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Introduction
ASTM B688 covers
chromium-nickel-molybdenum-iron alloy plate, sheet, and strip manufactured for
applications requiring exceptional corrosion resistance, high mechanical
strength, and excellent performance in aggressive chemical and marine
environments. These high-alloy materials offer outstanding resistance to
pitting, crevice corrosion, stress corrosion cracking, and oxidation, making
them suitable for critical industrial applications.
ASTM B688 alloy plate, sheet,
and strip are widely used in chemical processing plants, offshore and marine
industries, oil and gas facilities, power generation plants, pollution control
equipment, pharmaceutical industries, desalination plants, pulp and paper
industries, and heat exchanger applications. Their excellent resistance to
chloride-containing environments and aggressive chemicals ensures long service
life and dependable performance.
The specification ensures
controlled chemical composition, excellent mechanical properties, superior
dimensional accuracy, and outstanding fabrication characteristics for demanding
engineering applications.
Ladhani Metal Corporation is
a manufacturer, supplier, and exporter of ASTM B688 Alloy Plate, Sheet &
Strip, supplying premium-quality alloy products for chemical processing,
marine, power generation, oil & gas, and industrial engineering
applications worldwide.
Applicable Standard
Standard Specification: ASTM
B688
Organization: ASTM
International
Title: Standard Specification
for Chromium-Nickel-Molybdenum-Iron (UNS N08366 and UNS N08367) Plate, Sheet,
and Strip
This specification covers
chromium-nickel-molybdenum-iron alloy plate, sheet, and strip intended for
applications requiring superior corrosion resistance, high strength, and
long-term durability in severe service environments.
Forms of Supply
ASTM B688 alloy products are
supplied in the following forms:
• Plates
• Sheets
• Strips
• Hot Rolled Plates
• Cold Rolled Sheets
• Precision Strips
• Cut-to-Size Plates
• Slit Strips
• Fabrication-Ready Materials
• Custom Sizes
Grades Covered Under ASTM B688
UNS N08366
UNS N08367
Supply Condition
• Hot Rolled Condition
• Cold Rolled Condition
• Annealed Condition
• Solution Annealed Condition
• Pickled Condition
• Fabrication-Ready Condition
Surface Finish
• Mill Finish
• No.1 Finish
• 2B Finish
• Bright Annealed Finish
• Pickled Finish
• Polished Finish
Standard Sizes
Plates, Sheets & Strips
Thickness: 0.3 mm to 100 mm
Width: 10 mm to 2500 mm
Length: Up to 12000 mm
Custom thicknesses, widths,
lengths, slit strips, and cut-to-size materials are available according to
customer requirements.
Chemical Composition of ASTM B688
|
Element |
N08366 |
N08367 |
Product (Check) Analysis Variation, Under or Over Max.
of Specified Limit (%) |
|
Carbon, Max % |
0.035 |
0.030 |
0.005 |
|
Manganese, Max % |
2.00 |
2.00 |
0.04 |
|
Silicon, Max % |
1.00 |
1.00 |
0.05 |
|
Phosphorus, Max % |
0.040 |
0.040 |
0.005 |
|
Sulfur, Max % |
0.030 |
0.030 |
0.005 |
|
Chromium, % |
20.00–22.00 |
20.00–22.00 |
0.25 |
|
Nickel, % |
23.50–25.50 |
23.50–25.50 |
0.20 |
|
Molybdenum, % |
6.00–7.00 |
6.00–7.00 |
0.15 |
|
Nitrogen, % |
— |
0.18–0.25 |
0.01 |
|
Iron |
Remainder |
Remainder |
— |
|
Copper, Max % |
— |
0.75 |
0.04 |
Note:
- Iron shall be determined
arithmetically by difference.
Mechanical
Properties for Plate, Sheet, and Strip
|
Property |
N08366 |
N08367 |
|
Yield Strength, 0.2% Offset, Min (ksi
[MPa]) |
35 [240] |
45 [310] |
|
Tensile Strength, Min (ksi [MPa]) – ≤ 3/16
in. (4.8 mm) Thick |
75 [515] |
100 [690] |
|
Tensile Strength, Min (ksi [MPa]) – >
3/16 in. Thick |
75 [515] |
95 [655] |
|
Elongation in 2 in. or 50 mm (4D), Min % |
30A |
30A |
|
Hardness, Max – ≤ 3/16 in. (4.8 mm) Thick |
95 HRB |
100 HRB |
|
Hardness, Max – > 3/16 in. Thick |
212 HBN |
240 HBN |
Notes:
- A:
Not applicable for thicknesses under 0.015 in. (0.40 mm).
- B:
Hardness values (Brinell, Rockwell, or equivalent) are for information
only and shall not be used as the basis for acceptance or rejection.
Mechanical property
requirements vary according to the selected grade, product form, thickness, and
heat treatment condition.
Key Features of ASTM B688 Alloy Plate, Sheet & Strip
• Excellent corrosion
resistance
• Outstanding resistance to pitting and crevice corrosion
• Superior resistance to stress corrosion cracking
• High mechanical strength
• Excellent oxidation resistance
• Good weldability
• Excellent formability
• Superior fabrication characteristics
• Long service life
• Suitable for aggressive chemical environments
Applications of ASTM B688 Alloy Plate, Sheet & Strip
Chemical Processing Industry
• Chemical reactors
• Storage tanks
• Pressure vessels
• Process equipment
• Chemical handling systems
Oil & Gas Industry
• Offshore platforms
• Process equipment
• Heat exchangers
• Separation systems
• Piping components
Marine Industry
• Seawater handling systems
• Marine structures
• Offshore equipment
• Desalination plants
Power Generation Industry
• Heat exchangers
• Condensers
• Flue gas desulfurization systems
• Power plant equipment
Pharmaceutical Industry
• Process vessels
• Storage systems
• Production equipment
• Clean processing applications
Industrial Applications
• Pollution control equipment
• Scrubbers
• Industrial heat exchangers
• Corrosion-resistant components
Fabrication and Welding
ASTM B688 alloy plate, sheet,
and strip offer excellent fabrication and welding characteristics.
• Suitable for conventional
welding processes
• Good cold forming characteristics
• Excellent machinability
• Reliable welded joint performance
• Excellent dimensional stability
• Easy fabrication into complex components
Proper welding procedures
should be followed to maintain corrosion resistance and mechanical properties.
Heat Treatment
ASTM B688 products are
generally supplied in the annealed or solution-annealed condition.
• Solution annealing improves
corrosion resistance
• Annealing enhances ductility and formability
• Controlled heat treatment ensures uniform mechanical properties
• Stress relieving minimizes fabrication stresses
• Proper heat treatment improves long-term service performance
Advantages of ASTM B688 Alloy Plate, Sheet & Strip
• Outstanding corrosion
resistance
• Excellent mechanical strength
• Superior resistance to aggressive chemicals
• Excellent weldability
• High-temperature performance
• Long service life
• Low maintenance requirements
• Excellent dimensional stability
• Easy fabrication
• Cost-effective solution for critical industrial applications
Conclusion
ASTM B688 Alloy Plate, Sheet & Strip are high-performance chromium-nickel-molybdenum-iron alloy products designed for applications requiring exceptional corrosion resistance, high strength, and reliable performance in aggressive industrial environments. Available in UNS N08366 and UNS N08367, these alloy products are widely used in chemical processing, oil & gas, marine, power generation, pharmaceutical, and pollution control industries. Ladhani Metal Corporation supplies ASTM B688 Alloy Plate, Sheet & Strip in various grades, thicknesses, surface finishes, and customized dimensions, delivering reliable alloy solutions for chemical processing, marine, industrial engineering, and critical process applications worldwide.
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