Casting defects in the semi-steel roll

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 Semi-steel roll wide range of uses, but there will be some flaws: face crack, a large area of ??the slag, riser shrinkage in the casting production process, the finished product rate is low, you need to analyze and to control.

1, the crack

Semi-steel roller rough on the crack of the roll surface and the end is the cause of improper C, Si content with cold paint process is unreasonable, the chemical composition of the roll material, but off the molding process is unreasonable, casting process.

2, a large area of ??the slag

Semi-steel work surface roll processing the visible area of ??the slag. Low coating strength, thickness control is not strict, the cavity and the casting of debris in the system, the molten steel slag material cause.

3, the riser shrinkage

After the completion of the molten steel casting, the cooling time and cooling rate resulting in more formation of shrinkage defects in the riser.

Control measures are: investment c asting china

1, the crack

1) blast furnace C content control in the process lower limit of Si content control in the limit.

2) coating thickness to ensure that in the 0.5-1.0mm, spray evenly.

3) shape, roll neck to take the next mud of the core technology is conducive to the contraction of molten steel, to reduce shrinkage cracks, and under the roller shape R Ministry fillet trimming, should be less than cold-diameter 50-150mm, depth control in the 150-200mm.

4), casting the molten steel to maintain a large flow of the casting process, shorten the casting time to ensure that the casting speed.

2, a large area of ??the slag valve castings

1) the melting process the furnace waste products, slag clean.

2) a steel ladle should be clean to ensure that the scum floating; leakage of bottom package casting ladle bottom bl owing Ar, the purification of molten steel.

3) hanging sand process to increase the binder bentonite should be appropriate to avoid too little, casting caused by sand washing slag.
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4) modeling is completed, the sand box paint brushing uniform clean to ensure that no floating sand. Hop Box, the cavity of the debris also clean.

3, the riser shrinkage

1) Heating risers, in order to facilitate feeding.
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2) in the riser just before solidification, according to the number of steel water riser Dianbu most appropriate.
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3) Dianbu riser, and then tamping riser 10-20min, and then use the feeding insulation agent covering the riser from the insulatio n.

4) to prevent the next roll neck loose produce, the key is to reduce the roll neck allowance; cold iron can also be placed at the roll neck and neck at the molten steel under rapid solidification to prevent the molten steel feeding.