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ASTM A161 / ASME SA161/ Seamless Low Carbon And Cardon Molybdenum Steel Still Tubes For Refinery Service supplier & distributor in India

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ASTM A161 / ASME SA 161 

Seamless Low Carbon and Carbon-Molybdenum 

Steel Tubes for Refinery Service

This standard is issued under the fixed designation A 161; 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 minimum-wall-thickness, seamless, hot-finished and cold-finished, low-carbon and carbon-molybdenum steel still tubes, for use in carrying fluids at elevated temperatures and pressures in various types of heaters, in which the tubes may be subjected to furnace temperature higher than that of the contained fluid.

1.2 This specification covers tubes 2 to 9 in. (50.8 to 228.6 mm), inclusive in outside diameter and over 0.220 in. (5.59 mm) in minimum wall thickness.

1.3 Where butt welding is used to obtain lengths longer than single lengths normally produced in the mill, Specification A 422 shall cover the requirements for butt welds.

1.4 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are for information only.

Chemical composition

Grade
Mfg. Process Chemical composition(%)
C
Si
Mn
P
S
Ni
Cr
Mo
Other
Low-Carbon
S
0.10~0.20
0.25Max
0.30~0.80
0.048Max
0.058Max
-
-
-
-
Gr. T1
S
0.10`0.20
0.10~0.50
0.30~0.80
0.045Max
0.045Max
-
-
0.44~0.65
-

  Mechanical Properties 

Grade
Tensile Test MPa or N/mm2
Remaks (Similar to JIS)
Possibility Temperature
Min Yield point Tensile Strength
Low-Carbon
179
324Min
(STB340)
Gr. T1
207
379Min
(STFA12)


TABLE 1 Chemical Requirements Brinel

Element
Composition, %
Low-Carbon Steel Tubes
Grade T1
Carbon
0.10-0.20
0.10-0.20
Manganese
0.30-0.80
0.30-0.80
Phosphorus, max
0.035
0.025
Sulfur, max
0.035
0.025
Silicon
0.25 max
0.10-0.50
Molybdenum
...
0.44-0.65

Hardness Number

Low-Carbon Steel Tubes
Steel Tubes
Grade T1
Hot-rolled tubes
137
150
Cold-finished tubes
125
137




TABLE 2 Tensile Requirements

-
Low-Carbon Steel Tubes
Grade T1
Tensile strength, min, psi (MPa)
Yield strength, min, psi(MPa) Elongation in 2 in. or 50 mm(or 4D), min, %
Basic minimum elongation for walls 5/16 in. (7.9 mm) and over in thickness
When standard round tension test specimen with 2-in. or 50-mm gage length or smaller proportionally sized specimen with the gage length equal to 4D (4 times the diameter) is used
For longitudinal strip tests, a deduction shall be made 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
47 (324)
55 (379)
26 (179)
30 (207)
35
30
28
22
1.75A
1.50A
AThe following table gives the computed minimum values:
Wall Thickness
Elongation in 2 in. (50 mm), min, %
in. (mm)
Low-Carbon steel Tubes
GradeT1
5/16 (0.312) 7.94
35
30
9/32 (0.281) 7.14
33
28
1/4 (0.250) 6.35
32
27
7/32 (0.219) 5.56
30
26
3/16 (0.188) 4.76
28
24
5/32 (0.156) 3.97
26
22
1/8 (0.125) 3.18
25
21
3/32 (0.094) 2.38
23
20
1/16 (0.062) 1.59
21
18

Note-The above table gives the computed minimum eiongation values for each 1/32-in. (0.79-mm) decrease in wall thickness. Where the wall thickness lies between two vallues shown above. the minimum elongation value is determined by the following equation: 

Grade
Equation
Low-Carbon Steel Tubes
E = 56t + 17.50
T1
E = 48t + 15.00


where: E = elongation in 2 in., %, and
t = actual thickness of spectimen, in.
BCalculated elongation requirements shall be rounded to the nearest whole number.TABLE 3 Plug Gage Dimensions for Tubes with Plain Ends 

Note-A plug gage 4 in. in length, with a diameter determined by the proper equation prescribed in this table, 
shall enter each end of each tube for a distance of 4 in.

Outside Diameter, in. (mm)
Hot-Rolled Still Tubes
Cold-Finished Still Tubes
EquationsA
EquationsA
Inch-pound Units, in
4 and under
PG = D - (2t/0.875) - 0.077
PG = D - (2t/0.90) - 0.0625
Over 4 to 7 1/2, incl
PG = D - (2t/0.875) - 0.120
PG = D - (2t/0.90) - 0.080
Over 7 1/2 to 9, incl
PG = D - (2t/0.875) - 0.115
PG = D - (2t/0.90) - 0.090
Sl Units, mm
102 and under
PG = D - (2t/0.875) - 1.96
PG = D - (2t/0.875) - 1.59
Over 102 to 191, incl
PG = D - (2t/0.875) - 2.59
PG = D - (2t/0.875) - 2.03
Over 191 to 229, incl
PG = D - (2t/0.875) - 2.92
PG = D - (2t/0.875) - 2.29


AExpressions used in equation are as follows:
PG = diameter of plug gage, in. (mm),
D = specified outside diameter of tube, in. (mm), and
t = specified thickness of tube wall, in. (mm).

TABLE 4 Plug gage Dimensions for Tubes with Internal Upset Ends

Note-For tubes that are upset at the ends, a "go" plug gage with a diameter determined by the appropriate 
equation given in the table shall enter each upset end the full length of the upset.
A "no-go" plug gage using the same equation without the clearance allowance shall not enter the tube.

Specified Length of Upset, in. (mm)B
Hot-Rolled Still Tubes
Cold-Finished Still Tubes
EquationsA
EquationsA
Inch-pound Units, in
3 and under
PG = D - 2[(t/(0.875) + U] - 0.093
PG = D - 2[(t/(0.90) + U] - 0.093
Over 3 to 4, incl
PG = D - 2[(t/(0.875) + U] - 0.113
PG = D - 2[(t/(0.90) + U] - 0.113
Over 4 to 5, incl
PG = D - 2[(t/(0.875) + U] - 0.133
PG = D - 2[(t/(0.90) + U] - 0.133
Sl Units, mm
76 and under
PG = D - 2[(t/(0.875) + U] - 2.36
PG = D - 2[(t/(0.90) + U] - 2.36
Over 76 to 102, incl
PG = D - 2[(t/(0.875) + U] - 2.87
PG = D - 2[(t/(0.90) + U] - 2.87
Over 102 to 127, incl
PG = D - 2[(t/(0.875) + U] - 3.38
PG = D - 2[(t/(0.90) + U] - 3.38

AExpressions used in equation are as follows:
PG = diameter of plug gage, in. (mm),
D = specified outside diameter of tube, in. (mm), and
t = specified thickness of tube wall, in. (mm).
U = increase in tube wall thickness at upset end, in. (mm).
B Specified length of full upset is minimu.



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
Number
Materiral
Number
Re
marks
B.SNumber B.S Grade Re
marks
NBN Type NBN Grade Re
marks
AFNOR Type NF Number Remarks UNI Type UNI Number Re
marks
A 161Seamless Low-C and C-Mo Steel Still Tubes for RefineryService Carbon Steel                                        
K01504 STF 410 / STF 410 D3587 / G3467 (31) St 35.8 17175 1.0305   3056 HFS 320 (31) D 37.1 629 (3b) C 10 d   (3a) C 14 5462 (3b)
K11522 SFTA12 / STFA12 D3578 / G3467 (34) 16 Mo 5   1.5423 (3a)     (3) 16 Mo 5 629 (3b) 15 D 5   (3a) 16 Mo 5 5462 (3b)
Grade T1                                        


IS Number and Corrensponding Foreign Standards

JIS ASTM BS DIN NF ISO Index Number
Standard Number Grade Tupe Standard Number Grade Tupe Standard Number Grade Tupe Standard Number Grade Tupe Standard Number Grade Tupe Standard Number Grade Tupe
G3461 STB340 C A161 LC C 3059 HFS320 C       A49-245 TS34e C       C010
  (STB35)   A192 - C " CFS320 C       " TS34c C        
      A226 - C " ERW320 C                    
      A556 GrA2 C " CEW320 C                    
      A557 GrA2 C " S1 360 C                    
            " S2 360 C                    
            " ERW 360 C                    
            " CEW360 C                    
            3606 ERW320 C                    
            " CEW320 C                    
            " CFS320 C                    
  STB410 C A179 GrC C 3059 S1 440 C 17175 St45.8 C A49-213 TU42c C 2604/2 TS9H C  
  (STB42)   A210 GrA1 C " S2 440 C 17177 St42.8 C A49-215 TU42c C " TW9H C  
      A556 GrB2 C " ERW 440 C       A49-243 TS42c          
      A557 GrB2 C " CEW 440 C       A49-245 TS42c          
            3602 HFS 410 C       " TS42c          
            " CFS 410 C                    
            " ERW 410 C                    
            " CEW 410 C                    
            3606 ERW 440 C                    
            " CEW 440 C                    
            " CFS 440 C                    
STB510 C             C 17175 19Mn5 C A49-213 TU52C C 2604/2 TS18 C  
(STB52)               C       A49-248 TU52C C        

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