耐热钢-不锈钢复合钢板容器的焊接

通过对耐热钢－不锈钢复合钢板的焊接工艺试验及焊接工艺评定，确定了合理的焊接工艺及热处理工艺，并成功运用于4台复合钢板换热器的焊接制造中，取得了良好的效果，不仅保证了产品的各项力学性能及不锈钢复层的耐蚀性能达到技术指标，还为同类产品的焊接积累了宝贵的经验。     

ZG310-570铸钢与45钢异种材料的焊接

ZG310—570铸钢及45钢含碳量高。焊接性差。针对焊接易出现的的淬硬倾向、热影响区的脆化和焊接冷裂纹问题,提出了解决措施,制订出可行的焊接工艺,在焊接生产中获得了较好的结果。     

马氏体钢与奥氏体钢的焊接工艺

通过对马氏体钢和奥氏体钢各自焊接工艺特点的分析,探讨了其组合的异种钢焊接的特殊性,较详细地从焊接材料的选择、焊接工艺以及热处理方面进行了阐述。并针对电站锅炉热电偶套管(奥氏体钢)和主汽管道(马氏体钢)异种钢的焊接,提出了主要的工艺要点,认为无论选用什么样的焊接材料都必须进行预热和热处理。     

建筑钢结构用钢标准体系分析

介绍了建筑钢结构用钢的概念、发展趋势和世界主要国家的代表钢级体系，详细分析比较了日本和我国建筑钢结构用钢的标准体系，并对如何完善我国该标准体系提出了建议。     

Flash welding Hadfield steel to rail steel

The results of investigation of the special features of the formation of the structural and phase composition of R6M5 steel – TiC composite coatings in relation to the content of titanium carbide are presented. It is shown that the amount of retained austenite in the hardened layer does not exceed 5% of the total volume of the matrix already after adding 5% titanium carbide. The mean size and the volume fraction of the titanium carbide particles decreased in analysis of the structure from top to the bottom of the deposit.     

不锈钢复合钢管制造工艺

不锈钢复合钢板是一种将耐腐蚀、耐热、耐磨的不锈钢作为覆层,采用强度相对较高、塑性韧性较好的碳钢或低合金钢作为基层的高效金属材料。因此,由其制作而成的不锈钢复合钢管以其良好的力学性能、耐腐蚀性能和低廉的价格被广泛应用于建筑、机械制造、压力容器和石油化工等工业生产中。但不锈钢复合钢管的成型和焊接工艺较复杂,结合工程实际对(25 mm+3 mm)的Q245R+304L的不锈钢复合钢管的成型及焊接工艺进行探讨分析。以Q245R+304L不锈钢复合钢管的成型和焊接工艺为例,通过分析材料的特性和焊接性,并经工艺试验和焊接检验,最终确定了不锈钢复合钢管的制造工艺。     

Electroslag cladding of low alloy steel with stainless steel

Abstract

Cladding of a low alloy steel slab with stainless steel was carried out using a modified electroslag remelting technique. It is shown that the thickness of the cladding that can be achieved via electroslag remelting is dependent on the fill ratio used. The effect of power input on the joint profile obtained is reported. A combination of low fill ratio and relatively low power input is essential to minimise penetration of the base slab by the liquid metal. A satisfactory joint profile and defect free joint can be obtained via the optimisation of these process parameters. The clad product was successfully forged and rolled, which indicates satisfactory strength of the clad joint.     

扩大连铸钢品种提高钢质量

连铸技术迅猛发展，连铸比大幅度提高，企业为了扩大连铸钢品种，提高铸坯质量，增强市场竞争能力，对钢生产流程进行结构优化，列举一些重点企业近年来开发品种和结构优化的模式。     

Development of a bonding interface between steel/steel and steel/Ni by ultrasonic welding

Ultrasonic welding is a solid-state welding technique that can bond materials at a relatively low temperature and pressure. In this study, steel/steel and steel/Ni combinations were successfully bonded by ultrasonic welding, and the development of the bonding interface was examined. The bonding strength was obtained by a lap shear test and increased with welding time, as did the fraction of bonded area observed by SEM. The bonding process sequence was investigated by SEM and electron backscatter diffraction (EBSD) analysis of a cross-section at the bonding interface. It was revealed that abrasion is caused by oscillation to form small particles consisting of steel and Ni and that the particles are grown and subsequently flattened with welding time. Bonding is achieved by the flattened particles spreading along the bonding interface without any voids.     

ZG35SiMn钢与20g焊接工艺

在某还原铁项目中,冷却窑的轮带和筒体采用焊接连接,筒体材质为20g,轮带材质为ZG35SiMn。通过分析两种材料的可焊性可知,ZG35SiMn可焊性较差,20g可焊性较好。为避免焊接裂纹的产生,在两种被焊金属之间加入过渡层,首先采用A402焊条在轮带上施焊,然后用A507焊条将筒体和A402焊成一体,焊接方法采用短道焊。实践证明,采取这种工艺方法取得了良好效果。     

调整品种结构优化轧钢工艺提高国产钢材的市场竞争力--在2000年轧钢生产技术工作会议上的讲话(摘录)

总结了近年来轧钢生产技术取得的成绩 ;指出轧钢工艺、装备和产品结构调整的目标和基本思路 ;提出今明两年轧钢工作的重点。     

45钢/304不锈钢连续驱动摩擦焊接工艺

异种材料焊接结构以其在力学性能、耐腐蚀性等多方面的综合优势,而被广泛应用到装备制造中.针对电机行业中的应用需求,采用连续驱动摩擦焊接实现了45钢和304不锈钢异种钢棒材的优质高效连接,通过工艺优化试验获得了成形以及性能良好的焊接接头.结果表明,在焊接界面处有碳化物层的形成,45钢侧有很薄的铁素体层出现,304不锈钢侧奥氏体晶粒发生了细化,但热影响区内晶粒发生粗化.焊态试样抗拉强度达到870 MPa,拉伸断裂在焊缝界面,为脆性断裂,但微观上有韧窝断裂和准解理断裂两种断裂机制.     

不锈钢包覆碳钢切屑复合角钢轧制实验研究

采用不锈钢管包覆碳钢切屑作为坯料,设计一套复合角钢轧制孔型系统,利用孔型法热轧来制备复合角钢。通过轧制实验,分析了各道次的轧件形貌和碳钢切屑的致密程度及成品复合角钢碳钢切屑密度的均匀性,观察了各道次碳钢切屑内部及两金属接触面附近的金相组织。结果表明,在1150℃的轧制温度下,以不锈钢管包覆碳钢切屑作为坯料,利用孔型法逐道次轧制,可成功轧制出符合目标尺寸的角钢,并且可以实现碳钢切屑密度的致密化和均匀化,碳钢切屑之间及碳钢切屑与不锈钢之间可实现冶金结合。     

低合金钢与奥氏体不锈钢堆焊层的焊接工艺

低合金钢与不锈钢堆焊层焊接时,因稀释反应、组织变化、内应力等,降低了焊接接头质量。通过试验对异种金属焊接接头力学性能和金相组织进行分析和验证,总结工艺上所存在的问题以及长时间热处理对此类焊接接头的影响。     

热轧复合不锈钢-碳钢复合板界面特征

研究了热轧不锈钢-碳钢复合界面的组织形貌、成分、硬度变化及结构特征。结果表明热轧复合碳钢—不锈钢复合板的复合界面两侧存在一定厚度的扩散层。由于元素扩散及碳化物的生成,复合界面附近硬度升高。对于基层碳钢,靠近界面处显微硬度值最高,而对于复层不锈钢,在距界面处一定距离,显微硬度达到最高值。复合界面剥离后呈现等轴韧窝形貌,表明通过热轧复合的方法,不锈钢和碳钢之间能够实现良好的复合。