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Products Specification

Method of manufacturing stainless steel pipe for use in piping systems

 

The present invention relates generally to pipe metallurgy and manufacturing processes and, more specifically, to a stainless steel with a chemistry that is compatible with Electric Resistant Welding (ERW) for the manufacture of corrosion and/orerosion resistant stainless steel (pipe) for use in down-hole applications for oil and gas production, line pipe for transportation of liquids, gas and slurry, and process pipe for mining, refining, power generating and petrochemical plant pipingsystems.


   

The above noted problems and other similar corrosion and/or erosion conditions make it desirable to provide a stainless steel pipe. However, the introduction of stainless steel poses additional challenges for the manufacture of pipe of the typeunder consideration. There are two well known commercial processes in use for manufacturing prior art steel pipe such as those used in down-hole applications for oil and gas production, line pipe for transportation of liquids, gas and slurry, andprocess pipe for mining, refining, power generating and petrochemical plant piping systems. These processes produce either "seamless" steel pipe or they produce "welded" steel pipe. In general, a seamless steel pipe is produced by preparing a solidbillet, forming a hollow shell by a method such as Mannesmann piercing, press piercing or hot extrusion, and rolling the thus-formed hollow shell by a rolling mill such as an elongator, plug mill or a mandrel mill and subjecting the rolled hollow shellto a sizing work performed with a sizer or a stretch reducer, whereby the final pipe product of a predetermined size is obtained.


   

The present invention has as one object to manufacture corrosion and/or erosion resistant stainless steel pipe by the ERW welding method without a filler metal from low carbon (0.080% maximum content by weight) dual phase (ferrite plusmartensite) 10.5 to 14% chromium content by weight stainless steel and/or low carbon (0.080% maximum content by weight) martensitic 10.5 to 14% chromium content by weight stainless steel pipe for use in down-hole applications for oil and gas production,line pipe for transportation of liquids, gas and slurry, process plant, power generating and/or refining piping systems.


   

Another object of the present invention is to manufacture corrosion and/or erosion resistant ERW welded pipe without filler metal from low carbon (0.080% maximum content by weight) dual phase (ferrite plus martensite) with 10.5 to 14% chromiumcontent by weight stainless steel and/or low carbon (0.080% maximum content by weight) martensitic stainless steel with 10.5 to 14% chromium content by weight for use in down-hole applications for oil and gas production, line pipe for transportation ofliquids, gas and slurry, process plant, power generating and/or refining piping systems that is more commercially economical than stainless steel pipe with 10.5 to 14% chromium content by weight traditionally welded by TIG, MIG, Plasma Arc, SAW and DSAWwith filler metal for like piping systems which are more costly due to slow forming and welding speeds and the cost of filler metal when compared to the ERW process.


   

Another object of the present invention is to manufacture ERW corrosion and/or erosion resistant welded pipe without a filler metal from low carbon (0.080% maximum content by weight) dual phase (ferrite plus martensite) with 10.5 to 14% chromiumcontent by weight stainless steel and/or low carbon (0.080% maximum content by weight) martensitic stainless steel with 10.5 to 14% chromium by content by weight for use in down-hole applications for oil and gas production, line pipe for transportationof liquids, gas and slurry, process plant, power generating and/or refining piping systems that is more commercially economical than seamless stainless steel pipe with 10.5 to 14% chromium content manufactured by the pierced billet method.


   

Another object of the present invention is to manufacture ERW corrosion and/or erosion resistant welded pipe without a filler metal from low carbon (0.080% maximum content by weight) dual phase (ferrite plus martensite) with 10.5 to 14% chromiumcontent by weight stainless steel and/or low carbon (0.080% maximum content by weight) martensitic stainless steel with 10.5 to 14% chromium content by weight for use in down-hole applications for oil and gas production, line pipe for transportation ofliquids, gas and slurry, process plant, power generating and/or refining piping systems that is equal in mechanical properties to seamless stainless steel pipe with 10.5 to 14% chromium content by weight manufactured by the pierced billet method.


   

Another object of the present invention is to manufacture ERW corrosion and/or erosion resistant welded pipe without a filler metal from low carbon (0.080% maximum content by weight) dual phase (ferrite plus martensite) with 10.5 to 14% chromiumcontent by weight stainless steel and/or low carbon (0.080% maximum content by weight) martensitic stainless steel with 10.5 to 14% chromium content by weight for use in down-hole applications for oil and gas production, line pipe for transportation ofliquids, gas and slurry, process plant, power generating and/or refining piping systems that is equal in quality to seamless stainless steel pipe with 10.5 to 14% chromium content manufactured by the pierced billet method.