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11. 发明授权

US06576068B2 Method of producing stainless steels having improved corrosion resistance 有权
标题翻译：具有改善耐腐蚀性的不锈钢的制造方法
公开(公告)号：US06576068B2
公开(公告)日：2003-06-10
申请号：US09841330
申请日：2001-04-24
申请人： John F. Grubb , James D. Fritz
发明人： John F. Grubb , James D. Fritz
IPC分类号： C21D800
CPC分类号： F28F21/082 , C21D1/09 , C21D1/26 , C21D6/004 , C21D2221/00 , C22C38/001 , C22C38/44
摘要： A method for producing a stainless steel with improved corrosion resistance includes homogenizing at least a portion of an article of a stainless steel including chromium, nickel, and molybdenum and having a PREN of at least 50, as calculated by the equation: PREN=Cr+(3.3×Mo)+(30×N), where Cr is weight percent chromium, Mo is weight percent molybdenum, and N is weight percent nitrogen in the steel. In one form of the method, at least a portion of the article is remelted to homogenize the portion. In another form of the method, the article is annealed under conditions sufficient to homogenize at least a surface region of the article. The method of the invention enhances corrosion resistance of the stainless steel as reflected by the steel's critical crevice corrosion temperature.
摘要翻译：用于生产具有改善的耐腐蚀性的不锈钢的方法包括使包含铬，镍和钼的不锈钢的制品的至少一部分均匀化并且具有至少50的PREN，如下式所示：其中Cr是重量钼的重量百分数，钼的重量百分数，N是钢中的重量百分比。在该方法的一种形式中，将物品的至少一部分重熔以使该部分均匀化。在该方法的另一种形式中，制品在足以使制品的至少一个表面区域均匀化的条件下进行退火。本发明的方法提高了钢的临界缝隙腐蚀温度反映的不锈钢的耐腐蚀性。

12. 发明授权

US6036917A Corrosion resistant austenitic stainless steel 有权
标题翻译：耐腐蚀奥氏体不锈钢
公开(公告)号：US6036917A
公开(公告)日：2000-03-14
申请号：US215045
申请日：1998-12-17
申请人： Dominic A. Sorace , John F. Grubb
发明人： Dominic A. Sorace , John F. Grubb
IPC分类号： C21D8/02 , C22C38/00 , C22C38/02 , C22C38/42 , C22C38/44 , C22C38/58 , H04L29/08 , C22C38/34
CPC分类号： C22C38/42 , C22C38/02 , C22C38/44 , C22C38/58
摘要： An alloy having a composition, by weight, of about 0.025% or less carbon, about 0.5 to about 4.1% manganese, about 5.5 to about 6.2% silicon, about 11 to about 15% chromium, about 9.0 to about 15.5% nickel, about 0.8 to about 1.2% molybdenum and about 0.8 to about 2% copper and the remainder being essentially iron with incidental impurities. This composition results in lean alloy content in a high silicon austenitic stainless steel for concentrated sulfuric acid service while maintaining a corrosion rate similar to and competitive with existing alloys for such service. Acceptable characteristics were found when hot working was carried out in the range of about 2100.degree. F. to about 2200.degree. F. Annealing in the range of about 1925.degree. F. to about 2025.degree. F. is preferred, as is rapid water quenching after annealing.
摘要翻译：一种合金，其重量含量为约0.025％或更少的碳，约0.5至约4.1％的锰，约5.5至约6.2％的硅，约11至约15％的铬，约9.0至约15.5％的镍，约 0.8至约1.2％的钼和约0.8至约2％的铜，其余基本上为铁，伴有杂质。该组合物导致用于浓硫酸服务的高硅奥氏体不锈钢中的稀薄合金含量，同时保持与现有合金相似并与之竞争的腐蚀速率。在约2100°F至约2200°F的范围内进行热加工时，发现可接受的特性。优选在约1925°F至约2025°F的范围内退火，如后快速水淬退火。

13. 发明授权

US4911886A Austentitic stainless steel 失效
标题翻译：奥氏体不锈钢
公开(公告)号：US4911886A
公开(公告)日：1990-03-27
申请号：US169520
申请日：1988-03-17
申请人： Richard K. Pitler , John F. Grubb
发明人： Richard K. Pitler , John F. Grubb
IPC分类号： C22C30/00 , C22C38/00 , C22C38/44
CPC分类号： C22C38/44 , C22C30/00 , C22C38/001
摘要： An austenitic alloy is provided having a desirable combination of properties by melting an alloy containing 25 to 27 weight percent chromium, 20 to 40 weight percent nickel, 5 to 7.0 percent molybdenum, 0.25 to 0.30 weight percent nitrogen, and the balance iron and incidental impurities. The alloys exhibit a CCCT value of greater than 49 degrees Centigrade, together with other desirable properties, can be so produced, while maintaining the level of resistance to stress corrosion cracking at a level higher than that of AISI Type 316L stainless steel.

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