Continuous casting method of high chrome steel

A high-chromium steel and continuous casting technology, applied in the field of iron and steel metallurgy, can solve problems such as shrinkage cavities, slag pits on the surface of slabs, slag inclusions, and segregation of slabs, and achieve low production costs, stable quality, and low defective rate. Effect

Active Publication Date: 2011-10-19
PANZHIHUA IRON AND STEEL +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the quality defects such as slag pits on the surface of the slab, surface and subcutaneous cracks on the surface of the sl

Method used

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  • Continuous casting method of high chrome steel
  • Continuous casting method of high chrome steel

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Embodiment 1

[0029] Embodiment 1 uses the continuous casting method of the present invention to cast L80-3Cr high chromium steel

[0030] What this embodiment adopts is a 360mm×450mm four-machine four-strand bloom continuous casting machine, which is manufactured by CCID Company of China Metallurgical Corporation. First put the mold flux into the mold of the continuous casting machine. The composition of the mold flux is calculated by weight percentage: SiO 2 : 35%, CaO: 22%, Al 2 O 3 : 4%, MgO: 4%, Na 2 O: 11%, F - : 3%, C: 12%, Fe 2 O 3 : 1.5%, the rest are impurities. AlkalinityCaO / SiO 2 : 0.63, hemispherical point melting temperature: 1082°C, viscosity at 1300°C: 0.32Pa·s. The amount of mold slag used is 0.45kg / ton of steel. The molten steel with a superheat of 16°C after refining is injected into the crystallizer through the submerged nozzle. At this time, the temperature of the molten steel is 1526°C. 0.011%, sulfur 0.007%, chromium 2.92%, molybdenum 0.42%, all aluminum 0.0...

Embodiment 2

[0041] Embodiment 2 uses the continuous casting method of the present invention to cast L80-3Cr high chromium steel

[0042] What this embodiment adopts is 360mm * 450mm four-machine four-strand bloom continuous casting machine. First put the mold flux into the mold of the continuous casting machine. The composition of the mold flux is calculated by weight percentage: SiO 2 : 37%, CaO: 25%, Al 2 O 3 : 4.2%, MgO: 4.1%, Na 2 O: 10.5%, F - : 3.2%, C: 11.8%, Fe 2 O 3 : 1.6%, the rest are impurities. AlkalinityCaO / SiO 2 : 0.67, hemispherical point melting temperature: 1089°C, viscosity at 1300°C: 0.35Pa·s. The amount of mold slag used is 0.40kg / ton of steel. The molten steel with a superheated degree of 22°C after refining is injected into the crystallizer through the submerged nozzle. At this time, the temperature of the molten steel is 1532°C. 0.012%, sulfur 0.007%, chromium 2.98%, molybdenum 0.47%, all aluminum 0.03%, and the balance is iron and impurities. The molten...

Embodiment 3

[0046] Embodiment 3 uses the continuous casting method of the present invention to cast L80-3Cr high chromium steel

[0047] What this embodiment adopts is 360mm * 450mm four-machine four-strand bloom continuous casting machine. First put the mold flux into the mold of the continuous casting machine. The composition of the mold flux is calculated by weight percentage: SiO 2 : 36%, CaO: 25%, Al 2 O 3 : 4.8%, MgO: 3.7%, Na 2 O: 11.2%, F - : 3.4%, C: 13%, Fe 2 O 3 : 1.2%, the rest are impurities. AlkalinityCaO / SiO 2: 0.69, hemispherical point melting temperature: 1115°C, viscosity at 1300°C: 0.39Pa·s. The amount of mold slag used is 0.35kg / ton of steel. The molten steel with a superheat of 30°C after refining is injected into the crystallizer through the submerged nozzle. At this time, the temperature of the molten steel is 1540°C. 0.010%, sulfur 0.006%, chromium 3.15%, molybdenum 0.42%, all aluminum 0.02%, and the balance is iron and impurities. The molten steel in th...

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Abstract

The invention discloses a continuous casting method of high chrome steel, belonging to the technical filed of ferrous metallurgy, and solving the internal and external quality problems easily generated during continuous casting of high chrome steel in the prior art. The method comprises the following steps: a, pouring L80-3Cr high chrome molten steel with the superheat degree of 15-30 DEG C into a crystallizer of a continuous casting machine with added casting powder, cooling to obtain a continuously cast bloom, and carrying out water cooling and electromagnetic stirring during cooling; and b, pulling out the continuously cast bloom obtained in the step a from the crystallizer at a speed of 0.5-0.6m/min, cooling the continuously cast bloom in a secondary cooling area and an air cooling area in sequence, and treating the continuously cast bloom at a solidified tail end by using a dynamic light-pressing technology, wherein the total pressing amount is controlled to be 6-10mm. The methoddisclosed by the invention is mainly applied to continuous casting of L80-3Cr high chrome steel.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a continuous casting method for high-chromium steel. Background technique [0002] L80-3Cr is an anti-CO 2 、H 2 S and other acid gas corroded oil casing steel, this steel not only has high chromium content, but also has carbon content in the peritectic range, it is difficult to control the surface quality and internal quality of the continuous casting slab, and it is easy to produce slag pits on the surface of the slab, casting Surface and subcutaneous cracks, slag inclusions, slab segregation, porosity, shrinkage cavity, internal cracks and other defects. In order to control the quality of continuous casting slabs, there are many patents or articles on high chromium steel continuous casting slabs with fewer defects in China. The proprietary technologies related to the continuous casting method of high chromium 54445 steel mainly include the follow...

Claims

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Application Information

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IPC IPC(8): B22D11/22B22D11/16B22D11/111B22D11/115C22C38/22
Inventor 陈天明陈亮陈永李桂军曾建华杨文中李清春吴国荣陈小龙
Owner PANZHIHUA IRON AND STEEL
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