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    SEAMLESS AUSTENITE HEAT-RESISTANT ALLOY TUBE
    2.
    发明公开
    SEAMLESS AUSTENITE HEAT-RESISTANT ALLOY TUBE 有权
    无缝和耐热合金管奥氏体

    公开(公告)号：EP2781612A4

    公开(公告)日：2016-03-02

    申请号：EP12850463

    申请日：2012-11-07

    申请人： NIPPON STEEL & SUMITOMO METAL CORP

    发明人： JOUTOKU KANA ,  ISEDA ATSURO ,  OKADA HIROKAZU ,  HIRATA HIROYUKI ,  YOSHIZAWA MITSURU

    IPC分类号： C22C19/05 ,  C22C30/00 ,  C22C30/02 ,  C22F1/10

    CPC分类号： C22C19/05 ,  C22C19/053 ,  C22C19/055 ,  C22C19/058 ,  C22C30/00 ,  C22C30/02 ,  C22F1/10

    摘要： A seamless austenitic heat-resistant alloy tube used by fillet-welding the outer surface thereof directly, having a chemical composition consisting, by mass percent, of C: 0.03-0.15%, Si‰¤1%, Mn‰¤2%, P‰¤0.03%, S‰¤0.01%, Ni: 35-60%, Cr: 18-38%, W: 3-11%, Ti: 0.01-1.2%, Al‰¤0.5%, B: 0.0001-0.01%, N‰¤0.02%, and 0‰¤0.008%, and at least one element selected from Zr: 0.01-0.5%, Nb: 0.01-0.5%, and V: 0.01-0.5%, with the balance being Fe and impurities, wherein an average grain diameter d µm at the center of the wall thickness of the tube is 1000 µm or smaller and satisfies the formula (d‰¤1500-2.5×10 5 ×B), the thickness of an oxide layer on the outer surface of the tube is 15 µm or smaller. The tube of the present invention is excellent in weld crack resistance and capable of restraining the generation of cracks in a HAZ at the time of welding.

    METHOD FOR PRODUCING HIGH-STRENGTH SEAMLESS CR-NI ALLOY PIPE
    4.
    发明公开
    METHOD FOR PRODUCING HIGH-STRENGTH SEAMLESS CR-NI ALLOY PIPE 审中-公开
    VERFAHREN ZUR HERSTELLUNG EINES HOCHFESTEN NAHTLOSEN ROHRS AUS EINER CR-NI-LEGIERUNG

    公开(公告)号：EP2415883A4

    公开(公告)日：2017-06-07

    申请号：EP10758614

    申请日：2010-03-29

    申请人： NIPPON STEEL & SUMITOMO METAL CORP

    发明人： OTOME YOHEI ,  IGARASHI MASAAKI ,  OKADA HIROKAZU ,  KONDO KUNIO ,  SAGARA MASAYUKI ,  SHIMODA KAZUHIRO

    IPC分类号： C21D8/10 ,  C21D6/00 ,  C22C1/00 ,  C22C38/00 ,  C22C38/58

    CPC分类号： C21D8/10 ,  C21D6/004 ,  C22C1/002

    摘要： A method for producing a high-strength Cr-Ni alloy seamless pipe, excellent in hot workability and stress corrosion cracking resistance, without causing the lamination during piercing-rolling, comprising: preparing an alloy billet that has a chemical composition comprising, by mass%, of C: 0.05% or less, Si: 1.0% or less, Mn: less than 3.0%, P: 0.005% or less, S: 0.005% or less, Cu: 0.01 to 4.0%, Ni: 25% or more and less than 35%, Cr: 20 to 30%, Mo: 0.01% or more and less than 4.0%, N: 0.10 to 0.30%, Al: 0.03 to 0.30%, O (oxygen): 0.01% or less, REM (rare earth metal): 0.01 to 0.20%, and the balance being Fe and impurities, and satisfying the following formula (1); hot working to make a seamless material pipe on the basis of a cross roll piercing process; subjecting a solution treatment; and cold working. N × P / REM ‰¤ 0.10 wherein P, N and REM in formula (1) represent the contents (mass%) of P, N and REM, respectively. The Cr-Ni alloy may further contain one or more of W, Ti, Nb, Zr, V, Ca and Mg.

    摘要翻译： 本发明提供一种热轧加工性和耐应力腐蚀开裂性优异且不发生穿孔轧制时的层压的高强度Cr-Ni合金无缝管的制造方法，其包括：准备以质量％计含有化学组成的合金坯料， ，C：0.05％以下，Si：1.0％以下，Mn：不到3.0％，P：0.005％以下，S：0.005％以下，Cu：0.01〜4.0％，Ni：25％以上 以下，Cr：20〜30％，Mo：0.01％以上且不足4.0％，N：0.10〜0.30％，Al：0.03〜0.30％，O（氧）：0.01％以下，REM （稀土类金属）：0.01〜0.20％，余量由Fe和杂质构成，满足下式（1）。 热轧工艺，以交叉辊穿孔工艺为基础制造无缝材料管; 进行溶液处理; 和冷的工作。 N×P /REM≤0.10式（1）中的P，N和REM分别表示P，N和REM的含量（质量％）。 Cr-Ni合金还可以含有W，Ti，Nb，Zr，V，Ca和Mg中的一种或多种。

    Ni-BASED ALLOY
    8.
    发明公开
    Ni-BASED ALLOY 有权
    镍基合金

    公开(公告)号：EP2860272A4

    公开(公告)日：2016-02-24

    申请号：EP13800201

    申请日：2013-06-05

    申请人： NIPPON STEEL & SUMITOMO METAL CORP

    发明人： HAMAGUCHI TOMOAKI ,  SEMBA HIROYUKI ,  OKADA HIROKAZU

    IPC分类号： C22C19/05 ,  C22C30/00

    CPC分类号： C22C19/056 ,  C22C19/055 ,  C22C30/00

    摘要： A Ni-based alloy includes, as a chemical composition, C, Si, Mn, Cr, Mo, Co, Al, Ti, B, P, S, and a balance consisting of Ni and impurities. The average grain size d is 10 µm to 300 µm, when the average grain size d is an average grain size in unit of µm of a ³ phase included in a metallographic structure of the Ni-based alloy. Precipitates with a major axis of 100 nm or more are absent in the metallographic structure. An area fraction p is f2 or more, when the area fraction p and the f2 are expressed by using the average grain size d and amounts in mass% of each element in the chemical composition.