SA-266 Grade 1\2\3\4

SA 266 Specification for carbon steel forgings for pressure vessel components.

 

Chemical requirements

 

ELEMENTS

COMPOSITION, %

Grade 1 & 2

Grade 3

Grade 4

C

0.300.350.30

Mn

0.40-1.050.80-1.350.80-1.35

P

0.0250.025

0.025

S0.0250.025

0.025

Si0.15-0.350.35

0.15-0.35

 

Mechanical properties

Grade 1 & 2

Grade 3Grade 4
Tensile strength, min. Mpa415-585485-655

515-690

Yield strength, min. Mpa

205250260
Elongation in. 2 or 50 mm, min, %2320

19

Reduction of area, min. %

3833

30