CN105132722A - Silicon-nitrogen aluminium alloy additive and preparation method thereof - Google Patents
Silicon-nitrogen aluminium alloy additive and preparation method thereof Download PDFInfo
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- CN105132722A CN105132722A CN201510550889.5A CN201510550889A CN105132722A CN 105132722 A CN105132722 A CN 105132722A CN 201510550889 A CN201510550889 A CN 201510550889A CN 105132722 A CN105132722 A CN 105132722A
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Abstract
The invention relates to a silicon-nitrogen aluminium alloy additive and a preparation method thereof. The silicon-nitrogen aluminium alloy additive is composed of ferro-silicon nitride and aluminium particles, wherein the mass ratio of the ferro-silicon nitride to the aluminium particles is 87: (13 to 90): 10. The preparation method comprises the following steps: preparing the ferro-silicon nitride and the aluminium particles into particles with particle sizes of 3-5mm respectively, mixing the particles in a mass ratio of 87: (13 to 90): 10, and filling fireproof and dampproof packaging bags with the particles and sealing to obtain the finished product. The silicon-nitrogen aluminium alloy additive is especially suitable for deformed steel generated by a TMCP (controlled rolling and controlled cooling) process, and capable of controlling a nitrogen content in steel to be 95-110PPm on the premise of no addition of a vanadium-nitrogen alloy, reducing consumption of silico-manganese and ferro-silicon, and reducing the cost of per ton of steel by 15-17 yuan/ton; and the obtained steel is finer in grains, and achieves more than 8.5 levels.
Description
Technical field
The present invention relates to a kind of metallurgical addition agent, particularly a kind of silicon nitrogen aluminium alloy additive and preparation method thereof.
Background technology
The micro alloying element producing HRB400 conventional comprises vanadium, niobium, titanium etc.When using vanadium micro-alloying, adopt pair rolling technique just can obtain the qualified stable HRB400 Twisted Steel of performance.Vanadium is easier to be solidly soluted in steel, is easier to again separate out micro alloying element from steel.Time in steel containing more N, V is melted in after in steel, and the avidity due to V and N is greater than the avidity of V and C, and the N therefore more easily in steel is combined and forms VN, namely first generates VN, then generates VC.And the concentration of N in steel is higher, the V (C, N) separated out during rolling is more.
Do not add in the low nitrogen vanadium steel of nitride or addition deficiency, the vanadium of 56% is solid-solution in ferrite matrix, only has the vanadium of 35.5% to form V (C, N), micro alloying elements a large amount of in steel does not play the effect of precipitation strength and inhibiting grain growth, and in steel, the waste of V is larger.The high nitrogen vanadium steel adding the compounds such as ferro-silicon nitride is then contrary, and the vanadium of more than 70% is separated out and formed V (C, N), only has the vanadium of 20% to be admittedly fused in matrix.Thus enhance the precipitation strength of vanadium and the effect of crystal grain thinning.In steel, nitrogen pick-up also reduces V (C, N) particle size, adds the quantity of V (C, N) precipitated phase, thus the intensity containing V reinforcing bar is obviously raised.
Vanadium additive is in the market based on VN alloy, and in existing process for making, the add-on of VN alloy is about 0.32kg/t, amounts to ton steel cost 36.16 yuan.When current steel production industry profit is more and more lower, the approach reduced costs all is being found by each producer, and how to reduce production cost further in the situation meeting steel strength requirement is each steel production enterprise problem demanding prompt solution.
Summary of the invention
The object of this invention is to provide a kind of silicon nitrogen aluminium alloy additive and preparation method thereof, under the prerequisite of not adding VN alloy, guarantee that the quality of Deformed Steel Bars is gone forward side by side a step-down lower production cost.
In order to achieve the above object, the present invention has following technical scheme:
A kind of silicon nitrogen aluminium alloy additive of the present invention, described silicon nitrogen aluminium alloy additive is made up of ferro-silicon nitride and aluminum shot, and the mass ratio of ferro-silicon nitride and aluminum shot is 87:13-90:10.
In described silicon nitrogen aluminium alloy additive, silicone content is 40.9-45.9wt%, and nitrogen content is 26.1-28.8wt%, and aluminium content is 9.7-12.9wt%, and iron level is 11.3-13.5wt%, and surplus is inevitable impurity.
The preparation method of a kind of silicon nitrogen aluminium alloy additive of the present invention, concrete steps are as follows:
(1) ferro-silicon nitride, aluminum shot are carried out fragmentation, screening respectively, obtain the particle of 3 ~ 5mm granularity, and carry out the process of rolling ball making process to screen underflow, the particle making 3 ~ 5mm granularity reclaims;
(2) the ferro-silicon nitride particle obtained in step (1) and aluminum shot are mixed by the mass ratio of 87:13-90:10;
(3) product that step (2) obtains is loaded sealing in fire-resistant moisture-proof packing bag to get product.
In described ferro-silicon nitride, silicone content is 47-51wt%, and nitrogen content is 30-32wt%, and iron level is 13-15wt%.
In described aluminum shot, aluminium content is 98-99wt%.
Owing to taking above technical scheme, the invention has the advantages that:
(1), during steel-making, silicon nitrogen aluminium alloy additive finished product of the present invention is dropped into ladle, because granularity of the present invention is 3-5 millimeter, namely melt rapidly once contact molten steel and absorbed, avoiding being exposed in air oxidized, simple to operate, low cost of manufacture, and do not need specific installation;
(2) silicon nitrogen aluminium alloy additive of the present invention is specially adapted to the Deformed Steel Bars adopting TMCP (controlled rolling and cooling) explained hereafter, can under the prerequisite of not adding VN alloy, by the Control of Nitrogen Content in steel at 95 ~ 110PPm, and reduce the consumption of silicomanganese and ferrosilicon, ton steel cost can decline 15 ~ 17 yuan/ton (in Nanjing Steel stock Co., Ltd successful Application, silicomanganese 1.2kg/t can be saved compared with traditional technology, save ferrosilicon 4.0kg/t);
(3) terminal tapping temperature reduces with the minimizing of alloy addition, and use silicon nitrogen aluminium alloy additive of the present invention can reduce terminal tapping temperature about 10 DEG C, terminal tapping temperature often declines 1 DEG C, every ton steel cost decline 0.8-1 yuan/ton;
(4) strengthening mechanism of silicon nitrogen aluminium alloy is that the dispersoid particle of separating out nitride in steel hot rolling process is to the pinning effect grain refining intensificatiom of austenite crystal, and the dispersoid particle strengthening of second-phase, be the solution strengthening of the elements such as a kind of alternative traditional silicon, manganese.Therefore use the Deformed Steel Bars that silicon nitrogen aluminium alloy additive of the present invention is produced, compared with employing traditional technology, steel crystal grain is thinner, reaches more than 8.5 grades, is more conducive to the welding property improving steel.
Embodiment
Following examples for illustration of the present invention and uses thereof, but are not used for limiting the scope of the invention.
Embodiment one
Ferro-silicon nitride, aluminum shot are carried out fragmentation, screening respectively, obtains the particle of 3 ~ 5mm granularity, and carry out the process of rolling ball making process to screen underflow, the particle making 3 ~ 5mm granularity reclaims; The ferro-silicon nitride particle obtained and aluminum shot being mixed by the mass ratio of 87:13, getting product for sealing in standard loads fire-resistant moisture-proof packing bag with 10kg/ bag.
Embodiment two
Ferro-silicon nitride, aluminum shot are carried out fragmentation, screening respectively, obtains the particle of 3 ~ 5mm granularity, and carry out the process of rolling ball making process to screen underflow, the particle making 3 ~ 5mm granularity reclaims; The ferro-silicon nitride particle obtained and aluminum shot being mixed by the mass ratio of 90:10, getting product for sealing in standard loads fire-resistant moisture-proof packing bag with 10kg/ bag.
Test example
Embodiment one gained finished product is used for HRB400 to produce, and tests content and the yield strength of nitrogen in Different adding amount gained steel, test result is as shown in table 1:
Table 1
As can be seen from Table 1, when silicon nitrogen aluminium alloy additive addition is more than 0.3kg/t, gained steel yield strength reaches 400MPa, meets the requirement of HRB400 to yield strength; Along with the increase of silicon nitrogen aluminium alloy additive add-on, the nitrogen content of gained steel increases, yield strength increases, GB GB1499.2-07 standard specifies that the nitrogen content in Deformed Steel Bars is not more than 120PPm, add the silicon nitrogen aluminium alloy of 0.7kg/t, Control of Nitrogen Content in Deformed Steel Bars, at about 110PPm, both met Standard, and the advantage of this product can be made again to maximize.
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here cannot give exhaustive to all embodiments.Every belong to technical scheme of the present invention the apparent change of extending out or variation be still in the row of protection scope of the present invention.
Claims (5)
1. a silicon nitrogen aluminium alloy additive, is characterized in that: described silicon nitrogen aluminium alloy additive is made up of ferro-silicon nitride and aluminum shot, and the mass ratio of ferro-silicon nitride and aluminum shot is 87:13-90:10.
2. want a kind of silicon nitrogen aluminium alloy additive described in 1 according to right, it is characterized in that: in described silicon nitrogen aluminium alloy additive, silicone content is 40.9-45.9wt%, nitrogen content is 26.1-28.8wt%, aluminium content is 9.7-12.9wt%, iron level is 11.3-13.5wt%, and surplus is inevitable impurity.
3. a preparation method for silicon nitrogen aluminium alloy additive, is characterized in that, the concrete steps of described method are as follows:
(1) ferro-silicon nitride, aluminum shot are carried out fragmentation, screening respectively, obtain the particle of 3 ~ 5mm granularity, and carry out the process of rolling ball making process to screen underflow, the particle making 3 ~ 5mm granularity reclaims;
(2) the ferro-silicon nitride particle obtained in step (1) and aluminum shot are mixed by the mass ratio of 87:13-90:10;
(3) product that step (2) obtains is loaded sealing in fire-resistant moisture-proof packing bag to get product.
4. the preparation method of a kind of silicon nitrogen aluminium alloy additive according to claim 3, it is characterized in that: in described ferro-silicon nitride, silicone content is 47-51wt%, nitrogen content is 30-32wt%, and iron level is 13-15wt%.
5. the preparation method of a kind of silicon nitrogen aluminium alloy additive according to claim 3, is characterized in that: in described aluminum shot, aluminium content is 98-99wt%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111826498A (en) * | 2020-07-31 | 2020-10-27 | 唐山飞迪冶金材料有限公司 | Additive for increasing strength of deformed steel bar and preparation method and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111826498A (en) * | 2020-07-31 | 2020-10-27 | 唐山飞迪冶金材料有限公司 | Additive for increasing strength of deformed steel bar and preparation method and application thereof |
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Application publication date: 20151209 |