CN103667957A - ZG25MnSY6 casting material and method for preparing casting - Google Patents
ZG25MnSY6 casting material and method for preparing casting Download PDFInfo
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- CN103667957A CN103667957A CN201310557882.7A CN201310557882A CN103667957A CN 103667957 A CN103667957 A CN 103667957A CN 201310557882 A CN201310557882 A CN 201310557882A CN 103667957 A CN103667957 A CN 103667957A
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Abstract
The invention discloses a ZG25MnSY6 casting material. The ZG25MnSY6 casting material consists of the following components by mass percent: 0.15-0.2% of C, 0.3-0.45% of Si, 0.8-1.1% of Mn, less than or equal to 0.01% of S, less than or equal to 0.015% of P, less than or equal to 0.06% of Al, 0.6-0.9% of Cr, 1-1.2% of Ni, 0.3-0.5% of Mo, 0.1-0.15% of V and the balance of Fe, 100% in total. The invention also discloses a method for preparing a casting by using the ZG25MnSY6 material. According to the casting material, a certain alloying element is reduced or increased, smelting is carried out in an electric-arc furnace and refining furnace, an alterant is added in the later refining stage and heat treatment is carried out, so that the metallographic structure of the casting is good, the mechanical property of the casting is greatly improved, the strength and toughness are enhanced, and the service time of the casting is prolonged.
Description
Technical field
The invention belongs to cast material technical field, relate to a kind of ZG25MnSY6 casting material, the invention still further relates to and utilize this kind of ZG25MnSY6 material to prepare the method for foundry goods.
Background technology
Development along with foundry engieering, performance requriements to foundry goods is more and more higher, this just requires foundry goods will have good material, good metallographic structure and higher mechanical property, and guarantee foundry goods is wear-resisting, antifatigue in use, guarantees that foundry goods does not in use deform, ruptures.Especially in the colliery of underground coal mining, the continuity work of the security of foundry goods to the safety of operator's life, equipment operation, has all played vital effect.
Summary of the invention
The object of this invention is to provide a kind of ZG25MnSY6 casting material, solved existing foundry goods in use wear-resisting, fatigue performance is not enough, the problem that in use easily deforms, ruptures.
Another object of the present invention is to provide a kind ofly utilizes this kind of ZG25MnSY6 material to prepare the method for foundry goods.
The technical solution adopted in the present invention is that a kind of ZG25MnSY6 casting material, is comprised of according to quality % following component: C is 0.15%-0.2%, Si is 0.3%-0.45%, and Mn is that 0.8%～1.1%, S is≤0.01%, P is≤0.015%, Al is that≤0.06%, Cr is 0.6%-0.9%, and Ni is 1%-1.2%, Mo is 0.3%-0.5%, V is 0.1%～0.15%, and all the other are Fe, adds up to 100%.
Another technical scheme of the present invention is, a kind of method of utilizing above-mentioned ZG25MnSY6 material to prepare foundry goods, and concrete steps comprise:
Step 1, utilize EBT electric furnace to carry out just refining
1.1) Composition Control: should meet C≤0.15%, P≤0.005% during electric furnace steel tapping;
1.2) select few, the low P of impurity, the high-quality steel scrap of S, stub bar
Melt and guarantee that clearly remnants meet processing requirement, it is 4～5% of Metal Weight that the first tank material is allocated lime into; In time a large amount of slagging oxidation period and add slag charge, P≤0.005% while guaranteeing to tap;
1.3) adopt and stay steel remaining slag operation, stay steel amount 5～7t, forbid oxidation sludge to enter refining bag;
1.4) first furnace tapping temperature: 1650～1680 ℃, use strong reductor for 0.5Kg/t steel during pre-deoxidation operation;
Step 2, utilize LF refining furnace to carry out refining
2.1) after refining bag being hung on buggy ladle, carry out as early as possible argon replaces, standby comprising assured in refining:
2.1.1) check each position of refining bag, confirm that each position is normal;
2.1.2) refining bag is cleaned out, and cylinder-packing is without steel scrap, without dry slag, and slag line is mended area by replacing a damaged part and is not more than 50% of slag line area, installs slide gate nozzle, and confirming mechanism is in good working state;
2.1.3) check residual height and the ventilation property of gas permeable brick;
2.2) refining bag is delivered to after refining station, thermometric, added slag charge
Slag charge forms: lime: the ratio that fluorite is 4～5:1 according to mass ratio is mixed, and is controlled at 200 ± 10mm after refinery scum;
2.3) diffusion deoxidizer is selected C powder, ferrosilicon powder, silicon calcium powder and aluminium powder, diffusion deoxidizer will add in batches, treat that slag bleaches, viscosity is suitable, after thermometric sampling, according to analytical results, liquid steel temperature is raised to >=adjust alloying constituent after 1620 ± 10 ℃, after alloying, again temperature is raised to 1590 ± 10 ℃, and get total analysis sample;
2.4) in refining later stage stove, to keep pressure-fired, continue to add diffusion deoxidizer, keep reducing atmosphere;
2.5) refining time is not less than 45 minutes, requires refining white slag hold-time >=20 minute after above-mentioned alloy compositions adds, and adds ferro-vanadium before tapping;
2.6) refining furnace tapping temperature: 1585 ± 10 ℃;
Step 3, pour into a mould
It is 1550 ± 10 ℃ that cast requires cryogenic fast injection, teeming temperature, and it is complete that foundry goods is pressed foundary methods drawing moulding simultaneously, by the cast of pouring technology temperature, obtains ZG25MnSY6 foundry goods after casting parts thermal insulation, shake out, finishing;
Step 4, ZG25MnSY6 foundry goods is carried out to modifier treatment.
The invention has the beneficial effects as follows, by contrasting existing casting material, by reducing and increase certain alloying element, pass through electric arc furnace and refining furnace melting and add alterant in the refining later stage, guarantee foundry goods Chemical Composition, by reasonable, suitable thermal treatment process, make the good metallographic structure that obtains of foundry goods, and foundry goods mechanical property is significantly improved, improve intensity and the toughness of foundry goods, reduce foundry goods parts replacement frequency, extend foundry goods duration of service, increase work efficiency and meet safety requirements
Embodiment
Below in conjunction with embodiment, the present invention is described in detail.
ZG25MnSY6 material of the present invention, is comprised of according to quality % following component:
C is 0.15%-0.2%, and Si is 0.3%-0.45%, and Mn is that 0.8%～1.1%, S is that≤0.01%, P is that≤0.015%, Al is that≤0.06%, Cr is 0.6%-0.9%, and Ni is 1%-1.2%, and Mo is 0.3%-0.5%, and V is 0.1%～0.15%, and all the other are Fe, adds up to 100%.
Table 1, ZG25MnSY6 organizes design requirements performance index
With reference to table 1, be ZG25MnSY6 casting material of the present invention organize design requirements performance index.
The present invention utilizes above-mentioned ZG25MnSY3 material to prepare the method for foundry goods, comprise just refine → LF of electric furnace refining → cast → thermal treatment process, each component is added successively in smelting process, carries out final chemical composition mass percent and controls, and specifically according to following steps, implements:
Step 1, utilize EBT electric furnace to carry out just refining
1.1) Composition Control (element mass content %): chemical composition is qualified when guaranteeing LF refining, should meet C≤0.15%, P≤0.005% during electric furnace steel tapping;
1.2) select high-quality steel scrap, the stub bar (getting Fe and P, S wherein) of few, the low P of impurity, S
Melt and guarantee that clearly remnants meet processing requirement, it is 4～5% of Metal Weight that the first tank material is allocated lime into; In time a large amount of slagging oxidation period and add slag charge, P≤0.005% while guaranteeing to tap;
1.3) adopt and stay steel remaining slag operation, stay steel amount 5～7t, forbid oxidation sludge to enter refining bag.
1.4) first furnace tapping temperature: 1650～1680 ℃, using strong reductor (such as Al) during pre-deoxidation operation is 0.5Kg/t steel.
Step 2, utilize LF refining furnace to carry out refining
2.1) after refining bag being hung on buggy ladle, carry out as early as possible argon replaces
Standby comprising assured in refining:
2.1.1) check each position of refining bag, confirm that each position is normal;
2.1.2) refining bag must be cleaned out, and cylinder-packing is without steel scrap, without dry slag.Slag line is mended area by replacing a damaged part and is not more than 50% of slag line area, must not use new block bag or the new bag ladle at the end of changing; Install slide gate nozzle, confirming mechanism is in good working state;
2.1.3) check residual height and the ventilation property of gas permeable brick, guarantee residual high safety, ventilative good.Before refining bag is used, must toast good;
2.2) refining bag is delivered to after refining station, thermometric, added slag charge
Slag charge forms: lime: the ratio that fluorite is 4～5:1 according to mass ratio is mixed, and is controlled at 200 ± 10mm after refinery scum;
2.3)) diffusion deoxidizer is selected C powder, ferrosilicon powder, silicon calcium powder and aluminium powder, in order to guarantee furnace reduction atmosphere, diffusion deoxidizer will add in batches, treat that slag bleaches, viscosity is suitable, after thermometric sampling, according to analytical results, liquid steel temperature is raised to >=adjust alloying constituent after 1620 ℃, after alloying, again temperature is raised to 1590 ± 10 ℃, gets total analysis sample;
2.4) in refining later stage stove, to keep pressure-fired, continue to add diffusion deoxidizer, keep reducing atmosphere.In refining process, constantly observe argon gas situation, adjust argon pressure and flow in good time, with not exposed molten steel face, be advisable;
2.5) refining time is not less than 45 minutes, requires refining white slag hold-time >=20 minute after above-mentioned alloy compositions adds, and adds ferro-vanadium before tapping;
2.6) refining furnace tapping temperature: 1585 ± 10 ℃.Since then, casting quality composition all meets design requirements, and wherein four embodiment heats (four stove steel) ultimate constituent is with reference to showing 2-1 to showing 2-4;
Table 2-1, and the ultimate constituent table of the embodiment of the present invention 1 (element mass content, %)
| C | Si | Mn | S | P |
| 0.16 | 0.44 | 0.9 | 0.009 | 0.013 |
| Al | Cr | Ni | Mo | V |
| 0.04 | 0.68 | 1.12 | 0.38 | 0.13 |
Table 2-2, and the ultimate constituent table of the embodiment of the present invention 2 (element mass content, %)
| C | Si | Mn | S | P |
| 0.18 | 0.41 | 0.92 | 0.005 | 0.014 |
| Al | Cr | Ni | Mo | V |
| 0.05 | 0.79 | 1.18 | 0.46 | 0.12 |
Table 2-3, and the ultimate constituent table of the embodiment of the present invention 3 (element mass content, %)
| C | Si | Mn | S | P |
| 0.16 | 0.35 | 1.08 | 0.007 | 0.014 |
| Al | Cr | Ni | Mo | V |
| 0.04 | 0.82 | 1.15 | 0.33 | 0.14 |
Table 2-4, and the ultimate constituent table of the embodiment of the present invention 4 (element mass content, %)
| C | Si | Mn | S | P |
| 0.19 | 0.42 | 1.1 | 0.005 | 0.010 |
| Al | Cr | Ni | Mo | V |
| 0.03 | 0.87 | 1.08 | 0.47 | 0.12 |
Step 3, pour into a mould
It is 1550 ± 10 ℃ that cast requires cryogenic fast injection, teeming temperature, and it is complete that foundry goods is pressed foundary methods drawing moulding simultaneously, by the cast of pouring technology temperature, obtains ZG25MnSY6 foundry goods after casting parts thermal insulation, shake out, finishing.
Step 4, ZG25MnSY6 foundry goods is carried out to modifier treatment
Modifier treatment is generally carried out after positive tempering, now cast casting stress and normalizing stress are eliminated, technological process is: first, 350 ℃ ± 10 ℃ insulations 1 ± 0.1 hour, then heat-up rate is controlled at≤60 ℃/h, is warmed up to 650 ℃ ± 10 ℃ insulations 1 ± 0.1 hour; Again heat-up rate is controlled at≤70 ℃/h, is warmed up to 940 ℃ ± 10 ℃ insulations 1 ± 0.1 hour, during soaking time shorter, heat-up rate is very fast, while reaching 940 ℃ of processing requirements, foundry goods is pulled out to heat treatment furnace, puts into 20# machine oil pond cooling;
After foundry goods is cooling, again heat-up rate is controlled at≤60 ℃/h, is warmed up to 350 ℃ ± 10 ℃ insulations 1 ± 0.1 hour; Again heat-up rate is controlled at≤70 ℃/h, is warmed up to 600 ℃ ± 10 ℃ insulations 3 ± 0.2 hours, the thermal treatment of tempering stress-removal, last air cooling is to room temperature.
After tempering finishes, cut attached casting testing material on foundry goods, be processed into tension specimen of standard and three impact specimens, by standard, through row performance test and hardness test, through experimental test, final performance is as shown in table 3, meets design requirements.
Table 3, ZG25MnSY6 structure property actual measurement index
In sum, ZG25MnSY6 material of the present invention and foundry goods thereof meet design requirements, have good mechanical property, have a good application prospect.
Claims (3)
1. a ZG25MnSY6 casting material, its feature is, following component, according to quality %, consists of: C is 0.15%-0.2%, Si is 0.3%-0.45%, and Mn is that 0.8%～1.1%, S is≤0.01%, P is≤0.015%, Al is that≤0.06%, Cr is 0.6%-0.9%, and Ni is 1%-1.2%, Mo is 0.3%-0.5%, V is 0.1%～0.15%, and all the other are Fe, adds up to 100%.
2. utilize ZG25MnSY6 material described in claim 1 to prepare a method for foundry goods, its feature is, concrete steps comprise:
Step 1, utilize EBT electric furnace to carry out just refining
1.1) Composition Control: should meet C≤0.15%, P≤0.005% during electric furnace steel tapping;
1.2) select few, the low P of impurity, the high-quality steel scrap of S, stub bar
Melt and guarantee that clearly remnants meet processing requirement, it is 4～5% of Metal Weight that the first tank material is allocated lime into; In time a large amount of slagging oxidation period and add slag charge, P≤0.005% while guaranteeing to tap;
1.3) adopt and stay steel remaining slag operation, stay steel amount 5～7t, forbid oxidation sludge to enter refining bag;
1.4) first furnace tapping temperature: 1650～1680 ℃, use strong reductor for 0.5Kg/t steel during pre-deoxidation operation;
Step 2, utilize LF refining furnace to carry out refining
2.1) after refining bag being hung on buggy ladle, carry out as early as possible argon replaces, standby comprising assured in refining:
2.1.1) check each position of refining bag, confirm that each position is normal;
2.1.2) refining bag is cleaned out, and cylinder-packing is without steel scrap, without dry slag, and slag line is mended area by replacing a damaged part and is not more than 50% of slag line area, installs slide gate nozzle, and confirming mechanism is in good working state;
2.1.3) check residual height and the ventilation property of gas permeable brick;
2.2) refining bag is delivered to after refining station, thermometric, added slag charge
Slag charge forms: lime: the ratio that fluorite is 4～5:1 according to mass ratio is mixed, and is controlled at 200 ± 10mm after refinery scum;
2.3)) diffusion deoxidizer is selected C powder, ferrosilicon powder, silicon calcium powder and aluminium powder, diffusion deoxidizer will add in batches, treat that slag bleaches, viscosity is suitable, after thermometric sampling, according to analytical results, liquid steel temperature is raised to >=adjust alloying constituent after 1620 ± 10 ℃, after alloying, again temperature is raised to 1590 ± 10 ℃, and get total analysis sample;
2.4) in refining later stage stove, to keep pressure-fired, continue to add diffusion deoxidizer, keep reducing atmosphere;
2.5) refining time is not less than 45 minutes, requires refining white slag hold-time >=20 minute after above-mentioned alloy compositions adds, and adds ferro-vanadium before tapping;
2.6) refining furnace tapping temperature: 1585 ± 10 ℃;
Step 3, pour into a mould
It is 1550 ± 10 ℃ that cast requires cryogenic fast injection, teeming temperature, and it is complete that foundry goods is pressed foundary methods drawing moulding simultaneously, by the cast of pouring technology temperature, obtains ZG25MnSY6 foundry goods after casting parts thermal insulation, shake out, finishing;
Step 4, ZG25MnSY6 foundry goods is carried out to modifier treatment.
3. preparation method according to claim 2, its feature is: in described step 4, modifier treatment technological process is: first, 350 ℃ ± 10 ℃ insulations 1 ± 0.1 hour, then heat-up rate is controlled at≤60 ℃/h, is warmed up to 650 ℃ ± 10 ℃ insulations 1 ± 0.1 hour; Again heat-up rate is controlled at≤70 ℃/h, is warmed up to 940 ℃ ± 10 ℃ insulations 1 ± 0.1 hour, during soaking time shorter, heat-up rate is very fast, while reaching 940 ℃ of processing requirements, foundry goods is pulled out to heat treatment furnace, puts into 20# machine oil pond cooling; After foundry goods is cooling, again heat-up rate is controlled at≤60 ℃/h, is warmed up to 350 ℃ ± 10 ℃ insulations 1 ± 0.1 hour; Heat-up rate is controlled at≤70 ℃/h again, is warmed up to 600 ℃ ± 10 ℃ insulations 3 ± 0.2 hours, air cooling is to room temperature.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104353776A (en) * | 2014-10-27 | 2015-02-18 | 大丰市洪联铸钢有限责任公司 | Rolling mill rack casting process |
| CN107058680A (en) * | 2017-03-29 | 2017-08-18 | 河钢股份有限公司承德分公司 | A kind of LF refining deoxidation slagging method for producing the low silicon cold-forging steel of middle carbon |
| CN107164605A (en) * | 2017-03-29 | 2017-09-15 | 河钢股份有限公司承德分公司 | A kind of LF refining method of deoxidation for producing low-carbon welding wire steel |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH1060579A (en) * | 1996-08-23 | 1998-03-03 | Nippon Steel Corp | Cold formed square steel tube minimal in difference of material in cold formed part and having high weldability, and its production |
| CN1706979A (en) * | 2004-06-07 | 2005-12-14 | 河南石油勘探局南阳石油机械厂 | Cast steel for bearing parts in mechanical lifting system and its making process |
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|---|---|---|---|---|
| CN104353776A (en) * | 2014-10-27 | 2015-02-18 | 大丰市洪联铸钢有限责任公司 | Rolling mill rack casting process |
| CN107058680A (en) * | 2017-03-29 | 2017-08-18 | 河钢股份有限公司承德分公司 | A kind of LF refining deoxidation slagging method for producing the low silicon cold-forging steel of middle carbon |
| CN107164605A (en) * | 2017-03-29 | 2017-09-15 | 河钢股份有限公司承德分公司 | A kind of LF refining method of deoxidation for producing low-carbon welding wire steel |
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