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Introduction
ASTM A302 /
A302M covers alloy steel plates intended for use in pressure vessels operating
at moderate to high temperatures. These plates are manufactured using
manganese-molybdenum and manganese-molybdenum-nickel compositions, offering
enhanced strength, toughness, and resistance to elevated temperature service.
ASTM A302
alloy steel plates are widely used in critical pressure vessel applications
where improved mechanical properties and thermal stability are required.
Ladhani
Metal Corporation is a manufacturer, supplier, and exporter of ASTM A302 /
A302M alloy steel plates, supplying high-quality plates for pressure vessels
and boiler applications.
Applicable Standard
Standard
Specification: ASTM A302 / A302M
Organization: ASTM International
Title: Standard Specification for Pressure Vessel Plates, Alloy Steel,
Manganese-Molybdenum and Manganese-Molybdenum-Nickel
This
specification covers alloy steel plates for welded pressure vessels designed
for elevated temperature service.
Forms of Supply
ASTM A302
alloy steel plates are supplied in the following forms:
Hot rolled
plates
Normalized plates
Quenched and tempered plates
Cut-to-size plates
Supply
Condition
As-rolled
condition
Normalized condition
Quenched and tempered condition
Surface
Finish
Mill finish
Shot blasted
Pickled (if required)
Standard
Sizes
Thickness: 6
mm to 150 mm
Width: Up to 3000 mm
Length: Up to 12000 mm or as required
Grades Covered Under ASTM A302 / A302M
Grade A
(Mn-Mo)
Grade B (Mn-Mo)
Grade C (Mn-Mo-Ni)
Grade D (Mn-Mo-Ni)
These grades
provide varying strength levels and alloy compositions for different pressure
vessel requirements.
Chemical Composition of ASTM A302 Alloy Steel Plates
(%)
|
Element |
Grade A |
Grade B |
Grade C |
Grade D |
|
Carbon (Max) |
||||
|
Up to 1 in [25
mm] |
0.20 |
0.20 |
0.20 |
0.20 |
|
>1 in to 2 in
[50 mm] |
0.23 |
0.23 |
0.23 |
0.23 |
|
>2 in [50 mm] |
0.25 |
0.25 |
0.25 |
0.25 |
|
Manganese (Heat
Analysis) |
0.95–1.30 |
1.15–1.50 |
1.15–1.50 |
1.15–1.50 |
|
Manganese (Product
Analysis) |
0.87–1.41 |
1.07–1.62 |
1.07–1.62 |
1.07–1.62 |
|
Phosphorus (Max) |
0.025 |
0.025 |
0.025 |
0.025 |
|
Sulfur (Max) |
0.025 |
0.025 |
0.025 |
0.025 |
|
Silicon (Heat
Analysis) |
0.15–0.40 |
0.15–0.40 |
0.15–0.40 |
0.15–0.40 |
|
Silicon (Product
Analysis) |
0.13–0.45 |
0.13–0.45 |
0.13–0.45 |
0.13–0.45 |
|
Molybdenum (Heat
Analysis) |
0.45–0.60 |
0.45–0.60 |
0.45–0.60 |
0.45–0.60 |
|
Molybdenum (Product
Analysis) |
0.41–0.64 |
0.41–0.64 |
0.41–0.64 |
0.41–0.64 |
|
Nickel
(Heat Analysis) |
0.40–0.70 |
0.70–1.00 |
— |
— |
|
Nickel
(Product Analysis) |
0.37–0.73 |
0.67–1.03 |
— |
— |
Tensile Requirements
|
Property |
Grade A |
Grade B |
Grade C |
Grade D |
|
Tensile
Strength |
75–95 ksi
(515–655 MPa) |
80–100 ksi
(550–690 MPa) |
80–100 ksi
(550–690 MPa) |
80–100 ksi
(550–690 MPa) |
|
Yield
Strength (Min) |
45 ksi (310 MPa) |
50 ksi (345 MPa) |
50 ksi (345 MPa) |
50 ksi (345 MPa) |
|
Elongation
in 8 in (200 mm) |
15% |
15% |
17% |
17% |
|
Elongation
in 2 in (50 mm) |
19% |
18% |
20% |
20% |
Notes:
- Chemical
limits apply to both heat and product
analysis unless specified.
- Elongation
adjustment as per ASTM A20/A20M.
- Nickel
is specified only for Grade A & B.
Key Features of ASTM A302 Alloy Steel Plates
Suitable for
elevated temperature service
High strength and toughness
Good resistance to thermal stress and fatigue
Enhanced performance due to molybdenum and nickel content
Good weldability with proper procedures
Reliable performance in pressure vessel applications
Applications of ASTM A302 Alloy Steel Plates
ASTM A302
plates are widely used in industries requiring strength, durability, and
pressure resistance.
Pressure
Vessels
• High-temperature pressure vessels
• Reactor vessels
Power Plants
• Boiler components
• Steam drums
Petrochemical
Industry
• Process vessels
• Heat-resistant equipment
Oil &
Gas Industry
• Refinery vessels
• Storage tanks
Heat Treatment
Plates are
typically supplied in normalized or quenched and tempered condition
Heat treatment improves strength, toughness, and temperature resistance
Ensures uniform grain structure and enhanced performance
Conclusion
ASTM A302 /
A302M alloy steel pressure vessel plates provide a reliable solution for
high-temperature and high-pressure applications. With manganese-molybdenum and
manganese-molybdenum-nickel compositions, these plates offer excellent
strength, toughness, and resistance to thermal stress.
Ladhani
Metal Corporation supplies ASTM A302 / A302M alloy steel plates in various
grades and sizes, ensuring high-quality products for pressure vessels, power
plants, and petrochemical industries.
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