公开(公告)号：US06458318B1

公开(公告)日：2002-10-01

申请号：US09606151

申请日：2000-06-29

Applicant: Yoshitaka Nishiyama ,  Toshiro Anraku ,  Yoshiatsu Sawaragi ,  Kazuhiro Ogawa ,  Hirokazu Okada

Inventor： Yoshitaka Nishiyama ,  Toshiro Anraku ,  Yoshiatsu Sawaragi ,  Kazuhiro Ogawa ,  Hirokazu Okada

IPC: C22C1905

CPC classification number: C22C19/055 ,  C22C19/056

Abstract: A heat resistant Ni base alloy comprises, on a mass% basis, 0.1% or less C, 2% or less Si, 2% or less Mn, 0.005% or less S, 10 to 25% Cr, 2.1 to less than 4.5% Al, 0.08% or less N, 0.001 to 1% in total of one or more elements of B: 0.03% or less, Zr: 0.2% or less and Hf: 0.8% or less, and 2.5 to 15% in total of one or more elements of Mo: 0.01 to 15% and W: 0.01 to 9%. The alloy is suitable as a material for a pipe used in ethylene cracking furnace.

Abstract translation: 耐热Ni基合金以质量％计含有0.1％以下的C，2％以下的Si，2％以下的Mn，0.005％以下的S，10〜25％的Cr，2.1以上且小于4.5％ Al，0.08％以下N，B：0.03％以下的一种以上的元素的总计为0.001〜1％，Zr：0.2％以下，Hf：0.8％以下，总计2.5〜15％ 或更多的Mo元素：0.01〜15％，W：0.01〜9％。 该合金适用于乙烯裂解炉用管材料。

公开(公告)号：US06440234B1

公开(公告)日：2002-08-27

申请号：US09453714

申请日：1999-12-03

Applicant: Hisashi Amaya ,  Toshiro Anraku ,  Yasuyoshi Hidaka

Inventor： Hisashi Amaya ,  Toshiro Anraku ,  Yasuyoshi Hidaka

IPC: C22C3818

CPC classification number: C21D7/06 ,  Y10S148/909

Abstract: A martensitic stainless steel product having a chromium content of 9 to 15% by weight and a surface from which mill scales generated during production are removed by a shot blasting. The surface satisfies that, when a color image of the surface taken with 640×480 pixels is analyzed on blue color and a histogram of the pixel numbers and the tones divided into 0 to 255 classes is obtained, a relationship between the maximum frequency Yp and the tone value Xp at which Yp is counted satisfies an inequality, 800Xp−Yp−27000>0. This steel product is superior in weatherability under atmospheric environments, and also superior in sulfide stress cracking resistance under environments containing hydro-sulfide.

Abstract translation: 通过喷丸除去铬含量为9〜15重量％的马氏体不锈钢产品和在生产过程中产生的氧化皮的表面。 表面满足当以蓝色分析以640×480像素拍摄的表面的彩色图像，并且获得被划分为0至255类的像素数和色调的直方图时，最大频率Yp和色调之间的关系 计数Yp的值Xp满足不等式，800Xp-Yp-27000> 0。 该钢制品在大气环境下的耐候性优异，在含硫化氢的环境下，耐硫化物应力开裂性也优异。