Standard ASTM A178 Standard for Welded Carbon Steel Tubes

covers minimum-wall-thickness, electric-resistance-welded tubes made of carbon steel and carbon-manganese steel intended for use as boiler tubes, boiler flues, superheater flues, and safe ends. Type Cand D tubes are not suitable for safe-ending for forge welding.

The tubing sizes and thickness usually furnished to this specification are 1/2 to 5 in. [12.7 to 127 mm] in outside diameter and 0.035 to 0.320 in. [0.9 to 8.1 mm], inclusive, in minimum wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.

Mechanical properties requirements do not apply to tubing smaller than 1/8 in. [3.2 mm[ in inside diameter or 0.015 in. [0.4 mm] in thickness. When these products are to be used in applications conforming to ISO Recommendations for Boiler Construction the requirements of A520 shall supplement and supersede the requirements of this specification.

The values stated in either inch-pound units or SI units are to be regarded separately as standard. W within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must b used independently of the other. Combining values from the two systems may result in nonconformance with the specification. The inch-pound units shall apply unless the “M” designation of this specified in the order.

 

Material Comparison Table ( ℃KS, JIS, DIN, BS, NBN, NF, UNI)

ASTM
UNS NO.
KOREA/JAPANES

GERMAN

BRITISH
BELGIAN
FRENCH
KS/JIS Symbol
KS/JIS
Re
DIN Type

DIN

No.

Re

B.S

B.S Grade
 
NBN Type
NBN Grade
Re
AFNOR Type
NF

A 178

C-Steel Electric-Resistance Welded Boiler Tubes

 
Graade A K01200 STBH 340 / STB 35 D3563 / G3461 St 37.8 17177

1.0315

(7) 3059 ERW 320  
Grade c K03503 SHBH 410 / STB 42 D3563 / G3461 St 42.8 17177 1.0498 (7)  

JIS Number and Corrensponding Foreign Standard

JIS
ASTM
BS
DIN
NF
ISO

No.

Grade

T

No.

Grade

T

No.

Grade

T

No.

Grade

T

No.

Grade

T

No.

Grade

G3461
STB340
C
A161
LC
C
3059
HFS320
C
A49-245
TS34e
C
(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
(STB42)
A210
GrA1
C
S2 440
C
17177
St42.8
C
A49-215
TU42c
C
TW9H
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
(STB52)
C
A49-248
TU52C
C
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