A kind of mold slag for continuous casting mold for p91 steam pipeline steel and its preparation method

A continuous casting crystallizer and steam pipeline technology, applied in the field of metallurgical materials, can solve the problems of poor fluidity of slag, low binary alkalinity, uneven inflow, etc., and achieve the reduction of shell scratches, full crystallization, Effect of preventing sticky slag

Active Publication Date: 2018-11-13
HENAN XIBAO METALLURGICAL MATERIALS GROUP
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Problems solved by technology

However, the patent mold slag has a low binary alkalinity and cannot achieve the purpose of slow cooling of the slab during casting. Because the slab is cooled too quickly during casting and the shrinkage of the slab shell is too large, longitudinal cracks are easily generated, and the viscosity value is high. It also leads to poor fluidity of slag and uneven inflow

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  • A kind of mold slag for continuous casting mold for p91 steam pipeline steel and its preparation method
  • A kind of mold slag for continuous casting mold for p91 steam pipeline steel and its preparation method
  • A kind of mold slag for continuous casting mold for p91 steam pipeline steel and its preparation method

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with some specific embodiments.

[0035] The chemical composition and weight percentage of P91 mold flux for continuous casting in Examples 1 to 8 of the present invention are shown in Table 1, the weight percentage of each raw material is shown in Table 2, and the chemical composition and weight percentage of the premelt used The contents are shown in Table 3.

[0036] The preparation method of mold flux for P91 continuous casting mold in Example 1 of the present invention comprises the following steps: crush each raw material to 200-mesh fine powder, add it to a mold flux ball mill, and then add clear water to make the pulping concentration 60%, and grind The slurry time is 60 minutes, and it enters the hot air spray tower through the pressure pump for 600 ℃ spray granulation to obtain hollow granular mold powder with a particle size range of 0.15-1.0mm and a moisture content of ≤0.30%.

[0037] The...

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Abstract

The invention belongs to the technical field of metallurgy materials, and particularly relates to continuous casting crystallizer casting powder for P91 steam pipeline steel and a preparation method of the continuous casting crystallizer casting powder. The casting powder is prepared from, by weight percent, 26.0%-35.0% of SiO2, 27.0%-37.0% of CaO, 0.4%-1.2% of Li2O, not larger than 6.0% of Al2O3, 7%-13% of Na2O, 4%-8% of F-, not larger than 4.0% of MgO, not larger than 1.0% of Fe2O3, 5%-9% of Csolid and 8%-12% of volatile components. The casting powder can achieve crystallizer lubricating during low-temperature casting, a slag film has sufficient crystallization to improve crystallizer heat transfer, P91 steel large round blank surface longitudinal cracks are reduced, and the casting blank quality is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, and in particular relates to a continuous casting crystallizer mold powder for P91 steam pipeline steel and a preparation method thereof. Background technique [0002] In the past, the pipes in the hot section of the steam pipeline were all made of P22 pipes, which belonged to pearlitic heat-resistant steel, and the maximum working temperature was 580-590 ℃. The biggest disadvantage is that the high-temperature durable strength is low, and the wall thickness of the steam pipe is too large, which not only increases the difficulty of manufacture, but also brings inconvenience to design, installation and operation. P91 steel is based on the original 9Cr-1Mo steel by adding V, Nb, N and other strengthening elements to improve the strength of the steel. Adding Cr, Si and other elements can make the oxide film formed by the metal at high temperature operation dense and firm, and improve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 李伟锋李书成李保军方卉宋志刚
Owner HENAN XIBAO METALLURGICAL MATERIALS GROUP
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