Ferritic / Martenstic Precision Stainless Steel Tubing For Heat Exchanger

ASTM A268 Seamless and Welded Ferritic and Martenstic Stainless Steel                                 Tubing for General Service

Brand : TORICH

Standard: ASTM A268

O.D: 12.7-203mm

Normal W.T : 5.1mm

Application : For boiler and heat-exchange

                                                            Tolerance of Size

   Group                           Size,O.D  in(mm)                             Permissible Variations in O.D in (mm) 

      1                           up to1/2(12.7) ,excl                                    +/- 0.005(0.13) 

                               1/2 to 1,1/2(12.7 to38.1),excl                         +/- 0.005(0.13)

      2                        1,1/2 to 3,1/2 (38.1 to 88.9) excl                   +/- 0.01  (0.25)

      3                        3,1/2 to 5,1/2(88.9 to 139.7) excl                  +/-0.015(0.38)

      4                        5,1/2 to 8 (139.7 to 203.2) incl                      +/-0.03(0.76)

Merchanical Testd Required

Tension Tests

Flaring Test ( for seamless tubes)

Flange Test (for welded tubes)

Hardness Test 

Reverse Flattening Test

Hydrostatic or Nondestructive Electric Test

SUPPLEMENTARY REQUIREMENTS

Air-Underwater Pressure Test

Additional Testing of Welded Tubing per ASME Request.