This standard² is issued under the fixed designation A 556/A 556M; 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.

1.Scope

1.1 This specification covers minimum-wall-thickness, seamless cold-drawn carbon steel tubes including bending into the from of u-tubes, if specified, for use in tubular feedwater heaters.

1.2 The tubing sizes covered shall be 5/8 to 1 2/4-in. [15.9 to 31.8-mm] outside diameter, inclusive, with minimum wall thicknesses equal to or greater than 0.045 in. [1.1 mm].

1.3 optional supplementary requirements are provided, and hen desired, shall be stated in the order.

1.4 The values stared in either inch-pound units or SI units are to be regarded separately as the standard. within the text, the SI units are shown in brackets. The values sated in each system are not exact equivalents; therefore, each system must be 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 specification is specified in the order.

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