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ASTM A 106-89 / ASME SA 106

Standard Specification for 

Seamless Carbon Steel Pipe for High Temperature Service

This standard is issued under the fixed designation A 106; 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. This specification has been approved for use by agencies of the Department of Defense. Consult the DoD Index of Specifications and Standards for specific year of issue which has been adopted by the Department of Defense. 

1.Scope 

1.1 This specification covers seamless carbon steel pipe for high-temperature service (Note 1) in NPS 1/8 to NPS 48 inclusive, with nominal 9average0 wall thickness as given is ANSI B36.10. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification. Pipe ordered under this specification shall be suitable for bending, flanging, and similar forming operations, and for welding. When the steel is to be welded, it is presupposed that a welding procedure suitable to the grade of steel and intended use or service will be utilized (Note 2).

NOTE 1 ? Consideration should be given to possible graphitization of the material at the higer temperatures at which it may be used.

NOTE 2 ? Grades A rather than Grades B or Grades C pipe should be used for close coiling, or cold bending. 

The purpose for which the pipe is to be used should be stated in the order. This note is not intended to prohibit the cold bending of Grades B seamless pipe. 1.2 Supplementary requirements (S1 to S4) of an optional nature are provided for seamless pipe intended for use in applications where a superior grade of pipe is required. These supplementary requirements call for additional tests to be made and when desired shall be so stated in the order.


1.3 When these products are to be used in applications conforming to ISO Recommendations for Boiler Construction, the requirements of Specification A 520 (Mechanical Property Requirements Section) shall supplement and supersede the requirements of this specification.


1.4 The values stated in inch-pound units are to be regarded as the standard. NOTE 3 ? The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as "nominal diameter", "size", and "nominal size". 


1.5 The following precautionary caveat pertains only to the test method portion, Sections 11, 12, 13, 14, and 15, of this specification; This standard does not purport to address all of the safety problem, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Chemical composition

Grade Mfg. process Chemical Composition (%)
C Si Mn P S
Gr A S 0.25Max 0.10Min 0.27~0.98 0.025Max 0.025Max
Gr B S 0.30Max 0.10Min 0.29~1.06 0.025Max 0.025Max
Gr C S 0.35Max 0.10Min 0.29~1.06 0.025Max 0.025Max

Mechanical Properties 

Grade Tenssile Test MPa or N/mm2  Remarks (Similar to JIS) possibility temperature
MIn. Yield Point Tensile Strength
Gr A 205 330Min  (STPG370)
Gr B  240 415Min  (STPG410)
Gr C 275 485Min  (STPG480)

Chemical Composition

The steel shall conform to the requirements as to chemical composition presribed in Tables 1 and 2.

Table 1 Chemical Requirements

- Composition, %
Grade A Grade B Grade C
Carbon, maxA 0.25 0.30 0.35
Manganese 0.27-0.93 0.29-1.06 0.29-1.06
Phosphorus, max 0.035 0.035 0.035
Sulfur, max 0.035 0.035 0.035
Silicon, min ss0.10 0.10 0.10

AFor each reduction of 0.01% below the specified carbon maximum, an increase of 0.06% manganese above the 
specified maximum will be permitted up to a maximum of 1.35%

Table 2 Limits on Unspecified Elements 

Element A Composition, % max
Grade A Grade B Grade C
Chrome 0.40 0.40 0.40
Copper 0.40 0.40 0.40
Molybdenum 0.15 0.15 0.15
Nickel 0.40 0.40 0.40
Vanadium 0.08 0.08 0.08

AThese five elements combined shall not exceed shall not exceed 1%.

Table3 Tensile Requirements

- Grade A(Explanatory Note 2) Grade B Grade C
Tensile strength, min, psi (MPa)
Yield strength, min, psi(MPa) Elongation in 2 in. or 50 mm, min, %
Basic minimum elongation transverse strip tests, and for all small sizes tested in full section
When standard round 2-in. or 50-mm gage length test specimen is used
For longitudinal strip tests
For transvere strip tests. a deduction for each 1/32-in. (0.8-mm) decrease in wall thickness below 5/16 in. (7.9mm) from the basic minimum elongation of the following percentage shall be made
48 000 (330) 60 000 (415) 70 000 (485)
30 000 (205) 35 000 (240) 40 000 (275)
Longitudinal Transverse Longitudinal Transverse Longitudinal Transverse
35 25 30 16.5 30 16.5
28 20 22 12 20 12
B.C - B.C - B.C -
- 1.25A - 1.00A - 1.00A
AThe following table gives the computed minimum values:
Wall Thickness Elongation in 2 in. or 50 mm, min, %
in. mm Grade A, Transverse Grades B and C, Transverse
5/16 (0.312) 7.9 25.00 16.50
9/32 (0.281) 7.1 23.75 15.50
1/4 (0.250) 6.4 22.50 14.50
7/32 (0.219) 5.6 ... ...
3/16 (0.188) 4.8 ... ...
1/8 (0.125) 3.2 ... ...
3/32 (0.094) 2.4 ... ...
1/16 (0.062) 1.6 ... ...


Note-The above table gives the computed minimum eiongation values for each 1/32-in. (0.8-mm) decrease in wall thickness. Where the wall thickness lies between two values shown above. the minimum elongation value is determined by the following equation: Grade Direction of Test Equation A Transverse E=40t + 12.50 B and C Transverse E=32t + 6.50

where:
E= elongation in 2 in. or 50 mm, %, and
t= actual thickness of specimen, in.
B The minimum elongation in 2 in. (50.8mm) shall be determined by the following equation:

e=625 000A0.2/u0.9

where:
e= minimum elongation in 2 in. (50.8mm) % rounded to the nearest 0.5%
A= cross-sectional area of the tension test specimen, in 2. based on specified outside diameter of nominal specimen width and specified wall thickness rounded to the nearest 0.01 in.², then the value 0.75 shall be used, and 
U= specified tensile strength. psi.
c See Table 4 for minimum elongation values for various size tension specimens and grades.

Table 4 Elongation Values

Area. in.²A Tension Test Specimen Wall Thickness, in.B Elongation in 2 in, min., Specified Tensile Strength,psi
Grade A Grade B Grade C
½in. Specimen ¾in. Specimen 1in. Specimen ½in. Specimen 48 000 60 000 70 000
≥0.75 ≥1.491 ≥0.994 ≥0.746 ≥0.497 36.0 29.5 25.5
0.74 1.470-1.490 0.980-0.993 0.735-0.745 0.490-0.496 36.0 29.5 25.5
0.73 1.451=1.469 0.967-0.979 0.726-0.734 0.484-0.489 36.0 29.5 25.5
0.72 1.430-1.450 0.954-0.966 0.715-0.725 0.477-0.483 36.0 29.5 25.5
0.71 1.411-1.429 0.941-0.953 0.706-0.714 0.471-0.476 35.5 29.0 25.5
0.70 1.390-1.410 0.927-0.940 0.695-0.705 0.464-0.470 35.5 29.0 25.5
0.69 1.371-1.389 0.914-0.926 0.686-0.694 0.457-0.463 35.5 29.0 25.5
0.68 1.350-1.370 0.900-0.913 0.675-0.685 0.450-0.456 35.5 29.0 25.0
0.67 1.331-1.349 0.887-0.899 0.666-0.674 0.444-0.449 35.5 29.0 25.0
0.66 1.310-1.330 0.874-0.886 0.655-0.665 0.437-0.443 35.0 29.0 25.0
0.65 1.291-1.309 0.861-0.873 0.646-0.654 0.431-0.436 35.0 28.5 25.0
0.64 1.270-1.290 0.847-0.860 0.635-0.645 0.424-0.430 35.0 28.5 25.0
0.63 1.251-1.269 0.834-0.846 0.626-0.634 0.417-0.423 35.0 28.5 25.0
0.62 1.230-1.250 0.820-0.833 0.615-0.625 0.410-0.416 35.0 28.5 25.0
0.61 1.211-1.229 0.807-0.819 0.606-0.614 0.404-0.409 34.5 28.5 24.5
0.60 1.190-1.210 0.794-0.806 0.595-0.605 0.397-0.403 34.5 28.5 24.5
0.59 1.171-1.189 0.781-0.793 0.586-0.594 0.391-0.396 34.5 28.0 24.5
0.58 1.150-1.170 0.767-0.780 0.575-0.585 0.384-0.390 34.5 28.0 24.5
0.57 1.131-1.149 0.754-0.766 0.566-0.574 0.377-0.383 34.0 28.0 24.5
0.56 1.110-1.130 0.740-0.753 0.555-0.565 0.370-0.376 34.0 28.0 24.9
0.55 1.091-1.109 0.727-0.739 0.546-0.554 0.364-0.369 34.0 28.0 24.0
0.54 1.070-1.090 0.714-0.726 0.535-0.545 0.357-0.363 34.0 27.5 24.0
0.53 1.051-1.069 0.701-0.713 0.526-0.534 0.351-0.356 33.5 27.5 24.0
0.52 1.030-1.050 0.687-0.700 0.515-0.525 0.344-0.350 33.5 27.5 24.0
0.51 1.011-1.029 0.674-0.666 0.506-0.514 0.337-0.343 33.5 27.5 23.5
0.50 0.990-1.010 0.660-0.673 0.495-0.505 0.330-0.336 33.5 27.0 23.5
0.49 0.971-0.989 0.647-0.659 0.486-0.494 0.324-0.329 33.0 27.0 23.5
0.48 0.950-0.970 0.634-0.646 0.475-0.485 0.317-0.323 33.0 27.0 23.5
0.47 0.931-0.949 0.621-0.633 0.466-0.474 0.311-0.316 33.0 27.0 23.5
0.46 0.910-0.930 0.607-0.620 0.455-0.465 0.304-0.310 33.0 27.0 23.0
0.45 0.891-0.909 0.594-0.606 0.446-0.454 0.297-0.303 32.5 26.5 23.0
0.44 0.870-0.890 0.580-0.593 0.435-0.445 0.290-0.296 32.5 26.5 23.0
0.43 0.851-0.869 0.567-0.579 0.426-0.434 0.284-0.289 32.5 26.5 23.0
0.42 0.830-0.850 0.554-0.566 0.415-0.425 0.277-0.283 32.0 26.5 23.0
0.41 0.811-0.829 0.541-0.553 0.406-0.414 0.271-0.276 32.0 26.0 22.5
0.40 0.790-0.810 0.527-0.540 0.395-0.405 0.264-0.270 32.0 26.0 22.5
0.39 0.771-0.789 0.514-0.526 0.386-0.394 0.257-0.263 31.5 26.0 22.5
0.38 0.750-0.770 0.500-0.513 0.375-0.385 0.250-0.256 31.5 26.0 22.5
0.37 0.731-0.749 0.487-0.499 0.366-0.374 0.244-0.249 31.5 25.5 22.0
0.36 0.710-0.730 0.474-0.486 0.355-0.365 0.237-0.243 31.0 25.5 22.0
0.35 0.691-0.709 0.461-0.473 0.346-0.354 0.231-0.236 31.0 25.5 22.0
0.34 0.670-0.690 0.447-0.460 0.336-0.345 0.224-0.230 31.0 25.0 22.0
0.33 0.651-0.669 0.434-0.446 0.326-0.334 0.217-0.223 30.5 25.0 21.5
0.32 0.630-0.650 0.420-0.433 0.315-0.325 0.210-0.216 30.5 25.0 21.5
0.31 0.611-0.629 0.407-0.419 0.306-0.314 0.204-0.209 30.5 25.0 21.5
0.30 0.590-0.610 0.394-0.406 0.295-0.305 0.197-0.203 30.0 24.5 21.5
0.29 0.571-0.589 0.381-0.393 0.286-0.294 0.191-0.196 30.0 24.5 21.0
0.28 0.550-0.570 0.367-0.380 0.275-0.285 0.184-0.190 29.5 24.5 21.0
0.27 0.531-0.549 0.354-0.366 0.266-0.274 0.177-0.183 29.5 24.0 21.0
0.26 0.510-0.530 0.340-0.353 0.2555-0.265 0.170-0.176 29.0 24.0 20.5
0.25 0.491-0.509 0.327-0.339 0.246-0.254 0.164-0.169 29.0 23.5 20.5
0.24 0.470-0.490 0.314-0.326 0.235-0.245 0.157-0.163 29.0 23.5 20.5
0.23 0.451-0.469 0.301-0.313 0.226-0.234 0.151-0.156 28.5 23.5 20.0
0.22 0.430-0.450 0.287-0.300 0.215-0.225 0.144-0.150 28.5 23.0 20.0
0.21 0.411-0.429 0.274-0.286 0.206-0.214 0.137-0.143 28.0 23.0 19.5
0.20 0.390-0.410 0.260-0.273 0.195-0.205 0.130-0.136 27.5 22.5 19.5
0.19 0.371-0.389 0.247-0.259 0.186-0.194 0.124-0.129 27.5 22.5 19.5
0.18 0.350-0.370 0.234-0.246 0.175-0.185 0.117-0.123 27.0 22.0 19.0
0.17 0.331-0.349 0.221-0.233 0.166-0.174 0.111-0.116 27.0 22.0 19.0
0.16 0.310-0.330 0.207-0.220 0.155-0.165 0.104-0.110 26.5 21.5 18.5
0.15 0.291-0.309 0.194-0.260 0.146-0.154 0.097-0.103 26.0 21.5 18.5
0.14 0.270-0.290 0.180-0.193 0.135-0.145 0.091-0.096 26.0 21.0 18.0
0.13 0.251-0.269 0.167-0.179 0.126-0.134 0.084-0.090 25.5 21.0 18.0
0.12 0.230-0.250 0.154-0.166 0.115-0.125 0.077-0.083 25.0 20.5 17.5
0.11 0.211-0.229 0.141-0.153 0.106-0.114 0.071-0.076 24.5 20.0 17.0
0.10 0.190-0.210 0.127-0.140 0.095-0.105 0.064-0.070 24.0 19.5 17.0
0.09 0.171-0.189 0.114-0.126 0.086-0.094 0.057-0.063 23.5 19.5 16.5
0.08 0.150-0.170 0.100-0.113 0.075-0.085 0.050-0.056 23.0 19.0 16.0
0.07 0.131-0.149 0.087-0.099 0.066-0.074 0.044-0.049 22.5 18.5 15.5
0.06 0.110-0.130 0.074-0.086 0.055-0.065 0.037-0.043 22.0 18.0 15.0
0.05 0.091-0.109 0.061-0.073 0.046-0.054 0.031-0.036 21.0 17.0 15.0
0.04 0.070-0.090 0.047-0.060 0.035-0.045 0.024-0.030 20.0 16.5 14.5
0.03 0.051-0.069 0.034-0.046 0.026-0.034 0.017-0.023 19.0 15.5 13.5
0.02 0.030-0.050 0.020-0.033 0.015-0.025 0.010-0.016 17.5 14.5 12.5
≤0.01 ≤0.029 ≤0.019 ≤0.014 ≤0.009 15.0 12.5 11.0

A1 in.²= 645.16mm².      B 1 in.= 25.4mm.

Table 5 Variation in OutsideDiameter

NPS Designator PermissibleVarriations in Outside Diameter
Over Under
in. mm in. mm
1/6 to 1 1/2, incl 1/64 (0.015) 0.40 1/64(0.015) 0.40
Over 11/2 to 4. incl 1/32 (0.031) 0.79 1/32(0.031) 0.79
Over 4 to 8, incl 1/16 (0.062) 1.59 1/32(0.031) 0.79
Over 8 to 18, incl 3/32 (0.093) 2.38 1/32(0.031) 0.79
Over 18 to 26 incl 1/8 (0.125) 3.18 1/32(0.031) 0.79
Over 26 to 34, inc 5/32 (0.156) 3.97 1/32(0.031) 0.79
Ovel 34 to 48, incl 3/16 (0.187) 4.76 1/32(0.031) 0.79

 

TABLE 6 Marking

Hydro NDE Marking
Yes No NDE
No No NH
Yes Yes Test Pressure/NDE

APPENDIXES
(Nonmandatory Information)
X1. CALCULATED H VAKYES FIR SEANKESS OUOE

X1.1 Table X 1.1 lists values for H to be used for the test of Section 11. 
Table X1.1 Calculated "h" Values for Seamless Pipe

Inch-Pound Units
NPS Designator Out side Diameter, in. Wall Thickness, in. Schedule Number Distance, in inches, Between Plates "H" by Equation:
H=-(1+e)t/e+t/D
NPS Designator Outside Diameter, in. Wall Thickness, in. Schedule Number Distance, in inches, Between Plates "H" by Equation:
H=-(1+e)t/e+t/D
Grade A Grade B&C Grade A Grade B&C
2 1/2 2.875 0.203 40 1.456 4.545 14 14.000 0.250 10 2.759 3.045
- - 0.276 80 1.694 1.779 - - 0.312 20 3.294 3.617
- - 0.375 160 1.925 2.002 - - 0.375 30 3.792 4.146
- - - - - - - - 0.438 40 4.669 5.125
3 3.500 0.216 40 1.646 1.755 - - 0.593 60 5.234 5.647
- - 0.300 80 1.955 2.062 - - 0.750 80 6.064 6.494
- - 0.438 160 2.306 2.398 - - 0.937 100 6.887 7.322
- - - - - - - - 1.093 120 7.479 7.902
3 /12 4.000 0.226 40 1.788 1.912 - - 1.250 140 7.974 8.397
- - 0.318 80 2.153 2.276 - - 1.406 160 8.416 8.827
- - - - - - - - - - - -
4 4.500 0.237 40 1.929 2.067 - 16.000 0.250 10 2.284 3.124
- - 0.337 80 2.350 2.489 16 - 0.312 20 3.387 3.730
- - 0.438 120 2.687 2.818 - - 0.375 30 3.915 4.294
- - 0.531 160 2.896 3.022 - - 0.500 40 4.854 5.284
- - - - - - - - 0.656 60 5.855 6.324
5 5.563 0.258 40 2.205 2.372 - - 0.843 80 6.861 7.352
- - 0.375 80 2.747 2.920 - - 1.031 100 7.709 8.206
- - 0.500 120 3.179 3.346 - - 1.218 120 8.426 8.919
- - 0.625 160 3.509 3.667 - - 1.438 140 9.141 9.625
- - - - - - - - 1.593 160 9.579 10.050
6 6.625 0.280 40 2.473 2.669 - - - - - -
- - 0.432 80 3.213 3.419 18 18.000 0.250 10 2.876 3.189
- - 0.562 120 3.682 3.884 - - 0.312 20 3.462 3.823
- - 0.719 160 4.116 4.307 - - 0.438 30 4.535 4.963
- - - - - - - - 0.562 40 5.457 5.941
8 8.625 0.250 20 2.477 2.702 - - 0.750 60 6.656 7.185
- - 0.277 30 2.668 2.902 - - 0.937 80 7.663 8.214
- - 0.322 40 2.964 3.210 - - 1.156 100 8.657 9.216
- - 0.406 60 3.451 3.711 - - 1.375 120 9.495 10.043
- - 0.500 80 3.914 4.181 - - 1.562 140 10.115 10.660
- - 0.593 100 4.305 4.573 - - 1.781 160 10.665 11.198
- - 0.719 120 4.750 5.013 - - - - - -
- - 0.812 140 5.036 5.293 20 20.000 0.250 10 2.919 3.242
- - 0.906 160 5.288 5.538 - - 0.375 20 4.101 4.521
- - - - - - - - 0.500 30 5.143 5.632
10 10.750 0.250 20 2.615 2.868 - - 0.593 40 5.841 6.367
- - 0.307 30 3.054 3.333 - - 0.812 60 7.272 7.856
- - 0.365 40 3.459 3.757 - - 1.031 80 8.464 9.072
- - 0.500 60 4.268 4.592 - - 1.281 100 9.601 10.221
- - 0.593 80 4.738 5.070 - - 1.500 120 10.452 11.069
- - 0.719 100 5.320 5.621 - - 1.750 140 11.284 11.889
- - 0.843 120 5.747 6.077 - - 1.968 160 11.913 12.504
- - 1.000 140 6.242 6.564 - - - - - -
- - 1.125 160 6.580 6.892 24 24.000 0.250 10 2.986 3.326
- - - - - - - - 0.375 20 4.236 4.686
12 12.750 0.250 20 2.711 2.985 - - 0.562 30 5.869 6.437
- - 0.330 30 3.366 3.683 - - 0.687 40 6.831 7.454
- - 0.406 40 3.921 4.266 - - 0.968 60 8.690 9.390
- - 0.562 60 4.892 5.271 - - 1.218 80 10.061 10.793
- - 0.687 80 5.542 5.934 - - 1.531 100 11.449 12.244
- - 0.843 100 6.231 6.627 - - 1.812 120 12.585 13.332
- - 1.000 120 6.817 7.209 - - 2.062 140 13.424 14.150
- - 1.125 140 7.222 7.607 - - 2.343 160 14.248 14.958
- - 1.312 160 7.747 8.119 - - - - - -

TABLE X1.1 Calculated "H" Values for Seamless Pipe
Continued

Si Units
NPS Designator Out side Diameter, in. Wall Thickness, in. Schedule Number Distance, in inches, Between Plates "H" by Equation:
H=-(1+e)t/e+t/D
NPS Designator Outside Diameter, in. Wall Thickness, in. Schedule Number Distance, in inches, Between Plates "H" by Equation:
H=-(1+e)t/e+t/D
Grade A Grade B&C Grade A Grade B&C
2 1/2 73.0 5.16 40 37.0 39.2 14 355.6 6.35 10 70.1 77.3
- - 7.01 80 43.0 45.2 - - 7.92 20 83.7 91.8
- - 9.52 160 48.9 50.8 - - 9.52 30 96.3 105.3
- - - - - - - - 11.13 40 118.6 130.2
3 88.9 5.49 40 41.8 44.6 - - 15.06 60 132.9 143.4
- - 7.62 80 49.6 52.4 - - 19.05 80 154.0 165.0
- - 11.13 160 58.6 60.9 - - 23.80 100 174.9 186.0
- - - - - - - - 27.76 120 190.0 200.7
3 1/2 101.6 5.74 40 45.4 48.6 - - 31.75 140 202.5 213.3
- - 8.08 80 54.7 57.8 - - 35.71 160 213.8 224.2
- - - - - - - - - - - -
4 114.3 6.02 40 49.0 52.5 16 406.4 6.35 10 71.7 79.4
- - 8.56 80 59.7 63.2 - - 7.92 20 89.0 94.7
- - 11.13 120 67.0 71.6 - - 9.52 30 99.4 109.1
- - 13.49 160 73.6 76.8 - - 12.70 40 123.3 143.2
- - - - - - - - 16.66 60 148.7 160.6
5 141.3 6.55 40 56.0 60.2 - - 21.41 80 174.3 186.7
- - 9.52 80 69.8 74.2 - - 26.19 100 195.8 208.4
- - 12.70 120 80.8 85.0 - - 30.94 120 214.0 226.6
- - 15.88 160 89.1 93.1 - - 36.53 140 232.2 244.5
- - - - - - - - 40.46 160 243.3 255.3
6 168.3 7.11 40 62.8 67.8 - - - - - -
- - 10.97 80 81.6 86.8 18 457.2 6.35 10 73.0 81.0
- - 14.27 120 93.5 98.6 - - 7.92 20 87.9 97.1
- - 18.24 160 104.6 109.4 - - 11.13 30 115.2 126.1
- - - - - - - - 14.27 40 139.5 150.9
8 219.1 6.35 20 63.0 68.6 - - 19.05 60 169.1 182.5
- - 7.04 30 67.8 73.7 - - 23.80 80 194.6 208.6
- - 8.18 40 75.3 81.5 - - 29.36 100 219.9 234.1
- - 10.31 60 87.7 94.3 - - 34.92 120 241.2 255.1
- - 12.70 80 99.4 106.2 - - 39.67 140 256.9 270.7
- - 15.06 100 109.4 116.2 - - 45.24 160 270.9 284.4
- - 18.24 120 120.6 127.3 - - - - - -
- - 20.62 140 127.9 134.4 20 508.0 6.35 10 74.1 82.4
- - 23.01 160 134.3 140.7 - - 9.52 20 104.2 114.8
- - - - - - - - 12.70 30 130.6 143.0
10 273.0 6.35 20 66.4 72.8 - - 15.06 40 148.4 161.7
- - 7.80 30 77.6 84.7 - - 20.62 60 148.7 199.5
- - 9.27 40 87.9 95.4 - - 26.19 80 215.0 230.4
- - 12.70 60 108.4 116.6 - - 32.54 100 243.9 259.6
- - 15.06 80 120.4 128.8 - - 38.10 120 265.5 281.2
- - 18.24 100 135.1 142.8 - - 44.45 140 286.6 302.0
- - 21.41 120 146.0 154.4 - - 49.99 160 302.6 317.6
- - 25.40 140 158.6 166.7 - - - - - -
- - 28.58 160 167.1 175.1 24 609.6 6.35 10 75.8 84.5
- - - - - - - - 9.52 20 107.6 119.0
12 323.8 6.35 20 68.9 75.8 - - 14.72 30 149.1 163.5
- - 8.38 30 85.5 93.6 - - 17.35 40 173.5 189.3
- - 10.31 40 99.6 108.4 - - 24.59 60 220.7 238.5
- - 14.27 60 124.3 133.9 - - 30.94 80 255.6 274.1
- - 17.35 80 140.8 150.7 - - 38.89 100 290.8 311.0
- - 21.41 100 158.3 168.3 - - 46.02 120 319.7 338.6
- - 25.40 120 173.2 183.1 - - 52.37 140 341.0 359.4
- - 28.58 140 183.4 193.2 - - 59.51 160 361.9 379.9
- - 33.32 160 196.8 206.2 - - - - - -

X2 MINIMUM WALLTHICKNESSES

X2.1 Table X2.1 lists minimum wall thicknesses for nominal pipe wall thickness.

TABLE X2.1 Table of Minimum Wall Thickness on inspection for Nominal (Average) Pipe Wall Thckness

Note 1-The following equation, upon which this table is based, may be applied to calcalate minimum wall thickness from nominal (average) wall thickness:
tn X 0.875 = tm

where
tn=nominal (average) wall thickness, in. and 
tm=minimum wall thickness,in. 

The wall thickness is expressed to three decimal places, the fourth decimal place being carried forward or dropped, in accordance with Practive E 29.


Note 2-This table covers some wall thicknesses associated with standard pipe sizes but is not meant to imply that these are the only thicknesses obtainable under this specification.

Nominal
(Average)
Thickness(tn)
Minimum
Thickness
on inspection(tm)
Nominal
(Average)
Thickness(tn)
Minimum
Thickness
on inspection(tm)
Nominal
(Average)
Thickness(tn)
Minimum
Thickness
on inspection(tm)
in. mm in. mm in. mm in. mm in. mm in. mm
0.068 1.73 0.60 1.52 0.281 7.14 0.246 6.25 0.864 21.94 0.756 19.20
0.083 2.11 0.73 1.85 0.294 7.47 0.257 6.53 0.875 22.22 0.766 19.46
0.088 2.24 0.77 1.96 0.300 7.62 0.262 6.65 0.906 23.01 0.793 20.14
0.091 2.31 0.80 2.03 0.307 7.80 0.269 6.83 0.938 23.82 0.821 20.85
0.095 2.41 0.83 2.11 0.308 7.82 0.270 6.86 0.968 24.59 0.847 21.51
0.109 2.77 0.95 2.41 0.312 7.92 0.273 6.93 1.000 25.40 0.875 22.22
0.113 2.87 0.99 2.51 0.318 8.07 0.278 7.06 1.031 26.19 0.902 22.91
0.119 3.02 0.104 2.64 0.322 8.18 0.282 7.16 1.062 26.97 0.929 23.60
0.125 3.18 0.109 2.77 0.330 8.38 0.289 7.34 1.094 27.79 0.957 24.31
0.126 3.20 0.110 2.79 0.337 8.56 0.295 7.49 1.125 28.58 0.984 24.99
0.133 3.38 0.116 2.95 0.344 8.74 0.301 7.64 1.156 29.36 1.012 25.70
0.140 3.56 0.122 3.10 0.358 9.09 0.313 7.95 1.219 30.96 1.066 27.08
0.141 3.58 0.123 3.12 0.365 9.27 0.319 8.10 1.250 31.75 1.094 27.79
0.145 3.68 0.127 3.23 0.375 9.52 0.328 8.33 1.281 32.54 1.121 28.47
0.147 3.76 0.129 3.28 0.382 9.70 0.334 8.48 1.312 33.32 1.148 29.16
0.154 3.91 0.135 3.43 0.400 10.16 0.350 8.89 1.375 34.92 1.203 30.56
0.156 3.96 0.136 3.45 0.406 10.31 0.355 9.02 1.406 35.71 1.230 31.24
0.172 4.37 0.150 3.81 0.432 10.97 0.378 9.60 1.438 36.53 1.258 31.95
0.179 4.55 0.157 3.99 0.436 11.07 0.382 9.70 1.500 38.10 1.312 33.32
0.188 4.78 0.164 4.17 0.438 11.12 0.383 9.73 1.531 38.89 1.340 34.04
0.191 4.85 0.167 4.24 0.469 11.91 0.410 10.41 1.562 39.67 1.367 34.72
0.200 5.08 0.175 4.44 0.500 12.70 0.438 11.13 1.594 40.49 1.395 35.43
0.203 5.16 0.178 4.52 0.531 13.49 0.465 11.81 1.635 41.35 1.431 36.35
0.210 5.33 0.184 4.67 0.552 14.02 0.483 12.27 1.750 44.45 1.531 38.89
0.216 5.49 0.189 4.80 0.562 14.27 0.492 12.50 1.781 45.24 1.558 39.57
0.218 5.54 0.191 4.85 0.594 15.09 0.520 13.21 1.812 46.02 1.586 40.28
0.219 5.56 0.192 4.88 0.600 15.24 0.525 13.34 1.875 47.62 1.641 41.68
0.226 5.74 0.198 5.03 0.625 15.88 0.547 13.89 1.969 50.01 1.723 43.76
0.237 6.02 0.207 5.26 0.656 16.66 0.574 14.58 2.000 50.08 1.750 44.45
0.250 6.35 0.219 5.56 0.674 17.12 0.590 14.99 2.062 52.37 1.804 45.82
0.258 6.55 0.226 5.74 0.688 17.48 0.602 15.29 2.125 53.98 1.859 47.22
0.276 7.01 0.242 6.15 0.719 18.26 0.629 15.98 2.200 55.88 1.925 48.90
0.277 7.04 0.242 6.15 0.750 19.05 0.656 16.66 2.344 59.54 2.051 52.10
0.279 7.09 0.244 6.19 0.812 20.62 0.710 18.03 2.500 63.50 2.188 55.58
0.280 7.11 0.245 6.22 0.844 21.44 0.739 18.77 - - - -

Material Comparison Tables (ASTM ¡æKS, JIS, DIN, BS, NBN, NF, UNI) 

ASTM
STANDARD
UNS NO.
KOREA/JAPANES

GERMAN

BRITISH
BELGIAN
FRENCH
ITALIAN
KS/JIS Symbol
KS/JIS Numbe
Re marks
DIN Type

DIN
No.

Materiral
No.

Re marks

B.S
No.

B.S Grade
Re marks
NBN Type
NBN Grade
Re marks
AFNOR Type
NF No.
Re marks
UNI Type
UNI No.
Re marks

A 106

Seamless C-Steel Pipe for High Temperature Service

Grade A K02501 SPHT 38 / STPT 370 D3570 / G3456 (16)(30) St 35.8 17175 1.0305 3602 HFS 360 D 37-2 629 (3b)(9) TU 37C A49-213 C 14 5462
Grade B K03006 SPHT 42 / STPT 410 D3570 / G3456 (16)(30) St 45.8 17175 1.0405 3602 HFS 410 D 42-2 629 (3b)(9) TU 42C A49-213 C 18 5462



JIS Number and Corrensponding Foreign Standards

JIS
ASTM
BS
DIN
NF
ISO

Index No.

Std.No

Grade

Type

Std.No

Grade

Type

Std.No

Grade

Type

Std.No

Grade

Type

Std.No

Grade

Type

Std.No

Grade

Type

G3456

STPT370
(STPT38)

C
A106
GrA
C
3602
HFS360
C
17175
St35.8
C
A49-211
TU37b
C
2604/2
TS5
C
C004
"
CFS360
C
17177
St37.8
C
A49-213
TU37c
C
2604/3
TW9H
C
"
ERW360
C
A49-243
TU37c
C
"
CEW360
C

STPT410
(STPT42)

 

C
A106
GrB
C
3602
HFS410
C
17175
St45.8
C
A49-211
TU42b
C
2604/2
TS9H
C
"
CFS410
C
17177
St42.8
C
A49-213
TU42c
C
"
ERW410
C
A49-243
TU42c
C
"
CEEW410
C

STPT480
(STPT42)

C
A106
GrC
C
3602
HFS460
C
A49-211
TU48b
C
2604/2
TS14
C
"
CFS460
C
A49-213
TU48c
C
"
ERW460
C
"
CEEW460
C

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