FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
Introduction
ASTM
A204 / A204M covers molybdenum alloy steel plates intended primarily for welded
pressure vessels and boilers operating at moderate and elevated temperatures.
These plates are known for their enhanced strength, improved creep resistance,
and good performance under high-temperature service conditions.
The
addition of molybdenum improves high-temperature strength and resistance to
deformation, making ASTM A204 plates suitable for applications where long-term
thermal stability and pressure resistance are required.
Ladhani
Metal Corporation is a manufacturer, supplier, and exporter of ASTM A204 /
A204M alloy steel plates, offering high-quality molybdenum alloy plates for
industrial and pressure vessel applications.
Applicable Standard
- Standard Specification: ASTM A204 / A204M
- Organization: ASTM International
- Title: Pressure Vessel Plates, Alloy Steel,
Molybdenum
This
specification covers alloy steel plates intended for use in welded boilers and
pressure vessels.
Forms of Supply
ASTM
A204 alloy steel plates are available in the following forms:
- Plates
- Cut-to-size plates
- Flame-cut plates
- Hot rolled plates
Supply Condition
- As-rolled condition
- Normalized condition
Surface Finish
- Hot rolled 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 per
requirement
Grades Covered Under ASTM A204 / A204M
- Grade A
- Grade B
- Grade C
These
grades differ in mechanical strength and chemical composition.
Chemical
Requirements (ASTM A204)
|
Element |
Condition |
Grade A (%) |
Grade B (%) |
Grade C (%) |
|
Carbon (max) |
Up to 1 in. [25 mm] |
0.18 |
0.20 |
0.23 |
|
Over 1 to 2 in. [50 mm] |
0.21 |
0.23 |
0.26 |
|
|
Over 2 to 4 in. [100 mm] |
0.23 |
0.25 |
0.28 |
|
|
Over 4 in. [100 mm] |
0.25 |
0.27 |
0.28 |
|
|
Manganese (max) |
Heat analysis |
0.90 |
0.90 |
0.90 |
|
Product analysis |
0.98 |
0.98 |
0.98 |
|
|
Phosphorus (max) |
– |
0.035 |
0.035 |
0.035 |
|
Sulfur (max) |
– |
0.035 |
0.035 |
0.035 |
|
Silicon |
Heat analysis |
0.15–0.40 |
0.15–0.40 |
0.15–0.40 |
|
Product analysis |
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 |
|
Product analysis |
0.41–0.64 |
0.41–0.64 |
0.41–0.64 |
Tensile
Requirements (ASTM A204)
|
Property |
Grade A |
Grade B |
Grade C |
|
Tensile Strength (ksi) |
65–85 |
70–90 |
75–95 |
|
Tensile Strength (MPa) |
450–585 |
485–620 |
515–655 |
|
Yield Strength, min (ksi) |
37 |
40 |
43 |
|
Yield Strength, min (MPa) |
255 |
275 |
295 |
|
Elongation in 8 in. (200 mm), min % |
19 |
17 |
16 |
|
Elongation in 2 in. (50 mm), min % |
23 |
21 |
20 |
Notes:
Elongation determined using:
0.2% offset method, or 0.5% extension-under-load
method
Refer ASTM A20/A20M for elongation adjustment rules
Key Features of ASTM A204 Alloy Steel Plates
- Good high-temperature strength
- Improved creep resistance
- Excellent performance under pressure
- Good weldability
- Molybdenum enhances thermal stability
- Suitable for moderate to elevated
temperature service
- Uniform mechanical properties
Applications of ASTM A204 Alloy Steel Plates
ASTM
A204 plates are widely used in industries requiring heat and pressure
resistance.
Pressure Vessels
- Storage tanks
- Pressure vessels
- Reactors
Boiler Industry
- Boiler shells
- Steam drums
- Heat exchangers
Petrochemical Industry
- Refinery equipment
- Process vessels
Power Plants
- High-temperature equipment
- Thermal systems
Industrial Fabrication
- Heavy engineering components
- Structural applications
Heat Treatment
- Plates are generally supplied in normalized
condition
- Normalizing improves grain structure and
toughness
- Heat treatment enhances strength and
resistance to deformation
Conclusion
ASTM
A204 / A204M alloy steel plates offer a reliable combination of strength, heat
resistance, and durability for pressure vessel and boiler applications. With
molybdenum alloy composition, these plates provide enhanced performance in
elevated temperature environments.
Ladhani
Metal Corporation supplies ASTM A204 / A204M alloy steel plates in various
grades, sizes, and specifications, ensuring high-quality materials for
industrial, thermal, and engineering applications.
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