(1) The main importing countries for boiler tubes are Japan and Germany. The specifications frequently imported are 15914.2mm; 2734.0mm; 219.110.0mm; 41975mm; 406.460mm, etc. The smallest specification is 31.84.5mm, and the length is generally 5 to 8m.
(2) In the import claim case, the ST45 seamless boiler tubes imported from the Mannesmann Steel Pipe Factory in Germany were found to have internal defects exceeding the factory regulations and the German Steel Association standards after ultrasonic flaw detection.
(3) The alloy steel tubes imported from Germany mainly include 34CrMo4 and 12CrMoV. This type of steel tube has good high temperature performance and is often used as a high temperature boiler tube.
(4) Japan imports a lot of alloy pipes, with specifications of 426.012mm5~8m; 152.48.0mm12m; 89.110.0mm6m; 101.610.0mm12m; 114.38.0mm6m; 127.08.0mm9m, etc. The steel grade in accordance with Japanese Industrial Standard JISG3458 is STPA25. This kind of steel pipe is often used as a matching high-temperature alloy pipe.
