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The process of smelting precipitation hardening steel by vacuum decarburization furnace

A technology of vacuum decarburization and precipitation hardening, applied in the field of steelmaking, can solve the problems of long refining and smelting cycle, high cost and inability to guarantee, and achieve the effect of shortening refining cycle, reducing dosage and reducing control cost.

Active Publication Date: 2019-03-22
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The smelting method with short refining and smelting period of the existing process route cannot guarantee the amount of [H], and the smelting method with guaranteed [H] content has a long refining and smelting period and high cost

Method used

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  • The process of smelting precipitation hardening steel by vacuum decarburization furnace
  • The process of smelting precipitation hardening steel by vacuum decarburization furnace
  • The process of smelting precipitation hardening steel by vacuum decarburization furnace

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Embodiment

[0026] Embodiment: The present invention adopts the process route of 60tEAF / 10tIF-60tLF-60tVOD-IC, the composition is as follows: [C]≤0.07%, [Si]≤1.0%, [Mn]≤1.0%, [P]≤0.030%, [S]≤0.010%, [Ni]: 3.50-5.00%, [Cr]: 14.0-15.5%, [Cu]: 3.00-5.00%, [Nb]: 0.15-0.45%, [H]≤2.0ppm; VOD: Vacuum Decarburization Furnace; VCD: Vacuum Oxygen Decarburization; Success Mark: The chemical elements completely meet the technical requirements, which means success, and the short smelting time is the characteristic of relatively common smelting methods. The process route is: 60tEAF / 10tIF-60tLF-60tVOD-IC. The raw materials for the production process of the invention are high-quality steel scrap, pig iron, sponge iron, carburizer, ferrochrome, copper plate, nickel plate and ferromanganese. During the micro-adjustment process of the LF furnace alloy, the medium-carbon ferromanganese is used to adjust the Mn content to reduce the production cost. The VOD furnace adopts ten steps of "preparation-calculati...

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Abstract

The invention discloses a process for smelting precipitation-hardening steel through a vacuum decarburization furnace, and the process is high in production efficiency and shorts refining smelting time. The process raw materials are high-quality waste steel, pig iron, sponge iron, a carburant, ferrochrome, a copper plate, a nickel plate, and ferromanganese; in an LF furnace alloy micro-regulatingprocess, Mn content is regulated through middle-carbon ferromanganese, so that the production cost is reduced; a VOD furnace adopts ten steps of preparing, calculating oxygen gas amount, starting a pump, primarily blowing oxygen, blowing oxygen, stopping oxygen, transferring to a VCD stage, relieving a vacuum stage, sampling and measuring a temperature and vacuum-reducing, and sampling-tapping tooperate, so that [H] content can be guaranteed, the refining period can be shortened, and a C content hit rate further can be effectively guaranteed; and waste heat is utilized for reducing under vacuum, so that gas content is favorably reduced and the cost is favorably controlled. The process is suitable for smelting stainless steel with Mn content lower than 2.00%.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and relates to a process for smelting precipitation-hardened steel in a vacuum decarburization furnace with high production efficiency and shortened refining and smelting time. Background technique [0002] Precipitation hardening steel 05Cr15Ni5Cu4Nb has good corrosion resistance and is characterized by precipitation hardening. It is widely used in offshore platforms, food manufacturing, aerospace and other fields. The smelting method with short refining and smelting cycle of the existing process route cannot guarantee the amount of [H], and the smelting method with guaranteed [H] content has a long refining and smelting cycle and high cost. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a process for smelting precipitation-hardened steel using a vacuum decarburization furnace that can not only ensure the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10C21C7/068C21C5/52
CPCY02P10/20
Inventor 李玉标王怡群李立新双伟鹏张凯亮李占华姚伟艾俊林胡建成金会业吕楠
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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