The steel E911 (9 percent Cr, 1 percent Mo, 1percent W + Nb + V + N) developed through an experimentalprogramme supported by ECSC funding is now an industriallyestablished steel. Tubes and pipes made from continuously castbillets have been manufactured. Long-term testing, which is stillcontinuing, demonstrates that E911 has a significant strengthadvantage over Steel 91, derived from the optimised)precipitation strengthening of VN and additional solid solutionstrengthening by tungsten. Metallographic data demonstrate thestability of the microstructure and therefore the long term strength of E911.The commercial products made from this steel have beensubjected to various tests to assess its suitability forapplication in high temperature, high pressure boiler systems.The paper reports on the success in developing weldingconsumables. The creep rupture properties of the completeweldment have been assessed to determine boilercomponent service and fabrication parameters. The effect ofcold work on creep properties and the material behaviourwith respect to stress corrosion cracking resistance have alsobeen determined. Stress corrosion data for E911 in as-welded and post weld heat treated conditions demonstratethat it can be fabricated easily and used safely.Preliminary results from a parallel programme involving thefabrication of a trial header by conventional methods and byHIPping are encouraging.
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机译：通过ECSC资金支持的实验性普及，钢E911（9％CR，1％的MO，1％MO，1％的W + NB + V + N）现在是一种工业化的钢。制造了由连续铸造的管道和管道。静止的长期测试表明，E911对钢91具有显着的钢筋91，源自优化的）沉淀强化VN和另外的固体溶液加强钨。金相数据表明了微观结构的趋势，因此是E911的长期强度。由该钢制成的商业产品已经培养到各种试验中，以评估其在高温，高压锅炉系统中的适用性。论文的发展焊接卡扣。已评估完成的蠕变破裂特性以确定锅炉组分服务和制造参数。 Cold工作对蠕变性能的影响和致力于应力腐蚀裂解抗性的材料具有Alsobeen。焊接和焊接后热处理条件的E911的应力腐蚀数据规范，它可以容易地制造，并安全地使用。通过常规方法涉及涉及试验标题的并行计划的起义结果是令人鼓舞的。
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