阅读说明：本技术 一种低铝控硅钢大钢锭的制造方法 (A kind of manufacturing method of low aluminium control silicon steel large steel ingot ) 是由 杨海石 *** 乔麟淞 王紫林 高峰 李荣斌 于 2019-10-10 设计创作，主要内容包括：本发明涉及钢锭制造技术领域,公开了一种低铝控硅钢大钢锭的制造方法,所述制造方法包括如下步骤：步骤一：电炉配料,步骤二：电炉冶炼,步骤三：精炼,步骤四：初步加合金,步骤五：真空处理,步骤六：二次加合金,步骤七：精炼包真空吹氩精炼包真空吹氩浇注。本发明适用于一种低铝控硅钢大钢锭的制造方法,采用本发明制造方法制造的低铝控硅钢大钢锭,成分全部满足规范要求,Al含量控制在0.05％左右,钢水纯净度大幅提升,其氧含量从以往的20ppm降低至10ppm,C类夹杂物含量由以往1～1.5级降低至0.5～1级,其余几类夹杂物含量由0.5～1级降低直0～0.5级,探伤合格率由以往不到80％提升至95％以上。(The present invention relates to steel ingot manufacturing technology fields, disclose a kind of manufacturing method of low aluminium control silicon steel large steel ingot, the manufacturing method includes the following steps: step 1: electric furnace ingredient, step 2: electric furnace smelting, step 3: refining, step 4: step 5: preliminary adduction gold is vacuum-treated, step 6: secondary adduction gold, step 7: refining packet vacuum argon blowing refining packet vacuum argon blowing casting.The present invention is suitable for a kind of manufacturing method of low aluminium control silicon steel large steel ingot, the low aluminium control silicon steel large steel ingot manufactured using manufacturing method of the present invention, ingredient all meets code requirement, Al content is controlled 0.05% or so, Molten Steel Cleanliness is substantially improved, its oxygen content is reduced to 10ppm from previous 20ppm, C type impurity content is reduced to 0.5~1 grade by previous 1~1.5 grade, remaining a few type impurity content reduces straight 0~0.5 grade by 0.5~1 grade, and flaw detection qualification rate is by being promoted to 95% or more less than 80% in the past.)

1. a kind of manufacturing method of low aluminium control silicon steel large steel ingot, which is characterized in that the manufacturing method includes the following steps:

Step 1: this steel grade is added into electric furnace and returns to 78 tons of material, 25 tons of conversion pig and ferrosilicon 500kg for electric furnace ingredient；

Step 2: electric furnace smelting drops to 0.15% when P class sundries content drops to 0.004%, C class sundries content, and temperature is big When 1650 DEG C, EBT carries out card slag and puts steel into refining packet；

Step 3: after refining packet enters the station, C powder, silicon calcium powder, pulverized limestone and fluorite is added in refining, and maximum power energization slugging is gone back Original adds aluminium powder and carbon dust ten minutes later, continues heating reduction 30 minutes；

Step 4: preliminary adduction gold, thermometric, sampling are warming up to 1650 DEG C, alloy in addition to silicon are added, after being warming up to 1650 DEG C, Ferrosilicon is added；

Step 5: being vacuum-treated, and ladle is moved to vacuum station and is vacuum-treated, and vacuum degree is down to 133Pa hereinafter, keeping argon gas stream Amount 250~350L/min of control, molten steel expose the top of the slag, are vacuum-treated 30~35 minutes；

Step 6: ladle is moved back to heating station, is warming up to 1625 DEG C, calcium-silicon 50kg is added, adjusts argon by secondary adduction gold Throughput is hung out to 60L/min, soft blow 10min；

Step 7: refining packet vacuum argon blowing refining packet vacuum argon blowing casting carries out 2 external drainages, sliding plate blowing to refining water-coating port Argon when vacuum tank is evacuated to 65Pa or less, opens water-gap pouring, while argon blowing, argon gas by ladle seat on vacuum tank Pressure 1MPa after pouring molten steel to riser target position, closes the mouth of a river, destroys vacuum, first exothermic mixture 50kg, ladle is added Second batch exothermic mixture 250kg is added by sieve after calling away, is demoulded after 26 hours, hot sending to forge.

2. a kind of manufacturing method of low aluminium control silicon steel large steel ingot according to claim 1, which is characterized in that in step 2, Pre-deoxidant is added during putting steel: slag charge: 500kg lime is added in the calcium-silicon of 1.5kg/t steel.

3. a kind of manufacturing method of low aluminium control silicon steel large steel ingot according to claim 1 or 2, which is characterized in that step 2 In, there is slag phenomenon when putting steel process, refining furnace, which does not restore, is warming up to 1620 DEG C or more, carries out converting packet card slag operation.

4. a kind of manufacturing method of low aluminium control silicon steel large steel ingot according to claim 1, which is characterized in that in step 3, C Powder weight is 50kg, and silicon calcium powder weight is 150kg, and pulverized limestone weight is 1600kg, and fluorite weight is 700kg.

5. a kind of manufacturing method of low aluminium control silicon steel large steel ingot according to claim 4, which is characterized in that in step 3, Aluminium powder weight is 30kg, and carbon dust weight is 50kg.

6. a kind of manufacturing method of low aluminium control silicon steel large steel ingot according to claim 1, which is characterized in that in step 6, Work as H:1.0ppm, activity oxygen a (O): is heated up and be added again calcium-silicon after 5.9ppm.

7. a kind of manufacturing method of low aluminium control silicon steel large steel ingot according to claim 1, which is characterized in that in step 7, Suitable carbonization rice husk is added as coverture.

Technical field

The present invention relates to steel ingot manufacturing technology field, the manufacturing method of specifically a kind of low aluminium control silicon steel large steel ingot.

Background technique

Low aluminium control silicon steel, i.e. Si killed steel, Al content generally requires≤0.010%, in smelting process, can not use Al carries out deoxidation, otherwise easily causes Al content exceeded, and simple Si deoxidation, since its deoxidizing capacity limits, deoxidation effect Fruit is not especially good, and deoxidation products is relatively single, is not easy discharge of floating.And Si killed steel, in casting process easily It by secondary oxidation, ultimately causes that product oxygen content is higher, and inclusion content is high, and there is UT to detect a flaw underproof situation hair often It is raw.

The Si killed steel that our company often produces, such as 30Cr1Mo1V High inter case, flaw detection requires relatively high, flaw detection conjunction Lattice rate is relatively low, generally 80% hereinafter, only 50% or so when minimum.

Low aluminium control silicon steel, general large steel ingot are vacuum-treated molten steel in refining, are poured in using using double vacuum technologies Between packet sealing vacuum pouring, conditions permit, carry out stopper rod Argon.

Summary of the invention

The present invention provides a kind of manufacturing method of low aluminium control silicon steel large steel ingot, solves mentioned above in the background art ask Topic.

To achieve the above object, the invention provides the following technical scheme:

A kind of manufacturing method of low aluminium control silicon steel large steel ingot, the manufacturing method include the following steps:

Step 1: this steel grade is added into electric furnace and returns to 78 tons of material, 25 tons of conversion pig and ferrosilicon 500kg for electric furnace ingredient；

Step 2: electric furnace smelting drops to 0.15% when P class sundries content drops to 0.004%, C class sundries content, temperature When degree is greater than 1650 DEG C, EBT carries out card slag and puts steel into refining packet；

Step 3: it is energization that C powder, silicon calcium powder, pulverized limestone and fluorite, maximum power is added after refining packet enters the station in refining Slag, reduction add aluminium powder and carbon dust ten minutes later, continue heating reduction 30 minutes；

Step 4: preliminary adduction gold, thermometric, sampling are warming up to 1650 DEG C, alloy in addition to silicon are added, is warming up to 1650 After DEG C, ferrosilicon is added；

Step 5: being vacuum-treated, and ladle is moved to vacuum station and is vacuum-treated, and vacuum degree is down to 133Pa hereinafter, keeping argon Throughput controls 250~350L/min, and molten steel exposes the top of the slag, is vacuum-treated 30~35 minutes；

Step 6: ladle is moved back to heating station, is warming up to 1625 DEG C, calcium-silicon 50kg is added, adjusted by secondary adduction gold Whole argon flow is hung out to 60L/min, soft blow 10min；

Step 7: refining packet vacuum argon blowing refining packet vacuum argon blowing casting carries out 2 external drainages to refining water-coating port, sliding Plate Argon when vacuum tank is evacuated to 65Pa or less, opens water-gap pouring, while argon blowing by ladle seat on vacuum tank, Argon pressure 1MPa after pouring molten steel to riser target position, closes the mouth of a river, destroys vacuum, first exothermic mixture 50kg is added, After calling away by sieve second batch exothermic mixture 250kg is added in ladle, demoulds after 26 hours, hot sending is to forge.

As a preferred technical solution of the present invention, in step 2, pre-deoxidant is added during putting steel: 1.5kg/ Slag charge: 500kg lime is added in the calcium-silicon of t steel.

As a preferred technical solution of the present invention, in step 2, there is a slag phenomenon when putting steel process, refining furnace is not also Original is warming up to 1620 DEG C or more, carries out converting packet card slag operation.

As a preferred technical solution of the present invention, in step 3, C powder weight is 50kg, and silicon calcium powder weight is 150kg, pulverized limestone weight are 1600kg, and fluorite weight is 700kg.

As a preferred technical solution of the present invention, in step 3, aluminium powder weight is 30kg, and carbon dust weight is 50kg.

As a preferred technical solution of the present invention, in step 6, work as H:1.0ppm, activity oxygen a (O): after 5.9ppm Heated up and be added again calcium-silicon.

As a preferred technical solution of the present invention, in step 7, suitable carbonization rice husk is added as coverture.

The present invention has following usefulness:

The present invention is suitable for a kind of manufacturing method of low aluminium control silicon steel large steel ingot, using the low of manufacturing method of the present invention manufacture Aluminium control silicon steel large steel ingot, ingredient all meet code requirement, and Al content is controlled 0.05% or so, and Molten Steel Cleanliness substantially mentions It rises, oxygen content is reduced to 10ppm from previous 20ppm, and C type impurity content is reduced to 0.5~1 by previous 1~1.5 grade Grade, remaining a few type impurity content reduce straight 0~0.5 grade by 0.5~1 grade, and flaw detection qualification rate less than 80% by being promoted in the past 95% or more.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this hair Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root Other attached drawings are obtained according to these attached drawings.

Fig. 1 is a kind of flow chart of the manufacturing method of low aluminium control silicon steel large steel ingot.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.