Double-phase stainless steel smelting technology

A duplex stainless steel and stainless steel technology, applied in the field of steelmaking, can solve problems such as deterioration of hot workability, decrease of thermoplasticity, and difference in deformation behavior, and achieve the effects of low brittle transition temperature, high toughness, and small tendency to hot cracking

Active Publication Date: 2015-10-21
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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Problems solved by technology

[0003] The development of duplex stainless steel is to solve the intergranular corrosion of high-carbon austenitic stainless steel. It mainly develops in two directions. One is to save nickel, and the other is to have corrosion resistance. The strength and toughness of austenite and ferrite are different, and their deformation behavior is different, which leads to the decrease of thermoplasticity of steel and the deterioration of hot workability

Method used

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Embodiment Construction

[0017] A duplex stainless steel smelting process, the chemical composition of the duplex stainless steel is as follows: C≤0.03%, Mn≤1.0%, Si≤1.0%, P≤0.030%, S≤0.010%, Cr 24.0-26.0% , Ni 6.0-8.0%, Mo 3.0-4.0%, W 0.5-1.0%, Cu 0.5-1.0%, N 0.20-0.30%, the balance is iron; and meet the pitting resistance equivalent PREN value=Cr(%)+ 3. The condition of 3Mo(%)+16N(%)≥40. It can also contain one or more components with the following weight content: Nb≤0.20%, B≤0.0035%; the following components in weight percentage are the best choices: Cr 25.0-26.0%, Mo 3.5-4.0%, N 0.25 -0.30%, and the remaining ingredients are controlled according to the middle limit.

[0018] The duplex stainless steel smelting process includes the following steps:

[0019] Step 1: Select raw materials mainly consisting of carbon steel scraps, stainless steel scraps, stainless steel shavings, and high-carbon ferrochrome, and control the total content of harmful elements As, Sn, Pb, Sb, and Bi to no more than 0.05...

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Abstract

The invention belongs to the technical field of steel smelting, and relates to a double-phase stainless steel smelting technology. According to the technology, a carbon steel material head, a stainless steel material head, stainless steel cuttings and high carbon ferro-chrome are adopted to serve as raw materials, high-chromium high-carbon molten steel is smelted through an intermediate frequency furnace, and relatively-high-cost low-carbon or micro-carbon chromium iron is not required to be adopted for smelting; after the temperature is proper, the molten steel is transferred into an AOD furnace from a steel ladle; smelting devices like the AOD furnace is adopted for conducting oxygen blowing, decarbonization and molten steel refining, and nitrogen is blown to the steel for increasing nitrogen to the steel; the cost generated by adopting nitralloy for nitrogen adding is reduced, and after the components are qualified, the steel is cast into an electrode blank; when electric slag is remelted, argon or dry air is adopted for protection, and the suction amount of a furnace hearth is further reduced; and the voltage and the current are adjusted to control the melting rate. The double-phase stainless steel smelting technology is also suitable for other applicable fields.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and relates to a duplex stainless steel smelting process. Background technique [0002] Duplex stainless steel consists of two phases of austenite and ferrite. The ratio of the two phases can be adjusted by changing the alloy composition and heat treatment conditions. This kind of steel has high yield strength, pitting corrosion resistance, stress corrosion resistance, easy forming and welding, and is especially suitable for manufacturing equipment under the conditions of medium containing chloride and hydrogen sulfide. Due to its high strength, duplex stainless steel can be used in heavy load environments It is an ideal replacement material for austenitic stainless steel in structural applications. [0003] The development of duplex stainless steel is to solve the intergranular corrosion of high-carbon austenitic stainless steel. It mainly develops in two directions. One is to save nickel, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/068C21C7/072C22B9/18
Inventor 胡建成双伟鹏张凯亮
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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