MATERIAL

       CDS STEEL TUBES STRESS RELIVED BK+S(DIN 2391, PART-2, 1994)

CHEMICAL COMPOSITION (%)

MECHANICAL PROPERTIES

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