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Materials

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A 350

The Forged carbon and low-alloy steel forged or ring-rolled flanges, forged fittings and valves intended primarily for low-temperature service and requiring notch toughness testing. They are made to specified dimensions, or to dimensional standards, such as the ASME and API Specifications referenced in Section 2. Although this specification covers some piping components machined from rolled bar and seamless tubular materials, it does not cover raw material produced in these product forms.

Specifications

Standard ASTM A 350/A 350M

Chemical Composition

 

LF1

LF2

LF3

LF5

LF6

LF9

LF787

C

0.30

0.30

0.20

0.30

0.22

0.20

0.07

Mn

0.6 to 1.35

0.6 to 1.35

0.90 max

0.6 to 1.35

1.15 to 1.5

0.40 to 1.06

0.40 to 0.70

P

0.035

0.035

0.035

0.035

0.025

0.035

0.025

S

0.04

0.04

0.04

0.04

0.025

0.04

0.025

Si

0.15 to 0.30

0.15 to 0.30

0.20 to 0.35

0.20 to 0.35

0.15 to 0.30

. . .

0.04 max

Ni

0.40 max

0.40 max

3.3 to 3.7

1.0 to 2.0

0.40 max

1.6 to 2.24

0.70 to 1.0

Cr

0.30 max

0.30 max

0.30 max

0.30 max

0.30 max

0.30 max

0.06 to 0.90

Mo

0.12 max

0.12 max

0.12 max

0.12 max

0.12 max

0.12 max

0.15 to 0.25

Cu

0.040 max

0.040 max

0.040 max

0.040 max

0.040 max

0.75 to 1.25

1.00 to 1.30

Co

0.40 max

0.40 max

0.40 max

0.40 max

0.40 max

0.02 max

0.02 min

V

0.08 max

0.08 max

0.03 max

0.03 max

0.04 to 0.11

0.03 max

0.03 max

N

. . .

. . .

. . .

. . .

0.01–0.030

. . .

 

  • * When vacuum carbon-deoxidation is required by Supplementary Requirement S4, the silicon content shall be 0.12 % maximum.
  • * The sum of copper, nickel, chromium, vanadium and molybdenum shall not exceed 1.00 % on heat analysis.
  • * The sum of chromium and molybdenum shall not exceed 0.32 % on heat analysis.
  • * By agreement, the limit for columbium may be increased up to 0.05 % on heat analysis and 0.06 % on product analysis.

Mechanical & Physical Properties

Property

Values

Ultimate Tensile Strength

485 – 655 Mpa

0.2% Yield Strength

250 Mpa

Elongation

22% min

Reduction of Area

30% min

Charpy Impact Toughness

20 average/16min J at-46o C

Hardness

197 HB max

Heat Treatment:

Forgings of LF2 shall be furnished in the normalized, or in the normalized and tempered, or in the quenched and tempered condition.