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TORICH GB/T30073 Seamless Austenitic Stainless Steel tube for Heat Exchangers Standard: GB/T30073 Material: 06Cr19Ni10, 022Cr19Ni10, 022Cr19Ni10N, 06Cr17Ni12Mo2, 022Cr17Ni12Mo2, 022Cr17Ni12Mo2N, ...