In fact, competitors in China are moving ahead. Sande Stahlguss GmbH has delivered approximately 500 tons of steel castings in CB2 steel mainly for Chinese power plants since 2011. The scope of products ranges from valves to inner
casings for highly critical steam conditions at high to ultra high pressure. Due to the extreme loads the valves are exposed to the wall thicknesses of the delivered castings reach 300 mm. The net weight per part ranges from 1.5 to 25 tons. Construction welds (similar or dissimilar) are another scope of supply of CB2 castings from SSG. The narrow margins for the analysis given by our
customers have to be considered and are challenging. The maximum gas contents which have to be met require the use of an AOD (Argon-Oxygen-Decarbu- rization) refining unit. Te investment in the AOD refining, which was done
mainly for stainless steel, cold work steel, conventional high temperature steels, and duplex steels, proved to be the right decision. For stainless steel and cold work steels with a low
carbon content a sufficient decarburization is compulsory. Te higher degree of purity affects the mechanical proper- ties positively. Te secondary production (repair welding) benefits from the significantly lower amount of defects. Te extensive experience made with conventional high temperature and high alloyed steel grades is helping SSG now, especially for the quality heat treatment of CB2 steel. Due to the lessons, learned a decisive quality heat treat- ment for CB2 steel was developed, in order to meet the high customer requirements safely. From a manufacturing perspective, the CB2 steel is
even more difficult to handle than conventional high tem- perature steel grades. SSG has gathered experience in the casting technology as well as welding technology for CB2 steel since 2011. Te experience that is now available at SSG encompasses fabrication welding as well as construc- tion welding. For further improvements SSG is testing recently developed CB2 steel grade wire for gas metal arc welding (GMAW) in the production environment. Due to the experience of more than 500 tons of CB2
steel castings made throughout the whole production pro- cess the lead times could be reduced significantly. Besides the extraordinary high quality standard, the
short lead time is another reason why customers placed further orders of approximately 400 tons delivery weight in CB2 steel at Sande Stahlguss GmbH. Te use of high alloyed CB2 steel in modern power
plant technology allows higher operating temperatures compared to conventional steel grades. By using those steel grades the efficiency of the existing plants can be enhanced and the carbon dioxide emissions can be reduced signifi- cantly. Sande Stahlguss GmbH is actively working on the research for new steel grades and is a reliable partner in the development of new materials. By doing this, Sande Stahlguss GmbH contributes its share to the reduction of carbon dioxide emissions. ■
争对手已经走在了前面。2011年，Sande铸钢公司已 向中国发电厂提供了大约500吨的CB2合金钢铸钢件。 产品范围包括蒸汽参数要求严格以及超高压的阀 门、内部铸件。由于超负荷，所销售铸件的阀门壁厚 要求达到300 mm。每个铸件的净重为1.5到25吨不 等。施工焊接件（相似或不同）是Sande铸钢公司的 CB2合金钢铸件的另一个产品范围。
客户提供的微弱的利润分析报告，应该引起重视， 而且这是一个充满挑战的问题。要满足最大的气体容 量，要求使用氩氧脱碳的炼油装置。 氩氧脱碳炼油装置的安装主要针对不锈钢、冷作 钢、传统高温钢和双相钢的生产，事实证明这是一个 明智的选择。
对于低碳不锈钢和冷作钢，充分的脱碳处理是必须 的。高纯度对机械性能产生积极影响。二次生产（补 焊）也受益于很低的不合格率。对于传统高温和高级 别合金钢进行的广泛试验，有助于Sande铸钢公司对 CB2合金钢的热处理工艺的提升。通过试验，研究出 了具有决定性意义的CB2合金钢热处理方法，可以完 全满足客户的高要求。 从生产的角度看，CB2合金钢比传统高温合金钢的 处理难度更大。从2011年开始，Sande铸钢公司已经 获得了CB2合金钢铸造技术和焊接技术的很多经验， 其中包括生产焊接和施工焊接技术。未来进一步提高 技术水平，Sande铸钢公司目前正在对新研发的用于 气体保护金属极弧焊线材的CB2合金钢进行生产阶段 的测试。
由于已完成了500吨CB2合金钢铸件的生产，整个 定货时间已被大大缩短。
除了具有超高的质量标准外，较短交货期是客户选
择CB2合金钢铸件的另一个原因。目前，Sande铸钢 公司已有约400吨的订单。 CB2合金钢在现代电厂的使用，与传统合金钢相 比，可以满足较高的作业温度要求。使用这种高标 准的合金钢，可以提高现有电厂的能效，并显著减少 CO2的排放。Sande铸钢公司是新材料研发领域可靠 的合作伙伴，目前正在积极进行新的合金钢的研发。 通过这些措施，Sande铸钢公司为CO2的减排贡献了 自己的一份力量。 ■
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FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION December 2014
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