Q460D大直徑厚壁高強(qiáng)度無(wú)縫鋼管的研發(fā)

Research and Development of Q460D Large-sized Heavy-wall High-strength Seamless Steel Tube

摘要: Q460D多用于板材制造,用于制造無(wú)縫鋼管有很大的困難。通過(guò)優(yōu)化Q460D鋼的化學(xué)成分,采用合適的熱處理方法,成功開發(fā)出Q460D大直徑厚壁高強(qiáng)度高韌性結(jié)構(gòu)用無(wú)縫鋼管,其在正火工藝條件下的屈服強(qiáng)度≥440MPa,抗拉強(qiáng)度≥550MPa;縱向伸長(zhǎng)率≥17%;-20℃下的平均縱向沖擊值≥80J,平均橫向沖擊值≥60J;性能滿足客戶要求。

Abstract: Although the Q460D steel is widely used for plate-making,it’s very difficult to make the seamless tube with this type of steel. Nevertheless,a hi-strength and hi-toughness large-sized heavy-wall structure-purposed seamless tube in Q460D steel is successfully developed by means of optimizing the steel’s chemical composition,and adopting proper heat treatment process. Relevant mechanical properties of the tube are as follows. After being normalized,its yield strength is ≥440 MPa;tensile strength ≥550 MPa,and longitudinal elongation ≥17%. And the impact test as made at -20 ℃ to the tube shows that the average longitudinal impact value is ≥80 J,and the average transversal impact value ≥60 J. All the above property test-resulting data are in compliance with relevant customer requirements.