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    • 94. 发明申请
    • Seamless steel pipe and manufacturing method thereof
    • 无缝钢管及其制造方法
    • US20080257459A1
    • 2008-10-23
    • US12010459
    • 2008-01-25
    • Yuji AraiKunio KondoNobuyuki Hisamune
    • Yuji AraiKunio KondoNobuyuki Hisamune
    • C21D9/08
    • C21D8/10C21D9/08C22C38/001C22C38/002C22C38/44C22C38/50C22C38/52
    • The present invention relates to the following seamless steel pipes excellent in strength, toughness and weldability, particularly suitable for submarine flow lines, and a manufacturing method thereof.An as-quenched seamless steel pipe having a chemical composition consisting of, by mass %, C: 0.03 to 0.08%, Mn: 0.3 to 2.5%, Al: 0.001 to 0.10%, Cr: 0.02 to 1.0%, Ni: 0.02 to 1.0%, Mo: 0.02 to 0.8%, Ti: 0.004 to 0.010%, N: 0.002 to 0.008%, Ca: 0.0005 to 0.005%, and the balance Fe and impurities, with not more than 0.25% of Si, not more than 0.05% of P, not more than 0.005% of S, less than 0.005% of Nb, and less than 0.0003% of B as the impurities, and having a microstructure consisting of not more than 20 volume % of polygonal ferrite, not more than 10 volume % of a mixed microstructure of martensite and retained austenite, and the balance bainite. B can be 0.0003 to 0.001%. Mg and/or REM can be contained. The manufacturing method is characterized by the cooling rate during quenching.
    • 本发明涉及以下具有优异的强度,韧性和焊接性的无缝钢管,特别适用于海底流水线及其制造方法。 一种淬火后的无缝钢管,其组成为以质量%计含有C:0.03〜0.08%,Mn:0.3〜2.5%,Al:0.001〜0.10%,Cr:0.02〜1.0%,Ni:0.02〜 1.0%,Mo:0.02〜0.8%,Ti:0.004〜0.010%,N:0.002〜0.008%,Ca:0.0005〜0.005%,余量为Fe和杂质,不大于0.25% 0.05%的P,不大于0.005%的S,小于0.005%的Nb和小于0.0003%的作为杂质的B,并且具有不大于20体积%的多边形铁素体的微结构,不大于 10体积%的马氏体和残余奥氏体的混合显微组织,以及余量的贝氏体。 B可以为0.0003〜0.001%。 可以含有Mg和/或REM。 制造方法的特征在于淬火时的冷却速度。
    • 97. 发明申请
    • Method for producing seamless steel pipe
    • 无缝钢管生产方法
    • US20080121318A1
    • 2008-05-29
    • US12010433
    • 2008-01-24
    • Yuji AraiKeiichi Nakamura
    • Yuji AraiKeiichi Nakamura
    • C21D9/08
    • C22C38/02C21D8/105C21D9/08C22C38/04C22C38/22C22C38/24C22C38/28C22C38/32
    • A seamless steel pipe produced by heating a steel billet, which has a chemical composition C: 0.15 to 0.20%, Si: not less than 0.01% to less than 0.15%, Mn: 0.05 to 1.0%, Cr: 0.05 to 1.5%, Mo: 0.05 to 1.0%, Al≦0.10%, V: 0.01 to 0.2%, Ti: 0.002 to 0.03%, B: 0.0003 to 0.005% and N: 0.002 to 0.01%, further optionally one or more of Ca, Mg and REM in a specific amount, under the provision that the conditions “C+(Mn/6)+(Cr/5)+(Mo/3)≧0.43” and “Ti×N
    • 通过将化学组成C:0.15〜0.20%,Si:0.01〜0.15%,Mn:0.05〜1.0%,Cr:0.05〜1.5%的钢坯加热而制造的无缝钢管, Mo:0.05〜1.0%,Al≤0.10%,V:0.01〜0.2%,Ti:0.002〜0.03%,B:0.0003〜0.005%,N:0.002〜0.01%,进一步可选地, 和REM的量,根据条件“C +(Mn / 6)+(Cr / 5)+(Mo / 3)> = 0.43”和“TixN <0.0002-0.0006xSi” 余量为Fe和杂质,其中杂质中P <= 0.025%,S <= 0.010%,Nb <0.005%,温度为1000〜1250℃,随后在最终轧制温度900〜 1050℃,然后直接从不低于Ar 3 3相变点的温度淬火所得到的钢管,随后在600℃至Ac 1的温度范围内进行回火 转换点,或代替上述制管轧制之后,c 在从3℃相变点到1000℃的温度范围内对所得到的钢管进行互补加热,然后从不低于Ar 3的温度淬火, SUB>相变点,然后在600℃到Ac 1相变点的温度范围内回火,具有高强度和优异的韧性,同时具有高的屈服比,并且在 SSC电阻也。