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ASTM A199 Heat-exchanger Tubes

ASTM A199 Heat-exchanger Tubes

This specification covedrs several grades of minimum-wall-thickness, chromium-molybdenum and chromium-molybdenum-silicon, seamless, cold-drawn, intermediate alloy steel tubes for heat exchangers, condensers, and similar heat transfer apparatus.

Description

 1.Chemical composition
steel gradeCMnP (max)S (max)SiCrMo
T40.15max0.30-0.600.030.030.50-1.002.15-2.850.44-0.65
T50.5-0.150.30-0.600.030.030.50 max4.00-6.000.45-0.65
T70.15 max0.30-0.600.030.030.50-1.006.00-8.000.45-0.65
T90.15max0.30-0.600.030.030.25-1.008.00-10.00.90-1.10
T110.5-0.150.30-0.600.030.030.50-1.001.00-1.500.44-0.65
T220.5-0.150.30-0.600.030.030.50 max1.90-2.600.87-1.13







2. Mechnical properties
steel grade

Tensile strength

(min)

Yield strength

(Mpa)

Elongation

(%)

Specific requirement
T441517030/22Hardness 85 HRB MAX
T541517030/22Hardness 85 HRB MAX
T741517030/22Hardness 85 HRB MAX
T941517030/22Hardness 85 HRB MAX
T1141517030/22Hardness 85 HRB MAX
T2241517030/22Hardness 85 HRB MAX









 3.Delivery Condition:
  • Heat treatment,Annealed, Normalized, Normalized and Tempered

 4.Surface treatment:
  • Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting

  • Painting as requested.


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