A method for smelting low-sulfur, low-phosphorus, low-silicon cr-mo steel ingots

A smelting method and steel ingot technology, which is applied in the field of smelting low-sulfur, low-phosphorus, low-silicon Cr-Mo steel ingots, can solve problems such as difficult slag floating up, flaw detection of steel plates, etc., and achieve the effects of low cost, strong versatility, and simple operation

Active Publication Date: 2019-07-12
WUYANG IRON & STEEL
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  • Summary
  • 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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  • A method for smelting low-sulfur, low-phosphorus, low-silicon cr-mo steel ingots
  • A method for smelting low-sulfur, low-phosphorus, low-silicon cr-mo steel ingots

Examples

Experimental program
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Effect test

Embodiment 1

[0019] One furnace of 12Cr2Mo1VR is smelted, with a single furnace of 117 tons and a single steel ingot of 53 tons. The finished rolled steel plate has a thickness of 137mm and a length of 13,500mm. The chemical composition of the steel ingot and its mass percentage content 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%, the balance is Fe and unavoidable impurities.

[0020] The low-sulfur, low-phosphorus and low-silicon Cr-Mo steel ingot smelting method of 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) Electric furnace steelmaking process control procedure: In the electric furnace steelmaking process, add 38kg / t steel active quicklime, 23kg / t steel fluorite, when the electric furnace tapping, S: 0....

Embodiment 2

[0028] Smelting one furnace of 12Cr2Mo1R, a single furnace of 105 tons, a single ingot of 47 tons, the thickness of the finished rolled steel plate is 134mm, and the length is 12800mm. The chemical composition of the steel ingot and its mass percentage content 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%, the balance is Fe and unavoidable impurities.

[0029] (1) Electric furnace steelmaking process control procedure: In the electric furnace steelmaking process, add 43kg / t steel active quicklime, 23kg / t steel fluorite, when the electric furnace tapping, S: 0.029%, P: 0.008%;

[0030] (2) Refining process control procedure of the refining furnace: During the refining process of the refining furnace, add active quicklime 5kg / t steel, 3kg / t steel fluorite, smelting 35min; before adding alloy, add 2.2kg / t steel of Al wire at one time; add alloy Then add 500kg of metal Cr, after the...

Embodiment 3

[0035] Smelting a furnace of 2.25Cr1Mo0.25V, a single furnace of 112 tons, a single steel ingot 52 tons, the thickness of the finished rolled steel plate is 142mm, and the length is 11870mm. The chemical composition of the steel ingot and its mass percentage content 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%, the balance is Fe and unavoidable impurities.

[0036] (1) Electric furnace steelmaking process control procedure: In the electric furnace steelmaking process, 40kg / t steel active quicklime and 26kg / t steel fluorite are added during electric furnace steelmaking, S: 0.03%, P: 0.009%;

[0037] (2) Refining furnace refining process control procedure: In the refining process of the refining furnace, add active quicklime 4kg / t steel and 2.6kg / t steel fluorite for 20 minutes; add 2.1kg / t steel of Al wire at one time before adding alloy; After alloying, add 500kg of metallic Cr...

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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 specifically relates to a low-sulfur, low-phosphorus and 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 unit weight of the steel plate is relatively large, the continuous casting billet generally cannot meet the production requirements and can only be made of steel ingots. For Cr-Mo steel, both S and P in the steel are harmful elements. The S in the steel will cause the steel to produce hot brittleness, reduce the ductility and toughness of the steel, and easily produce cracks during rolling. P in steel is a brittle sensitive element, which increases the cold brittleness of steel, deteriorates the welding performance of steel, reduces plasticity, and reduces cold bending performance. Therefore, the S and P c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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