公开(公告)号：US20120279607A1

公开(公告)日：2012-11-08

申请号：US13486503

申请日：2012-06-01

Applicant: Yoshitaka NISHIYAMA ,  Mitsuru YOSHIZAWA ,  Masahiro SETO ,  Katsuki TANAKA

Inventor： Yoshitaka NISHIYAMA ,  Mitsuru YOSHIZAWA ,  Masahiro SETO ,  Katsuki TANAKA

IPC: F16L9/00 ,  C21D7/06

CPC classification number: C21D6/004 ,  B21C37/06 ,  B21K21/00 ,  C21D7/06 ,  C21D8/105 ,  C21D9/0068 ,  C21D9/08 ,  C21D2211/001 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  F16L9/02 ,  F22B37/10 ,  F28F21/083 ,  Y10S148/909 ,  Y10T29/479

Abstract: There is provided an austenitic stainless steel pipe excellent in steam oxidation resistance. The austenitic stainless steel pipe excellent in steam oxidation resistance contains, by mass percent, 14 to 28% of Cr and 6 to 30% of Ni, and is configured so that a region satisfying the following Formula exists in a metal structure at a depth of 5 to 20 μm from the inner surface of the steel pipe: (α/β)×δ/ε×100≧0.3 where the meanings of symbols in the above Formula are as follows: α: sum total of the number of pixels of digital image in region in which orientation difference of adjacent crystals detected by electron backscattering pattern is 5 to 50 degrees β: the number of total pixels of digital image in region of measurement using electron backscattering pattern ε: analysis pitch width of electron backscattering pattern (μm) δ: grain boundary width (μm).

Abstract translation: 提供了耐蒸汽抗氧化性优异的奥氏体不锈钢管。 耐蒸汽抗氧化性优异的奥氏体系不锈钢管，以质量％计含有Cr的14〜28％，Ni含量为6〜30％，并且，在金属结构体的深度 从钢管的内表面5〜20μm：（α/＆bgr）×δ/＆egr;×100≥0.3上式中的符号的含义如下：α：像素数的总和 通过电子后向散射图案检测的相邻晶体的取向差为5〜50度的区域中的数字图像的数字图像：使用电子后向散射图案的测量区域中的数字图像的总像素数：电子后向散射的分析间距宽度 图案（μm）δ：晶界宽度（μm）。

公开(公告)号：US08852362B2

公开(公告)日：2014-10-07

申请号：US13486503

申请日：2012-06-01

Applicant: Yoshitaka Nishiyama ,  Mitsuru Yoshizawa ,  Masahiro Seto ,  Katsuki Tanaka

Inventor： Yoshitaka Nishiyama ,  Mitsuru Yoshizawa ,  Masahiro Seto ,  Katsuki Tanaka

IPC: C22C38/18 ,  C21D11/00 ,  C22C38/40 ,  C21D7/06 ,  B21C37/30 ,  F28F21/08 ,  C22C38/04 ,  C21D9/00 ,  C22C38/00 ,  C22C38/42 ,  B21K21/00 ,  B21C37/06 ,  F16L9/02 ,  C22C38/02 ,  C21D6/00 ,  F22B37/10 ,  C22C38/48 ,  C21D8/10 ,  C21D9/08 ,  C22C38/44

CPC classification number: C21D6/004 ,  B21C37/06 ,  B21K21/00 ,  C21D7/06 ,  C21D8/105 ,  C21D9/0068 ,  C21D9/08 ,  C21D2211/001 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  F16L9/02 ,  F22B37/10 ,  F28F21/083 ,  Y10S148/909 ,  Y10T29/479

Abstract: There is provided an austenitic stainless steel pipe excellent in steam oxidation resistance. The austenitic stainless steel pipe excellent in steam oxidation resistance contains, by mass percent, 14 to 28% of Cr and 6 to 30% of Ni, and is configured so that a region satisfying the following Formula exists in a metal structure at a depth of 5 to 20 μm from the inner surface of the steel pipe: (α/β)×δ/ε×100≧0.3 where the meanings of symbols in the above Formula are as follows: α: sum total of the number of pixels of digital image in region in which orientation difference of adjacent crystals detected by electron backscattering pattern is 5 to 50 degrees β: the number of total pixels of digital image in region of measurement using electron backscattering pattern ε: analysis pitch width of electron backscattering pattern (μm) δ: grain boundary width (μm).

Abstract translation: 提供了耐蒸汽抗氧化性优异的奥氏体不锈钢管。 耐蒸汽抗氧化性优异的奥氏体系不锈钢管，以质量％计含有Cr的14〜28％，Ni含量为6〜30％，并且，在金属结构体的深度 从钢管的内表面5〜20μm：（α/＆bgr）×δ/＆egr;×100≥0.3上式中的符号的含义如下：α：像素数的总和 通过电子后向散射图案检测的相邻晶体的取向差为5〜50度的区域中的数字图像的数字图像：使用电子后向散射图案的测量区域中的数字图像的总像素数：电子后向散射的分析间距宽度 图案（μm）δ：晶界宽度（μm）。