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Introduction
ASTM B898
covers reactive and refractory metal clad plates consisting of a base metal
that is integrally and continuously bonded on one or both sides with a layer of
reactive or refractory metal. These clad plates are primarily intended for
pressure vessel applications requiring exceptional corrosion resistance while
maintaining the strength and cost advantages of a carbon steel or alloy steel
substrate.
ASTM B898
clad plates combine the corrosion resistance of titanium, zirconium, tantalum,
niobium, and their alloys with the structural strength of a backing material,
creating an economical solution for highly corrosive process environments.
These materials are widely used in chemical processing plants, petrochemical
facilities, fertilizer plants, pharmaceutical industries, offshore
installations, and pressure vessel manufacturing.
The
specification covers clad plates manufactured through approved bonding
processes that ensure continuous metallurgical bonding between the cladding
metal and the base metal. The resulting product provides outstanding corrosion
protection, high mechanical strength, and long-term service reliability in
aggressive operating environments.
Ladhani
Metal Corporation is a manufacturer, supplier, and exporter of ASTM B898
Reactive and Refractory Metal Clad Plates, supplying premium-quality titanium
clad plates, zirconium clad plates, tantalum clad plates, and niobium clad
plates for pressure vessel and industrial applications worldwide.
Applicable Standard
Standard
Specification: ASTM B898
Organization:
ASTM International
Title:
Standard Specification for Reactive and Refractory Metal Clad Plate
This
specification covers plate consisting of a base metal bonded continuously and
integrally on one or both sides with titanium, zirconium, tantalum, niobium, or
their alloys for pressure vessel applications.
Forms of Supply
ASTM B898
products are supplied in the following forms:
•
Titanium clad plates
• Zirconium clad plates
• Tantalum clad plates
• Niobium clad plates
• Dual-side clad plates
• Single-side clad plates
• Pressure vessel clad plates
• Reactor vessel plates
• Heat exchanger clad plates
• Custom fabricated clad plates
• Cut-to-size clad plates
• Heavy thickness clad plates
Cladding Materials
Covered Under ASTM B898
•
Titanium and Titanium Alloys
• Zirconium and Zirconium Alloys
• Tantalum and Tantalum Alloys
• Niobium and Niobium Alloys
The
cladding material may be bonded to carbon steel, alloy steel, stainless steel,
or other approved backing materials depending on application requirements.
Supply Condition
• As clad
• Hot rolled clad
• Explosion bonded clad
• Diffusion bonded clad
• Heat treated
• Fabrication-ready condition
Surface Finish
• Mill
finish
• Pickled finish
• Bright metallic finish
• Ground finish
• Machined finish
• Fabrication finish
Standard Sizes
Clad
Plates
Total
Thickness: 6 mm to 250 mm
Cladding
Thickness: 1 mm to 25 mm
Width: Up
to 4000 mm
Length:
Up to 12000 mm
Custom
dimensions, cladding thicknesses, and fabricated components are available
according to customer specifications.
Chemical Composition
of ASTM B898 Clad Plates
The
chemical composition depends upon the selected cladding material and base metal
combination.
Typical Cladding Materials
|
Cladding Material |
Typical Grade Examples |
|
Titanium |
Grade
1, Grade 2, Grade 7, Grade 12 |
|
Zirconium |
R60702,
R60704, R60705 |
|
Tantalum |
RO5200,
RO5400 |
|
Niobium |
RO4200,
RO4210 |
The
backing material composition is governed by the applicable base metal
specification.
Mechanical Properties
of ASTM B898 Clad Plates
Mechanical
properties are primarily determined by the selected base metal while the clad
layer provides corrosion resistance.
|
Property |
Typical
Performance |
|
Bond
Strength |
Excellent |
|
Structural
Strength |
High |
|
Corrosion
Resistance |
Excellent |
|
Fabrication
Performance |
Good |
|
Pressure
Vessel Performance |
Excellent |
Mechanical
requirements are established by the applicable base metal specification and
ASTM B898 bonding requirements.
Key Features of ASTM
B898 Clad Plates
•
Exceptional corrosion resistance
• High structural strength
• Economical alternative to solid reactive metals
• Excellent bond integrity
• Long service life
• Superior chemical resistance
• Suitable for pressure vessel applications
• Reduced material costs
• Excellent fabrication characteristics
• Reliable performance in aggressive environments
Applications of ASTM
B898 Clad Plates
Chemical Processing Industry
•
Chemical reactors
• Process vessels
• Storage tanks
• Corrosion-resistant equipment
Petrochemical Industry
•
Pressure vessels
• Refinery equipment
• Process columns
• Separation units
Fertilizer Industry
• Acid
storage vessels
• Chemical reactors
• Process equipment
• Corrosion-resistant systems
Pharmaceutical Industry
• Process
vessels
• Production equipment
• Storage systems
• Specialized reactors
Offshore and Marine Industry
•
Seawater handling equipment
• Offshore processing units
• Marine chemical systems
• Corrosion-resistant structures
Pressure Vessel Manufacturing
• Reactor
vessels
• Heat exchanger shells
• Storage vessels
• Industrial pressure equipment
Fabrication and
Welding
ASTM B898
clad plates provide excellent fabrication capabilities when proper procedures
are followed.
•
Suitable for pressure vessel fabrication
• Can be formed and rolled into vessels
• Good machining characteristics
• Suitable for welding using approved procedures
• Excellent bond reliability during fabrication
• Compatible with standard pressure vessel manufacturing methods
Special
care should be taken during welding to preserve clad layer integrity and
corrosion-resistant properties.
Heat Treatment
Heat
treatment may be performed as required by the cladding process or by agreement
between purchaser and manufacturer. The heat treatment requirements depend on
both the cladding material and backing material selected.
• Stress
relieving
• Post-cladding heat treatment
• Controlled thermal processing
• Material-specific heat treatment procedures
• Fabrication-related thermal treatments
Advantages of ASTM
B898 Clad Plates
•
Outstanding corrosion resistance at reduced cost
• Combines strength and corrosion protection
• Excellent pressure vessel performance
• Extended equipment service life
• Reduced maintenance requirements
• Economical compared to solid reactive metals
• Reliable metallurgical bonding
• Suitable for severe chemical environments
• Excellent structural integrity
• Proven industrial performance
Conclusion
ASTM B898
Reactive and Refractory Metal Clad Plates are advanced engineered materials
combining the corrosion resistance of titanium, zirconium, tantalum, and
niobium with the strength and economy of conventional backing metals. These
clad plates are extensively used in pressure vessels, reactors, heat
exchangers, storage tanks, and chemical processing equipment where exceptional
corrosion resistance and structural reliability are required.
Ladhani Metal Corporation
supplies ASTM B898 reactive and refractory metal clad plates in various
material combinations, thicknesses, and customized dimensions, delivering
dependable corrosion-resistant solutions for chemical, petrochemical,
pharmaceutical, marine, and industrial applications worldwide.
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