抗潛變經濟型高溫壓力容器用鋼開發

Development of Economical Anti-Creep Steel for High Temperature Pressure Vessel

吳宗峯(Tsung-Feng Wu) ； 陳昱文(Yu-Wen Chen)

《防蝕工程》 36卷2期 (2022/06) Pp. 1-11

https://doi.org/10.6376/JCCE.202206_36(2).0001

摘要

2.25Cr-1Mo鉻鉬鋼具有良好之抗高溫潛變特性性質，故常被使用於焚化爐外殼、高溫儲槽等高溫壓力容器設備。一般利用軋延後空冷＋正常化熱處理＋回火製程方式進行生產，然其製程長、且需經歷多次降溫再升溫程序，對生產成本及能耗表現均有不利的影響。該鋼種除需滿足成分、冶金特性及機械性質之要求外，還需達到規範所要求長時間之抗高溫潛變性質。本研究嘗試以控制軋延時之冶金組織，省略正常化製程後、直接施以回火處理之方式進行此產品開發，藉由評估其產品性質與抗高溫潛變能力，以確認此製程之可行性。試驗結果顯示：以此製程方式生產之鋼材，其機性可符合規範要求。以Larson-Miller參數法進行模擬長時間使用後之高溫潛變性質評估，其結果亦可滿足規範要求、且優於以正常化製程生產之鋼材，成功開發2.25Cr-1Mo抗潛變經濟型高溫壓力容器用鋼。

關鍵字

2.25Cr-1Mo鉻鉬鋼 ； 省製程 ； Larson-Miller參數法 ； 高溫潛變

並列摘要

2.25Cr-1Mo steel is usually designed as the materials for the high temperature Pressure Vessel Plates, such as incinerator shells and high temperature storage tanks because of its excellent properties of resistance to high temperature creep. The steel plate is normally produced by using a combination process of temperature controlled rolling, normalization, and tempering heat treatments. However, its manufacturing process is long, and it needs to go through several cooling and heating procedures, which adversely affects the production cost and energy consumption performance. For this steel, the requirements of the composition, metallurgical and mechanical properties should be met, but also the high temperature creep resistance for the EN specification. In this study, we try to develop the process-saving manufacturing method by controlling the metallurgical structure during the rolling procedure, thus the normalization process can be omitted. The effect of high temperature creep resistance was evaluated to confirm the feasibility of this process. The experimental results show that the metallurgical structure and mechanical properties of the steel produced by this process-saving method can meet specification requirements. The Larson-Miller parameter method is used to evaluate the creep properties of high temperature. The results can also meet the requirements of the specification and are better than the steel produced by the traditional method. The economical anti-creep 2.25Cr-1Mo steel for high-temperature pressure vessel is thus successfully developed.

並列關鍵字

2.25Cr-1Mo steel ； process-saving manufacturing method ； Larson-Miller Parameters ； High temperature creep

參考文獻

ASTM A387/A387M: Standards Specificationfor Pressure Vessel Plates, Alloy Steel,Chromium-Molybdenum, 2017.

EN 10028-2: Flat products made of steels forpressure purposes-Part 2: Non-alloy and alloysteels with specified elevated temperatureproperties, 2017.

T. Kunitake, “Continuous Cooling Transformation Structures in a Low Carbon 2-1/4Cr-1Mo Steel”, Reactor Steel Studies, Cr-MoSteels Research in Japan, ed. Kanji Ono,UCLA-34P177-9/USLA-ENG-7177, 1971.

“Data sheets on the elevated-temperature properties of 2.25Cr-1Mo steel for boiler and heat exchanger seamless tubes (STBA24)”,NRIM Creep Data Sheet No. 3B, (National Research Institute For Metals, Tokyo, Japan,1986).

〝火力發電廠蒸汽管道壽命評估技術導則〞，中國電力企業聯合會DL/T940-2005，2005。