ASTM A268/ A268M




ASTM A268 Tubing, ASME SA268 TP410, ASTM A268 TP 439

ASTM A268 Tubing

ASTM A268 specification covers standard specification for a number of grades of nominal-wall-thickness, welded ferritic and martensitic stainless steel tubing for general corrosion-resisting and high-temperature service. ASTM A268 tubes shall be made by seamless and welded process with no filler metal added.As a final heat treatment ASTM A268 Tubing shall be reheated to temperature of 1200°F [650° C] or higher and cooled to meet the requirements of specification.SS 410 Welded Tubes stainless steel is soaked at 649-760°C (1200-1400°F) and then cooled in air. Shielded fusion and resistance methods are recommended for welding grade Stainless Steel 430 Seamless Tubes stainless steel.Oxyacetylene welding is not suitable for this stainless steel grade.Hardening of ASTM A268 tp439 Seamless Tubing is controlled by the use of 405 Cb electrodes that contain columbium.Ductility of AISI 405 Seamless Tubes is maximized by post weld annealing.ASME SA268 Stainless Steel 409 Welded Tubes are soaked at 817-871°C (1500-1600°F) and the temperature is then increased to 1038-1121°C (1900-2050°F). ASTM A268 Stainless Steel 429 Seamless Tubes can be hardened by soaking at 982-1010°C (1800-1850°F) and then oil quenched.

ASTM A268 Specification

Specifications : ASTM A268 / SA 268
Dimensions : ASTM, ASME and API
Size : 1/4" (6.25mm) to 8" (203mm), WT 0.02" (0.5mm) to 0.5"(12mm)
Schedule : SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Specialized in : Large Diameter Size
Length : Single Random, Double Random & Cut Length.
Form : Round, Square, Rectangular, Hydraulic Etc
End : Plain End, Beveled End, Treaded

ASTM A268 Chemical Composition

Grade TP 405 TP 410 TP 429 TP 430 TP 443 TP 446-1 TP 446-2A TP 409
UNS
DesignationB
S40500 S41000 S42900 S43000 S44300 S44600 S44600 S40800 S40900
Element Composition, %
C, max 0.18 0.15 0.12 0.12 0.20 0.20 0.12 0.08 0.08
Mn, max 1.00 1.00 1.00 1.00 1.00 1.50 1.50 1.00 1.00
P, max 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.045 0.045
S, max 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.045 0.045
Si, max 0.75 0.75 0.75 0.75 0.75 0.75 0.75 1.00 1.00
Ni 0.50max 0.50max 0.50max 0.50max 0.50max 0.50max 0.50max 0.80max 0.50max
Cr 11.5-13.5 11.5-13.5 14.0-16.0 16.0-18.0 18.0-23.0 23.0-30.0 23.0-30.0 11.5-13.0 10.50-11.75
Mo
Al 0.10-0.30
Cu 0.90-0.25
N 0.10-0.25 0.10-0.25
Ti 12xC min;
1.10max
6xC min;
0.75max

ASTM A268 Stainless Steel Tube Sizes

Nominal
Pipe
Size
(inches)
Outside
Diameter
Schedule
5S
10S
40S
80S
(mm)
(inches)
Wall Thickness and Weight
mm
(in)
kg/m
mm
(in)
kg/m
mm
(in)
kg/m
mm
(in)
kg/m
1/8
10.3
0.405
1.25
(0.049)
0.28
1.73
(0.068)
0.37
2.42
(0.095)
0.47
1/4
13.7
0.540
1.66
(0.065)
0.49
2.24
(0.088)
0.63
3.03
(0.119)
0.80
3/8
17.2
0.675
1.66
(0.065)
0.63
2.32
(0.091)
0.85
3.20
(0.126)
1.10
1/2
21.3
0.840
1.65
(0.065)
0.81
2.11
(0.083)
1.00
2.77
(0.109)
1.27
3.74
(0.147)
1.62
3/4
26.7
1.050
1.65
(0.065)
1.02
2.11
(0.083)
1.28
2.87
(0.113)
1.68
3.92
(0.154)
2.20
1
33.4
1.315
1.65
(0.065)
1.30
2.77
(0.109)
2.09
3.38
(0.133)
2.50
4.55
(0.179)
3.24
1 1/4
42.2
1.660
1.65
(0.065)
1.66
2.77
(0.109)
2.69
3.56
(0.140)
3.39
4.86
(0.191)
4.47
1 1/2
48.3
1.900
1.65
(0.065)
1.91
2.77
(0.109)
3.11
3.69
(0.145)
4.06
5.08
(0.200)
5.41
2
60.3
2.375
1.65
(0.065)
2.40
2.77
(0.109)
3.93
3.92
(0.154)
5.45
5.54
(0.218)
7.49
2 1/2
73.0
2.875
2.11
(0.083)
3.69
3.05
(0.120)
5.26
5.16
(0.203)
8.64
7.01
(0.276)
11.4
3
88.9
3.500
2.11
(0.083)
4.52
3.05
(0.120)
6.46
5.49
(0.216)
11.3
7.62
(0.300)
15.3
3 1/2
101.6
4.000
2.11
(0.083)
5.18
3.05
(0.120)
7.41
5.74
(0.226)
13.6
8.08
(0.318)
18.6
4
114.3
4.500
2.11
(0.083)
5.84
3.05
(0.120)
8.37
6.02
(0.237)
16.1
8.56
(0.337)
22.3
5
141.3
5.563
2.77
(0.109)
9.46
3.41
(0.134)
11.6
6.56
(0.258)
21.8
9.53
(0.375)
31.0
6
168.3
6.625
2.77
(0.109)
11.3
3.41
(0.134)
13.9
7.12
(0.280)
28.3
10.98
(0.432)
42.6
8
219.1
8.625
2.77
(0.109)
14.8
3.76
(0.148)
20.0
8.18
(0.322)
42.5
12.70
(0.500)
64.6
10
273.1
10.750
3.41
(0.134)
22.7
4.20
(0.165)
27.8
9.28
(0.365)
60.4
12.70
(0.500)
81.5
12
323.9
12.750
3.97
(0.156)
31.3
4.58
(0.180)
36.1
9.53
(0.375)
73.9
12.70
(0.500)
97.4

ASTM A268 Tube Dimensions

NB Size OD 40S 5S 10S S10 S20 S40 S60 XS/80S S80 S100 S120 S140 S160 XXS
mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm
  1/8” 10.29     1.2     1.73     2.41          
  1/4” 13.72     1.7     2.24     3.02          
  3/8” 17.15     1.7     2.31     3.2          
15 1/2” 21.34 2.8 1.7 2.1     2.77   3.73 3.73       4.78 7.47
20 3/4” 26.67 2.9 1.7 2.1     2.87   3.91 3.91       5.56 7.82
25 1” 33.4 3.4 1.7 2.8     3.38   4.55 4.55       6.35 9.09
32 1 1/4” 42.16 3.6 1.7 2.8     3.56   4.85 4.85       6.35 9.7
40 1 1/2” 48.26 3.7 1.7 2.8     3.68   5.08 5.08       7.14 10.2
50 2” 60.33 3.9 1.7 2.8     3.91   5.54 5.54       9.74 11.1
65 2 1/2” 73.03 5.2 2.1 3.1     5.16   7.01 7.01       9.53 14
80 3” 88.9 5.5 2.1 3.1     5.49   7.62 7.62       11.1 15.2
90 3 1/2” 101.6 5.7 2.1 3.1     5.74   8.08 8.08          
100 4” 114.3 6 2.1 3.1     6.02   8.56 8.56   11.1   13.5 17.1
125 5” 141.3 6.6 2.8 3.4     6.55   9.53 9.53   12.7   15.9 19.1
150 6” 168.3 7.1 2.8 3.4     7.11   10.97 11   14.3   18.3 22
200 8” 219.1 8.2 2.8 3.8   6.4 8.18 10.3 12.7 12.7 15.1 19.3 20.6 23 22.2
250 10” 273.1 9.3 3.4 4.2   6.4 9.27 12.7 12.7 15.1 19.3 21.4 25.4 28.6 25.4
300 12” 323.9 9.5 4 4.6   6.4 10.3 14.3 12.7 17.5 21.4 25.4 28.6 33.3 25.4
350 14” 355.6 9.5 4 4.8 6.4 7.9 11.1 15.1 12.7 19.1 23.8 27.8 31.8 35.7  
400 16” 406.4 9.5 4.2 4.8 6.4 7.9 12.7 16.7 12.7 21.4 26.2 31 36.5 40.5  
450 18” 457.2 9.5 4.2 4.8 6.4 7.9 14.3 19.1 12.7 23.8 29.4 34.9 39.7 45.2  
500 20” 508 9.5 4.8 5.5 6.4 9.5 15.1 20.6 12.7 26.2 32.5 38.1 44.5 50  
550 22” 558.8 9.5 4.8 5.5 6.4 9.5   22.2 12.7 28.6 34.9 41.3 47.6 54  
600 24” 609.6 9.5 5.5 6.4 6.4 9.5 17.5 24.6 12.7 31 38.9 46 52.4 59.5  
650 26” 660.4 9.5     7.9 13     12.7            
700 28” 711.2 9.5     7.9 13     12.7            
750 30” 762 9.5 6.4 7.9 7.9 13     12.7            
800 32” 812.8 9.5     7.9 13 17.5   12.7            
850 34” 863.6 9.5     7.9 13 17.5   12.7            
900 36” 914.4 9.5     7.9 13 19.1   12.7            

ASTM A268 Pressure Ratings

OD inches Ave. Wall inches Min Yield Strength (PSI) Min Tensile Strength (PSI) Theoretical Burst Pressure * (PSI) Working Pressure (PSI) 25% of Burst Theoretical Yield Point ** (PSI) Collapse Pressure *** (PSI)
0.250 0.020 30,000 75,000 14,286 3,571 5,714 4,416
0.250 0.028 30,000 75,000 21,649 5,412 8,660 5,967
0.250 0.035 30,000 75,000 29,167 7,292 11,667 7,224
0.250 0.049 30,000 75,000 48,355 12,089 19,342 9,455
0.250 0.065 30,000 75,000 81,250 20,313 32,500 11,544
0.375 0.020 30,000 75,000 8,955 2,239 3,582 3,029
0.375 0.028 30,000 75,000 13,166 3,292 5,266 4,145
0.375 0.035 30,000 75,000 17,213 4,303 6,885 5,077
0.375 0.049 30,000 75,000 26,534 6,634 10,614 6,816
0.375 0.065 30,000 75,000 39,796 9,949 15,918 8,597
0.500 0.020 30,000 75,000 6,522 1,630 2,609 2,304
0.500 0.028 30,000 75,000 9,459 2,365 3,784 3,172
0.500 0.035 30,000 75,000 12,209 3,052 4,884 3,906
0.500 0.049 30,000 75,000 18,284 4,571 7,313 5,304
0.500 0.065 30,000 75,000 26,351 6,588 10,541 6,786
0.500 0.083 30,000 75,000 37,275 9,319 14,910 8,307
0.625 0.020 30,000 75,000 5,128 1,282 2,051 1,859
0.625 0.028 30,000 75,000 7,381 1,845 2,953 2,568
0.625 0.035 30,000 75,000 9,459 2,365 3,784 3,172
0.625 0.049 30,000 75,000 13,947 3,487 5,579 4,335
0.625 0.065 30,000 75,000 19,697 4,924 7,879 5,591
0.625 0.083 30,000 75,000 27,124 6,781 10,850 6,910
0.625 0.095 30,000 75,000 32,759 8,190 13,103 7,734
0.625 0.109 30,000 75,000 40,172 10,043 16,069 8,639
0.750 0.028 30,000 75,000 6,052 1,513 2,421 2,156
0.750 0.035 30,000 75,000 7,721 1,930 3,088 2,669
0.750 0.049 30,000 75,000 11,273 2,818 4,509 3,664
0.750 0.065 30,000 75,000 15,726 3,931 6,290 4,749
0.750 0.083 30,000 75,000 21,318 5,330 8,527 5,905
0.750 0.095 30,000 75,000 25,446 6,362 10,179 6,637
0.750 0.109 30,000 75,000 30,733 7,683 12,293 7,453
0.750 0.120 30,000 75,000 35,294 8,824 14,118 8,064
0.875 0.020 30,000 75,000 3,593 898 1,437 1,340
0.875 0.028 30,000 75,000 5,128 1,282 2,051 1,859
0.875 0.035 30,000 75,000 6,522 1,630 2,609 2,304
0.875 0.049 30,000 75,000 9,459 2,365 3,784 3,172
0.875 0.065 30,000 75,000 13,087 3,272 5,235 4,126
0.875 0.083 30,000 75,000 17,560 4,390 7,024 5,152
0.875 0.095 30,000 75,000 20,803 5,201 8,321 5,807
0.875 0.109 30,000 75,000 24,886 6,221 9,954 6,543
0.875 0.120 30,000 75,000 28,346 7,087 11,339 7,100
1.000 0.028 30,000 75,000 4,449 1,112 1,780 1,633
1.000 0.035 30,000 75,000 5,645 1,411 2,258 2,027
1.000 0.049 30,000 75,000 8,149 2,037 3,259 2,796
1.000 0.065 30,000 75,000 11,207 2,802 4,483 3,647
1.000 0.083 30,000 75,000 14,928 3,732 5,971 4,567
1.000 0.095 30,000 75,000 17,593 4,398 7,037 5,159
1.000 0.109 30,000 75,000 20,908 5,227 8,363 5,827
1.000 0.120 30,000 75,000 23,684 5,921 9,474 6,336
1.000 0.134 30,000 75,000 27,459 6,865 10,984 6,963
1.250 0.035 30,000 75,000 4,449 1,112 1,780 1,633
1.250 0.049 30,000 75,000 6,380 1,595 2,552 2,260
1.250 0.065 30,000 75,000 8,705 2,176 3,482 2,958
1.250 0.083 30,000 75,000 11,485 2,871 4,594 3,719
1.250 0.095 30,000 75,000 13,443 3,361 5,377 4,213
1.250 0.109 30,000 75,000 15,843 3,961 6,337 4,776
1.250 0.120 30,000 75,000 17,822 4,455 7,129 5,207
1.250 0.134 30,000 75,000 20,468 5,117 8,187 5,742
1.500 0.035 30,000 75,000 3,671 918 1,469 1,367
1.500 0.049 30,000 75,000 5,243 1,311 2,097 1,896
1.500 0.065 30,000 75,000 7,117 1,779 2,847 2,487
1.500 0.083 30,000 75,000 9,333 2,333 3,733 3,136
1.500 0.095 30,000 75,000 10,878 2,719 4,351 3,559
1.500 0.109 30,000 75,000 12,754 3,188 5,101 4,043
1.500 0.120 30,000 75,000 14,286 3,571 5,714 4,416
1.500 0.134 30,000 75,000 16,315 4,079 6,526 4,881
1.500 0.148 30,000 75,000 18,439 4,610 7,375 5,336
1.750 0.035 30,000 75,000 3,125 781 1,250 1,176
1.750 0.049 30,000 75,000 3,864 966 1,546 1,434
1.750 0.065 30,000 75,000 6,019 1,505 2,407 2,146
1.750 0.083 30,000 75,000 7,860 1,965 3,144 2,711
1.750 0.095 30,000 75,000 9,135 2,284 3,654 3,080
1.750 0.109 30,000 75,000 10,672 2,668 4,213 3,504
1.750 0.120 30,000 75,000 11,921 2,980 4,768 3,832
1.750 0.134 30,000 75,000 13,563 3,391 5,425 4,242
1.750 0.148 30,000 75,000 15,268 3,817 6,107 4,645
1.750 0.165 30,000 75,000 17,430 4,357 6,972 5,124
2.000 0.035 30,000 75,000 2,720 680 1,088 1,032
2.000 0.049 30,000 75,000 3,864 966 1,546 1,434
2.000 0.065 30,000 75,000 5,214 1,303 2,086 1,887
2.000 0.083 30,000 75,000 6,788 1,697 2,715 2,387
2.000 0.095 30,000 75,000 7,873 1,968 3,149 2,715
2.000 0.109 30,000 75,000 9,175 2,294 3,670 3,092
2.000 0.120 30,000 75,000 10,227 2,557 4,091 3,384
2.000 0.134 30,000 75,000 11,605 2,901 4,642 3,751
2.000 0.148 30,000 75,000 13,028 3,257 5,211 4,111
2.000 0.165 30,000 75,000 14,820 3,705 5,928 4,542

ASTM A268 Tensile Requirement

Grade and UNS Designation Tensile strength,
min,
ksi[MPa]
Yield strength,
min
ksi[MPa]
ElongationA
in 2 in or 50
mm, min,%
TP 405 
S40500
30[415] 30[205] 20

S40800
55[380] 30[205] 20
TP 410
S41000
60[415] 30[215] 20
TP 429, TP 430, and TP 430 Ti
S429000, S43000, and S43036
60[415] 35[240] 20
TP 443
S44300
70[485] 40[275] 20
TP 446-1
S44600
70[485] 40[275] 18
TP 446-2
S44600
65[450] 40[275] 20
TP 409
S40900
55[380] 30[205] 20
TP 439
S43035
60[415] 30[205] 20

S41500
115[795] 90[620] 15
TPXM-27
S44627
65[450] 40[275] 20
TPXM-33
S44626
68[470] 45[310] 20
18Cr-2Mo
S44400
60[415] 40[275] 20
29-4 and 29-4-2
S44700 and S44800
80[550] 60[415] 20
26-3-3
S44600
85[585] 65[450] 20
25-4-4
S44635
90[620] 75[515] 20

S44735
75[515] 60[415] 15
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