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    4130M-QT-125K大直徑厚壁機械用無縫鋼管的開發(fā)

    Development of Large-sized,Heavy-wall 4130M-QT-125K Mechanical Structure Seamless Steel Tube

    • 摘要: 介紹了4130M-QT-125K大直徑厚壁機械用無縫鋼管的化學(xué)成分、煉鋼-連鑄、軋管和熱處理等工藝的設(shè)計情況，總結(jié)了生產(chǎn)過程中的工藝控制要點。實踐證明：生產(chǎn)的4130M-QT-125K大直徑厚壁機械用無縫鋼管，其工藝設(shè)計合理，幾何尺寸控制精度高；鋼管強度、韌性指標穩(wěn)定，屈服強度Rt0.65在890~1 020 MPa，抗拉強度Rm≥960 MPa，斷后伸長率A≥18%，斷面收縮率Z≥50%，0℃沖擊吸收功≥60 J，剪切斷面率≥80%，全壁厚洛氏硬度在33~37 HRC，各項性能指標達到或超過了客戶協(xié)議要求。

       

      Abstract: Described here in the article are the designs of the large-sized，heavy-wall 4130M-QT-125K mechanical structure seamless steel tube，involving chemical composition，and processes of steel-melting/casting，piperolling and heat treatment，etc.Also summarized are the control tips formanufacturing the said tube.Relevantoperation practice demonstrates thatmanufacturing process as designed for the large-sized，heavy-wall 4130M-QT-125K mechanical structure seamless steel tube is reasonable，and the tube itself is in possession of such characteristics as high controlled-dimensional tolerance，consistent strength and toughness，yield strength：Rt0.65under 890~1 020 MPa，tensile strength：Rm≥960，after-fracture elongation：A≥18%，reduction of area：Z≥50%，impact energy absorption at 0℃：≥60 J，shearing area rate：≥80%，and full wall thickness Rockwell hardness：33~37 HRC. All the property values are up to or even over relevant agreed requirements.

       

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