This standard is issued under the fixed designation A 178/A 178M; 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 ( ュ) 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 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.

NOTE 1 Α Type Cand D tubes are not suitable for safe-ending for forge welding.

1.2 The tubing sizes and thicknesses 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.
1.3 Mechanical property 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.
1.4 When these products are to be used in applications conforming to ISO Recommendations for Boiler Construction the requirements of this Specification A 520 shall supplement and supersede the requirements of this specification.
1.5 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 Tables (ASTM ℃KS, JIS, DIN, BS, NBN, NF, UNI)

ASTM STANDARD

UNS NO.

KOREA/JAPANES

GERMAN

BRITISH

BELGIAN

FRENCH

ITALIAN

KS/JIS Symbol

KS/JIS Numbe

Remarks

DIN Type

DIN Number

Materiral Number

Remarks

B.S Number

B.S Grade

NBN Type

NBN Grade

Remarks

AFNOR Type

NF Number

Ramarks

UNI Type

UNI Number

Ramarks

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

(3)

(3)

Grade c

K03503

SHBH 410 / STB 42

D3563 / G3461

St 42.8

17177

1.0498

(7)

(3)

(3)

JIS 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