This specification covers hot-rolled carbon steel sheet for pressure vessels involving fusion welding or brazing. Tensile and yield strengths shall be determined after a tension test of the sheets. The material shall be furnished without removing the hot-rolled oxide or scale. When required, the material may be specified to be pickled or blast cleaned. When specified to be pickled or blast cleaned, the material shall be furnished oiled. When required, pickled or blast-cleaned material may be specified to be furnished dry.

1.1 This specification2 covers hot-rolled carbon steel sheet for pressure vessels involving fusion welding or brazing. Welding and brazing technique is of fundamental importance and shall be in accordance with commercial practices.

1.2 The following grades are included in this specification:

Mechanical Requirements

Yield Strength, min

Tensile Strength, min

Grade

ksi

MPa

ksi

MPa

A

25

170

45

310

B

30

205

50

345

C

33

230

55

380

D

35

240

60

415

E

38

260

65

450

F

42

290

70

485

G

45

310

75

515

H

45

310

75

515

1.3 Hot-rolled carbon steel sheet is generally furnished in cut lengths and to decimal thickness only. Coils may be furnished, provided tension test specimens are taken to represent the front end, middle, and back end of the slab as required by the mechanical property requirements in section 6.1, for Tensile Strength. The purchaser should recognize this may require cutting the coils to obtain test samples and results in half-size coils. The sheet shall be furnished to the following size limits:

Width, in. [mm]

Thickness, in. [mm]

Over 12 [Over 300]

0.270 to 0.230 [7.0 to 6.0]

 sheet (coils only)

Under 0.230 to 0.057 [6.0 to 1.5]

 sheet

1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

1.5 Tolerances are found in General Requirements Specifications A568/A568M and A635/A635M. The appropriate General Requirements specification is applied based on the thickness and width of the product ordered.

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.