经济社会的发展离不开能源的消耗,而随着能源储备与经济发展速率矛盾的加剧,新能源开发就成为了国内科研人员的工作重点.太阳能是目前比较受欢迎的一种新能源,环保、节能、经济、适配性广是其独特的性能标签,各式各样的太阳能热水应用项目早已与国民日常生活紧密结合.本文从对太阳能热水项目的 技术应用适配性出发,对国内常见的太阳能热水系统的节能量和经济性进行分析,为我国太阳能热水应用项目的 未来发展献计献策.

分析了宝钢湛江中厚板厂产品结构;为提高产能和宽展工艺的生产效率,针对小展宽比轧制,提出一种新型中厚板柔性宽展轧制工艺—角轧宽展工艺.开发了角轧宽展工艺的计算模型和自动控制系统;为了验证角轧工艺的可行性和理论模型的设定精度,在宝钢湛江4 300 mm中厚板厂开展了角轧工艺工业生产试验研究,并对试验钢板几何尺寸和设备力能参数进行了实测和分析.生产表明,角轧宽展工艺能够提高宽展轧制的生产效率、降低宽展轧制的轧制力和扭矩,有利于延长设备寿命;角轧宽展控制系统具有较高的控制精度,宽展能力满足中厚板小宽展比的生产需求.

基于煤基直接还原过程,以半焦为原料,利用铁矿预热氧化球团还原产生的气体为活化剂,开发一步法炭化、活化制备高性能活性炭新工艺,并通过优化制备温度、制备时间及还原剂用量等工艺参数,可同时得到优质还原球团.结果 表明:在制备温度850℃、时间1h,半焦/球团的质量比为1∶1～4∶1的条件下,活性炭产率大于67％,耐磨强度达90％以上,比表面积和碘吸附值分别高于330 m2/g、500 mg/g,远优于商品活性炭,同时可得到金属化率为85％以上的预还原球团.

In this paper,the integral molding device of the pile leg of self up drilling platform is introduced .This device use a set of mold base up and down,foetus mould up and down fixed at mold base.Selection of differ-ent sizes of foetus mould up and down can be a forming of different specifications,different size of the chord pipe.At the same time introduced the chord pipe forming pressuare,punch the springback value,and the overall structure de-sign method.

The stress,temperature,deformation and compression force of the crank forging process are simulated by the software of simufact.A crank forging device formed by optimization design.Eliminating the defects of the crank in the forging process.The rationality of the mould and process design was verified through the field trial manufacture and test.

本文通过对传统弯锻工艺的数值模拟并在此基础上改进,结合特殊的热处理工艺,研制出了性能完全满足要求的船用曲拐,并有效解决了传统弯锻过程中容易出现的缺陷.

The dynamic continuous cooling transformation(CCT) curve of DH36 ship plate steel was studied by Gleeble-2000D thermal mechanical simulator.Results show that when the cooling rate was lower than 1 ℃·s-1,the microstructure of DH36 steel was ferrite and pearlite.The microstructure of DH36 steel was ferrite,bainite and little pearlite at the cooling rates of 3-13 ℃·s-1,bainite and a small amount ferrite at 15 ℃·s-1,martensite at 30 ℃·s-1.The microhardness of DH36 steel rose with the increase of cooling rate,and increased obviously when the cooling rate reached 30 ℃·s-1.

Through a series of hot simulation experiments on Gleeble machine,hot deformation behaviors and microstructure characteristics for Q345R steel were systematically studied under different deformation temperature range of 850-1200 ℃ and the strain rate range of 1-30 s-1.The results are as follows: under lower temperature and higher strain rate,stress-strain curves of Q345R steel are almost the dynamical recovery type,but under high temperature and low strain rate,stress-strain curves are dynamic recrystallization type.Further microstructure analysis shows that the hot forming temperature to microstructure of Q345R steel has important influence.When Q345R forming at the temperature below 950℃ then cooling in air,ferrite and pearlite are banded distribution due to the heredity of microsegregation and not enough diffusion;when Q345R forming at the temperature above 1000℃ then cooling in air,the uniform distribution of ferrite and pearlite can be obtained.

The effects of heating temperature and holding time on the austenite grain growth in low carbon micro-alloyed steel were investigated.The results show that the austenite grain size increases linearly,approximately,with heating temperature increasing from 950 ℃ to 1150 ℃.The accelerated tendency of grain growth occurs significantly while heating temperature is higher than 1150 ℃.Austenite grain heating from 950 ℃ to 1200 ℃ is in the size of 17 to 51 μm,and does not appear abnormal growth,which indicates that the heating temperature of 1200 ℃ is feasible.

Trial production of high strength hull structural steel DH36 with 30mm in thickness of a specific steel enterprise medium and heavy plate is discussed.According to requirements of alloy ingredient design and mechanical properties of high strength hull structural steel DH36,effects of slab quality of continuous casting,delivery system of steel and controlled rolling technology,etc on microstructure,mechanical properties and tensile fracture of hull structural steel DH36 were investigated.The difference of mechanical properties and the problems of tensile fracture of hull structural steel DH36 which are produced in different process technologies were analyzed,and the corresponding improvement programs were proposed.And finally,an optimization of alloy design and appropriate controlled rolling technology is established.The results of research indicate that properties of product with above production technology are satisfied with the demand of high strength hull structural steel DH36 in China Classification Society(CCS).