公开(公告)号：US5141705A

公开(公告)日：1992-08-25

申请号：US637144

申请日：1991-01-03

申请人： Peter Stenvall ,  Mats Liljas ,  Bengt Wallen

发明人： Peter Stenvall ,  Mats Liljas ,  Bengt Wallen

IPC分类号： C22C38/44 ,  C22C30/00 ,  C22C38/00 ,  C22C38/58 ,  F28F21/08

CPC分类号： F28F21/082 ,  C22C30/00 ,  C22C38/58

摘要： The invention relates to an austenitic stainless steel having a high tensile strength, a high impact strength, a good weldability and a high corrosion resistance, particularly a high resistance to pitting and crevice corrosion. The steel contains in weight-%:max 0.08 Cmax 1.0 Simore than 0.5 but less than 6 Mnmore than 19 but not more than 28 Crmore than 17 but not more than 25 Nimore than 7 but not more than 10 Mo0.4-0.7 Nfrom traces up to 2 Cu0-0.2 Cebalance essentially only iron, impurities and accessory elements in normal amounts.

公开(公告)号：US5196073A

公开(公告)日：1993-03-23

申请号：US861445

申请日：1992-04-01

申请人： Mats Liljas ,  Jaroslav Pleva ,  Peter Stenvall

发明人： Mats Liljas ,  Jaroslav Pleva ,  Peter Stenvall

IPC分类号： C22C38/44 ,  C22C38/50

CPC分类号： C22C38/50 ,  C22C38/44

摘要： A stainless steel having a two-phase structure of austenite and ferrite, the steel consisting essentially of in weight-% not more than 0.03% C, not more than 0.03% N, the total amount of C+N not being more than 0.05%, 1.5-2.5% Si, 0.5-2% Mn, not more than 0.03% P, not more than 0.010% S, 22-26% Cr, 8-11% Ni, 2-3% Mo, 0.35-0.55% Ti, % Cr+3.3.times.% Mo being at least 29.0, balance iron and impurities, said steel having been subjected to a heat treatment consisting of solution annealing in the temperature range 1100.degree.-1250.degree. C. and water quenching followed by aging in a temperature range 500.degree.-600.degree. C. for at least 30 min, wherein precipitates consisting essentially of Ni.sub.16 Ti.sub.6 Si.sub.7, so called G-phase, are precipitated in the form of particles evenly distibuted in the ferrite, said particles typically having a size of 10-50 .ANG., imparting the material an improved yield srength in the annealed and aged condition, said yield strength amounting to at least 800 MPa in combination with a Charpy V impact strength of at least 25 J, a critical pitting temperature (CPT) higher than about 50.degree. C. in 3% NaCl-solution at 200 mV SCE, and a pitting potential Ep in 0.1N-NaCl-solution, 80.degree. C., of at least about 300 mV SCE.

摘要翻译： 具有奥氏体和铁素体的两相结构的不锈钢，该钢基本上以重量百分比不超过0.03％C，不大于0.03％N，C + N的总量不大于0.05％ ，1.5-2.5％Si，0.5-2％Mn，不大于0.03％P，不大于0.010％S，22-26％Cr，8-11％Ni，2-3％Mo，0.35-0.55％Ti ，％Cr + 3.3x％Mo至少为29.0，余量为铁和杂质，所述钢经过在1100〜1250℃的温度范围内的固溶退火组成的热处理，然后在 温度范围500°-600℃至少30分钟，其中基本上由Ni16Ti6Si7组成的析出物，即所谓的G相，以铁素体中均匀分布的颗粒形式沉淀，所述颗粒通常具有10倍的尺寸， 50 ANGSTROM，赋予材料在退火和老化条件下提高的屈服强度，所述屈服强度达到至少800MPa，与 至少25J的夏比V冲击强度，在200mV SCE下在3％NaCl溶液中的临界点蚀温度（CPT）高于约50℃，在0.1N-NaCl溶液中的点蚀电位Ep，80 至少约300 mV SCE。