阅读说明：本技术 一种降低炼钢Mn合金化成本的方法 (Method for reducing steel-making Mn alloying cost ) 是由 彭友全 喻林 张威 卓钧 黄汝铿 郭振宇 谢林超 于 2020-12-07 设计创作，主要内容包括：本发明提供了一种降低炼钢Mn合金化成本的方法,包括以下步骤：a)根据不同含锰合金的单价、合金成分、合金收得率,分别计算出各种类含锰合金的个锰成本、吨合金C元素增量和吨合金P元素增量；b)对待炼钢种的成分配加目标和初始钢水成分进行分析后,按照个锰成本由低到高的顺序选择加入的含锰合金种类,并控制加入含锰合金后,C元素和P元素不超过上述待炼钢种的成分配加目标,直至Mn元素符合上述待炼钢种的成分配加目标的要求,最终计算得到最低的炼钢Mn合金化成本。该降低炼钢Mn合金化成本的方法,通过对各类锰铁合金的成分及价格进行综合分析,在不增加新的投资基础上,最大程度地降低炼钢Mn合金化成本,可广泛使用于各钢铁企业。(The invention provides a method for reducing the alloying cost of steel-making Mn, which comprises the following steps: a) respectively calculating the manganese cost, the ton alloy C element increment and the ton alloy P element increment of various manganese-containing alloys according to the unit price, the alloy components and the alloy yield of different manganese-containing alloys; b) after analyzing the component addition target of the steel to be smelted and the initial molten steel components, selecting the added manganese-containing alloy types according to the sequence of the manganese cost from low to high, controlling the C element and the P element not to exceed the component addition target of the steel to be smelted after the manganese-containing alloy is added until the Mn element meets the requirement of the component addition target of the steel to be smelted, and finally calculating to obtain the lowest steel-smelting Mn alloying cost. The method for reducing the steel-making Mn alloying cost can reduce the steel-making Mn alloying cost to the maximum extent on the basis of not increasing new investment by comprehensively analyzing the components and the prices of various ferromanganese alloys, and can be widely applied to various steel enterprises.)

1. A method for reducing the alloying cost of steel-making Mn comprises the following steps:

a) respectively calculating the manganese cost, the ton alloy C element increment and the ton alloy P element increment of various manganese-containing alloys according to the unit price, the alloy components and the alloy yield of different manganese-containing alloys;

b) after analyzing the component addition target of the steel to be smelted and the initial molten steel components, selecting the added manganese-containing alloy types according to the sequence of the manganese cost from low to high, controlling the C element and the P element not to exceed the component addition target of the steel to be smelted after the manganese-containing alloy is added until the Mn element meets the requirement of the component addition target of the steel to be smelted, and finally calculating to obtain the lowest steel-smelting Mn alloying cost.

2. The method of claim 1, wherein the different manganese-containing alloys of step a) comprise two or more of the metals manganese, low-carbon ferromanganese, medium-carbon ferromanganese, high-carbon ferromanganese, and manganese-silicon alloys.

3. The method of claim 2, wherein the manganese-silicon alloy accounts for the effect of Si on individual manganese costs when calculating the individual manganese costs.

4. The method according to claim 1, wherein the manganese cost in step a) is the cost of an alloy of 0.01 wt% Mn in 1 ton of molten steel.

5. The method according to claim 1, wherein the ton of alloy C element increment in step a) is the increment of C element per ton of manganese-containing alloy added;

the increase of the P element of each ton of alloy is the increase of the P element caused by adding each ton of manganese-containing alloy.

6. The method of claim 1, wherein the calculation of each of the manganese-containing alloys in step a) further comprises:

and the increment of Si element per ton alloy and the increment of Cr element per ton alloy.

7. The method as claimed in claim 6, wherein after said adding of the manganese-containing alloy in step b), the Si element and the Cr element are controlled not to exceed the targets for the component additions of said steel grades to be smelted, and the C element and the P element are controlled not to exceed the targets for the component additions of said steel grades to be smelted.

8. The method according to claim 1, wherein the calculation in step b) is implemented by manual calculation or by a pre-written computer program.

9. The method of claim 1, wherein the calculated minimum steelmaking Mn alloying cost in step b) includes the type of manganese-containing alloy and the addition of each type of manganese-containing alloy.

Technical Field

The invention relates to the technical field of steel making, in particular to a method for reducing the Mn alloying cost of steel making.

Background

In the steel-making process, manganese is a good deoxidant and desulfurizer, the general steel contains 0.30-0.50% of manganese, and when the carbon steel is added by above 0.70%, it is called "manganese steel". The steel alloyed by manganese has enough toughness, higher strength and hardness, and the manganese can improve the quenching property of the steel and the hot workability of the steel.

The alloying cost is an important component of the steelmaking production cost, and the reduction of the alloying cost in the steelmaking process is an important way for reducing the steelmaking production cost. In the steel-making production, manganese is the most used alloying element, and the reduction of Mn alloying cost in the steel-making production process is one of the key technologies for reducing the steel-making alloying cost and the production cost.

Disclosure of Invention

In view of the above, the present invention provides a method for reducing the steel-making Mn alloying cost, which performs comprehensive analysis on the components and prices of various ferromanganese alloys to reduce the steel-making Mn alloying cost to the maximum extent without increasing new investment.

The invention provides a method for reducing the alloying cost of steel-making Mn, which comprises the following steps:

a) respectively calculating the manganese cost, the ton alloy C element increment and the ton alloy P element increment of various manganese-containing alloys according to the unit price, the alloy components and the alloy yield of different manganese-containing alloys;

b) after analyzing the component addition target of the steel to be smelted and the initial molten steel components, selecting the added manganese-containing alloy types according to the sequence of the manganese cost from low to high, controlling the C element and the P element not to exceed the component addition target of the steel to be smelted after the manganese-containing alloy is added until the Mn element meets the requirement of the component addition target of the steel to be smelted, and finally calculating to obtain the lowest steel-smelting Mn alloying cost.

Preferably, the different manganese-containing alloys in step a) include two or more of metal manganese, low-carbon ferromanganese, medium-carbon ferromanganese, high-carbon ferromanganese and manganese-silicon alloys.

Preferably, the manganese-silicon alloy needs to consider the influence of the Si element on the manganese cost when calculating the manganese cost.

Preferably, the manganese cost in step a) is the cost of an alloy with 0.01 wt% Mn in 1 ton of molten steel.

Preferably, the increase of C element of each ton of alloy in the step a) is the increase of C element caused by adding each ton of manganese-containing alloy;

the increase of the P element of each ton of alloy is the increase of the P element caused by adding each ton of manganese-containing alloy.

Preferably, the calculation items of the various kinds of manganese-containing alloys in step a) further include:

and the increment of Si element per ton alloy and the increment of Cr element per ton alloy.

Preferably, after the manganese-containing alloy is added in the step b), firstly, the Si element and the Cr element are controlled not to exceed the component addition target of the steel grade to be smelted, and then the C element and the P element are controlled not to exceed the component addition target of the steel grade to be smelted.

Preferably, the calculation in step b) is implemented by manual calculation or by a pre-written computer program.

Preferably, the calculated lowest steel-making Mn alloying cost in step b) includes the kind of the manganese-containing alloy and the addition amount of each kind of manganese-containing alloy.

The invention provides a method for reducing the alloying cost of steel-making Mn, which comprises the following steps: a) respectively calculating the manganese cost, the ton alloy C element increment and the ton alloy P element increment of various manganese-containing alloys according to the unit price, the alloy components and the alloy yield of different manganese-containing alloys; b) after analyzing the component addition target of the steel to be smelted and the initial molten steel components, selecting the added manganese-containing alloy types according to the sequence of the manganese cost from low to high, controlling the C element and the P element not to exceed the component addition target of the steel to be smelted after the manganese-containing alloy is added until the Mn element meets the requirement of the component addition target of the steel to be smelted, and finally calculating to obtain the lowest steel-smelting Mn alloying cost. Compared with the prior art, the method for reducing the alloying cost of steel-making Mn provided by the invention can reduce the alloying cost of steel-making Mn to the greatest extent on the basis of not increasing new investment by comprehensively analyzing the components and the prices of various ferromanganese alloys, and can be widely applied to various steel enterprises.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a method for reducing the alloying cost of steel-making Mn, which comprises the following steps:

a) respectively calculating the manganese cost, the ton alloy C element increment and the ton alloy P element increment of various manganese-containing alloys according to the unit price, the alloy components and the alloy yield of different manganese-containing alloys;

b) after analyzing the component addition target of the steel to be smelted and the initial molten steel components, selecting the added manganese-containing alloy types according to the sequence of the manganese cost from low to high, controlling the C element and the P element not to exceed the component addition target of the steel to be smelted after the manganese-containing alloy is added until the Mn element meets the requirement of the component addition target of the steel to be smelted, and finally calculating to obtain the lowest steel-smelting Mn alloying cost.

According to the invention, the manganese cost, the ton alloy C element increment and the ton alloy P element increment of various manganese-containing alloys are respectively calculated according to the unit price, the alloy components and the alloy yield of different manganese-containing alloys. In the present invention, the different manganese-containing alloys preferably include two or more of metal manganese, low-carbon ferromanganese, medium-carbon ferromanganese, high-carbon ferromanganese, and manganese-silicon alloys, and more preferably four of metal manganese, medium-carbon ferromanganese, high-carbon ferromanganese, and manganese-silicon alloys. The source of the different manganese-containing alloys is not particularly limited in the present invention and may be any commercially available or self-made product known to those skilled in the art. In the present invention, the above various kinds of manganese-containing alloys have large differences in composition and price, and the cost of Mn alloying in the steel-making process also has large differences.

In the preferred embodiment of the invention, the different manganese-containing alloys are four kinds of metal manganese, medium carbon ferromanganese, high carbon ferromanganese and manganese-silicon alloys; wherein the unit price of the metal manganese is 12615 yuan/ton, the Mn content is 97 wt%, and the yield is 95%; the unit price of the medium carbon ferromanganese is 8189 yuan/ton, the Mn content is 78 wt%, and the yield is 95%; the unit price of the high-carbon ferromanganese is 5840 yuan/ton, the Mn content is 74 wt%, and the yield is 95%; the unit price of the manganese-silicon alloy is 6816 yuan/ton, the Mn content is 66 wt%, the Si content is 18 wt%, and the yield is 95%.

In the invention, the influence of the Si element on the manganese cost is preferably considered when the manganese cost is calculated; the influence of the Si element on the manganese cost is mainly to reduce the manganese unit price.

In the present invention, the manganese cost is preferably an alloy cost of 0.01 wt% Mn in 1 ton of molten steel. In the present invention, the unit of the manganese cost is: meta/ton steel.

According to the invention, the manganese cost can be calculated through the unit price, alloy components and alloy yield of the manganese-containing alloy; taking metal manganese as an example, the cost of manganese can be calculated to be 1.37 yuan per ton of steel by 12615 yuan per ton of unit price, 97 wt% of Mn content and 95% of yield.

In the invention, the increment of the C element of each ton of alloy is preferably the increment of the C element caused by adding each ton of manganese-containing alloy; the increase of the P element of the ton alloy is preferably the increase of the P element caused by adding each ton of manganese-containing alloy. In the invention, the element increment of the ton alloy C and the element increment of the ton alloy P can also be obtained by calculating the unit price, the alloy components and the alloy yield of the different manganese-containing alloys; taking the example of adding high-carbon ferromanganese as an example, the content of C in the high-carbon ferromanganese is 7 wt%, the content of P in the high-carbon ferromanganese is 0.4 wt%, the amount of molten steel is 200 tons, the increment of C element in 1 ton of high-carbon ferromanganese is 0.035%, and the increment of P element is 0.002 wt%.

In the invention, the element increment of the ton alloy C and the element increment of the ton alloy P are the main factors considered in the subsequent steelmaking process; meanwhile, the calculation items of the various kinds of manganese-containing alloys preferably further include:

and the increment of Si element per ton alloy and the increment of Cr element per ton alloy.

In the invention, the increase of Si element of each ton of alloy is preferably the increase of Si element caused by adding each ton of manganese-containing alloy; the increase of the Cr element of the ton alloy is preferably the increase of the Cr element caused by adding each ton of manganese-containing alloy. In the present invention, the calculation method of the ton of Si element increment and the ton of Cr element increment is similar to the calculation method of the ton of C element increment and the ton of P element increment, and is not described herein again.

After the manganese cost, the ton alloy C element increment and the ton alloy P element increment of various manganese-containing alloys are respectively calculated, the added manganese-containing alloy types are selected according to the sequence of low manganese cost to high manganese cost after the component addition target and the initial molten steel component of a steel-making type are analyzed, the manganese-containing alloy is controlled to be added, the C element and the P element do not exceed the component addition target of the steel-making type until the Mn element meets the requirement of the component addition target of the steel-making type, and the lowest steel-making Mn alloying cost is finally calculated.

In the present invention, before selecting the added manganese-containing alloy species according to the order of the manganese cost from low to high, it is preferable that the method further comprises:

adding the alloy with Si element and/or Cr element to make the corresponding elements meet the component adding target of the steel grade to be smelted.

In a preferred embodiment of the present invention, the alloy supplemented with Si element and/or Cr element is various kinds of manganese-containing alloys; on the basis, after the manganese-containing alloy is added, the Si element and the Cr element are preferably controlled not to exceed the component addition targets of the steel to be smelted, and the C element and the P element are preferably controlled not to exceed the component addition targets of the steel to be smelted.

In another preferred embodiment of the present invention, the alloy to which the Si element and/or the Cr element is added is not a manganese-containing alloy of various kinds; on this basis, after the addition of the alloy, it is preferable to control the Si element and the Cr element not to exceed the targets of the addition of the components of the steel species to be smelted, and to control the C element and the P element not to exceed the targets of the addition of the components of the steel species to be smelted.

In the present invention, the calculation process is preferably implemented by manual calculation or by a pre-programmed computer program; for the situation that the calculation of the alloy is fine and complex, an operator cannot directly calculate by adopting a manual calculation method, engineering technicians can write the calculation method into a program, set alloy components, calculation logic, alloy element adding targets and the like, and the operator can calculate the types and the quantity of the added alloys with the optimal alloying cost by setting initial conditions.

In the present invention, the calculated lowest steel-making Mn alloying cost preferably includes the kind of the manganese-containing alloy and the addition amount of each kind of the manganese-containing alloy.

In the invention, the main process of the method for reducing the alloying cost of steel-making Mn comprises the following steps: calculating the cost of manganese, and preferentially selecting the ferromanganese with low manganese unit price for manganese addition calculation when calculating the ferromanganese; meanwhile, the increment of C element and P element contained in the alloy elements is considered, the type and the quantity of the ferromanganese alloy with the lowest cost obtained by calculation are ensured, and the controlled composition of the C element and the P element of the molten steel can be met; in the actual steel-making production process, an alloy of Si element and/or Cr element is also required to be added, so the increment of C element and P element caused by the addition of the alloy of Si element and/or Cr element is also required to be considered in the calculation process; on the basis, the surplus of the C element and the P element is calculated according to the actual conditions of the C element and the P element at the end point, the increment of the C element and the P element caused by the addition of other alloys and the control targets of the C element and the P element, and the type and the quantity of the C element and the P element used by the ferromanganese alloy with the lowest Mn alloying cost in the control target range are comprehensively calculated according to the manganese cost of various ferromanganese, the increment of the C element and the P element and the surplus of the C element and the P element after the addition of other alloys.

The method for reducing the steel-making Mn alloying cost provided by the invention can reduce the steel-making Mn alloying cost to the maximum extent on the basis of not increasing new investment by comprehensively analyzing the components and the prices of various ferromanganese alloys, and can be widely applied to various steel enterprises.

The invention provides a method for reducing the alloying cost of steel-making Mn, which comprises the following steps: a) respectively calculating the manganese cost, the ton alloy C element increment and the ton alloy P element increment of various manganese-containing alloys according to the unit price, the alloy components and the alloy yield of different manganese-containing alloys; b) after analyzing the component addition target of the steel to be smelted and the initial molten steel components, selecting the added manganese-containing alloy types according to the sequence of the manganese cost from low to high, controlling the C element and the P element not to exceed the component addition target of the steel to be smelted after the manganese-containing alloy is added until the Mn element meets the requirement of the component addition target of the steel to be smelted, and finally calculating to obtain the lowest steel-smelting Mn alloying cost. Compared with the prior art, the method for reducing the alloying cost of steel-making Mn provided by the invention can reduce the alloying cost of steel-making Mn to the greatest extent on the basis of not increasing new investment by comprehensively analyzing the components and the prices of various ferromanganese alloys, and can be widely applied to various steel enterprises.

To further illustrate the present invention, the following examples are provided for illustration.

Examples

(1) The types of the existing manganese-containing alloys in steel plants are manganese-silicon alloy, high-carbon ferromanganese, medium-carbon ferromanganese and metal manganese, and according to the alloy components and the alloy yield, the manganese cost and C, P element increment of each type of ferromanganese can be calculated as shown in the following table:

manganese-containing alloy species

Monovalent per unit

Mn content

Yield of the product

Per unit valence of manganese

Ton alloy C increase

Ton alloy P increment

Manganese-silicon alloy

6,816

66wt％

95％

1.09

0.0082wt％

0.0011wt％

High carbon ferromanganese

5,840

74wt％

95％

0.83

0.0350wt％

0.0200wt％

Medium carbon ferromanganese

8,189

78wt％

95％

1.11

0.0091wt％

0.0018wt％

Manganese metal

12,615

97wt％

95％

1.37

0.0002wt％

0.0001wt％

Note: the manganese-silicon alloy also contains 18 wt% of Si, although the unit price of the manganese is higher than that of high-carbon ferromanganese, the unit price of the manganese is considered to be lower than that of the high-carbon ferromanganese after the influence of the Si is comprehensively considered, and the manganese-silicon alloy is preferably added when the manganese alloy is calculated.

(2) The composition of the steel grades to be smelted and the composition of the initial molten steel are shown in the following table:

composition (I)	C	Si	Mn	P
					Adding target/wt%	0.070	0.2	0.97	0.017
Initial molten steel composition/wt%	0.043	0	0.03	0.013

(3) The amount of the 220 ton molten steel is calculated, and on the premise that C, P does not exceed the addition target, the addition amount of the alloy with the lowest cost can be calculated as follows: 2573Kg of manganese-silicon alloy and 615Kg of medium carbon ferromanganese; the molten steel after alloy addition comprises the following components:

composition (I)	C	Si	Mn	P
					Adding target/wt%	0.07	0.2	0.97	≤0.017
The composition of molten steel after alloying is added/wt%	0.0697	0.2	0.97	0.0169

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.