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Introduction
ASTM A871 covers
high-strength low-alloy (HSLA) structural steel plates intended for
applications requiring superior atmospheric corrosion resistance, excellent
mechanical strength, and long-term durability. These weathering steel plates
develop a stable protective oxide layer when exposed to atmospheric conditions,
reducing the need for painting and minimizing maintenance costs.
ASTM A871 steel plates are
widely used in bridges, buildings, railway wagons, transportation equipment,
utility structures, industrial buildings, architectural projects, heavy
construction equipment, and other outdoor structural applications where
enhanced weather resistance is essential. Their combination of high strength,
excellent weldability, and corrosion resistance makes them a preferred material
for exposed structural components.
The specification ensures
consistent chemical composition, mechanical properties, dimensional accuracy,
and atmospheric corrosion resistance, making ASTM A871 steel plates suitable
for demanding structural and engineering applications.
Ladhani Metal Corporation is
a manufacturer, supplier, and exporter of ASTM A871 High-Strength Low-Alloy
Structural Steel Plates, supplying premium-quality weather-resistant steel
plates for structural, construction, transportation, and industrial
applications worldwide.
Applicable
Standard
Standard Specification: ASTM
A871 / A871M
Organization: ASTM
International
Title: Standard Specification
for High-Strength Low-Alloy Structural Steel Plates with Atmospheric Corrosion
Resistance
This specification covers
high-strength low-alloy structural steel plates intended for welded, bolted, or
riveted structures requiring improved atmospheric corrosion resistance.
Forms of Supply
ASTM A871 steel plates are
supplied in the following forms:
• Structural steel plates
• Weathering steel plates
• Hot rolled plates
• Heavy plates
• Cut-to-size plates
• Profile cut plates
• Fabrication-ready plates
• Shot blasted plates
• Primed plates
• Mill finish plates
• Custom-sized plates
Grades Covered Under ASTM
A871
• Grade 60
• Grade 65
Supply Condition
• Hot rolled
• Normalized (when specified)
• Thermo-mechanically processed
• Shot blasted
• Primer coated (optional)
• Fabrication-ready condition
Surface Finish
• Mill finish
• Shot blasted finish
• Primer coated finish
• Rust-preweathered finish (on request)
• Smooth finish
Standard Sizes
Plates
Thickness: 6 mm to 150 mm
Width: 1000 mm to 3500 mm
Length: Up to 12000 mm
Custom thicknesses, widths,
lengths, and profile-cut plates are available according to customer
requirements.
Chemical Composition of ASTM
A871
|
Element |
Type
I |
Type
II |
Type
III |
Type
IV |
|
Carbon, Max % |
0.19 Max |
0.20 Max |
0.15 Max |
0.17 Max |
|
Manganese, % |
0.80–1.35 |
0.75–1.35 |
0.80–1.35 |
0.50–1.20 |
|
Phosphorus, Max % |
0.04 Max |
0.04 Max |
0.04 Max |
0.04 Max |
|
Sulfur, Max % |
0.05 Max |
0.05 Max |
0.05 Max |
0.05 Max |
|
Silicon, % |
0.30–0.65 |
0.15–0.50 |
0.15–0.40 |
0.25–0.50 |
|
Nickel, % |
0.40 Max |
0.50 Max |
0.25–0.50 |
0.40 Max |
|
Chromium, % |
0.40–0.70 |
0.40–0.70 |
0.30–0.50 |
0.40–0.70 |
|
Molybdenum, % |
— |
— |
— |
0.10 Max |
|
Copper, % |
0.25–0.40 |
0.20–0.40 |
0.20–0.50 |
0.30–0.50 |
|
Vanadium, % |
0.02–0.10 |
0.01–0.10 |
0.01–0.10 |
— |
|
Columbium, % |
— |
— |
— |
0.005–0.05B |
Notes:
- A: For each reduction of 0.01 percentage point below the specified maximum carbon
content, an increase of 0.06
percentage point above the specified maximum manganese content is
permitted, up to a maximum of 1.50%.
- B: For plates under ½ in. (13 mm) in thickness, the minimum columbium requirement is waived.
The chemical composition
requirements vary according to the selected ASTM A871 grade.
Key
Features of ASTM A871 Steel Plates
• Excellent atmospheric
corrosion resistance
• High mechanical strength
• Superior weathering
properties
• Excellent weldability
• Good formability
• Long service life
• Reduced maintenance costs
• Excellent toughness
• High structural reliability
• Suitable for exposed
outdoor structures
Applications
of ASTM A871 Steel Plates
Bridge Construction
• Highway bridges
• Railway bridges
• Pedestrian bridges
• Structural bridge
components
Building Construction
• Structural frames
• Commercial buildings
• Industrial buildings
• Architectural structures
Transportation Industry
• Railway wagons
• Freight cars
• Truck bodies
• Transportation equipment
Industrial Structures
• Storage facilities
• Material handling equipment
• Industrial platforms
• Heavy structural components
Infrastructure Projects
• Transmission towers
• Utility poles
• Sign structures
• Outdoor steel frameworks
Heavy Engineering
• Construction equipment
• Mining structures
• Industrial fabrication
• Heavy-duty structural
applications
Fabrication
and Welding
ASTM A871 steel plates offer
excellent fabrication and welding characteristics.
• Suitable for conventional
welding processes
• Excellent cutting
performance
• Good forming
characteristics
• Easy machining
• Excellent dimensional
stability
• Reliable welded joint
performance
Proper welding procedures
should be followed to maintain atmospheric corrosion resistance and mechanical
properties.
Heat
Treatment
ASTM A871 steel plates are
generally supplied in the hot rolled or normalized condition.
• Normalizing improves
toughness
• Controlled rolling enhances
strength
• Stress relieving minimizes
fabrication stresses
• Uniform heat treatment
ensures consistent mechanical properties
• Proper processing improves
long-term structural performance
Advantages
of ASTM A871 Steel Plates
• Outstanding weather
resistance
• Excellent atmospheric
corrosion resistance
• High structural strength
• Long service life
• Reduced painting
requirements
• Low maintenance costs
• Excellent weldability
• Good fabrication
characteristics
• Superior durability
• Cost-effective structural
solution
Conclusion
ASTM A871 High-Strength
Low-Alloy Structural Steel Plates are designed for structural applications
requiring excellent atmospheric corrosion resistance, high strength,
weldability, and long-term durability. Available in Grade 60 and Grade 65, these weathering steel plates are
extensively used in bridges, buildings, transportation equipment, industrial
structures, and infrastructure projects exposed to outdoor environments.
Ladhani Metal Corporation
supplies ASTM A871 High-Strength Low-Alloy Structural Steel Plates in various
grades, thicknesses, sizes, surface finishes, and customized dimensions,
delivering reliable structural steel solutions for construction,
infrastructure, transportation, and heavy engineering projects worldwide.
FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
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