Smelting method of ultralow manganese steel

Abstract

The invention relates to the technical field of steelmaking, in particular to a smelting method of ultralow manganese steel. According to the method, a manufacturing process paths of molten iron pretreatment, converter, LF furnace, RH production process route are adopted, and a duplex process is adopted, a full-slag and double-slag slagging technology is adopted in the converter, a special oxygensupply technology is adopted, the converter end point oxygen value is controlled to be 600-800 ppm, and a converter end point temperature is controlled to be 1660-1680 DEG C; the mass percent contentof the molten iron manganese is less than 0.16%; after Si and Mn oxidation periods, slag is discharged, and steel tapping is carried out in a boiling mode; and lime is added, phosphorus is removed andmanganese is burned under an oxidability condition; and a steel type refining rate is greatly improved, and then the ultralow manganese steel with the Mn mass percent content of less than or equal to0.025% is produced.

Description

technical field

[0001] The invention relates to the technical field of steelmaking, in particular to a method for smelting ultra-low manganese steel. Background technique

[0002] Ultra-low manganese steel is an important steel base material, mainly used for smelting various high-temperature alloys, heat-resistant alloys, precision alloys, maraging steels and other aerospace, military and civilian alloys or steels. The development is abnormally fast. In particular, the preparation technology of Mn≤0.025% steel can expand its application range and can be applied to charging pile batteries.

[0003] At present, the Mn content of molten iron in steel mills is generally high, so it is extremely difficult to produce this type of steel, and it is impossible to produce ultra-low manganese steel with a Mn mass percentage content of ≤0.025%. Contents of the invention

[0004] In order to overcome the deficiencies of the prior art, the invention provides a method for smelting ultr...

Examples

Embodiment 1

[0037] Taking the 260t converter as an example, the dual production process route of molten iron pretreatment-converter-LF furnace-RH-continuous casting is adopted, including the following steps:

[0038] Step 1. Preparation

[0039] Before the production of this steel type, it is necessary to produce one pour (6 cans) of ultra-low carbon steel, and the steel ladle of these 6 cans of steel is used for the next pour of ultra-low manganese steel to ensure the cleanliness of the steel ladle.

[0040] Before the production of this steel type, one pour (6 cans) of ultra-low carbon steel should be produced. The composition requirements of ultra-low carbon steel are shown in Table 1:

[0041] Table 1 Ultra-low carbon steel composition table Unit: mass percentage content

[0042]

[0043] Step 2. Hot metal pretreatment

[0044] 1. Iron selection target: molten iron temperature 1350°C, molten iron Si mass percentage content 0.45%, molten iron Mn mass percentage content 0.15%, molt...

Embodiment 2

[0066] Taking the 260t converter as an example, the dual production process route of molten iron pretreatment-converter-LF furnace-RH-continuous casting is adopted, including the following steps:

[0067] Step 1. Preparation

[0068] Before the production of this steel type, it is necessary to produce one pour (6 cans) of ultra-low carbon steel, and the steel ladle of these 6 cans of steel is used for the next pour of ultra-low manganese steel to ensure the cleanliness of the steel ladle.

[0069] Before the production of this steel type, one pour (6 cans) of ultra-low carbon steel should be produced. The composition requirements of ultra-low carbon steel are shown in Table 1:

[0070] Table 2 Ultra-low carbon steel composition table Unit: mass percentage content

[0071]

[0072] Step 2. Hot metal pretreatment

[0073] 1. Iron selection target: molten iron temperature 1350°C, molten iron Si mass percentage content 0.45%, molten iron Mn mass percentage content 0.15%, molten...

technical field

[0001] The invention relates to the technical field of steelmaking, in particular to a method for smelting ultra-low manganese steel. Background technique

[0002] Ultra-low manganese steel is an important steel base material, mainly used for smelting various high-temperature alloys, heat-resistant alloys, precision alloys, maraging steels and other aerospace, military and civilian alloys or steels. The development is abnormally fast. In particular, the preparation technology of Mn≤0.025% steel can expand its application range and can be applied to charging pile batteries.

[0003] At present, the Mn content of molten iron in steel mills is generally high, so it is extremely difficult to produce this type of steel, and it is impossible to produce ultra-low manganese steel with a Mn mass percentage content of ≤0.025%. Contents of the invention

[0004] In order to overcome the deficiencies of the prior art, the invention provides a method for smelting ultr...

Examples

Embodiment 1

[0037] Taking the 260t converter as an example, the dual production process route of molten iron pretreatment-converter-LF furnace-RH-continuous casting is adopted, including the following steps:

[0038] Step 1. Preparation

[0039] Before the production of this steel type, it is necessary to produce one pour (6 cans) of ultra-low carbon steel, and the steel ladle of these 6 cans of steel is used for the next pour of ultra-low manganese steel to ensure the cleanliness of the steel ladle.

[0040] Before the production of this steel type, one pour (6 cans) of ultra-low carbon steel should be produced. The composition requirements of ultra-low carbon steel are shown in Table 1:

[0041] Table 1 Ultra-low carbon steel composition table Unit: mass percentage content

[0042]

[0043] Step 2. Hot metal pretreatment

[0044] 1. Iron selection target: molten iron temperature 1350°C, molten iron Si mass percentage content 0.45%, molten iron Mn mass percentage content 0.15%, molt...

Embodiment 2

[0066] Taking the 260t converter as an example, the dual production process route of molten iron pretreatment-converter-LF furnace-RH-continuous casting is adopted, including the following steps:

[0067] Step 1. Preparation

[0068] Before the production of this steel type, it is necessary to produce one pour (6 cans) of ultra-low carbon steel, and the steel ladle of these 6 cans of steel is used for the next pour of ultra-low manganese steel to ensure the cleanliness of the steel ladle.

[0069] Before the production of this steel type, one pour (6 cans) of ultra-low carbon steel should be produced. The composition requirements of ultra-low carbon steel are shown in Table 1:

[0070] Table 2 Ultra-low carbon steel composition table Unit: mass percentage content

[0071]

[0072] Step 2. Hot metal pretreatment

[0073] 1. Iron selection target: molten iron temperature 1350°C, molten iron Si mass percentage content 0.45%, molten iron Mn mass percentage content 0.15%, molten...

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