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    Q690E海事起重船主弦桿用無縫鋼管的開發(fā)

    Development of Q690E Seamless Steel Pipe for Service as Main Rod of Marine Crane Ship

    • 摘要: 1 600 t級(jí)海事起重船主弦桿用Φ630 mm×30 mm規(guī)格Q690E鋼級(jí)無縫鋼管，一直以來無法順利實(shí)現(xiàn)熱軋生產(chǎn)。通過優(yōu)化鋼種化學(xué)成分，使鋼種1 200℃時(shí)的熱塑性達(dá)到40.8%，有效降低了軋制力及生產(chǎn)難度；控制鋼種的碳當(dāng)量在0.62%以下，保證了材料的可焊性；生產(chǎn)前進(jìn)行端部淬火試驗(yàn)并測量相變點(diǎn)，熱處理采用浸入式淬火，保證了管材的淬透性，熱處理加熱制度為940℃水淬+650℃回火空冷。最終使得產(chǎn)品的屈服強(qiáng)度達(dá)到760 MPa以上。

       

      Abstract: It has not been all along realized to smoothly produce the Φ630 mm×30 mm Q690E seamless steel pipe for service as the main rod of the 1 600 t marine crane ship with the hot-rolling process.The rolling force and the operation difficulty are remarkably reduced by means of optimizing chemical composition of the steel to get its thermal plasticity up to 40.8%at 1 200℃;the weldability of the steel is guaranteed owing to the steel carbon equivalent that is well controlled to be under 0.62%;and prior to rolling the pipe, pipe-end quench test is conducted, and the transformation point is measured, and dip quench process employed, thus the hardenability of the pipe is ensured.The heat schedule is 940℃water-quench plus 650℃ tempering-air cooling.Thanks to implementation of all the measures as above mentioned, the yield strength of the said pipe has been finally enhanced to at least 760 MPa.

       

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