The experiment methods for industrial burner were discussed, a development example of a long flame burner for a heavy steel factory was also included and the importance of the experiment plat-form for burner combustion efficiency improvement was stated.

以一种低碳微合金钢为对象,通过中薄板坯连铸连轧线进行了600 MPa级汽车用热轧高扩孔钢的工业研制与开发.试制结果表明:成品钢板的组织由铁素体和贝氏体组成,铁素体的体积分数约为71.5％,铁素体晶粒尺寸约为5.6 μm,钢板的抗拉强度高于610MPa,伸长率大于22.0％,扩孔率大于104％,钢板性能满足国家标准要求.同时,对热轧参数和合金元素对产品的组织和性能的影响进行了讨论.

为了研究Si和Nb对高强热轧高扩孔钢板显微组织、力学性能和扩孔性能的影响,在CSP连轧线上进行了3种成分试验钢的热轧试制,并对试验钢在扩孔过程中裂纹的形成和扩展行为进行了分析.研究表明:3种成分热轧钢板的显微组织均由铁素体和贝氏体组成,钢板的抗拉强度均高于610MPa,伸长率大于24.5％,扩孔率高于104％;Si含量的增加,提高了组织中铁素体的含量,钢板的强度、伸长率和扩孔率得到提高;Nb含量的增加,细化了钢板的组织,钢板的强度和扩孔率增加明显,伸长率变化不大;试验钢在扩孔过程中裂纹主要沿铁素体和贝氏体的晶界处扩展,部分裂纹穿过铁素体晶粒.

With regard to the degradation of the corrosion resistance of a colour coated steel sheet due to the paint film peeling after it is profiled,the investigations on the reasons of degradation are analyzed.And thus the steel sheet with the defect of paint film peeling is inspected by scanning electron microscope,energy dispersion spectrometry and salt spray corrosion test.The inspected results show that the reason why the corrosion resistance of the colour coated steel sheet is degraded due to its defect of paint peeling is that the sheet is short of passivating pretreatment.However the thickness drop of the coating layer of the colour coated steel sheet is also one of the reasons.

Dynamic CCT curves and microstructure evolution of 42CrMo steel were detected by dilatometry and metallography and hardness test.The results show that at low cooling rate,the microstructure of 42CrMo steel mainly consists of ferrite,pearlite and bainite.With increasing of cooling rate(in the range of 0.2-1 ℃/s),the ferrite and pearlite reduce gradually until the microstructure mainly composed of bainite at the cooling rate of 1 ℃/s.As the cooling rate ≥3 ℃/s,martensite starts to form and until the martensite completely formed at the cooling rate ≥10 ℃/s.The high cooling rate and deformation is proposed to be responsible for the formation of martensite.

本研究的目的是通过分析颗粒涂料彩板的表面状态与表面微观形貌表征参数RPc值和Ra值之间的关系,建立颗粒涂料彩板的表面状态的量化指标,实验结果表明:表面粗糙度的RPc值和Ra值与颗粒涂料彩板的表面状态有着必然的联系,可以用做表面质量的约束指标;玻璃微珠的添加量和面漆膜厚对颗粒涂料彩板的机械性能和表面状态有着显著的影响,可作为工艺参数制定时的参考。

During the regenerative reconstruction of the heating furnace,the phenomena of the high hearth pressure and severe furnace door fire were found.The influences of the original pressure control system and flux control system on the hearth pressure were analyzed.The existed problems on the auto-matic system were found and the improved measures were put forward.

To solve the contradiction of present controlling parameters of reheating furnace and more and more fine heating requirements,by analyzing reheating constitution and process parameters of furnace,problems of present reheating constitution were pointed out.With online thermal measurement and analyzing of billet,reheating temperature and reheating time,heat load and temperature field in different stage were optimized.New reheating constitution was proposed.Energy saving and reduction of oxygenized material were realized.

Temperature drop of molten iron in the shipping process was studied,testing of temperature drop of different traffic mode between blast furnace-convertor was carried on.Through the analysis of test result,the influencing factors for temperature of molten iron are found out,and the relation between different influencing factors was analyzed.

The concepts of temperature and thermal values are put forward and analyzed about molten iron in this paper,and the scientific method are also done on assessing quality and temperature value.It is pointed out that technique input and support of management and support are necessary in order to decrease molten iron energy consumption.

A new kind of material with good heat-resistant, high-strength and heat-insulating properties was prepared by combustion synthesis with the mixing powder of CrO3, Al , Al2O3 and NaF in air atmosphere. The influence of the quantity of NaF on combustion synthesis process, phase composition and microstructure, and mechanical and thermal properties of the combustion synthesized products were studied. Reaction mechanism of combustion synthesis has been discussed. The results show that the materials have the following properties: refractoriness is higher than 1800 ℃,cold crushing strength is 19 MPa,thermal conductivity at 600℃ is 0.76W/(m·K). The materials can be used in many aspects such as heat-resistant,heat-insulating and abrasion and so on.

Temperature of various section and layer surface heating furnace was measured by temperature testing technology real time in the progress of heating billet.Technology analysis is done in aspects of temperature distributing of furnace air,billet in length and in section,time in furnace.Energy consuming and oxygenation loss have been reduced after heating system was optimized.

The mathematical model in heating furnace is set up for calculating billet tapping temperature according to billet heterogeneity,specification and opening rolling temperature.The tapping temperature curve obtained by the mathematical model accords well with the tapping temperature curve obtained by black casket test,so various billet tapping temperature can be forecasted by the mathematical model.

It is studied that different heating temperature and atmosphere have an effect on oxygenation loss of billet at laboratory therefore,the temperature zone and status of heating atmosphere are found for intensifying oxygenation loss of billet,and these provide references for production site to decrease the rate of oxygenation loss.

在实验室采用电炉对高碳钢加热过程进行模拟试验,分析加热温度、加热时间、炉内气氛等因素对其脱碳特性的影响,为加热炉加热工艺提供依据.