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Introduction
ASTM A350 /
A350M covers carbon and low-alloy steel forgings intended for
pressure-containing parts requiring notch toughness testing, especially for
low-temperature service. These forgings are designed to provide excellent toughness,
strength, and resistance to brittle fracture in sub-zero environments.
ASTM A350
forgings are widely used in industries where materials must maintain mechanical
integrity under low-temperature and pressure conditions.
Ladhani
Metal Corporation is a manufacturer, supplier, and exporter of ASTM A350 /
A350M carbon and low-alloy steel forgings, supplying high-quality forged
components for critical low-temperature applications.
Applicable Standard
Standard
Specification: ASTM A350 / A350M
Organization: ASTM International
Title: Standard Specification for Carbon and Low-Alloy Steel Forgings,
Requiring Notch Toughness Testing for Piping Components
This
specification covers forged components such as flanges, fittings, and valves
for low-temperature service.
Forms of Supply
ASTM A350
forgings are supplied in the following forms:
Forged
flanges
Forged fittings
Forged rings
Forged discs
Custom-shaped forgings
Supply
Condition
Normalized
condition
Normalized and tempered
Quenched and tempered
Surface
Finish
Black
surface
Rough machined
Shot blasted
Machined finish (if required)
Standard
Sizes
Diameter: Up
to 3000 mm
Thickness: Up to 1000 mm
Weight: As per requirement
(Custom
sizes available as per drawings)
Grades Covered Under ASTM A350 / A350M
LF1
LF2
LF3
LF5
LF6
LF9
These grades
are designed for varying levels of low-temperature toughness and strength.
Chemical Composition of ASTM A350 Forged Steel (%)
|
Element |
Grade LF1 |
Grade LF2 |
Grade LF3 |
Grade LF5 |
Grade LF6 |
Grade LF9 |
Grade LF787 |
|
Carbon, max |
0.30 |
0.30 |
0.20 |
0.30 |
0.22 |
0.20 |
0.07 |
|
Manganese |
0.60–1.35 |
0.60–1.35 |
0.90 max |
0.60–1.35 |
1.15–1.50 |
0.40–1.06 |
0.40–0.70 |
|
Phosphorus, max |
0.035 |
0.035 |
0.035 |
0.035 |
0.025 |
0.035 |
0.025 |
|
Sulfur, max |
0.040 |
0.040 |
0.040 |
0.040 |
0.025 |
0.040 |
0.025 |
|
Silicon |
0.15–0.30 |
0.15–0.30 |
0.20–0.35 |
0.20–0.35 |
0.15–0.30 |
0.30–0.60 |
0.40 max |
|
Nickel |
0.40 max |
0.40 max |
3.3–3.7 |
1.0–2.0 |
0.40 max |
1.60–2.24 |
0.70–1.00 |
|
Chromium |
0.30 max |
0.30 max |
0.30 max |
0.30 max |
0.30 max |
0.30 max |
0.60–0.90 |
|
Molybdenum |
0.12 max |
0.12 max |
0.12 max |
0.12 max |
0.12 max |
0.12 max |
0.15–0.25 |
|
Copper |
0.40 max |
0.40 max |
0.40 max |
0.40 max |
0.40 max |
0.75–1.25 |
1.00–1.30 |
|
Columbium |
0.02 max |
0.02 max |
0.02 max |
0.02 max |
0.02 max |
0.02 max |
0.02 min |
|
Vanadium |
0.08 max |
0.08 max |
0.03 max |
0.03 max |
0.04–0.11 |
0.03 max |
0.03 min |
|
Nitrogen |
— |
— |
— |
— |
0.01–0.030 |
— |
— |
Notes:
- Silicon
content shall be 0.12% max
when vacuum carbon-deoxidation is required.
- Sum
of Cu + Ni + Cr + Mo ≤ 1.00% (heat
analysis).
- Sum
of Cr + Mo ≤ 0.32% (heat) and 0.06% (product analysis) where specified.
Tensile Properties Table
|
Property |
LF1 & LF5 Class 1 |
LF2 (Class 1 & 2) |
LF3 (Class 1 & 2) / LF5 Class 2 |
LF6 Class 1 |
LF6 Class 2 & 3 |
LF9 |
LF787 Class 2 |
LF787 Class 3 |
|
Tensile Strength ksi [MPa] |
60–85 [415–585] |
70–95 [485–655] |
70–95 [485–655] |
66–91 [455–630] |
75–100 [515–690] |
63–88 [435–605] |
65–85 [450–585] |
75–95 [515–655] |
|
Yield Strength min ksi [MPa] |
30 [205] |
36 [250] |
37.5 [260] |
52 [360] |
60 [415] |
46 [315] |
55 [380] |
65 [450] |
|
Elongation (%) – Standard round specimen |
25 |
22 |
22 |
22 |
20 |
25 |
20 |
20 |
|
Elongation (%) – Strip specimen |
28 |
30 |
30 |
30 |
28 |
28 |
28 |
28 |
|
Elongation Formula (thin specimens) |
48t + 13 |
48t + 15 |
48t + 15 |
48t + 15 |
48t + 13 |
48t + 13 |
48t + 13 |
48t + 13 |
|
Reduction of Area (%) |
38 |
30 |
35 |
40 |
40 |
38 |
45 |
45 |
Notes:
- t = actual specimen thickness (inches)
- Elongation
values apply to specimens with gauge length of 2
in. [50 mm]
- Yield
strength determined by 0.2% offset method or
0.5% extension under load
- Values are for room temperature testing
Key Features of ASTM A350 Forged Steel Components
Excellent
toughness at low temperatures
High resistance to brittle fracture
Good strength and durability
Reliable performance in pressure applications
Suitable for cryogenic and sub-zero service
Available in multiple grades for varied applications
Applications of ASTM A350 Forged Steel Components
ASTM A350
forgings are widely used in industries requiring low-temperature performance
and pressure resistance.
Oil &
Gas Industry
• Pipeline flanges
• Low-temperature fittings
Petrochemical
Industry
• Process piping components
• Pressure fittings
Power Plants
• Steam and fluid systems
• Low-temperature piping
Industrial
Applications
• Valves and flanges
• Pressure-containing components
Heat Treatment
Forgings are
typically normalized or quenched and tempered
Heat treatment enhances toughness and strength
Ensures performance under low-temperature conditions
Conclusion
ASTM A350 /
A350M carbon and low-alloy steel forgings provide a dependable solution for
low-temperature and pressure applications. With excellent toughness and
resistance to brittle fracture, these forgings are ideal for piping components
used in demanding environments.
Ladhani
Metal Corporation supplies ASTM A350 / A350M forged components in various
grades and sizes, ensuring high-quality products for oil & gas,
petrochemical, and industrial applications.
FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
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 for Low-Temperature Pressure Components & Flanges){kind=link}