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    STEEL FOR STEEL TUBE WITH EXCELLENT SULFIDE STRESS CRACKING RESISTANCE
    1.
    发明申请
    STEEL FOR STEEL TUBE WITH EXCELLENT SULFIDE STRESS CRACKING RESISTANCE 有权
    具有优异的耐硫裂纹耐腐蚀性的钢管钢

    公开(公告)号：US20130084205A1

    公开(公告)日：2013-04-04

    申请号：US13702763

    申请日：2011-05-25

    申请人： Mitsuhiro Numata ,  Tomohiko Omura ,  Masayuki Morimoto ,  Toru Takayama ,  Atsushi Soma

    发明人： Mitsuhiro Numata ,  Tomohiko Omura ,  Masayuki Morimoto ,  Toru Takayama ,  Atsushi Soma

    IPC分类号： C22C38/32 ,  C22C38/28 ,  C22C38/24 ,  C22C38/26 ,  C22C38/02 ,  C22C38/22

    CPC分类号： C22C38/32 ,  C21D8/0247 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28

    摘要： The present invention provides a steel which simultaneously satisfies a plurality of characteristics, specifically, a steel for tubes with excellent sulfide stress cracking resistance, including, C: 0.2 to 0.7%; Si: 0.01 to 0.8%; Mn: 0.1 to 1.5%; S: not more than 0.005%; P: not more than 0.03%; Al: 0.0005 to 0.1%; Ti: 0.005 to 0.05%; Ca: 0.0004 to 0.005%; N: not more than 0.007%; Cr: 0. 1 to 1.5%; and Mo: 0.2 to 1.0%; the balance being Fe, Mg and impurities, being characterized in that: the content of Mg is not less than 1.0 ppm and not more than 5.0 ppm; and inclusions of not less than 50% of the total number of those in steel have such a morphology that Mg—Al—O-based oxides exist at the central part of the inclusion, Ca—Al-based oxides enclose the Mg—Al—O-based oxides, and Ti-containing-carbonitrides further exist on a periphery of the Ca—Al-based oxides.

    摘要翻译： 本发明提供一种同时满足多种特性的钢，具体地说，具有优异的耐硫化物应力开裂性的钢，其包括C：0.2〜0.7％， Si：0.01〜0.8％ Mn：0.1〜1.5％ S：不超过0.005％; P：不大于0.03％; Al：0.0005〜0.1％ Ti：0.005〜0.05％ Ca：0.0004〜0.005％ N：不大于0.007％; Cr：0.1〜1.5％ 和Mo：0.2〜1.0％ 余量为Fe，Mg和杂质，其特征在于：Mg的含量不小于1.0ppm且不大于5.0ppm; 并且不少于钢总数的50％的夹杂物具有在夹杂物的中心部存在Mg-Al-O系氧化物的形态，Ca-Al系氧化物包围Mg-Al- O型氧化物和含Ti的碳氮化物进一步存在于Ca-Al系氧化物的周围。

    Steel for steel tube with excellent sulfide stress cracking resistance
    2.
    发明授权
    Steel for steel tube with excellent sulfide stress cracking resistance 有权
    钢管用于钢管，具有优良的耐硫化物应力开裂性能

    公开(公告)号：US09175371B2

    公开(公告)日：2015-11-03

    申请号：US13702763

    申请日：2011-05-25

    申请人： Mitsuhiro Numata ,  Tomohiko Omura ,  Masayuki Morimoto ,  Toru Takayama ,  Atsushi Soma

    发明人： Mitsuhiro Numata ,  Tomohiko Omura ,  Masayuki Morimoto ,  Toru Takayama ,  Atsushi Soma

    IPC分类号： C22C38/28 ,  C22C38/22 ,  C22C38/32 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/24 ,  C22C38/26 ,  C21D8/02

    CPC分类号： C22C38/32 ,  C21D8/0247 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28

    摘要： The present invention provides a steel which simultaneously satisfies a plurality of characteristics, specifically, a steel for tubes with excellent sulfide stress cracking resistance, including, C: 0.2 to 0.7%; Si: 0.01 to 0.8%; Mn: 0.1 to 1.5%; S: not more than 0.005%; P: not more than 0.03%; Al: 0.0005 to 0.1%; Ti: 0.005 to 0.05%; Ca: 0.0004 to 0.005%; N: not more than 0.007%; Cr: 0.1 to 1.5%; and Mo: 0.2 to 1.0%; the balance being Fe, Mg and impurities, being characterized in that: the content of Mg is not less than 1.0 ppm and not more than 5.0 ppm; and inclusions of not less than 50% of the total number of those in steel have such a morphology that Mg—Al—O-based oxides exist at the central part of the inclusion, Ca—Al-based oxides enclose the Mg—Al—O-based oxides, and Ti-containing-carbonitrides further exist on a periphery of the Ca—Al-based oxides.

    摘要翻译： 本发明提供一种同时满足多种特性的钢，具体地说，具有优异的耐硫化物应力开裂性的钢，其包括C：0.2〜0.7％， Si：0.01〜0.8％ Mn：0.1〜1.5％ S：不超过0.005％; P：不大于0.03％; Al：0.0005〜0.1％ Ti：0.005〜0.05％ Ca：0.0004〜0.005％ N：不大于0.007％; Cr：0.1〜1.5％ 和Mo：0.2〜1.0％ 余量为Fe，Mg和杂质，其特征在于：Mg的含量不小于1.0ppm且不大于5.0ppm; 并且不少于钢总数的50％的夹杂物具有在夹杂物的中心部存在Mg-Al-O系氧化物的形态，Ca-Al系氧化物包围Mg-Al- O型氧化物和含Ti的碳氮化物进一步存在于Ca-Al系氧化物的周围。