CN104532027B

CN104532027B - A kind of ultra supercritical coal-fired unit pipe alloy CN617 production technology

Info

Publication number: CN104532027B
Application number: CN201410742232.4A
Authority: CN
Inventors: 张鹏; 张玉春; 王志刚; 李爱民; 杨玉军; 杨晓利; 李宁; 田水仙; 王洋洋; 刘猛; 王树财; 王艾竹; 朱洪涛; 刘正东; 包汉生; 陈璐珂; 于杰; 闫森
Original assignee: FUSHUN SPECIAL STEEL SHARES Co Ltd
Current assignee: FUSHUN SPECIAL STEEL SHARES Co Ltd
Priority date: 2014-12-09
Filing date: 2014-12-09
Publication date: 2016-09-14
Anticipated expiration: 2034-12-09
Also published as: CN104532027A

Abstract

The open a kind of ultra supercritical coal-fired unit pipe alloy CN617 production technology of the present invention, it is therefore an objective to realize Industry trial-production, reach hot-working and use condition.For achieving the above object, vacuum induction furnace smelting is formulated techniques below scheme: technological process: dispensing → get the raw materials ready → evacuate → feed → divide to electricity → charging → fine melt → stirring → standing → furnishing → pour into a mould；Use unique alloy composition proportioning and add trace element；Reasonably technological parameter.The bright beneficial effect of we: 1. solve industrial technological design and i.e. select suitable smelting process, ensure that the good thermal processability of chemical composition and finished ingot, pipe alloy CN617 has good performance and purposes widely accordingly；CN617 alloy is the laboratory test stage the most before this, and without Industry trial-production, present small-scale industrialized producing technology is the most successfully manufactured experimently, and has possessed the ability of batch production.

Description

A kind of ultra supercritical coal-fired unit pipe alloy CN617 production technology

Technical field

The invention belongs to nickel-base high-temperature alloy material field, relate to a kind of ultra supercritical coal-fired unit pipe alloy CN617 production technology.

Background technology

At present, coal fired power generation is in China's main energy sources generated energy nearly 80%, it is necessary to capacity of installed generator structure progressively to New forms of energy and clean energy resource adjust.The power supplying efficiency of 700 DEG C of ultra-supercritical power generation technologies will improve to 50%, every kilowatt hour Coal consumption can reduce nearly 70 grams again, and CO2 emission reduces 14%, is the road for development of clean combustion of coal generation technology.2010, I State has set up 700 DEG C of ultra-supercritical power generation technology Innovation Alliances of country, starts " PCR700 " plan.700 DEG C super faces A lot of critical components of boundary's coal unit need to use nickel-base high-temperature alloy material, to this end, allied member's unit has carried out 700 DEG C of uses The development work of high-pressure boiler tube material, during early stage screening material, technical committee of alliance material group determines Material composition and performance is improved on the basis of 617 alloys that European Union is recommended.CN617 alloy development difficulty is industrial technique Design (selecting suitable smelting process), it is ensured that composition and the hot workability of finished ingot；Pertinent literature describes 617 alloys Composition range and performance parameter, wider range of parameter is general cannot be specific in actual production；External pertinent literature closes 617 The smelting process that gold proposes is a lot, smelts including vacuum induction, or vacuum induction is smelted and added electroslag remelting, no matter which kind of smelter Skill brings adverse influence all can to the hot-working of finished ingot owing to the proportioning of composition is improper and process parameters design is unreasonable.

Summary of the invention

The open a kind of ultra supercritical coal-fired unit pipe alloy CN617 production technology of the present invention, it is therefore an objective to by using The proportioning of vacuum induction smelting and reasonably composition and process parameters design, it is achieved Industry trial-production, reach hot-working and use condition.

Pipe alloy CN617 produces total technological process:

Raw material preparation → vacuum induction furnace smelting → chemical analysis → metal electrode strips off the skin tack → consumable electrode vacuum furnace weight Molten → chemical analysis → alloy pig strips off the skin → alloy pig diffusion annealing → surface inspection → payment.

For achieving the above object, vacuum induction furnace smelting is formulated techniques below scheme:

1. technological process: dispensing → get the raw materials ready → evacuate → feed → to electricity → charging → fine melt → stirring → standing → tune Composition → cast (see figure 1)；

Technique is reduced to following four steps (Fig. 2 includes that 2-4 walks):

(1) dispensing and getting the raw materials ready；

Evacuation, feed, give electricity, fine melt, above step is series-operation, for the process of material；

(3) process in refining period: stir, stand, furnishing divides；

(4) water injecting electrode.

2. concrete technology measure

1. alloy CN617 chemical composition should meet table 1 and specifies

Table 1 %

Alloy Ni-Cr19-Co12-Mo9 chemical composition should meet table 2 and specify；

Table 2 %

2. control requirement according to alloying component and calculate the various return steel required for smelting, the amount of alloy material.Select metal The materials such as nickel, metallic cobalt, crome metal, metal molybdenum, metallic aluminium, Titanium, graphite electrode, wherein metallic nickel and metallic cobalt will be in advance Dispose the thin film on surface；Return expects that melting in advance processes, and chemical composition is accurate, and the raw material entering stove keeps cleaning, without greasy dirt；

3. evacuation, it is ensured that vacuum≤10Pa；Charging by batches enters stove, expects to electrification after loading the first batch of material；

4. loading sequence according to returning material after first simple metal, and not add with electrode containing Nb metal and return material simultaneously Enter；

5. power system startup utilizes the induction coil of body of heater to heat, and makes raw material be heated and starts fusing；

6. stirring 10min～15min after fine melt, stand 12min～20min, thermometric, samples I analysis ingredient and gas contains Amount；Gas content should meet O :≤20 × 10^-6, N:(100-200) × 10^-6If beyond regulation, needing heating-up temperature to exist 1500 DEG C～1520 DEG C, carry out sensing stirring, stir 10min, static 5min, depending on the cycle need to be according to gas analysis result；

7. vacuum degree control in refining period is at 1Pa～5Pa, and no less than 90min, thermometric T2, adjusting component C, Mo, Cr, CO, adds AL, Ti, stirs 10min, stands；

8. argon filling 3000Pa: sampling II, inching composition C, AL, Ti, and add B, stir 10min, thermometric T3, take double Sample, temperature reaches 1460 DEG C～1490 DEG C and can tap；

9. cast: moderate temperature, adjusts crucible angle rotating electrode mould, makes depositing funnel relative with mould, controls cast Speed also ensures time of feeding.

The inventive point of the present invention and beneficial effect:

1. CN617 alloy smelting technology is only introduced without relevant documents and materials, the Inconel617 alloy abroad produced Smelting process: the smelting process introduced such as ASTM or SAE etc. is vacuum induction or vacuum induction adds electroslag, produces for comforting steel The smelting process of highly purified ultra supercritical blank tube material CN617 alloy is international pioneering, the chemistry one-tenth of particularly CN617 alloy Divide and there is originality, have the biggest in terms of the interpolation of chemical composition proportioning and trace element with external Inconel617 alloy Difference, CN617 alloy is that modified model has good performance and purposes widely accordingly；CN617 alloy is simply the most before this In the laboratory test stage, without Industry trial-production, present small-scale industrialized producing technology is the most successfully manufactured experimently, and has obtained batch The ability produced, lays a good foundation for thermal power station of China autonomy-oriented material.

Accompanying drawing explanation

Fig. 1 is CN617 alloy vacuum induction furnace smelting process chart；

Fig. 2 is CN617 alloy vacuum induction furnace smelting process sequence diagram.

Detailed description of the invention

Below in conjunction with accompanying drawing 2 and instantiation, the present invention is described in more detail.

The technological measure that embodiment 1, embodiment 2 and embodiment 3 perform jointly:

1. alloy CN617 chemical composition is allocated into and controls；

2. control requirement according to alloying component and calculate the various return steel required for smelting, the amount of alloy material.Select metal The materials such as nickel, metallic cobalt, crome metal, metal molybdenum, metallic aluminium, Titanium, graphite electrode, wherein metallic nickel and metallic cobalt will be in advance Dispose the thin film on surface；Return expects that melting in advance processes, and chemical composition is accurate, all enter stove raw material keep cleaning, nothing Greasy dirt；

6. stirring 10min～15min after fine melt, stand 12min～20min, thermometric, samples I analysis ingredient and gas contains Amount；

7. vacuum degree control in refining period is at 1Pa～5Pa, and no less than 90min；

8. argon filling 3000Pa: sampling II, inching composition；Temperature reaches 1460 DEG C～1490 DEG C and can tap；

Embodiment 1

Produce CN617 alloy, heat (batch) number: 13242200062, crucible capacity: 6 tons, ingot weight: 5448kg.

1. CN617 alloying component is allocated into by table 3 and controls,

Table 3 %

6. fine melt state thermometric guarantee temperature is at 1520 DEG C, oxygen content 12 × 10^-6Nitrogen content: 127 × 10^-6；

7. refining period, be adjusted according to the chemical composition of fine melt, make chemical composition close to desired value, such as table 4 below,

Table 4 %

8. adding Fe-B after filling Ar gas makes B element according to 0.0035% target control, the most entirely receives according to finished product result.Become Product chemical composition analysis result such as table 5,

Table 5 %

9. cast: temperature is at 1480 DEG C, and the duration of pouring is 8min.

Embodiment 2

Produce CN617B alloy, heat (batch) number: 14,240 170142, crucible capacity: 6 tons, ingot weight: 5448kg.

1. CN617 alloying component is allocated into by table 3 and controls；

3. evacuation, by rough vacuum to condition of high vacuum degree (10Pa to 2Pa), this process is due to raw material fusing venting side by side Gas, vacuum constantly fluctuates, and uses gas change in sample analysis gas monitor molten steel；

[4. loading sequence: Ni plate, metal Cr, Co plate, metal Mo etc.；

6. fine melt is through 7 hours fine melts, fine melt temperature 1510 DEG C；

8. tapping temperature 1490 DEG C is poured into a mould；

Each stage chemistry composition with receive situation is shown in Table 6,

Table 6 %

Finished product gas: H:1.3 × 10^-6, O:10 × 10^-6, N:20 × 10^-6。

Embodiment 3

Produce Ni-Cr19-Co12-Mo9 alloy forging material, heat (batch) number 12,242 210342, crucible capacity: 1 ton, ingot weight 976kg。

As it is shown in figure 1,

1. Ni-Cr19-Co12-Mo9 alloying component is allocated into by table 2 and controls；

3. evacuation vacuum reaches 8Pa and along with raw-material fusing is constantly exitted, deaerated to fine melt；

4. loading sequence: be followed successively by Ni plate, intermediate alloy, metal Cr, Mo, Co；

6. after fine melt, flavoring agent is simultaneously introduced Ta, stirs 20min, and fine melt gas obtains result O:7 × 10^-6, N:85 × 10^-6, Stirring degassing, gas result O:10 × 10 in refining process^-6, N:20 × 10^-6；Chemical composition analysis result such as table 7；

9. Pouring control poring rate, the duration of pouring 2min, pouring temperature, at 1480 DEG C, pours into a mould an electrode,

Table 7 %

C	Mn	Si	S	P	Cr	Mo	Co	Al	Ti	Fe
											0.07	0.01	0.05	0.001	0.001	19.24	9.51	11.51	1.25	1.40	0.54

Claims

1. a ultra supercritical coal-fired unit pipe alloy CN617 production technology, total technological process:

Raw material preparation → vacuum induction furnace smelting → chemical analysis → metal electrode strip off the skin tack → consumable electrode vacuum furnace remelting → Chemical analysis → alloy pig strips off the skin → alloy pig diffusion annealing → surface inspection → payment, it is characterised in that:

Described vacuum induction furnace smelting alloy CN617 chemical composition should meet table 1 and specify:

Table 1 %

The concrete technology flow process of described vacuum induction furnace smelting: dispensing → get the raw materials ready → evacuation → charging → give electricity → charging → complete Molten → stirring → standing → furnishing divides → pours into a mould；

The concrete technology flow process of above-mentioned vacuum induction furnace smelting is divided into following four steps:

(1) dispensing and getting the raw materials ready；

(3) process in refining period: stir, stand, furnishing divides；

(4) argon filling, cast;

Described dispensing is according to alloy composition and controls the various return steel required for requirement calculating is smelted, the amount of alloy material；

Described selection metallic nickel, metallic cobalt, crome metal, metal molybdenum, metallic aluminium, Titanium, the graphite electrode material of getting the raw materials ready, Qi Zhongjin Genus nickel and metallic cobalt to anticipate the thin film on surface；Return steel melting in advance to process, chemical composition is accurate, all enter stove Raw material keeps cleaning, without greasy dirt；

Described evacuation, it is ensured that vacuum≤10Pa；Charging by batches enters stove, expects to electrification, reload after loading the first batch of material；

Described loading sequence according to returning steel after first simple metal, and not to be simultaneously introduced with electrode containing Nb metal and return steel；

Described is i.e. that power system startup utilizes the induction coil of body of heater to heat to electricity, makes raw material be heated and starts fusing；

Stir 10min～15min after described fine melt, stand 12min～20min, sample I analysis ingredient and gas content；Gas Content analysis, it should meet O :≤20 × 10^-6, N:(100～200) × 10^-6；If beyond regulation, needing heating-up temperature to exist 1500 DEG C～1520 DEG C, carry out sensing stirring, stir 10min, static 5min, depending on the cycle need to be according to gas analysis result；

Described refining period, vacuum degree control was at 1Pa～5Pa, and no less than 90min, thermometric T2, adjusting component C, Mo, Cr, Co, Add Al, Ti, stir 10min, stand；

Described argon filling 3000Pa, sampling II, inching composition C, Al, Ti, and add B, stir 10min, thermometric T3, take double sample；

Described cast: temperature reaches 1460 DEG C～1490 DEG C and can tap, adjusts crucible angle rotating electrode mould, makes depositing funnel Relative with mould, control poring rate and ensure the time of feeding.

The most according to claim 1, a kind of ultra supercritical coal-fired unit pipe alloy CN617 production technology, its feature exists Allocate into by table 2 in: described vacuum induction furnace smelting CN617 alloying component and control；

Table 2 %

Described fine melt state thermometric ensure temperature at 1520 DEG C, oxygen content 12 × 10^-6, nitrogen content: 127 × 10^-6；

In described refining period, be adjusted according to the chemical composition of fine melt, make chemical composition close to desired value, such as table 3 below；

Table 3 %

Adding Fe-B after the described Ar of filling gas makes B element according to 0.0035% target control, the most entirely receives according to finished product result；Finished product Chemical composition analysis result such as table 4；

Table 4 %

Described pouring temperature is at 1480 DEG C, and the duration of pouring is 8min.