1. Steel pipes
(1) Seamless steel pipe: material 20#, 45#, 16Mn; Specification Φ57mm-Φ630mm.
(2) High-frequency welded pipe: material Q235A/B; Specification Φ15mm-Φ159mm.
(3) Galvanized pipe: material Q235A/B; Specification Φ15mm-Φ80mm.
(4) Stainless steel pipe: material 304, 316, 321, 430; Specification Φ15mm-Φ159mm.
(5) Cast iron pipe: material is spherulitic graphite cast iron, 18#, 22# pig iron.
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