CN105779698A

CN105779698A - Smelting method of niobium-contained chrome nickel iron alloy

Info

Publication number: CN105779698A
Application number: CN201610151575.2A
Authority: CN
Inventors: 周海彬
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-03-17
Filing date: 2016-03-17
Publication date: 2016-07-20
Anticipated expiration: 2036-03-17
Also published as: WO2017157351A1; CN105779698B

Abstract

The invention relates to a smelting method of a chrome nickel iron alloy. High-carbon and high-silicon wastes are molten to form master batch molten steel; the master batch molten steel is poured in an AOD or GOR furnace to remove carbon, silicon, nitrogen and the like in the molten steel; meanwhile, a reducing agent is adopted to retain precious metal-niobium in the molten steel to reduce the later niobium feeding quantity; quantitative slag producing materials-high-activity lime are added; after carbon in the molten steel satisfies the process, alloy is replenished for secondary reduction; and finally, aluminum and titanium are replenished for tapping. The smelting method enables the chrome nickel iron alloy wastes on the market to be preferably used. The high-carbon and high-silicon raw materials with low cost can produce high-temperature corrosion resistant alloys with high additional value to achieve excellent social benefit.

Description

The smelting process of the inconel containing niobium

[technical field]

The method that the present invention relates to prepare alloy with melting, is specifically related to the smelting side of inconel containing niobium Method.

[background technology]

Inconel718 (GH4169) and Inconel625 (GH3625), Inconel725 (GH3725) mark Quasi-chemical composition is as follows:

Inconel718 (GH4169) and Inconel625 (GH3625), Inconel725 (GH3725) pass System technique uses the method for intermediate frequency and vacuum intermediate-frequency to smelt, and no matter which kind of method all cannot solve the carbon in raw material The problem high with silicone content；If using both technique to produce, it is necessary for allocating into when dispensing a high proportion of Simple metal material reduces carbon, silicone content, so that dispensing cost significantly rises.

Inconel718 (GH4169) and Inconel625 (GH3625), Inconel725 (GH3725) pass If the method that system technique uses intermediate frequency is smelted, owing to bringing substantial amounts of gas into, again when wood shavings return material fusing Owing to this technique cannot remove gas in molten steel, steel quality is made significantly to decline.

For above-mentioned reasons, substantial amounts of Inconel718 (GH4169) and Inconel625 (GH3625) on market, Inconel725 (GH3725) is completely used for smelting this steel grade, it has to sacrifice niobium expensive in raw material, will Niobium recycles other metallic element after burning, cause the waste of substantial amounts of social resources and cost increase.

[summary of the invention]

It is an object of the invention to solve prior art is removed carbon and high the asking of dispensing cost of silicon in raw material Topic.

Another object of the present invention is to solve to need sacrificial noble metal niobium when prior art is smelted, cause resource The problem of waste.

Another object of the present invention is to, make the high-carbon of low cost, high silicon raw material can produce the height of high added value Temperature corrosion resistant alloy, reaches good social benefit.

To achieve these goals, invent the smelting process of a kind of inconel containing niobium, including

I. use intermediate frequency furnace fusing to obtain molten steel containing niobium masterbatch, use intermediate frequency furnace or additive method to obtain without niobium mother liquor To molten steel,

Ii. in molten steel enters AOD or GOR stove, according to the content of silicon in molten steel, calculate and silicon is all aoxidized Required amount of oxygen, and blowing molten steel according to the amount surpassing 0～50%, adds corresponding amount needed for over-blowing amount of oxygen Reducing agent, carries out blowing reduction in 2～4 minutes, is drawn totally by slag after having blown；Silicon as original in fruit mother liquor contains Measure the highest, and the silicone content of product require the strictest, it is allowed to do not use this step,

Iii. continue to be blown into the mixed gas of oxygen, argon gas, make the carbon in oxygen and molten steel form carbon monoxide gas Body overflows, and by carbon monoxide and the spilling of inert gas, reduces carbon content in molten steel；And make in molten steel Nitrogen, hydrogen obtain part and remove,

Iv. adding the slag material of alkalescence, addition is the slag material that molten steel per ton adds 40～200 kilograms,

. sample analysis, if after carbon content reaches requirement, calculate reduction niobium required reduction dosage, and at this On the basis of add the strong reductant (such as aluminium or magnesium) of ton molten steel 2～20 kilograms, noble metal niobium is reduced, simultaneously In control molten steel, silicone content is in required scope,

. sample analysis molten steel composition, calculate except the conjunction of element needed for active element (such as aluminium, titanium) outer standard Gold additional amount, if alloy additional amount is big, the most first fills up required alloy, and enters after continuing to blow 1～4 minute again Row draws slag, if alloy additional amount is little, draws slag whole the most immediately,

. except filling into ton steel 5～30 kilograms of alkaline slag charges and slag charge quality while active element needed for supplying 20～the fluorite of 80%；

. continue sampling, calculate and fill into the alloy of all required elements according to result.

The method also includes following optimization technique:

The described inconel containing niobium is Inconel718/GH4169, Inconel625/GH3625, Inconel725/GH3725。

Described masterbatch includes: uses the waste material of this steel grade or uses other waste materials proportioning in proportion containing niobium.

Described masterbatch includes: a. high carbon ferro-chrome or crome metal or chromic carbide iron, and b. pure nickel plate or useless nickel, Molybdenum pure with c. or molybdenum-iron or useless molybdenum, and d. pure iron, carry out proportioning in required ratio.

In step ii., according to the content of silicon in molten steel, calculate and silicon is all aoxidized required amount of oxygen, and press Blow molten steel according to the amount surpassing 0～50%, add the reducing agent of corresponding amount needed for over-blowing amount of oxygen, carry out 2～4 points Clock blowing reduction, draws slag totally after having blown.

The described lime that alkaline slag material is high activity degree.

Described reducing agent is the strong reductants such as aluminium, magnesium, and the addition of aluminium or magnesium etc. is converted by the following method Obtaining: in step ii, after the carbon content in molten steel is less than less than 0.03%, sample analysis, according to always using oxygen When tolerance deduction early stage draws slag with amount of oxygen and deduct carbon in molten steel, silicon aoxidizes required amount of oxygen, then Convert the aluminium of using needed for reducing, and allocate ton steel 5～20 kilogram aluminium according to content of niobium in female molten steel is more；Blowing 4～8 minutes.

In step iii, carbon needs preferably to blow to less than less than 0.03%.It is suitable for general purpose product, low In less than 0.005%.It is suitable for purposes high request product.

In step. in, in addition to need to adding the required reducing agent of reduction, 5～30 kilograms of fine aluminiums added again by ton molten steel.

In step. in, the alloy total amount added needed for calculating exceedes the 3～10% of total molten steel amount (by steel in stove Water tonnage 5～100 tons), continue blowing 2～10 minutes after first filling into alloy, then draw slag whole.

In step. in, the 3～10% of the total not molten steel amount of the alloy total amount added needed for calculating are (by steel in stove Water tonnage 5～100 tons), draw slag whole, then fill into alloy.

In step. in, fill into and while alloy, continue to fill into ton molten steel 5～30 kilograms of slag making in addition to aluminium, titanium Material and corresponding mass 20～the fluorite of 80%.

In step. in, to the general product required, it is not necessary to all draw slag, retain 10～40% quantity of slag, then In step. in, it is not necessary to add ton molten steel 5～30 kilograms of slag materials and corresponding mass 20～the fluorite of 80%.

The present invention passes through AOD (GOR) smelting process, makes the inconel on market, such as Inconel718 (GH4169) obtain well with Inconel625 (GH3625), Inconel725 (GH3725) waste material Utilize.And make the high-carbon of low cost, high silicon raw material can produce the high-temperature corrosion-resistant alloy of high added value, reach Well social benefit.

[detailed description of the invention]

Hereinafter, in conjunction with the embodiments, the present invention is described further, it will be appreciated that embodiment is only used for Illustrate rather than limit protection scope of the present invention.

Charger sheet

Above-described embodiment 1 and embodiment 3 are required to use intermediate frequency furnace mode to be fused into temperature and reach 1500～1700 DEG C Molten steel；Embodiment 2 can be selected and carry out being fused into temperature in other ways and reach 1500～1700 DEG C of molten steel；Sampling Analyze after ladle chemistry and pour in AOD furnace；

It is 718 smelting example in embodiment 2 below

Intermediate frequency furnace

After 10470 kilograms of pure 718 waste materials are added intermediate frequency furnace, sample analysis result is as follows:

Element	Woollen weight	Molten steel weight	Cold burden weight	C	Si	Mn	P	S
										10470	10400	0	0.538	0.337	0.179	0.003	0.000
Element	Cr	Mo	Fe	Al	Nb	Co	Ti	Ni
									1#	17.758	2.954	19.914	0.073	5.297	0.122	0.645	51.989

Above-mentioned molten steel is poured in AOD (GOR) stove

The mixed gas of certain pressure oxygen and inert gas uninterruptedly it is blown in AOD (GOR) stove, with Time calculate all oxidation requisite oxygen tolerance according to silicone content in molten steel, and be blown into oxygen 90 by the amount surpassing 10～50% Cube, use straight argon air-blowing 3 minutes after adding fine aluminium 20 kilograms again；Then slag clean sample analysis chemistry is drawn to become Point；

Element	Blowing oxygen quantity	Al silk	Slag treatment	C	Si	Mn	P	S
									1#	90	20	Skim	0.447	0.090	0.212	0.005	0.000
Element	Cr	Mo	Fe	Al	Nb	Co	Ti	Ni
									1#	18.223	3.00	20.361	0.025	5.001	0.126	0.092	52.239

Continue to be blown into the mixed gas of oxygen and inert gas, and constantly adjust according to liquid steel temperature and carbon content Oxygen, the ratio of inert gas, add 800 kilograms of high activity degree lime, make liquid steel temperature reach 1650～1800 DEG C, simultaneously according to product gas content required difference carbon is blown to respectively≤ 0.005～0.03%；

After flow of oxygen reaches 248 cubes, sample analysis result is as follows:

Element	Blowing oxygen quantity	Temperature	Good lime	C	Si	Mn	P	S
									1#	248	1762	800	0.004	0.040	0.241	0.004	0.000
Element	Cr	Mo	Fe	Al	Nb	Co	Ti	Ni
									1#	20.520	3.433	20.586	0.025	0.000	0.091	0.096	54.768
Nickel plate	500	Pure molybdenum	40	Crome metal	300

By always estimating that 300 cubic inches add reducing material with amount of oxygen, deduct 90 cubes of oxygen of early stage, then detain De-carbon, silicon amount of oxygen 50 cubes, the required aluminium consumption of reduction is at 110 kilograms, it is considered to excess needed for reduction niobium Aluminium consumption, then add 180 kilograms of aluminium, after reducing 6 minutes, sample analysis result is as follows:

Element	Blowing oxygen quantity	Cold burden	Al silk	C	Si	Mn	P	S
									300	0	280	0.006	0.054	0.246	0.009	0.000
Element	Cr	Mo	Fe	Al	Nb	Ni	Molten steel weight	Actual weight
									19.355	3.182	19.61	0.045	4.000	53.117

According to above-mentioned analysis result, needing to add 220 kilogram of 65% ferronickel, carburetting is with 30 kilograms of high carbon ferro-chromes； Continuing blowing 4 minutes, sampling result is as follows:

Element	65%NbFe	High carbon ferro-chrome		C	Si	Mn	P
								220	30		0.015	0.061	0.259	0.009
Element	S	Cr	Mo	Fe	Al	Nb	Ni
								0.000	19.37	3.067	19.614	0.021	4.983	52.217

Draw slag whole, calculate add high carbon ferro-chrome 10 kilograms, pure useless molybdenum 10 kilograms, pure niobium 50 kilograms, 60 Kilogram fine aluminium, is simultaneously introduced 100 kilograms of lime, 70 kilograms of fluorites, blows 4 minutes, then sample analysis Result is as follows:

Element	Good lime	Fluorite	Slag condition	High carbon chromium	Pure molybdenum	Al silk	Pure niobium	C	Si
										100	70	Good	10	10	60	25	0.025	0.098
Element	Mn	P	S	Cr	Mo	Fe	Al	Nb	Ni
										0.244	0.004	0.000	19.562	3.079	19.934	0.431	4.952	51.32

According to the above results, find that nickel is on the low side, calculate fill into 200 nickel plate, 20 kilograms of pure molybdenums, 25 kilograms pure Niobium, 115 kilograms of pure titaniums, 30 kilograms of aluminium, use argon gas to tap, under check analysis result after blowing 3 minutes:

Element	Nickel plate	Pure molybdenum	Pure niobium	Ti	Al	C	Si	Mn	P	S
											Finished product	200	20	25	115	30	0.026	0.120	0.253	0.010	0.001
Element	Cr	Mo	Fe	Al	Nb	Ti	Ni
											Finished product	18.751	3.163	18.987	0.442	5.158	0.87	51.995

Claims

1. a smelting process for the inconel containing niobium, including

Characterized by further comprising:

Ii. in molten steel enters AOD or GOR stove, according to the content of silicon in molten steel, calculate needed for silicon is all aoxidized Amount of oxygen, and blow molten steel according to the amount surpassing 0～50%, add corresponding amount needed for over-blowing amount of oxygen also Former dose, carry out blowing reduction in 2～4 minutes,

Iii. continue to be blown into the mixed gas of oxygen, argon gas, make the carbon in oxygen and molten steel form carbon monoxide gas Body overflows, and by carbon monoxide and the spilling of inert gas, reduces carbon content in molten steel, and makes in molten steel Nitrogen, hydrogen obtain part remove,

. sample analysis, if after carbon content reaches requirement, calculate reduction niobium required reduction dosage, and at this base Add ton molten steel 2～the strong reductant of 20 kilograms on plinth, noble metal niobium is reduced, control silicon in molten steel simultaneously Content in required scope,

. sample analysis molten steel composition, calculate the alloy additional amount of element needed for standard except active element in addition to, if conjunction Gold additional amount is big, the most first fills up required alloy, and carries out drawing slag, if closing after continuing to blow 1～10 minute again Gold additional amount is little, draws slag whole the most immediately,

2. the smelting process of inconel as claimed in claim 1, it is characterised in that the described chromium ferronickel containing niobium Alloy is Inconel718/GH4169, Inconel625/GH3625, Inconel725/GH3725.

3. the smelting process of inconel as claimed in claim 1, it is characterised in that described masterbatch includes: Use the waste material of this steel grade or use other waste materials proportioning in proportion containing niobium.

4. the smelting process of inconel as claimed in claim 1, it is characterised in that described masterbatch includes: a. High carbon ferro-chrome or crome metal or chromic carbide iron, and b. pure nickel plate or useless nickel, and the pure molybdenum of c. or molybdenum-iron or Useless molybdenum, and d. pure iron, carry out proportioning in required ratio.

5. the smelting process of inconel as claimed in claim 1, it is characterised in that in step ii., be additionally added The strong reductant of corresponding amount needed for oxygen blast tolerance, carries out blowing reduction in 2～4 minutes, by slag after having blown Draw clean.

6. the smelting process of inconel as claimed in claim 1, it is characterised in that described strong reductant is Aluminium, magnesium strong reductant, the addition of aluminium or magnesium converts by the following method and obtains: in step ii, steel After carbon content in water is less than less than 0.03%, sample analysis, according to always drawing slag by amount of oxygen deduction early stage Time with amount of oxygen and deduct carbon in molten steel, silicon aoxidize required amount of oxygen, then convert reduce needed for With aluminium, and allocate molten steel 5 per ton～20 kilograms of aluminium into according to content of niobium in female molten steel more；Blow 4～8 minutes.

7. the smelting process of inconel as claimed in claim 1, it is characterised in that in step iii, carbon needs Blow to less than less than 0.03%.

8. the smelting process of inconel as claimed in claim 1, it is characterised in that in step, calculate Needed for the alloy total amount added exceed the 3～10% of total molten steel amount, first fill into alloy, continue blowing 2～10 afterwards Minute, then draw slag whole；The 3～10% of the total not molten steel amount of the alloy total amount added, first draw slag whole, Then alloy is filled into.

9. the smelting process of inconel as claimed in claim 1, it is characterised in that: In step. in, fill into and while alloy, continue to fill into ton molten steel 5～30 kilograms of slag materials in addition to aluminium, titanium With corresponding mass 20～the fluorite of 80%.

10. the smelting process of inconel as claimed in claim 1, it is characterised in that in step. in, to one As the product that requires, it is not necessary to all draw slag, retain 10～40% quantity of slag, then in step. in, nothing Ton molten steel 5～30 kilograms of slag materials and corresponding mass 20～the fluorite of 80% need to be added.