低温热水地板辐射采暖技术

地板辐射采暖设计多采用塑料管材作为地板辐射供暖系统的加热管。塑料埋管的常见敷设形式有3种：直列型、旋转型和往复型。从目前使用情况来看，旋转型埋管方式应用最广，这主要是因为其热工性能较好。采用该布置方式时，经过板面中心点的任一剖面，埋管为高温管、低温管间隔布置，易于形成“均化”效果，板面温度均匀。     

塑料合金发展要加快

塑料合金可广泛用于汽车、电子设备、包装材料、建筑材料等领域，目前已成为塑料工业中最为活跃的领域之一，增长十分迅速。     

无铅焊料合金

以往的以Sn为主成分的无铅焊料，如果在变压器或电机的线圈部件端部进行预镀，形成于熔化焊料上的氧化屑附着在电镀部，则被废弃的氧化屑较多。为此，日本千住金属工业株式会社提供一种可抑制焊料在400℃附近氧化的无铅焊料（专利公开2004—181485）。     

Effects of Cerium on Microalloying in Low Sulfur Nb-Ti-Bearing Steel

The overcooling austenite CCT curves were investigated by using THERMECMASTOR-Z simula-tion machine, the test samples refining from 50kg vacuum induction furnace and two-stage controlled rolling in laboratorial condition. Test results show that addition cerium (Ce) in low sulfur Nb-Ti-bearing steel affects as follows: Ce can. increase the transformation point t Ar3 and t Ar1, enlarge the intervals of temperature (tAr1-tAr3).Ce can make the CCT curves to move upper and right, reduce the hardenability. Ce can increase the transformation temperature of bainite and enlarge intervals of bainite. The martensites become from coarse strip to fine strip by Ce in higher cooling rates. Ce can decrease MS and enhance the trend of lath martensitic structure and limit the formation of lamellar crystal.     

Yuchai Casting Center Becoming the Largest Production Base of Diesel Engine Castings in Asia

On July 16, 2008, the Ground-Breaking ＆ Foundation-Laying ceremony of Yuchai Casting Center was held grandly in Yuchai Industrial Park Zone A. The center is planned to occupy total land area of 1,800 Mu. After construction and putting into operation, the center will have the annual production capacity of 290,000 tons of diesel engine cylinder blocks,     

高庄煤矿压风机房高温治理

高庄煤矿－215m水平压风机房与西三采区运输巷道平行布置，由于没有独立的回风系统，压风机房相对供风不足，造成机房内温度长期偏高，影响工人正常操作和设备使用寿命。为解决这一问题，对压风机房通风系统进行了技术改造，使机房内温度降到了规程要求范围内，保证了人员正常操作和设备正常运输。