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ASTM A53
ASTM A106
API 5L
ASTM A333
ASTM A335
ASTM A312
ASTM A350
ASTM A105
ASTM A694
ASTM A182
A350 LF2
ASTM A234
ASTM A420
ASTM A860
 A193 B7
A194 2H
A240 GR.410
A312 S31726

A350 LF2 

ASTM A350 - Forgings, Carbon and Low-Alloy Steel, Requiring Notch Toughness Testing for Piping Components

 

Grade: LF2

 

Chemical   Compositions   (max, %)

C: 0.30

Mn: 0.60-1.35

P: 0.035

S: 0.040 A

Si: 0.15-0.30

Ni: 0.40 B

Cr: 0.30 B,C

Mo: 0.12 B,C

Cu: 0.4 B

Nb: 0.02 C

V: 0.08

A When vacuum carbon-deoxidation is required by Supplementary Requirement S4, the silicon content shall be 0.12 % maximum.

B The sum of copper, nickel, chromium, vanadium and molybdenum shall not exceed 1.00 % on heat analysis.

C The sum of chromium and molybdenum shall not exceed 0.32 % on heat analysis.

D By agreement, the limit for columbium may be increased up to 0.05 % on heat analysis and 0.06 % on product analysis.

 

Tensile Properties at Room Temperature

Tensile strength, ksi [MPa]: 70–95 [485–655]

 

Yield strength, min, ksi [MPa]: 36 [250]

 

Elongation:

Standard round specimen, or small proportional specimen, min % in 4D gage length: 22

Strip specimen for wall thickness 5⁄16 in. [7.94 mm] and over and for all small sizes tested in full section; min % in 2 in. [50 mm]: 30

Equation for calculating min elongation for strip specimens thinner than 5⁄16 in. [7.94 mm]; min % in 2 in. [50 mm]: 48t+15 (t = actual thickness in inches)

 

Reduction of area, min, %: 30

 

Hardness Test: ≤197 HB

 

Impact Test:

 

Charpy V-Notch Energy Requirements for Standard Size [10 by 10 mm] Specimens

 

Minimum Impact Energy Required for Average of Each Set of Three Specimens, ft-lbf [J]

Minimum Impact Energy Permitted for One Specimen only of a Set, ft-lbf [J]

LF2 Class 1

15 [20]

12 [16]

LF2 Class 2

20 [27]

15 [20]

 

Standard Impact Test Temperature for Standard Size [10 by 10 mm] Specimens

Grade

Test Temperature, °F [°C]

LF2 Class 1

−50 [−46]

LF2 Class 2

−0 [−18]

 


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