Development of a 9Cr-0.5Mo-1.8W Steel for Boiler Tubes
Development of a 9Cr-0.5Mo-1.8W Steel for Boiler Tubes
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9Cr-0.5Mo-1.8W锅炉管钢的研制
DOI：
10.2355/tetsutohagane1955.76.7_1124
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
T. Fujita
中科院分区：
文献类型：
--
作者：
M. Ohgami;Araki Satoshi;H. Naoi;T. Ogawa;H. Yasuda;H. Masumoto;T. Fujita
简介：目前，超临界和先进电厂的过热器和再热器管材料要求采用高强度铁素体钢，而不是奥氏体不锈钢。在发现用W代替9 ·12%Cr-Mo钢中的部分Mo对提高持久强度非常有效的基础上，研制了一种9 Cr-0. 5 Mo 1. 8 W-Nb-V锅炉管钢，其600 ℃下105 h持久强度达到157 MPa。该钢还具有优良的焊接性和缺口韧性，其600 ℃许用拉应力为85 MPa，明显高于9 Cr-Mo钢和18 Cr-8 Ni奥氏体钢。TIG焊接接头的蠕变断裂强度与母管相当。经日本通产省批准，某发电厂的几根三级过热器管由SUS 321 HTB材质的锅炉管替代。锅炉在管温600 ℃、设计应力85 MPa下连续运行13000 h以上，无故障。研究结果表明，9 Cr 0.5Mo-1.8WNb-V钢可替代18-8系列奥氏体钢，适用于集箱、管道和管子。
Synopsis : At present, high strength ferritic steel is required as material for the superheater and reheater tubes of super critical and advanced power plant, instead of austenitic stainless steels. Based on the finding that the replacement of a part of Mo of 9 •` 12%Cr-Mo steels by W is very effective for increase in creep rupture strength, a 9Cr -0.5Mo1.8W -Nb -V steel whose 105 h creep rupture strength at 600•Ž reached 157 MPa was developed for boiler tube. This steel also possesses excellent weldability and notch toughness, and its allowable tensile stress at 600•Ž is 85 MPa, which is significantly greater than that of 9Cr-Mo steels and 18Cr-8Ni austenitic steels. The creep rupture strength of TIG weld joint is nearly the same as that of the mother tube. With MITI's approval, several tertiary superheater tubes of SUS321HTB of a power plant were replaced by the boiler tubes made of the new steel. The boiler has subsequently operated without any trouble for more than 13 000 h at a tube temperature of 600•Ž and a design stress of 85 MPa. These investigations demonstrate that 9Cr0.5Mo -1.8WNb -V steel can replace the 18-8 series austenitic steels and that it is suitable for headers and piping as well as tubes.