求购螺纹接头锻钢制双螺口异径管箍|TFCRClass2000DN2520SH/T3410GB/T14383|ASTM_A105|50件、锻钢制六角头内外螺纹接头|HHBClass2000DN25SH/T3410GB/T14383|ASTM_A105|50件、锻钢制六角头内外螺纹接头|HHBClass2000DN20SH/T3410GB/T14383|ASTM_A105|50件、锻钢制六角头内外螺纹接头|HHBClass2000DN15SH/T3410GB/T14383|ASTM_A105|50件