CN101050480A

CN101050480A - Complex ferroalloy of aluminum, nickel, copper with lower carbon and silicon in use for final steelmaking deoxidizer

Info

Publication number: CN101050480A
Application number: CN 200710011258
Authority: CN
Inventors: 李兴有
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-05-11
Filing date: 2007-05-11
Publication date: 2007-10-10

Abstract

This invention relates to a final deoxidizer for steelmaking, which is low-C and low-Si Al-Ni-Cu alloy. The alloy comprises: C less than or equal to 0.3 wt.%, Si less than or equal to 1 wt.%, S less than or equal to 0.03 wt.%, Al 5-40 wt.%, Ni 15-65 wt.%, Cu 15-65 wt.%, and Fe as balance. The alloy has such advantages as low melting point, high specific gravity, no pulverization, no impurities, easy operation, good deoxidation effect, high Ni and Cu yields (100%), and high steel qualification rate. The alloy is added into molten steel after discharge from furnace, thus can prevent steel quality deterioration. Besides, adding the alloy after discharge from furnace does not influence normal production time, and is good to furnace body.

Description

Be used to make steel the end-deoxidizer complex ferroalloy of aluminum, nickel, copper with lower carbon and silicon

Technical field

The present invention relates to field of metallurgy steely iron alloy, be specially a kind of end-deoxidizer complex ferroalloy of aluminum, nickel, copper with lower carbon and silicon that is used to make steel.

Background technology

Along with the develop rapidly of China's all trades and professions, the demand rolling shapes are many, and quality also will be got well, the market competition strength of steel industry is very strong, and what bring is the steel-making end-deoxidizer thereupon, should degree of depth deoxidation, satisfy simultaneously the steel grades requirement of alloy part element again, difficulty is bigger.

Silico-calcium, Alsimin are done the end-deoxidizer of steel-making usefulness, effect is generally acknowledged, the complex deoxidizer for steelmaking of Chu Xianing generally all contained silicon in recent years, though this type of siliceous reductor has deoxidation effect preferably, but steel grade with the smelting requirements good toughness, when the composition that contains silicon in the steel is higher, the toughness of steel is reduced.

In addition, the steel grade of smelting low carbon, low silicon, the composition of stokehold steel is qualified, and still one adds end-deoxidizer, again C, Si is increased up, also will carry out refining treatment then, influences the quality of steel, increases the treatment time and increases cost.

Summary of the invention

The object of the present invention is to provide a kind of end-deoxidizer complex ferroalloy of aluminum, nickel, copper with lower carbon and silicon that is used to make steel, solution contains the low alloy steel of Ni and Cu content, the bad problem of final deoxygenation effect that the alloy steel grade exists, be applicable to require Als content in the low-carbon low-silicon steel, require simultaneously to contain in the steel on the low alloy steel, alloy steel grade of Ni and Cu.

Technical scheme of the present invention is:

Be used to make steel the end-deoxidizer complex ferroalloy of aluminum, nickel, copper with lower carbon and silicon, by weight percentage, C≤0.3; Si≤1; S≤0.03; Al 5-40; Ni 15-65; Cu 15-65; The Fe surplus.

Describedly be used to make steel the end-deoxidizer complex ferroalloy of aluminum, nickel, copper with lower carbon and silicon, by weight percentage, preferred component is: C≤0.3; Si≤1; S≤0.03; Al 10-20; Ni 20-45; Cu 20-45; The Fe surplus.

The invention has the beneficial effects as follows:

1, the present invention develops complex ferroalloy of aluminum, nickel, copper with lower carbon and silicon, the needs of steel mill have been satisfied, again because tapping can add in big jar behind this reductor stove, can greatly reduce the system steel time, reduce the technological operation program, beneficial to body of heater again simultaneously, reduce ton steel cost again, can solve smelting requirements Als and low carbon low silicon and contain problems such as Ni, Cu element.

2, composite deoxidant fusing point of the present invention low, than great, not efflorescence easily stores and transports.

3, composite deoxidant of the present invention is easy to use, can add in the jar, shortens the heat, and simplifies technological operation.

4, composite deoxidant of the present invention uses deoxidation effect good, and the recovery rate of Ni, Cu can reach 100%, and steel grade is smelt the rate height.

5, after the neat use of complex deoxidization of the present invention, molten steel is pure, and is pollution-free, and steel is pure, and steel product quality is good, long service life, and social benefit is good.

6, refining in the past contains the steel grade of Ni, Cu, and these two kinds of alloys all will add in the stove when adding cold burden, do not become if the later stage is subjected to various reasons to influence refining, and it is big to cause damage, and it is passive that organization of production is caused, and enterprises' loss is huge.Use this alloy instead, add in big jar when tapping behind the stove, just can prevent that such accident from taking place, and add the time that does not influence ordinary production behind the stove, give scheduling and crane operation is reduced trouble and the time, and very beneficial to body of heater, can bring very big benefit to enterprise.

Embodiment

One, the technical indicator of complex ferroalloy of aluminum, nickel, copper with lower carbon and silicon (wt%):

C	Si	S	Al	Ni	Cu	Fe	Proportion (g/cm ³)	Fusing point (℃)	Granularity (mm)
C	Si	S	Al	Ni	Cu	Fe	Proportion (g/cm ³)	Fusing point (℃)	Granularity (mm)	≤0.3	≤1	≤0.03	5-40	15-65	15-65	Surplus	3.2-4.8	1150-1250	30-80

Two, manufacturing processed

The present invention adopts the main frequency furnace explained hereafter, and the raw material composition is by weight percentage: Al 8-45, Ni15-68, Cu 15-68, Fe 10-60; Select materials and implement the fine fodder policy, in proportion preparation meticulously.Be placed on and smelt syntheticly in the main frequency furnace, will check the adjustment composition in the smelting process, tap a blast furnace after qualified, slag hitting, ingot casting, put in storage, pack, freight after taking a sample respectively, chemically examine by stove again steel mill and storage.

Three, service condition

Product of the present invention can be in the enterprising enforcement usefulness of the top-blown oxygen converter of 40t, 100t, 170t, and the steel grade of smelting is many.As: 09CuPCrNiB, 09CuPCrNiA, 10CrNiCuPA, 907A, HQ60A, HQ70A, HQ70B etc.

Four, use

(1) is applicable to low-carbon low-silicon steel, requires Als content in the steel, require simultaneously to contain in the steel on the low alloy steel, alloy steel grade of Ni and Cu content.

(2) be applicable to that smelting railway, shipbuilding, military project, space flight etc. are with on the steel.

(3) be applicable on the steel grade of smelting particular requirement.

Embodiment 1

By weight percentage, chemical ingredients is as follows:

C 0.11; Si 0.48; S 0.019; Al 5; Ni 25; Cu 25; The Fe surplus.

Above-mentioned alloy is used for the end-deoxidizer of 907A steel, taps in big jar, 1/4 o'clock begins to add, and waits molten steel to go out to big jar and adds in 3/4 o'clock, take the pushing off the slag tapping, the tapping product are big, change repairing, reduce slag and flow in big jar, lay a solid foundation to furnace rear refining, result of use is good.

Steel grade 907A composition (wt%) and performance in the present embodiment:

C	Si	Mn	P	S	Ni	Cr	Cu
C	Si	Mn	P	S	Ni	Cr	Cu	0.08	0.92	0.68	0.025	0.018	0.89	0.80	0.49
Yield strength (MPa)	Tensile strength (MPa)	Elongation (%)	HB	HRB	HV			0.08	0.92	0.68	0.025	0.018	0.89	0.80	0.49
Yield strength (MPa)	Tensile strength (MPa)	Elongation (%)	HB	HRB	HV			342	645	53	167	80	179

Embodiment 2

By weight percentage, chemical ingredients is as follows:

C 0.17; Si 0.61; S 0.016; Al 10; Ni 15; Cu 15; The Fe surplus.

Embodiment 3

By weight percentage, chemical ingredients is as follows:

C 0.13; Si 0.71; S 0.012; Al 15; Ni 20; Cu 26; The Fe surplus.

Embodiment 4

By weight percentage, chemical ingredients is as follows:

C 0.15; Si 0.62; S 0.013; Al 30; Ni 30; Cu 35; The Fe surplus.

Embodiment 5

By weight percentage, chemical ingredients is as follows:

C 0.18; Si 0.59; S 0.014; Al 40; Ni 25; Cu 25; The Fe surplus.

Embodiment 6

By weight percentage, chemical ingredients is as follows:

C 0.17; Si 0.49; S 0.018; Al 8; Ni 65; Cu 15; The Fe surplus.

Embodiment 7

By weight percentage, chemical ingredients is as follows:

C 0.13; Si 0.81; S 0.012; Al 10; Ni 15; Cu 65; The Fe surplus.

Embodiment 8

By weight percentage, chemical ingredients is as follows:

C 0.17; Si 0.63; S 0.016; Al 5; Ni 45; Cu 45; The Fe surplus.

And in the prior art, C, P, S content height in the deoxidier affect the quality of steel and increase the processing time, strengthen steel-making cost. End-deoxidizer of the present invention uses easy to operate, deoxidation effect is good, yield of alloy is high, and steel grade is smelt the rate height, and steel quality is good, and the dissolved oxygen in the reduction steel, reduce nonmetallic inclusionsin steel, crystal grain thinning, inherent quality and the service life of improving steel, satisfy user's demand, play again the effect of upgrading consumption reduction. Compared with prior art, cost reduces greatly.

Claims

1, be used to make steel the end-deoxidizer complex ferroalloy of aluminum, nickel, copper with lower carbon and silicon, it is characterized in that, by weight percentage, C≤0.3; Si≤1; S≤0.03; Al 5-40; Ni 15-65; Cu 15-65; The Fe surplus.