Manufacturing method of 9-12%cr steel turbine rotor journal and journal produced by the method
A manufacturing method and turbine technology, applied in the direction of manufacturing tools, furnace types, mechanical equipment, etc., can solve the problems of insufficient joint toughness and fatigue strength, etc., and achieve the effect of improving joint toughness, increasing strength, and improving fatigue characteristics
Inactive Publication Date: 2016-06-01
APAN HAMMERED & CASTED STEEL
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Problems solved by technology
[0019] However, in the technology described in Patent Document 1, there is a problem that ferrite is easily generated in the welded joint (hereinafter, simply referred to as the joint), and the toughness and fatigue strength of the joint are insufficient due to this.
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[0040] Next, an embodiment of the present invention will be described with reference to the drawings for understanding of the present invention. It should be noted that, in each figure, parts not relevant to the description may be omitted from illustration. In addition, the ratio (%) of the component composition of a metal represents % by weight.
[0041] The inventors of the present invention experimented under various welding construction conditions combining the component composition of the weld deposit welded to the journal with the welding material, the welding method, and the subsequent heat treatment for stress relief. As a result, it was found that especially by including a small amount of alloy components such as Ni and / or Cr in the weld deposit metal in the inner layer of the journal, and further containing a small amount of V component, it is possible to suppress the joint portion (the weld deposit part and the weld deposit part) 9-12%Cr steel with high fatigue cha...
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Abstract
The invention provides a making method of an axis neck of 9-12% Cr steel turbine rotor and the axis neck produced by the method; in the making method, forming a slope mouth surface on the axis neck of 9-12% Cr steel turbine rotor, forming a lower welding layer on the slope mouth surface through employing a first welding material, and forming an upper welding layer on the lower welding layer through employing a second welding material; the first welding layer comprises: 0.10-0.25wt% of C; 0.20-0.80wt% of Si; 1.0-2.5wt% of Mn; 0.4-1.0wt% of Ni; 1.0-3.0wt%of Cr; 0.2-1.5wt%of Mo; 0.03-0.10wt%of V; and resting content comprises under 0.015wt% of Fe and P, and inevitable foreign matter of under 0.010wt% of S. The second welding material comprises: 0.10-0.25wt% of C; 0.20-0.80wt% of Si; 1.0-2.5wt% of Mn; 0.4-1.0wt% of Ni; 1.0-3.0wt%of Cr; 0.2-1.5wt%of Mo; 0.03-0.10wt%of V; and resting content comprises under 0.015wt% of Fe and P, and inevitable foreign matter of under 0.010wt% of S.
Description
technical field [0001] The invention relates to a method of manufacturing a steam turbine rotor. For example, a 9-12% Cr steel turbine rotor (high-Cr steel turbine rotor) manufacturing method and the Journals produced by this method. Background technique [0002] For example, in order to improve the efficiency of thermal power generation by using higher temperature and high pressure steam in the steam turbine rotor which is the core equipment of thermal power generation, operational reliability is required in addition to high temperature resistance and high pressure resistance. Therefore, as a steam turbine rotor, a high-temperature material, that is, an integrally forged rotor (12% Cr steel rotor) of a 12% Cr steel material excellent in high-temperature creep properties is used. [0003] However, the 12% Cr steel rotor has a problem in that carbon and Cr carbide compounds in the lubricating oil in the journal portion are generated as compared with the low Cr steel rotor, ...
Claims
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IPC IPC(8): B23K31/02B23K35/30F01D5/02C21D9/50
CPCB23K9/042B23K9/18B23K9/235B23K33/00B23K35/3053F01D5/02
Inventor 冈村义弘分岛泰
Owner APAN HAMMERED & CASTED STEEL