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Q195 Q235B Q355B ASTM A36 A500 GR. C 2 x 6 Square andrectangular steel tube for constructions, US $ 500 - 650 / Ton, API, ASTM, bs, DIN, GB, JIS, API 5L, ASTM A672-2006, BS EN10025, DIN EN 10025, GB 3087-1999, JIS G3444-2006, JIS C8305-1999, JIS G3101, JIS G3429, JIS G3441, 10#-45#, 16mn, A53-A369,