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Liu Y.,MCC Capital Engineering and Research Incorporation Ltd | Liu Y.,Beijing Casting Rolling Engineering Research Center | Cao J.-N.,MCC Capital Engineering and Research Incorporation Ltd | Cao J.-N.,Beijing Casting Rolling Engineering Research Center | And 6 more authors.
Kang T'ieh/Iron and Steel | Year: 2014

Large ingots are mainly used for production of supper thickness plates. With the increasing of ingot mass, the porosity is so deep on the upper of ingot that the metal yield is reduced, and the organization density is relatively poor and segregation is serious. So the large-rectangular ingot quality becomes the bottleneck to play heavy plate mill capacity. Aim at the problem, the equipment for casting large ingot with intensive water cooling was used to produce a kind of large rectangular ingot with 60 t successfully. The ingot was rolled into 220 mm thick steel plate. Although the composition is in the range of Q345B, the performance indexes met the stand of super thickness Q345E-Z35 plate, and the yield strength was 348 to 373 MPa, the tensile strength was 562 MPa to 588 MPa, percentage elongation was 17% to 28.5%, the transverse impact energy was 56.57 to 71.65 J and the longitudinal impact energy was 40.76 to 88.80 J at -40 ℃, the average percentage reduction in area was 63.04% at 1/2 thickness and 57.93% at 1/4 thickness. The total inclusions grade was not exceed 2.0, the grain fineness was 8 to 9. The result shows that the technology for production large rectangular ingot with intensive water cooling can provide the stocks for super thickness plates.

Ma T.,CERI Yingkou Equipment Technology Co. | Wang Y.,CERI Yingkou Equipment Technology Co. | Liu Z.,China National Petroleum Corporation | Ma Q.,China National Petroleum Corporation | Liu W.,CERI Yingkou Equipment Technology Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2012

Magnesium alloy exhibits poor plastic performance, therefore, the plastic forming of magnesium alloys becomes a new technical challenge. Continuous rheo-extrusion forming realizes magnesium alloy from high-temperature liquid directly into finished products, reducing procedures and saving energy. However, there often appears cracks on the upper and lower surfaces of the products. Origination of crack formation was analyzed. The different liquid metal velocity is responsible for the crack formation in the alloy products. Through using lubricant agent, controlling extruding rate and enlarging fixed-radial length of the mould, the crack is eliminated.

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