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ASTM A803 / ASME SA803 / Welded Ferritic Stainless Steel Feed Water Heater Tubes supplier & distributor in India

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ASTM A 803-88 / ASME SA 803 

WELDED FERRITIC STAINLESS STEEL FEED WATER HEATER TUBES
1

This standard is issued under the fixed designation A 803/A 803M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon ( ε) indicates an editorial change since the last revision or reapproval. 

1.Scope 

1.1 This specification covers welded ferritic stainless steel feedwater heater tubes including those bent, if specified, into the from of U-tubes for application in tubular feedwater heaters.

1.2 The tubing sizes covered shall be 5/8 to 1 in. [15.9 to 25.4 mm] inclusive, in outside diameter, and average or minimum wall thicknesses of 0.028 in. [0.7 mm] and heavier.

1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other.

Combing values from the two systems may result in nonconformance with the specification. The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.

Chemical composition 

Grade Mfg. Process Chemical composition(%)
C Si Mn P S Ni Cr Mo Others
TP409 E, W 0.08Max 1.00Max 1.0Max 0.045Max 0.045Max 0.50Max 10.50~11.75 - Ti 6C~0.75
TP439 E, W 0.07Max 1.00Max 1.00Max 0.040Max 0.040Max 0.030Max 17.00~19.00 Ti 0.20+4(C+N)~1.10 Al 0.15Max N 0.14Max
TPXM-27 E, W 0.01Max 0.40Max 0.40Max 0.02Max 0.02Max 0.50Max 25.00~27.5 Mo 0.75~1.50 Cb 0.05~0.20 Cu 0.2Max N 0.015Max
TPXM-33 E, W 0.06Max 0.75Max 0.75Max 0.040Max 0.020Max 0.75~1.00 25.0~27.5 Mo 0.75~1.50 Ti 0.26Max 7(C+N) 1.00Max Cu 0.20Max N 0.040Max
S44635 25-4-4 E, W 0.025Max 0.75Max 1.00Max 0.040Max 0.030Max 3.5~4.5 24.5~26.0 3.5~4.5 N 0.040Max Ti+Cb= 0.2+4(C+N) 0.20~1.00
S44660 26-3-3 E, W 0.030Max 1.00Max 1.00Max 0.040Max 0.030Max 3.5~4.5 24.5~26.0 3.5~4.5 N 0.040Max 6+(C+N) 0.20~1.00
S44700 29-4 E, W 0.010Max 0.20Max 0.30Max 0.025Max 0.025Max 0.15Max 28.0~30.0 0.15Max Cu 0.15Max N 0.25Max
S44800 29-4-2 E, W 0.010Max 0.20Max 0.30Max 0.025Max 0.020Max 2.0~2.5 28.0~30.0 2.0~2.5 0.20Max
S44400 18-2 E, W 0.025Max 1.00Max 1.00Max 0.040Max 0.030Max 1.00Max 17.5~19.5 1.00Max Cu 0.15Max N 0.020Max
S44735 29-4C E, W 0.025Max 1.00Max 1.00Max 0.040Max 0.030Max 1.00Max 28.0~30.0 1.00Max N 0.045Max




Mechanical Properties 


Grade Tensile Test MPa or N/mm2 Remaks (Similar to JIS) Possibility Temperature
Min Yield point Tensile Strength
TP409 205 380Min - -
RP439 205 380Min - -
TPXM-27 275 450Min - -
TPXM-33 310 470Min - -
S44635 25-4-4 450 585Min - -
S44660 26-3-3 450 585Min - -
S44700 29-4 415 550Min - -
S44800 29-4-2 415 550Min - -
S44400 18-2 415 550Min (Ti+Cb)0.20+4(C+N)~0.80 -
S44735 29-4C 415 515Min Ti+Cb=4(C+N)~1.00 0.20Min -




TABLE 1 Chemical Reuqirements 

UNS
DesignationA
Grade
S40900
TP 409
S40335
TP 439
S44627
TP XM-327
S44626
TP XM-33
S44635
25-4-4
S44660
26-3-3
S44700
29-4
S44800
29-4-2
S44735
29-4C
S44500
18-2
Composition, %
C, max 0.08 0.07 0.01C 0.06 0.025 0.030 0.010 0.010 0.030 0.025
Mn,max 1.0 1.00 0.40 0.75 1.00 1.00 0.30 0.30 1.00 1.00
P,max 0.045 0.040 0.02 0.040 0.040 0.040 0.025 0.025 0.040 0.040
S,max 0.045 0.030 0.020.40 0.020 0.030 0.030 0.020 0.020 0.030 0.030
Si,max 1.00 1.00 0.5Dmax 0.75 0.75 1.00 0.20 0.20 1.00 1.00
Ni 0.50max 0.50max 25.0-27.5 0.50max 3.5-4.5 1.0-3.50 2.0-2.5 2.0-2.5 1.00max 1.00max
Cr 10.50-11.75 17.00-19.00 0.75-1.50 25.0-27.0 24.5-26.0 25.0-28.0 28.0-30.0 28.0-30.0 28.00-30.00 17.5-19.5
Mo ... ... ... 0.75-1.00 3.5-4.5 3.0-4.0 3.5-4.2 3.5-4.2 3.60-4.20 1.75-2.50
Al ... 0.15max 0.2max ... ... ... ... ... ... ...
Cu ... ... 0.015max 0.20max ... ... 0.15max 0.15max ... ...
N ... 0.04max ... 0.040max 0.035max 0.040max 0.020maxB 0.020maxc 0.045max 0.035max
Ti 6 x C min;
0.75
max
0.20+4(C+N) min;
1.10max
7X(C+N)
but no
less than
0.20min
1.00max
(Ti+Cb)=
0.20+4
(C+N)
min;0.80
max
(Ti+Cb)=
6 X(C+N)
but no
less than
0.20min
1.00max
(Ti+Cb)=
6 X(C+N)
but no
less than
0.20min
1.00max
(Ti+Cb)=
0.20+4
(C+N)
min;0.80
max
Cb ... ... 0.05-0.20 ... ... ... ... ... ... ...




ACarbon plus nitrogen = 0.025max. BFor small diameter or thin walls, or both, tubing, where many drawing passes
are required, a carbon maximum of 0.015% is necessary. Small outside diameter tubes are defined as those less
than 0.500 in. [12.7mm] in outside diameter and light wall tubes as those less than 0.049 in.[1.2mm] in everage 
wall thickness (0.040 in. [1mm]. in minimum wall thickness). CNickel plus copper.

TABLE 2 Tensile Requirements 

Grade Tensile
Strength, min,
ksi [MPa]
Yield Strength,
min, ksi [MPa]
ElongationA in
2 in. or 50mm
min, %
TP 409 55[380] 30[205] 20
TP 439 60[415] 30[205] 20
TP XM-27 65[450] 40[275] 20
TP XM-33 68[410] 45[310] 20
25-4-4 90[620] 75[515] 20
26-3-3 85[585] 65[450] 20
29-4 80[550] 60[415] 20
29-4-2 80[550] 60[415] 20
18-2 60[415] 35[240] 20
29-4C 75[515] 60[415] 18




AFor longitudinal strip tests, a deduction of 0.60% for 29-4C, 0.90% for for 29-4C and 1% for all other grades shall be 
made from the basic minimum elongation for each 1/32 in. [0.8mm] decrease in wall thickness below 5/16 in.[8mm]. 
The following table gives the computed minimum values :

Wall Thickness in. Elongation in 2 in. or 50mm, min, %
in. mm 29-4C TP XM-27 All other Grades
5/16[0.312] 8 12 18 20
9/32[0.281] 7.2 11 17 19
1/4[0.250] 6.4 11 16 18
7/32[0.219] 5.6 10 15 17
3/16[0.188] 4.8 10 14 16
5/32[0.156] 4 9 13 15
1/8[0.125] 3.2 8 13 14
3/32[0.332] 2.4 8 12 13
1/16[0.062] 1.6 7 11 12
0.062 to 0.035, excl 1.6 to 0.9 7 10 12
0.035 to 0.222, excl 0.9 to 0.6 7 10 11
0.022 to 0.015, excl 0.6 to 0.4 6 10 11




NOTE - The above taaable gives the computed minimum elongation values for each 1/32 in.[0.8mm] decrease 
in wall thickness. Where the wall thickness lies between two values shown above, the minimum elongation value 
shall be determined by the following equation : 


Grade Equation :B
29-4C E = 28.8t + 9.00
[E = 1.13t + 9.00]
All Other E = 32t + 10.00
[E = 1,25t +10.00]




All Other Grades E = 32t + 10.00 [c where : E = elongation in 2 in. or 50mm, %, and
t = actual thickness of specimens, in.[mm].
BCalculated elongation requirements shall be rounded to the nearest whole number. 



TABLE 3 Hardness Requirements 

Grade Brinell Hardness, max Rockwell Hardness,
B Scale, max
TP 409 207 95
TP 439 207 95
TP XM-27 241 100
TP XM-33 241 100
25-4-4 270 27A
26-3-3 265 25A
29-4 241 100
29-4-2 241 100
18-2 217 95
29-4C 241 100



ARockwell hardness, C scale. 10.3 The appearance of any fissures or cracks in the test specimen when evaluated in 
accordance with the Evaluation Sections of Practices A 763 indicating the presence of intergranular attack, 
shall be cause for rejection of that lot. 

TABLE 4 Tube Leg Length Tolerance 

Leg Lneght, ft[m] Plus Tlerance, in.[mm]
Up to 20 [6], incl 1/8 [3.2]
Over 20 to 30 [6 to 9], incl 5/23 [4.0]
Oer 30 to 40[9 to 12], incl 3/16 [4.8]




TABLE 5 Squareness of Ends Tolerance
 

Tube OD, in.[m] Tolerance, in.[mm]
Up to 5/8 [15.9], incl 0.010 [0.25]
Over5/8 to 1 in.[15.9 to 25.4], incl 0.016 [0.41]

 

TABLE S1.1 Notch Depth 

OD, IN.[MM] Wall, in[mm] Depth, in.[mm]A Length, max, in.[mm] Width, max
5/8 to 1 [15.9 to 25.4] incl 0.028[0.71] and heavier 0.045 [0.11] or 10% of wall thickness, 
whichever is greater
0.375[9.52] wall thickness, but not
greater than 0.062 in.[1.6mm]


A The tolerance of notch depth shall be ±8% or ±0.0005 in. [0.01mm], whichever is greater. Refer to Fig. 

2 for location orientation and length of calibration standard.

TABLE S1.2 Notch Depth for Select Commercial Grade

OD, IN.[MM] Wall, in[mm] Depth, in.[mm]A Length, max, in.[mm] Width, max
5/8 to 1 [15.9 to 25.4] incl 0.035[0.9] and heavier 0.045 [0.11] or 10% of wall thickness, 
whichever is greater
0.375[9.52] 3 times notch depth
5/8 to 1 [15.9 to 25.4] incl 0.035[0.9] and heavier 0.045 [0.11] or 10% of wall thickness, 
whichever is greater
0.375[9.5] wall thickness

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