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

ASTM A 803-88 / ASME SA 803

WELDED FERRITIC STAINLESS STEEL FEED WATER HEATER TUBES1

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(%)
Grade	Mfg. Process	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
Grade	Min Yield point	Tensile Strength	Remaks (Similar to JIS)	Possibility Temperature
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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