GENERAL SCOPE

ASTM A320 Grade L7 / ASTM A193 B7 is a material specification chromium-molybdenum steel, used for manufacturing of bolts, studs, stud bolts and other fasteners for bolting pressure vessels, valves, flanges, and fittings for various process industries across major industrial sectors in low temperature applications services.

CHEMICAL COMPOSITION

 

C

Si

Mn

P

S

Cr

Mo

Cu

Ni

Min

0.39

0.15

0.75

 

 

0.80

0.15

 

 

Max

0.43

0.35

1.00

0.03

0.03

1.10

0.25

0.35

0.25

MECHANICAL PROPERTIES

Tensile

Result

RP 0.2%

105,000 PSI MIN

RM

>125,000 PSI MIN

% Elongation

16%

Reduction of Area

50%

HBW10/3000

255-321 BHN

KCV @ -101 DEG C ⌀ 4” <

27J MIN AVE, 20J MIN SINGLE VALUE

 

SURFACE CONDITION                        Peeled / Smooth Turned Bar.

REDUCTION RATIO                               4:1 Min (INGOT CAST)

STRUCTURE                                            Grain size will be ASTM 5 or finer.

ULTRASONIC EXAMINATION           Ultrasonic examination available per ASTM A388/API6A Latest Edition

STOCK RANGE       

Rolled / Peeled Bar                             Heat Treated              16mm – 152.4mm ⌀