CN100496809C - Dual phase nitrogen-containing stainless steel casting method without burning and without oxidation - Google Patents
Dual phase nitrogen-containing stainless steel casting method without burning and without oxidation Download PDFInfo
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- CN100496809C CN100496809C CNB2007101443897A CN200710144389A CN100496809C CN 100496809 C CN100496809 C CN 100496809C CN B2007101443897 A CNB2007101443897 A CN B2007101443897A CN 200710144389 A CN200710144389 A CN 200710144389A CN 100496809 C CN100496809 C CN 100496809C
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Abstract
The present invention provides a burn spoilage free and oxidation free method for casting biphase stainless steel. The method includes control on chemical components of material and preparation of charaging material, control on operational procedures and vacuum in stove, vacuum break and subsequent process after the vacuum break and so on. The present invention enables casting two or more casts or steel ingots with single large ladle under vacuum. After casting, the burn spoilage rates about chemical elements of all casts or steel ingots are nearly zero; thereby the present invention achieves casting multiple casts or steel ingots under conditions of single chamber, single ladle and vacuum. The present invention solves the problems about burn spoilage and oxidation of chemical elements in process of casting multiple casts or stell ingots with single ladle of stell liquid under vacuum, so the burn spoilgage and oxidation rate of chemical elements can be as low as possible in productd casts, and serial problems in using deoxidizer after vacuum break can be overcomed at the same time.
Description
(1) technical field
What the present invention relates to is a kind of casting method, specifically the casting technology of a kind of casting technology of two phase stainless steel, particularly nitrogen bearing duplex stainless steel.
(2) background technology
Two phase stainless steel has the advantage of ferritic stainless steel and austenitic stainless steel concurrently, all have good index and characteristics at aspects such as the anti-pitting of the low stress burn into of anti-chloride stress cracking the, resistance to corrosion fatigue, wear-resistant burn into comprehensive mechanical property, weldability, processability, physical properties, thereby obtain people's attention, and be applied to fields such as oil, chemical industry, ocean development.Melting is a necessary process links of making two-phase stainless steel casting or steel ingot, at present, the melting of two phase stainless steel mainly is to adopt vacuum melting and two kinds of methods of atmosphere melting, and the atmosphere melting is easy to generate phenomenons such as oxidation, and makes part melting loss of elements in the chemical composition of foundry goods.The use of deoxidier causes easily that the part element exceeds standard in the foundry goods chemical composition, produces spot segregation, and the performance of material is affected.Decay resistance, high-temperature behavior and fatigue behaviour in order to improve material obtain high-quality foundry goods or steel ingot, avoid air-breathing and generation pore and fragility, must adopt vacuum melting.Common vacuum melting at present only is suitable for the melting and the cast of single stove single chamber single-piece.And in the actual production, often need one heat steel water to pour into a mould two or more foundry goods or steel ingot, melting and cast for many in this single stove, often adopt the vacuum breaker method to carry out, phenomenons such as the scaling loss of meeting generation oxidation, slag inclusion, alloying element and the segregation of chemical composition and fluctuation, for fear of this phenomenon, can also adopt two Room or three Room vacuum drying ovens to carry out melting.And the price of this equipment is high, has restricted the application of this equipment.Thereby get back to the single chamber smelting furnace again and carry out melting and cast, must relate to a series of problems that produced behind the vacuum breaker of vacuum melting and the vacuum breaker.
(3) summary of the invention
The object of the present invention is to provide a kind of larger capacity list Baogang water of can realizing to pour into a mould two or more foundry goods or steel ingot, the burn out rate of the chemical element of institute's pouring cast part or steel ingot is little, can exempt the no scaling loss oxidation casting method of the nitrogen bearing duplex stainless steel of a series of problems that deoxidier produced of use simultaneously.
The object of the present invention is achieved like this:
1, the preparation of the control of material chemical composition and furnace charge:
According to the trade mark, technical specification and the control criterion of selected materials, determine the component content of alloying element, carry out the preparation of furnace charge on this basis;
2, the control of vacuum in operation sequence and the stove:
Furnace charge is put according to following rules in the interior crucible of stove: pure iron material furnace charge is placed on bottom, skin and top, and the alloying element furnace charge is placed in the furnace charge middle part; The nitrided ferro-chromium furnace charge is placed in the loading hopper, after each furnace charge is put and finished, mold or ingot mould is put into to pouring position, begins to vacuumize, and to 1～2Pa, closes vavuum pump; Charge into protective gas then; Inflation back furnace pressure controls to 7 * 10
4Pa closes charge valve then, begins to send electricity to load, and after furnace charge melts in the crucible, adds nitrided ferro-chromium from loading hopper, continues to be heated to the cast that pouring temperature is carried out first foundry goods or steel ingot then; Cast back foundry goods or steel ingot solidify in stove and be cooled to when the surface is kermesinus observes crucible, and the molten steel in crucible also solidifies, and surface blow-on vacuum breaker when being kermesinus, otherwise continues cooling;
3, the processing method of other subsequent processes behind vacuum breaker and the vacuum breaker:
Take out first foundry goods or steel ingot behind the vacuum breaker in stove, place second mold or ingot mould then, banking vacuumizes; Be evacuated to when vacuum is 1～2Pa and close vavuum pump, charge into protective gas; Being inflated to furnace pressure is 7 * 10
4Close charge valve during Pa, begin to send electricity to load, be heated to the cast that pouring temperature is carried out second foundry goods or steel ingot after the thawing; Cast back foundry goods or steel ingot solidify in stove and be cooled to when the surface is kermesinus observes crucible, and the molten steel in crucible also solidifies, and surface blow-on vacuum breaker when being kermesinus, otherwise continues cooling; The casting method of the 3rd foundry goods or steel ingot is identical with second, and the rest may be inferred finishes until cast.
The present invention can also comprise:
1, the described vacuum that is evacuated to is that the vacuum of 1～2Pa replaces with and is controlled in 0.5～1Pa scope.This vacuum ranges is suitable for the endurance corrosion with steel or for the relatively stricter steel of oxide inclusion requirement.
2, described protective gas is an argon gas, for nitrogen bearing duplex stainless steel, when used vacuum drying oven does not have feeding device, can adopt nitrogen to make protection gas, and other operational procedures are identical with the argon shield program.
The present invention has realized that larger capacity list Baogang water pours into a mould two or more foundry goods or steel ingot, and after the casting, the burn out rate of the chemical element of institute's foundry goods or steel ingot is all almost nil, and realization single chamber list bag is poured into a mould many pieces foundry goods or steel ingot.The invention solves in the vacuum casting process single Baogang water and pour into a mould many pieces foundry goods or steel ingot burning problems, make that the burn out rate of chemical element of institute's pouring cast part is as far as possible little, simultaneously, exempt a series of problems that deoxidier produced of using.
(4) specific embodiment
For example the present invention is done in more detail below and describes:
Adopt the inventive method to use one heat steel water with three clover leaf coupons of vacuum induction method founding, material therefor is A890/A890M-99---the 3A among the ASTM, its chemical composition sees Table 1.
Table 1 two phase stainless steel 3A chemical composition scope (%)
| C | Si | Mn | P | S | Cr | Ni | Mo | N |
| ≤ 0.06 | ≤ 1.00 | ≤ 1.00 | ≤ 0.040 | ≤ 0.040 | 24.0-27.0 | 4.0-6.0 | 1.75-2.5 | 0.15-0.25 |
The clover leaf coupon shell adopts lost-wax process to make, and applies to be incubated after roasting technique is handled, and is stand-by.The chemical composition of furnace charge sees Table 2.According to the technical specification of 3A two phase stainless steel, determine the chemical composition of coupon, its control criterion sees Table 3.
Table 2 furnace charge chemical composition (%)
| Furnace charge | C | Si | P | S | Cr | Mo | Ni | N |
| Nitrided ferro-chromium | 0.352 | 0.32 | 60.64 | 6.14 | ||||
| Molybdenum-iron | 0.029 | 0.10 | 0.035 | 0.070 | 57.49 | |||
| Chromic carbide iron | 0.062 | 1.98 | 61.61 | |||||
| The nickel plate | 99.98 | |||||||
| Pure iron | 0.0079 | 0.0035 | 0.016 | 0.005 |
Table 3 coupon chemical Composition Control table
| Alloying element | C | Cr | Ni | Mo | N |
| Content (%) | Determine by calculated value | 25.5 | 5.0 | 2.125 | 0.2 |
Calculate by the insurance method, the weight of each coupon is 10kg, and so required molten steel total amount is 30kg, and then required furnace charge total amount also is 30kg, calculates the consumption of determining various furnace charges by table 2 and table 3 process, sees table 4 for details.
Table 4 furnace charge consumption inventory
| The furnace charge title | Nitrided ferro-chromium | Molybdenum-iron | Chromic carbide iron | The nickel plate | Pure iron | Total amount |
| Consumption (kg) | 0.978 | 1.1089 | 11.455 | 1.5 | 14.9581 | 30 |
Through calculating, final total carbon content is 0.0004%, meets 3A standard among A890/A890M-99-ASTM, can carry out next process.Furnace charge is put in the following manner in the stove: the pure iron material is placed on bottom, and the top all around; the inner alloy furnace charge of placing; because this loading hopper of testing used induction furnace breaks down and can't use,, and adopt nitrogen protection so nitrided ferro-chromium is positioned over inside with other alloy furnace charges.The coupon formwork that is in keeping warm mode that will take out in the roaster is put into the stove pouring position, closes bell then, begins to vacuumize, and to 1.5Pa, closes vavuum pump.Charge into nitrogen to 7 * 10 in the stove
4Pa closes charge valve then, begins to send electricity to load.Be heated to pouring temperature after the fusing, stop to load and pour into a mould, after cast finished, the coupon foundry goods solidified in stove, and was cooled to the surface and is kermesinus at once, treat that molten steel in the crucible also is kermesinus after, can blow-on, vacuum breaker.Take out behind the foundry goods at once the coupon formwork that is in keeping warm mode that will take out in the roaster and put into the stove pouring position, begin to vacuumize after closing bell, carry out the cast of second coupon, method is identical with first coupon, the rest may be inferred, carries out the cast of the 3rd coupon.
Chemical composition analysis has been carried out to three coupons in cast back, sees table 5 for details, and coupon numbering and experimental sequence are number corresponding.
Table 5 three coupon chemical composition analysis results (%)
| The coupon numbering | C | Si | Mn | P | S | Cr | Ni | Mo | N |
| 1 | 0.028 | 0.45 | 0.36 | 0.027 | 0.007 | 25.6 | 5.37 | 2.40 | 0.23 |
| 2 | 0.027 | 0.40 | 0.34 | 0.026 | 0.007 | 25.39 | 5.39 | 2.35 | 0.25 |
| 3 | 0.026 | 0.41 | 0.33 | 0.026 | 0.006 | 25.37 | 5.40 | 2.34 | 0.25 |
By table 5 as seen, the requirement of the chemical composition of institute's founding foundry goods---A890/A890M-99---ASTM that meets 3A.Contrast table 5 and table 3; the chemical composition with the expection preparation is close basically for the chemical composition of institute's casting coupon as can be seen; there is fluctuation by a small margin; this is relevant with raw-material primitive component analytical error; nitrogen element content slightly rises; relevant with nitrogen protection, because the dividing potential drop of nitrogen is bigger in the furnace gas, cause the content of nitrogen in institute's casting coupon slightly to rise.Contrast No. 1 coupon to 3 coupon, can find, from No. 1 coupon to 3 coupon, total trend is that constituent content reduces slightly, if this minimizing is regarded as scaling loss, this scaling loss can be approximated to be zero fully so, ignore, the present invention can regard the melting of alloy-free melting loss of elements as.Phenomenons such as the segregation of non-oxidation, slag inclusion, chemical composition and fluctuation take place simultaneously.
Claims (3)
1, a kind of no scaling loss oxidation casting method of nitrogen bearing duplex stainless steel is characterized in that:
(1) preparation of the control of material chemical composition and furnace charge:
According to the trade mark, technical specification and the control criterion of selected materials, determine the component content of alloying element, carry out the preparation of furnace charge on this basis;
(2) control of vacuum in operation sequence and the stove:
Furnace charge is put according to following rules in the interior crucible of stove: pure iron material furnace charge is placed on bottom, skin and top, and the alloying element furnace charge is placed in the furnace charge middle part; The nitrided ferro-chromium furnace charge is placed in the loading hopper, after each furnace charge is put and finished, mold or ingot mould is put into to pouring position, begins to vacuumize, and to 1～2Pa, closes vavuum pump; Charge into protective gas then; Inflation back furnace pressure controls to 7 * 10
4Pa closes charge valve then, begins to send electricity to load, and after furnace charge melts in the crucible, adds nitrided ferro-chromium from loading hopper, continues to be heated to the cast that pouring temperature is carried out first foundry goods or steel ingot then; Cast back foundry goods or steel ingot solidify in stove and be cooled to when the surface is kermesinus observes crucible, and the molten steel in crucible also solidifies, and surface blow-on vacuum breaker when being kermesinus, otherwise continues cooling;
(3) processing method of other subsequent processes behind vacuum breaker and the vacuum breaker:
Take out first foundry goods or steel ingot behind the vacuum breaker in stove, place second mold or ingot mould then, banking vacuumizes; Be evacuated to when vacuum is 1～2Pa and close vavuum pump, charge into protective gas; Being inflated to furnace pressure is 7 * 10
4Close charge valve during Pa, begin to send electricity to load, be heated to the cast that pouring temperature is carried out second foundry goods or steel ingot after the thawing; Cast back foundry goods or steel ingot solidify in stove and be cooled to when the surface is kermesinus observes crucible, and the molten steel in crucible also solidifies, and surface blow-on vacuum breaker when being kermesinus, otherwise continues cooling; The casting method of the 3rd foundry goods or steel ingot is identical with second, and the rest may be inferred finishes until cast.
2, the no scaling loss oxidation casting method of nitrogen bearing duplex stainless steel according to claim 1 is characterized in that: the described vacuum that is evacuated to is that the vacuum of 1～2Pa replaces with and is controlled in 0.5～1Pa scope.
3, the no scaling loss oxidation casting method of nitrogen bearing duplex stainless steel according to claim 1 and 2, it is characterized in that: described protective gas is argon gas or nitrogen.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007101443897A CN100496809C (en) | 2007-09-29 | 2007-09-29 | Dual phase nitrogen-containing stainless steel casting method without burning and without oxidation |
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| CNB2007101443897A CN100496809C (en) | 2007-09-29 | 2007-09-29 | Dual phase nitrogen-containing stainless steel casting method without burning and without oxidation |
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| CN100496809C true CN100496809C (en) | 2009-06-10 |
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| CN102626769B (en) * | 2012-04-10 | 2013-09-04 | 遵义拓特铸锻有限公司 | Manufacturing process of pump body casting of super duplex stainless steel centrifugal pump |
| CN104028707B (en) * | 2014-05-19 | 2016-03-16 | 安徽金大仪器有限公司 | A kind of preparation method of metal valve |
| CN107309405B (en) * | 2017-06-06 | 2018-12-21 | 洛阳双瑞特种装备有限公司 | A kind of casting method of super-duplex stainless steel 5A material impeller |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4253645A (en) * | 1978-02-07 | 1981-03-03 | The Japan Steel Works, Ltd. | Molten steel droplet scatter regulation cylinder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4253645A (en) * | 1978-02-07 | 1981-03-03 | The Japan Steel Works, Ltd. | Molten steel droplet scatter regulation cylinder |
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