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2007
shandong liaocheng zhongxing steel pipe co.,ltd
seamless steel pipe
GB T5312 Carbon Steel or Carbon Manganese Steel Seamless Pipe for Ship Building diameter from 1/8 inch to 12 inch, wall thickness from 1.2mm to 40mm.
standard :
GB/T8162-1999,
GB/T8163-1999
GB3087-1999
GB5310-1995
GB/T18254-2002
GB/T5312-1999
GB9948-98
GB6479-2000G
B/T3639-2000
GB/T3094-2000
diameter from 1/8 inch to 12 inch, wall thickness from 1.2mm to 40mm