steel bar, forged, square/flat, dia.150-420mm,length 3m ... carbon steel, ASTM, BS, JIS, DIN etc. Steel Bar. We produce Forging Round and flat Steel Bars- alloy steel ... and quality carbon steel, in diameter 80mm-800mm, such as alloy structural steel, ... Treatment (optional) Standard: ASTM,BS,JIS,DIN etc.Steel Grade (ASTM for example)AISI 1020-1060AISI 5115-5147AISI 4118- 4140 ...