Stainless Steel Feedwater Heater Tube

We offer stainless steel feedwater heater tube with many grades, tube is manufactured in various sizes and dimensions, stainless steel materials have good properties and corrosion resistance to stand high pressure in feedwater heater system.

Welded and seamless stainless steel tube are common selected for feedwater heater, the two type tubes have advantages and disadvantages, heater manufacturers and designers should opt proper tube, these tubes are used in thermal power plants and also in nuclear power stations.

Basic specification
Specifications ASTM A249, A269, A688, A803
Tube form straight tube, U bend tube
Grade
  • Austenitic stainless steels
  • Ferritic stainless steels
  • Duplex steel
Finishes
  • annealing pickling
  • bright annealing
Outside diameter 15.88, 19.05, 25.4, 31.8, 38.1 mm
Thickness 0.71, 0.89, 1.0, 1.2, 1.65 mm
Applications heat exchanger, boiler, condenser

Stainless Steel Feedwater Heater Tube Specifications

ASTM/ASME specifications specify feebwater heater tubes requirements, including A249, A268, A688, A803, These specifications were developed for general heat exchanger, condenser and boiler tubes, and provide basic and additional requirements for high quality tubes,

Compared to A249/A268 specifications, A688/A803 specify additional conditions and testing requirement, for quality feedwater heater tubing, A688/A803 standard is good option to meet additional requirement.

ASTM A268 / A268M
Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service

ASTM A249 / A249M
Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes

ASTM A688 / A688M
Seamless and Welded Austenitic Stainless Steel Feedwater Heater Tubes

ASTM A803 / A803M
Seamless and Welded Ferritic Stainless Steel Feedwater Heater Tubes

Common Stainless Steel grade for Feedwater Heater Tube

Grade C Mn P S Si Ni Cr Mo
TP 304 0.08 2.00 0.045 0.030 1.0 8-11 18-20
TP 304L 0.035 2.00 0.045 0.030 1.0 8-13 18-20
TP 316L 0.035 2.00 0.045 0.030 1.0 10-14 16-18  2-3
2205 0.03 2.00 0.03 0.02 1.0 4.5-6.5 22-23  3.0-3.5
TP 439 0.03 1.00 0.040 0.030 1.0 0.5 17-19
TP 446 0.02 1.5 0.040 0.030 1.0 0.75 23-27

Welded and Cold Drawn Stainless Steel Tube

With improvement of technology in welded tube manufacturing, more and more project require welded tubes for feedwater heater system, compared to seamless tube, welded tube have several advantages, like cost effective, short delivery time, tight tolerances and so on.

TIG (tungsten inert gas) welded process is the most commonly used for welded stainless steel tubing, the TIG welding method provides high quality tubes for heater, and enable welding bead and base metal integrity perfect..

Feedwater heater tubes should be annealed as specifications, we have in line heat treatment equipment, which improve performance both the mechanical properties and corrosion resistance.

U bend tube

Stainless steel U bending tube is manufactured intend for heat exchanger, condenser, feedwater heater system, U bend tube max length up to 30 meters, and bending part should be heat treated to remove residual stress, ensure all the part of U bend tube the same quality.

Inspection and Testing

  • Tensile test
  • Flattening test
  • Flaring test
  • Flange test
  • Impact test
  • Hardness test
  • Eddy Current testing
  • Positive Material Identification (PMI)
  • Ultra Sonic testing
  • Hydrostatic testing
  • Bent portion wall thickness checking
Stainless Steel Feedwater Heater Tubestianless steel-u bending tube

DONGSHANG – 19.05 X 1.65 – A688 – 304 – Heat NO.