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Smelting process of Cr-Mo steel ingot being low in sulfur, phosphorus and silicon

A smelting method and technology for steel ingots, which are applied in the field of smelting low-sulfur, low-phosphorus and low-silicon Cr-Mo steel ingots, can solve the problems of difficulty in slag floating, inconsistent steel plate flaw detection, etc., and achieve the effects of low cost, strong versatility and simple operation.

Active Publication Date: 2018-03-02
WUYANG IRON & STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Si in steel can improve the fluidity of molten steel, but Si is a brittle sensitive element, and a low Si content in steel will increase the difficulty of casting ingots, making it difficult for slag in molten steel to float up, resulting in flaw detection of steel plates after steel ingots are rolled into products disagree

Method used

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  • Smelting process of Cr-Mo steel ingot being low in sulfur, phosphorus and silicon

Examples

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Effect test

Embodiment 1

[0019] One furnace of 12Cr2Mo1VR was smelted, 117 tons in a single furnace, 53 tons in a single steel ingot, and the thickness of the finished rolled steel plate was 137mm, and the length was 13500mm. The chemical composition and mass percentage of steel ingot are: C: 0.14%, Si: 0.06%, Mn: 0.57%, Cr: 2.34%, Mo: 1.02%, V: 0.304%, Ni: 0.14%, Ca: 0.001 %, P: 0.005%, S: 0.003%, As: 0.004%, Sn: 0.001%, Sb: 0.001%, and the balance is Fe and unavoidable impurities.

[0020] The low-sulfur, low-phosphorus, low-silicon, low-silicon Cr-Mo steel ingot smelting method in this embodiment includes electric furnace steelmaking process control, refining furnace refining process control, VOD process control and casting process control procedures. The specific process steps are as follows:

[0021] (1) Control process of electric furnace steelmaking process: in the process of electric furnace steelmaking, 38kg / t steel active quicklime and 23kg / t steel fluorite are added, and when electric furna...

Embodiment 2

[0028] One furnace of 12Cr2Mo1R was smelted, with a single furnace of 105 tons, a single steel ingot of 47 tons, and a finished rolled steel plate with a thickness of 134mm and a length of 12800mm. The chemical composition and mass percentage of steel ingot are: C: 0.12%, Si: 0.07%, Mn: 0.54%, Cr: 2.41%, Mo: 1.03%, V: 0.02%, Ni: 0.17%, Ca: 0.001 %, P: 0.004%, S: 0.002%, As: 0.003%, Sn: 0.001%, Sb: 0.001%, and the balance is Fe and unavoidable impurities.

[0029] (1) Control process of electric furnace steelmaking process: During the electric furnace steelmaking process, 43kg / t steel active quicklime and 23kg / t steel fluorite are added, and when electric furnace steel is tapped, S: 0.029%, P: 0.008%;

[0030] (2) Refining furnace refining process control process: during the refining furnace refining process, add active quicklime 5kg / t steel, fluorite 3kg / t steel, smelt for 35min; add Al wire 2.2kg / t steel at one time before adding alloy; add alloy After that, 500kg of metal C...

Embodiment 3

[0035] One furnace of 2.25Cr1Mo0.25V was smelted, with a single furnace of 112 tons, a single steel ingot of 52 tons, and a finished rolled steel plate with a thickness of 142mm and a length of 11870mm. The chemical composition and mass percentage of steel ingot are: C: 0.13%, Si: 0.10%, Mn: 0.53%, Cr: 2.39%, Mo: 1.01%, V: 0.31%, Ni: 0.18%, Ca: 0.001 %, P: 0.007%, S: 0.005%, As: 0.002%, Sn: 0.001%, Sb: 0.001%, and the balance is Fe and unavoidable impurities.

[0036] (1) Control process of electric furnace steelmaking process: in the process of electric furnace steelmaking, add 40kg / t steel active quicklime and 26kg / t steel fluorite, and when electric furnace is tapping, S: 0.03%, P: 0.009%;

[0037] (2) Refining furnace refining process control process: during the refining furnace refining process, add active quicklime 4kg / t steel, fluorite 2.6kg / t steel, smelt for 20min; add Al wire 2.1kg / t steel at one time before adding alloy; add Add 500kg of metal Cr after the alloy, a...

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Abstract

The invention discloses a smelting process of a Cr-Mo steel ingot being low in sulfur, phosphorus and silicon. The smelting process includes the steps of: electric furnace steelmaking process control,refining process control in a refining furnace, VOD process control and casting process control, wherein in the casting process control step, casting is carried out via a bottom casting method. The steel ingot of the Cr-Mo steel is not more than 0.005% in sulfur content, not more than 0.007% in phosphorus content, and not more than 0.1% in silicon content. A largest produced steel ingot can reach53 tons in weight. After the steel ingot is processed, NB / T47013.3 first-class flaw detection qualification rate of the steel board is not less than 96%; the steel board is free of obvious layering defect and is free of large granular foreign matters. The smelting process is simple and low-cost, employs regular steelmaking equipment, has simple operations and good university and can save energy.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a low-sulfur, low-phosphorus, low-silicon Cr-Mo steel ingot smelting method. Background technique [0002] Cr-Mo steel has excellent corrosion resistance and high temperature performance, and is often used in the manufacture of boilers and pressure vessels. If the single weight of the steel plate is large, the continuous casting slab cannot meet the production requirements, and steel ingots can only be used to form materials. For Cr-Mo steel, S and P in the steel are harmful elements. S in the steel will cause hot embrittlement of the steel, reduce the ductility and toughness of the steel, and easily generate cracks during rolling. P in steel is a brittle sensitive element, which increases the cold and brittleness of steel, deteriorates the welding performance of steel, reduces plasticity, and reduces cold bending performance. Therefore, in the smelting process, ...

Claims

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Application Information

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IPC IPC(8): C21C5/52C21C7/10C21C7/068B22D7/00
CPCB22D7/00C21C5/52C21C7/068C21C7/10Y02P10/20
Inventor 邓建军李杰龙杰侯敬超袁锦程吴艳阳牛红星尹卫江李样兵王东阳
Owner WUYANG IRON & STEEL
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