Killed steel ingot head for steel ingot insulation equipment. Its role is to make the mouth of the cap portion of a long molten steel holding time of the liquid, so that the body of the ingot to ingot solidification of the molten steel in the process of volume shrinkage as the continuously added so that the final shrinkage is located above the mouth of the cap to ensure the dense body of the ingot does not appear shrinkage and osteoporosis, to reduce ingot defects and blooming crop loss purposes. Insulation cap usually made ​​of cast iron shell and refractory AISI 4330 lining composition. 
Cap placed by way of insulation types can be divided into fixed and floating type categories (see figure). The former applies to rolling ingots, insulation cap placed on top of a smooth ingot mold catchy; latter applies to forging ingots, you can adjust the height of the insulation cap trunnion pillar below, casting ingots of different weights, to a multi-mode. Meanwhile, remove the pillar after completion of injection, with ingots AISI 8620 condensing heat shrink caps can free fall, does not result in the suspension ingot produced by transverse cracks. Lined with refractory nature by points, there are clay brick, lightweight clay brick, cinder blocks and other insulating board. Insulation board for the development and application of the 1970s, a new cap mouth insulation material, because of its small heat capacity and thermal conductivity λ is very low (1000 ℃ when λ≤0.45W / (m • K)) so that cap the total volume of the ingot volume ratio (ie cap capacity ratio) by 16% to 20% of the traditional clay brick insulation cap is reduced to 10% to 14%. Spend little time great exposure killed steel ingot mold casting, the insulation panels hang nail or inlay puzzle in ingot mold catchy certain height on the inner wall; large when using traditional small-killed steel ingot mold casting, insulation boards directly inlay puzzle in the insulation cap steel, and some direct inlay puzzle in the inner wall of the ingot mold catchy. At this height was significantly lower due to cap the mouth, with a gap ingot mold to be designed to ensure that the crane's AISI 4330V jaws can grip release ingot head, smooth release. 
Structural parameters in order to ensure the effective thermal insulation cap feeding effect, insulation cap must have a reasonable structure parameters: hat capacity ratio, cross-sectional shape, shoulder width, taper and corner radius. 
(1) cap capacity ratio. Insulation cap cavity volume and the ratio of the total volume of the ingot. Insulation cap volume to ensure adequate capacity to supplement not pour molten steel 18NiCrMo6-4 ingot solidification shrinkage body. Thermal insulation properties of the better lined cap, cap capacity ratio can be smaller. Generally, clay brick lining insulation cap cap capacity ratio of 16% to 20%, with a cinder brick lining at 12% to 16%; lined with insulation board when 10% to 14%. And the high quality requirements of small ingots or shrinkage of steel to take maximum, otherwise take the lower limit. 
(2) cross-sectional shape and shoulder. Cavity insulation cap usually positive truncated cone shape. Under the ingot mold catchy side with poor insulation cap side of the mouth, said insulation cap Shoulder. General Shoulder of 20 ~ 50mm, large ingots take limit. 
(3) taper. To reduce heat loss molten steel surface, reducing metal consumption and ease of hat, holding hat taper generally take 10% to 15%. 
(4) corner radius. Increase the insulation cap corner radius, helps to reduce heat loss and increase feeding effect. Corner upper insulation cap is large, the lower small gradual transition to the mouth of the ingot mold shape. 
Use and maintenance clay brick lining insulation cap can be used multiple 36NiCrMo16 times, when placed on a smooth, the surface to be painted after each refractory clay and heated baking and drying. Insulation panels lining single use only, usually after casting car nematic hang nail or inlay puzzle insulation board. Insulation board should be dry, shape the rules should be complete.
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