0.035%, because silicon content is on the low side, during feed supplement, add 40 kilograms of ferrosilicon, and then molten iron is warmed up to 1462 DEG C of superheating and standing, tap a blast furnace when temperature drops to 1440 DEG C, now insert silicon titanate innoculant in casting ladle, breed after reaction completes, skim in bag immediately, molten iron temperature is 1318 DEG C of cast.
The chemical composition of the test block obtained is C:2.93%, Si:1.80%, Mn:0.80%, S:0.076%, P:0.037%, Cr:0.465%, Sb: trace, surplus mainly iron Fe, tensile strength is 355MPa.
Embodiment 4
Be the foundry return of 68% and the steel scrap of 32% by weight percent, drop into medium-frequency induction furnace, treat load meltingly to reach 85% ~ 90%, successively ferromanganese, carburelant, ferrochrome, ferrosilicon, the agent of increasing sulphur, antimony regulus are added medium-frequency induction furnace.All load melting after, skim in stove, utilize both analysis instrument and spectrum analyzer to detect hot metal composition after skimming, base iron composition is C:2.81%, Si:1.65%, Mn:1.07%, S:0.064%, P:0.033%, and base iron composition meets target value requirement, directly molten iron is warmed up to 1473 DEG C of superheating and standing, tap a blast furnace when temperature drops to 1452 DEG C, now insert silicon titanate innoculant in casting ladle, breed after reaction completes, skim in bag immediately, molten iron temperature is 1330 DEG C of cast.
The chemical composition of the test block obtained is C:2.80%, Si:1.76%, Mn:1.08%, S:0.066%, P:0.034%, Cr:0.527%, Sb: trace, surplus mainly iron Fe, tensile strength is 360MPa.
Claims (6)
1. an as cast condition high-strength gray cast iron production method, utilize foundry return, steel scrap for melting raw material, be aided with alloyed feedstock, its production process is:
1) successively foundry return, steel scrap, ferromanganese, carburelant, ferrochrome, ferrosilicon, the agent of increasing sulphur, antimony regulus are added medium-frequency induction furnace;
2) when all load melting after, skim in stove and check base iron composition,
(1) if composition is qualified, leave standstill after directly molten iron in stove being warmed up to 1460 DEG C ~ 1480 DEG C;
(2) if off analysis, then adjusting component is to qualified, then it is standing to heat up;
3) when bonded hard ferrite magnet drops to 1440 DEG C ~ 1460 DEG C.Tap a blast furnace to casting ladle, put into the casting ladle of silicon titanate innoculant;
4) after breeding in casting ladle, just skim in casting ladle, then prepare cast; Teeming temperature controls at 1310 DEG C ~ 1330 DEG C;
5) form final casting, its chemical composition is carbon C:2.80% ~ 2.95%, silicon Si:1.70% ~ 1.80%, manganese Mn:0.80% ~ 1.10%, sulphur S:0.065% ~ 0.080%, phosphorus P:0.030% ~ 0.045%, chromium Cr:0.250% ~ 0.530%, antimony Sb: trace, surplus are iron Fe.
2. according to the said high-strength gray cast iron production method of claim 1, it is characterized in that, the mass percent of said foundry return and steel scrap is: foundry return 70% ~ 65%, steel scrap 30% ~ 35%.
3. according to the said high-strength gray cast iron production method of claim 1, it is characterized in that, said ferromanganese is 65 ferromanganese.
4. according to the said high-strength gray cast iron production method of claim 1, it is characterized in that, said ferrochrome is 60 ferrochrome.
5. according to the said high-strength gray cast iron production method of claim 1, it is characterized in that, said ferrosilicon is 75 ferrosilicon.
6. according to the said high-strength gray cast iron production method of claim 1, it is characterized in that, said composition qualified finger carbon C:2.80% ~ 2.95%, silicon Si:1.55% ~ 1.65%, manganese Mn:0.80% ~ 1.10%, sulphur S:0.060% ~ 0.090%, phosphorus P:0.030% ~ 0.050%.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086605A (en) * | 2016-06-23 | 2016-11-09 | 含山县朝霞铸造有限公司 | A kind of preparation technology being applicable to Bearing gear pearlite casting pig |
| CN107587032A (en) * | 2017-10-30 | 2018-01-16 | 太湖县爱杰机械铸造有限公司 | A kind of formula and its method of smelting of high manganese gray cast iron |
| CN108707715A (en) * | 2018-04-24 | 2018-10-26 | 上柴动力海安有限公司 | A kind of body anti-rust metal smelting technology |
| CN111254249A (en) * | 2020-03-23 | 2020-06-09 | 苏州勤堡精密机械有限公司 | Method for producing high-strength thick gray cast iron |
| CN111850381A (en) * | 2020-07-14 | 2020-10-30 | 驻马店中集华骏铸造有限公司 | Method for producing gray cast iron |
| CN112226669A (en) * | 2020-08-28 | 2021-01-15 | 江苏衢科轨道交通科技有限公司 | Preparation process of EVO cylinder reinforcing sleeve of train |
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| CN102251165A (en) * | 2011-07-07 | 2011-11-23 | 无锡小天鹅精密铸造有限公司 | Smelting composition for crank shaft |
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Patent Citations (6)
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| JP2007245217A (en) * | 2006-03-17 | 2007-09-27 | Kubota Corp | Composite rolling mill roll |
| RU2361001C1 (en) * | 2008-02-28 | 2009-07-10 | Юлия Алексеевна Щепочкина | Cast iron |
| CN101823139A (en) * | 2009-03-03 | 2010-09-08 | 上海华新合金有限公司 | Casting method of low-alloy hydraulic pump stator casting |
| CN102451904A (en) * | 2010-11-01 | 2012-05-16 | 上海华新合金有限公司 | Casting method of body casting of centrifugal air compressor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086605A (en) * | 2016-06-23 | 2016-11-09 | 含山县朝霞铸造有限公司 | A kind of preparation technology being applicable to Bearing gear pearlite casting pig |
| CN107587032A (en) * | 2017-10-30 | 2018-01-16 | 太湖县爱杰机械铸造有限公司 | A kind of formula and its method of smelting of high manganese gray cast iron |
| CN108707715A (en) * | 2018-04-24 | 2018-10-26 | 上柴动力海安有限公司 | A kind of body anti-rust metal smelting technology |
| CN111254249A (en) * | 2020-03-23 | 2020-06-09 | 苏州勤堡精密机械有限公司 | Method for producing high-strength thick gray cast iron |
| CN111850381A (en) * | 2020-07-14 | 2020-10-30 | 驻马店中集华骏铸造有限公司 | Method for producing gray cast iron |
| CN112226669A (en) * | 2020-08-28 | 2021-01-15 | 江苏衢科轨道交通科技有限公司 | Preparation process of EVO cylinder reinforcing sleeve of train |
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Application publication date: 20150624 |