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Method for horizontal continuous casting 10Cr9Mo1VNbN ferrite heat-resistant steel to tube round blank through electric stove smelting

A horizontal continuous casting and electric furnace smelting technology, which is applied in the field of iron and steel metallurgy, can solve the problems of large deformation resistance, narrow deformation temperature range, and low plasticity, and achieve the effects of improved billet quality, low production cost, and increased billet yield

Active Publication Date: 2009-03-11
衡阳华菱连轧管有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to aim at the molten steel ingot and arc-shaped continuous casting billet produced by T91 steel in the prior art due to its complex chemical composition, high alloy element content, large deformation resistance, low plasticity, and narrow deformation temperature range during thermal deformation. The difficult problem of industrial production discloses a method of using electric furnace smelting molten steel to refine it and then horizontally continuous casting it into round tube blanks

Method used

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  • Method for horizontal continuous casting 10Cr9Mo1VNbN ferrite heat-resistant steel to tube round blank through electric stove smelting
  • Method for horizontal continuous casting 10Cr9Mo1VNbN ferrite heat-resistant steel to tube round blank through electric stove smelting
  • Method for horizontal continuous casting 10Cr9Mo1VNbN ferrite heat-resistant steel to tube round blank through electric stove smelting

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Embodiment

[0017] Example: Hengyang Valin Continuous Rolling Tube Co., Ltd. adopts the method of electric furnace smelting ferritic heat-resistant steel and horizontal continuous casting to produce round tube blanks to produce 10Cr9Mo1VNbN steel with two specifications of ∮140mm and ∮120mm (see Table 1 for process parameters). The process flow is 30 tons of AC electric furnace primary refining (eccentric furnace bottom tapping, adding refining synthetic slag, various alloys, deoxidizers) → 40 tons of ladle furnace refining (bottom blowing argon) → 40 tons of vacuum furnace degassing → horizontal continuous cast. Its specific production method is as follows:

[0018] A. Input electric energy and oxygen into the electric furnace to melt the loaded charge into molten steel, control the chemical composition of the slag, input 45 cubic meters of oxygen per ton of steel, intermittently flow out the slag and add lime to control the carbon content in the molten steel ≤0.02%, phosphorus content ...

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Abstract

The invention provides a method for smelting 10Cr9Mo1VNbN ferrite refractory steel to form a circular tube billet by horizontal continuous casting in an electric furnace. The method comprises the following process flow: primary smelting in a 30-ton alternating current electric furnace (steel is tapped from the bottom of an eccentric furnace; refined pre-smelting slag, various alloys and a deoxidizer are added), a 40-ton ladle refining furnace (the bottom is blown with argon), a 40-ton vacuum furnace for degassing and horizontal continuous casting. All the alloys are roasted; the alloy roasting is carried out through the following steps: pores are pricked on an iron barrel filled with ferrochrome nitride, ferromolybdenum, ferrovanadium and ferrocolumbium; the alloys are put in a large smoke hood of the refining furnace and are roasted; micro-carbon ferrochromium is added into a ladle ahead of 60 minutes before tapping and is roasted; and the replenished micro-carbon ferrochromium after the tapping is roasted in an offline middle ladle ahead of eight hours.

Description

technical field [0001] The invention relates to a production method of electric furnace smelting and horizontal continuous casting in the technical field of iron and steel metallurgy, in particular to a method of electric furnace smelting 10Cr9Mo1VNbN ferritic heat-resistant steel and horizontal continuous casting into round tube blanks. Background technique [0002] 10Cr9Mo1VNbN steel is an alloy structural steel grade in GB 5310 seamless steel pipe for high-pressure boilers. Its composition refers to ASME SA-213 T91 steel. It is a ferritic heat-resistant steel. It is referred to as " T91". The steel pipe rolled by T91 steel is used as the heating surface pipe and steam pipe of the supercritical pressure unit of the nuclear power plant. The wall temperature can reach up to 650 ℃, and the steam pressure is above 24MPa, showing excellent comprehensive performance. It was first used in European and American nuclear power plant units. put into use. my country introduced this ...

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Application Information

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IPC IPC(8): C21C5/52C21C5/54C21C7/10C21C7/064B22D11/00B22D11/18B22D11/115B22D11/22
CPCY02P10/20
Inventor 肖鸿光田汉蒲左著宁建成李阳华
Owner 衡阳华菱连轧管有限公司
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