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Introduction
ASTM A735 / A735M covers low-carbon manganese-molybdenum-columbium alloy steel plates intended for welded pressure vessels and boilers requiring high strength, excellent notch toughness, superior weldability, and reliable performance under elevated temperature and pressure service conditions. The controlled addition of manganese, molybdenum, and columbium (niobium) enhances strength, toughness, and creep resistance while maintaining excellent fabrication characteristics.
ASTM A735 / A735M alloy steel plates are widely used in pressure vessels, boilers, heat exchangers, reactors, storage tanks, petrochemical plants, refineries, fertilizer plants, power generation facilities, and industrial process equipment. Their excellent combination of strength, toughness, and resistance to elevated temperature service makes them suitable for critical pressure-retaining applications.
The specification ensures consistent chemical composition, dependable mechanical properties, excellent weldability, and long service life for demanding industrial environments.
Ladhani Metal Corporation is a manufacturer, supplier, and exporter of ASTM A735 / A735M Pressure Vessel Plates, Low-Carbon Manganese-Molybdenum-Columbium Alloy Steel, supplying premium-quality alloy steel plates for pressure vessel, boiler, and industrial engineering applications worldwide.
Applicable Standard
Standard Specification: ASTM A735 / A735M
Organization: ASTM International
Title: Standard Specification for Pressure Vessel Plates, Low-Carbon Manganese-Molybdenum-Columbium Alloy Steel
This specification covers low-carbon manganese-molybdenum-columbium alloy steel plates intended for welded pressure vessels and boilers requiring excellent strength, weldability, and toughness.
Forms of Supply
ASTM A735 / A735M alloy steel products are supplied in the following forms:
• Pressure vessel alloy steel plates
• Boiler quality alloy steel plates
• Heavy thickness plates
• Hot rolled plates
• Heat-treated plates
• Cut-to-length plates
• CNC-cut plates
• Flame-cut plates
• Fabrication-ready plates
• Engineering steel plates
• Industrial alloy steel plates
• Custom-sized plates
Supply Condition
• Hot rolled
• Normalized
• Quenched and tempered (when specified)
• Stress relieved
• Fabrication-ready condition
Surface Finish
• Mill finish
• Shot blasted finish
• Pickled finish
• Ground finish
• Machined finish (when specified)
Standard Sizes
Plates
Thickness: 6 mm to 200 mm
Width: 1000 mm to 3500 mm
Length: Up to 12000 mm
Custom dimensions, flame-cut components, and machined plates are available according to customer requirements.
Chemical Composition of ASTM A735 /
A735M
|
Element |
Heat Analysis (%) |
Product Analysis (%) |
|
Carbon,
max |
0.06 |
0.08 |
|
Manganese
(5/8 in. [16 mm] and under in thickness) |
1.20–1.90 |
1.12–2.04 |
|
Manganese
(Over 5/8 in. [16 mm]) |
1.50–2.20 |
1.41–2.36 |
|
Phosphorus,
max |
0.025 |
0.025 |
|
Sulfur,
max |
0.025 |
0.025 |
|
Silicon,
max |
0.40 |
0.45 |
|
Columbium |
0.03–0.09 |
0.02–0.10 |
|
Molybdenum |
0.23–0.47 |
0.20–0.50 |
|
Copper
(when specified) |
0.20–0.35 |
0.18–0.37 |
Tensile
Requirements
|
Mechanical Property |
Class 1, ksi [MPa] |
Class 2, ksi [MPa] |
Class 3, ksi [MPa] |
Class 4, ksi [MPa] |
|
Yield
Strength, min |
65 [450] |
70 [485] |
75 [515] |
80 [550] |
|
Tensile
Strength |
80–100 [550–690] |
85–105 [585–725] |
90–110 [620–760] |
95–115 [655–790] |
|
Elongation
in 8 in. [200 mm], min, % |
12 |
12 |
12 |
12 |
|
Elongation
in 2 in. [50 mm], min, % |
18 |
18 |
18 |
18 |
Mechanical properties are established according to the specified ASTM A735 / A735M grade and product condition.
Key Features of ASTM A735 / A735M
Plates
• Excellent weldability
• High mechanical strength
• Superior notch toughness
• Good elevated temperature performance
• Excellent pressure resistance
• Reliable fabrication characteristics
• Good dimensional stability
• Long operational service life
• Suitable for critical pressure equipment
• Consistent mechanical performance
Applications of ASTM A735 / A735M
Plates
Pressure Vessel Industry
• Pressure vessels
• Reactor vessels
• Separator vessels
• Pressure chambers
Boiler Industry
• Steam boilers
• Boiler drums
• Water tube boilers
• Boiler pressure components
Petrochemical Industry
• Chemical reactors
• Process vessels
• Refinery equipment
• Storage tanks
Power Generation Industry
• Boiler systems
• Heat exchangers
• Thermal power plant equipment
• Pressure piping components
Oil and Gas Industry
• Process equipment
• Pressure tanks
• Industrial processing systems
• Storage vessels
Industrial Manufacturing
• Heavy engineering equipment
• Fabricated pressure equipment
• Industrial process plants
• Pressure-retaining components
Fabrication and Welding
ASTM A735 / A735M alloy steel plates provide excellent fabrication and welding characteristics.
• Suitable for conventional welding processes
• Excellent forming characteristics
• Good machining performance
• Suitable for heavy fabrication work
• Reliable welded joint performance
• Good dimensional accuracy
Proper welding procedures and post-weld heat treatment should be followed where required by the application.
Heat Treatment
ASTM A735 / A735M alloy steel plates may be supplied in different heat-treated conditions depending on service requirements.
• Normalizing improves toughness and grain refinement
• Quenching and tempering increases strength and toughness (when specified)
• Stress relieving minimizes residual stresses after fabrication
• Controlled rolling ensures consistent mechanical properties
• Heat treatment enhances long-term pressure vessel performance
Advantages of ASTM A735 / A735M
Plates
• Excellent pressure resistance
• Superior weldability
• High structural integrity
• Excellent impact toughness
• Reliable elevated temperature performance
• Outstanding fabrication characteristics
• Long operational service life
• Excellent mechanical stability
• Suitable for critical pressure applications
• Cost-effective engineering material
Conclusion
ASTM A735 / A735M Pressure Vessel Plates, Low-Carbon Manganese-Molybdenum-Columbium Alloy Steel, are premium-quality alloy steel plates developed for welded pressure vessels, boilers, heat exchangers, reactors, and industrial process equipment requiring excellent strength, weldability, toughness, and elevated temperature performance. Available in Grade A and Grade B, these plates are widely used in petrochemical plants, refineries, power generation facilities, fertilizer plants, and other critical pressure vessel applications.
Ladhani Metal Corporation supplies ASTM A735 / A735M low-carbon manganese-molybdenum-columbium alloy steel plates in various grades, thicknesses, heat-treated conditions, surface finishes, and customized dimensions, delivering dependable material solutions for pressure vessel, boiler, and industrial engineering projects worldwide.
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