Method for smelting ultra-low carbon stainless steel in vacuum induction furnace

A vacuum induction furnace and ultra-low carbon technology, which is applied in the field of vacuum induction furnace smelting, can solve the problems of smelting ultra-low carbon stainless steel without a vacuum induction furnace and other problems, and achieve the effect of ensuring the decarburization effect.

Active Publication Date: 2022-02-11
CHONGQING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Among the currently disclosed technologies, there is no detailed introductio

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  • Method for smelting ultra-low carbon stainless steel in vacuum induction furnace
  • Method for smelting ultra-low carbon stainless steel in vacuum induction furnace
  • Method for smelting ultra-low carbon stainless steel in vacuum induction furnace

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Embodiment 1

[0034] This embodiment adopts a vacuum induction furnace with a rated capacity of 50kg, its rated power is 140kw, and the ultimate vacuum degree is 6.67×10 -2 Pa, the chemical composition and target content of ultra-low carbon stainless steel are shown in Table 1. The smelting steps are as follows:

[0035] (1) Before smelting, bake and dry industrial pure iron, metal chromium, ferromolybdenum, iron ore, nickel plate, ferroniobium, and metal titanium at 120-180°C for 4-6 hours.

[0036] (2) Arrange 5kg of small pieces of industrial pure iron and 0.5kg of nickel plate at the bottom of the crucible, 1.25kg of ferromolybdenum with a molybdenum content of 60% is placed in the middle, and 28kg of industrial pure iron is placed in the upper part; 0.05kg of iron ore, 16kg of metal chromium, 0.02 kg of aluminum particles, 0.125kg of ferroniobium, and 0.025kg of titanium metal are put into the distribution bin.

[0037] (3) Vacuumize to 10Pa and power on, and all the raw materials in...

Embodiment 2

[0047] This embodiment adopts a vacuum induction furnace with a rated capacity of 500kg, its rated power is 400kw, and the ultimate vacuum degree is 6.67×10 -2 Pa, the chemical composition and target content of ultra-low carbon stainless steel are shown in Table 2. The smelting steps are as follows:

[0048](1) Before smelting, bake and dry industrial pure iron, metal chromium, ferromolybdenum, iron ore, nickel plate, ferroniobium, and metal titanium at 120-180°C for 4-6 hours.

[0049] (2) 50kg of small pieces of industrial pure iron and 2.5kg of nickel plate are arranged at the bottom of the crucible, 8.33kg of ferromolybdenum with a molybdenum content of 60% is placed in the middle, and 342.17kg of industrial pure iron is placed in the upper part; 0.5kg of iron ore, 98kg of metal chromium, 0.2kg of aluminum pellets, 2.08kg of ferroniobium, and 0.5kg of titanium metal are put into the distribution bin.

[0050] (3) Vacuumize to 8Pa and power on, and after 2.5 hours, all th...

Embodiment 3

[0060] In this embodiment, a vacuum induction furnace with a rated capacity of 1t is used, with a rated power of 750kw and a limit vacuum of 0.1Pa. The chemical composition and target content of ultra-low carbon stainless steel are shown in Table 3. The smelting steps are as follows:

[0061] (1) Before smelting, bake and dry industrial pure iron, metal chromium, ferromolybdenum, iron ore, nickel plate, ferroniobium, and metal titanium at 120-180°C for 4-6 hours.

[0062] (2) 200kg of small pieces of industrial pure iron and 8kg of nickel plate are arranged at the bottom of the crucible, 8.34kg of ferromolybdenum with a molybdenum content of 60% is placed in the middle, and 675.26kg of industrial pure iron is placed in the upper part; 1.5kg of iron ore, 105kg of metallic chromium, 0.6 kg of aluminum particles, 6.67kg of ferroniobium, and 1.5kg of titanium metal are put into the distribution bin.

[0063] (3) Vacuumize to 5Pa and power on, and all the raw materials in the cruc...

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Abstract

The invention relates to a method for smelting ultra-low carbon stainless steel in a vacuum induction furnace. The method comprises the steps of filling raw materials required by smelting into a crucible; starting to heat after vacuumizing until the raw materials are melted down; reducing the vacuum degree, and adding iron ore into the molten steel till [C] is less than or equal to 0.01 wt%; stopping vacuum, adding aluminum until [O] is less than or equal to 0.002 wt%, starting a vacuum pump, and pre-degassing until [N] is less than or equal to 0.002 wt%; adding metal chromium, heating after melting down, and carrying out vacuum final degassing until [N] is less than or equal to 0.003 wt%; cutting off power to form a film, introducing argon, alloying Nb and Ti elements, adding an alloy, switching to a stirring power supply, and electrifying to melt down; and raising the temperature to 30-60 DEG C above the molten steel liquidus temperature, and carrying out electrified tapping. According to the method, the harmful element C is effectively reduced through iron ore decarburization, excessive acid-soluble aluminum can be volatilized through high-vacuum degassing, N, O and H can be reduced, the cleanliness of the steel is improved, and it can be guaranteed that the component structure of a steel ingot is more uniform through low-liquidus casting.

Description

technical field [0001] The invention belongs to the technical field of vacuum induction furnace smelting, and in particular relates to a method for smelting ultra-low-carbon stainless steel in a vacuum induction furnace. Background technique [0002] In addition to high corrosion resistance, ultra-low carbon stainless steel also has good cold working performance and welding performance. It is widely used in energy, environmental protection, petrochemical, food and other industries. The metallurgical process is generally completed by electric furnace + LF + VOD. The process is relatively long, and requires relatively high levels of equipment and process technology. It is difficult to smelt stainless steel with a mass fraction of Cr of 20% to 30%, mainly due to problems such as difficult alloying and difficult decarburization and nitrogen removal. [0003] Among the disclosed technologies, the invention patent with application number 201410471330.9 discloses a new smelting met...

Claims

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Application Information

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IPC IPC(8): C22C33/06C22C38/44C22C38/48C22C38/50C21C7/00C21C7/06C21C7/068C21C7/10
CPCC22C33/06C22C38/004C22C38/44C22C38/50C22C38/48C21C7/10C21C7/0685C21C7/06C21C7/0006
Inventor 张福利侯自兵徐于斌郭东伟王育飞齐紫阳郭瑞华王傲
Owner CHONGQING UNIV
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