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    典型碳鋼高壓鍋爐管帶狀組織成因及其對持久強(qiáng)度的影響

    Cause of Band Structure in Typical Carbon Steel High Pressure Boiler Tube and its Influence on Endurance Strength

    • 摘要: 簡述碳鋼帶狀組織的形成機(jī)理，分析不同煉鋼工藝對熱軋SA210Gr.C、20G碳鋼高壓鍋爐管帶狀組織的影響，研究軋制過程中帶狀組織的變化情況，以及帶狀組織對鋼管持久強(qiáng)度的影響。分析認(rèn)為：采用小規(guī)格管坯軋制及模鑄鍛造工藝，降低Mn含量，能夠在一定程度上減輕軋制后鋼管的帶狀組織；在軋制過程中，即使終軋溫度在1 000℃以上，帶狀組織依然明顯；帶狀組織對持久強(qiáng)度略有影響，但即使存在較嚴(yán)重帶狀組織的鋼管，其持久強(qiáng)度依然能夠滿足相關(guān)標(biāo)準(zhǔn)要求，且有較大富余量。

       

      Abstract: The formation mechanism of band structure in carbon steel is introduced and the influence of different steelmaking processes on band structure in hot-rolled SA210Gr.C and 20G carbon steel high pressure boiler tubes are analyzed.The changing status of the band structure during the rolling process and the influence of the band structure on the creep rupture strength of the tubes are studied.The analysis shows that by adopting the small size billets and the mold casting and forging process，and lowering the content of Mn，the band structure in the rolled tubes may be alleviated to a certain degree.It is found that even when the finishing temperature is above 1 000℃，the band structure is still obvious.The band structure has slight influence on endurance strength，but even for tubes with severe band structure，their endurance strength can still meet the relevant standard requirements with big margin.

       

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