honed tube

Honed tubes : Grade:ST 52 O.D: 40 to 700mm Max length 12m Straightness: 0.3 -1.0/1000 Tolerance EXT: DIN 2391 Tolerance INT: ISO H8 Roughness(Ra): 0.2 to 0.4 Tensile strength: > 60kgf/mm2 Yield Point: > 52kgf/mm2 Elongation: ≥14% MATERIAL CDS STEEL TUBES STRESS RELIVED BK+S(DIN 2391, PART-2, 1994) CHEMICAL COMPOSITION (%) SiMnCP (Max.)S(Max)0.50Max<=1.60.22Max0.0250.025 MECHANICAL PROPERTIES UTS MinY.S. MinE % MinDELIVERY CONDITION580N/mm2420/580N/mm210STRESS RELIEVED BKS WELD ABILITY STEEL GRADES HAVE A VERY GOOD WELD ABILITY ACCORDINGLY TO THE COMMON WELDING SYSTEM.(CARBON EQUIVALENT 0.45) TOLERANCES 1.OUTER DIA <40mm ±0.2mm FROM 40 TO 100mm ±0.3mm >100mm ±0.5mm 2.WALL THK <120mm OD±5% >120mm ±7.5% 3.STRAIGHTNESS 1/1000 OF THE TUBE LENGTH 4.INSIDE HONNED DIA ISO H8 5.ROUGHNESS 0.2-0.4µ 6.LENGTHS LENGTH<500 +2mm 500<LENGTH<=2000 +3mm 2000<LENGTH<5000 +6mm 5000<LENGTH<7000 +10mm 7.TUBE ENDS TUBE ENDS SHALL BE CUT NOMINALLY SQUARE TO THE TUBE AXIS AND SHALLBE FREE FROM THE EXCESSIVE BURRS 8. APPEARANCE 1. TUBES SHALL HAVE A SMOOTH INTERNAL & EXTERNAL SURFACE CONSISTENT WITH COLD WORKING PROCESS 2. TUBE INNER SURFACE SHOULD BE FREE FROM RUST, DENT & SCRATCHES