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Introduction
JIS G 3114 specifies
hot-rolled atmospheric corrosion resisting steels intended for bridges,
architecture and other welded structures. These steels are designed to provide
improved resistance to atmospheric corrosion together with suitable strength,
toughness and weldability for structural fabrication.
Ladhani Metal Corporation
supplies JIS G 3114 steel sheets, plates and related hot-rolled products in
weather-resistant welded structural steel grades on an order basis.
Applicable Standard
JIS G 3114:2022 – Hot-rolled
atmospheric corrosion resisting steels for welded structure.
JIS G 3114:2022 was published
on 22 March 2022 and supersedes JIS G 3114:2016. The Japanese Standards
Association currently lists the 2022 edition as valid and confirmed it on 22
June 2026.
Material Type
JIS G 3114 steel is available
as:
·
Weathering
Steel
·
Atmospheric
Corrosion Resisting Steel
·
Mild
Steel (MS)
·
Carbon
Structural Steel (CS)
·
Welded
Structural Steel
·
Hot-Rolled
Structural Steel
·
Weather-Resistant
Structural Steel
The material contains
controlled additions of elements such as copper, chromium and, for W grades,
nickel to improve atmospheric corrosion resistance.
Scope
JIS G 3114 covers hot-rolled
atmospheric corrosion resisting steel products intended for:
·
Bridges
·
Buildings
and architectural structures
·
Welded
structural components
·
Outdoor
structural applications
·
Other
welded structures exposed to atmospheric conditions
The standard specifies
requirements intended to provide a combination of atmospheric corrosion
resistance, weldability and structural performance.
Chemical Composition
The chemical composition is
controlled to obtain the required combination of atmospheric corrosion
resistance, strength and weldability. The following summarizes the principal
limits for the major grades.
|
Grade |
C
max. % |
Si
% |
Mn
max. % |
P
max. % |
S
max. % |
Cu
% |
Cr
% |
Ni
% |
|
SMA400AW/BW/CW |
0.18 |
0.15–0.65 |
1.25 |
0.035 |
0.035 |
0.30–0.50 |
0.45–0.75 |
0.05–0.30 |
|
SMA400AP/BP/CP |
0.18 |
≤0.55 |
1.25 |
0.035 |
0.035 |
0.20–0.35 |
0.30–0.55 |
— |
|
SMA490AW/BW/CW |
0.18 |
0.15–0.65 |
1.40 |
0.035 |
0.035 |
0.30–0.50 |
0.45–0.75 |
0.05–0.30 |
|
SMA490AP/BP/CP |
0.18 |
≤0.55 |
1.40 |
0.035 |
0.035 |
0.20–0.35 |
0.30–0.55 |
— |
|
SMA570W |
0.18 |
0.15–0.65 |
1.40 |
0.035 |
0.035 |
0.30–0.50 |
0.45–0.75 |
0.05–0.30 |
|
SMA570P |
0.18 |
≤0.55 |
1.40 |
0.035 |
0.035 |
0.20–0.35 |
0.30–0.55 |
— |
Additional alloying elements
may be added where required by the standard and applicable grade.
Mechanical Properties
The mechanical requirements
vary according to grade and plate thickness. Typical strength ranges specified
for the major grade groups are shown below.
|
Grade |
Yield Strength / Proof Stress |
Tensile Strength |
Elongation |
|
SMA400AW/BW/CW |
195–245 MPa min. |
400–540 MPa |
17–23% |
|
SMA400AP/BP/CP |
195–245 MPa min. |
400–540 MPa |
17–23% |
|
SMA490AW/BW/CW |
295–365 MPa min. |
490–610 MPa |
15–23% |
|
SMA490AP/BP/CP |
295–365 MPa min. |
490–610 MPa |
15–23% |
|
SMA570W |
420–460 MPa min. |
570–720 MPa |
19–26% |
|
SMA570P |
420–460 MPa min. |
570–720 MPa |
19–26% |
Exact yield strength and
elongation requirements are thickness-dependent and should be confirmed against
the specified grade and product thickness.
Atmospheric Corrosion
Resistance
JIS G 3114 steels are alloyed
to provide improved resistance to corrosion in natural atmospheric
environments.
Their weathering
characteristics are associated particularly with controlled additions of:
·
Copper
·
Chromium
·
Nickel
·
Silicon
and manganese within specified limits
The controlled alloying
promotes the development of a protective weathered surface layer during
atmospheric exposure, reducing the rate of further corrosion under suitable
environmental conditions.
Weldability
JIS G 3114 grades are
intended specifically for welded structures.
Important characteristics
include:
·
Controlled
carbon content
·
Controlled
alloying additions
·
Suitable
carbon-equivalent characteristics
·
Good
weldability
·
Suitable
toughness
·
Reliable
performance in welded fabrication
·
Compatibility
with structural welding processes
Weldability requirements
should be considered together with the selected grade, thickness and welding
procedure.
Manufacturing Process
JIS G 3114 steel sheets and
plates are produced through controlled hot-rolling processes.
The manufacturing process can
include:
·
Steelmaking
·
Continuous
casting or slab casting
·
Slab
reheating
·
Hot
rolling
·
Controlled
rolling
·
Controlled
cooling
·
Straightening
·
Surface
conditioning
·
Cutting
to required dimensions
Manufacturing parameters are
selected according to grade, thickness, mechanical properties and required
corrosion resistance.
Manufacturing Conditions
JIS G 3114 products can be
supplied in suitable manufacturing conditions according to grade and customer
requirements.
Common conditions include:
·
Hot
rolled
·
Controlled
rolled
·
Normalized
where specified
·
Thermomechanically
controlled where applicable
·
Heat-treated
condition where specified
·
Straightened
·
Cut-to-length
The applicable manufacturing
condition should be confirmed at the time of order.
Heat Treatment
Heat treatment may be applied
according to the specified grade, thickness and purchase requirements.
Possible conditions include:
·
As
rolled
·
Normalized
·
Normalized
and tempered where specified
·
Controlled
rolling
·
Stress-relieved
condition where agreed
The actual delivery
heat-treatment condition depends on the ordered grade and specification.
Surface Finish
JIS G 3114 steel sheets and
plates can be supplied with different surface finishes according to application
and customer requirements.
Common options include:
·
Hot-rolled
mill finish
·
Descaled
finish
·
Shot-blasted
finish
·
Pickled
finish
·
Pickled
and oiled finish
·
Primer-coated
finish
·
Cleaned
surface
·
Customized
surface preparation
For weathering-steel
applications, the final surface treatment should be selected according to the
intended atmospheric exposure and coating requirements.
Delivery Condition
JIS G 3114 products can be
supplied in various delivery conditions depending on grade, thickness and
application.
Typical delivery conditions
include:
·
As
hot rolled
·
Controlled
rolled
·
Normalized
·
Normalized
and tempered where specified
·
Straightened
·
Descaled
·
Pickled
and oiled
·
Shot
blasted
·
Primer
coated
·
Cut-to-length
·
Customized
delivery condition
Dimensions and Tolerances
JIS G 3114 steel plates,
sheets and strips are supplied according to applicable dimensional and mass
tolerances. JIS G 3193 is referenced for dimensions, mass and permissible variations
of hot-rolled steel plates, sheets and strips.
Products can be supplied in:
·
Standard
thicknesses
·
Custom
thicknesses
·
Standard
widths
·
Custom
widths
·
Cut-to-length
plates
·
Heavy
plates
·
Hot-rolled
sheets
·
Steel
strips and coils where applicable
·
Customized
dimensions
Weathering Structural
Steel Characteristics
JIS G 3114 steels offer a
combination of:
·
Atmospheric
corrosion resistance
·
Good
weldability
·
Structural
strength
·
Good
toughness
·
Controlled
alloying
·
Weather-resistant
performance
·
Reduced
dependence on protective coating in suitable environments
·
Good
fabrication characteristics
·
Availability
in multiple strength levels
The W and P designations
distinguish corrosion-resistant alloying systems, with W grades incorporating
nickel in the specified composition range.
Forms of Supply
Ladhani Metal Corporation can
supply JIS G 3114 materials in various forms, subject to grade and size
availability:
·
Steel
sheets
·
Steel
plates
·
Hot-rolled
plates
·
Hot-rolled
sheets
·
Steel
strips
·
Hot-rolled
coils
·
Structural
flats
·
Cut-to-size
plates
·
Cut-to-length
sheets
·
Custom
dimensions
Applications
JIS G 3114 atmospheric
corrosion resisting steels are used for:
·
Bridges
·
Bridge
girders
·
Building
structures
·
Architectural
structures
·
Railway
infrastructure
·
Outdoor
structural frameworks
·
Welded
structural components
·
Industrial
structures
·
Transportation
infrastructure
·
Containers
·
Heavy
fabricated structures
·
Other
welded structures exposed to atmospheric conditions
The standard specifically
covers bridges, architecture and other welded structures.
Key Features
·
JIS
G 3114:2022 specification
·
Hot-rolled
atmospheric corrosion resisting steel
·
Mild
steel and carbon structural steel characteristics
·
Weathering
steel grades
·
14
principal grade designations
·
Copper-chromium
alloying
·
Copper-chromium-nickel
alloying for W grades
·
Improved
atmospheric corrosion resistance
·
Good
weldability
·
Suitable
structural strength
·
Good
toughness
·
Multiple
surface-finish options
·
Multiple
delivery conditions
·
Custom
sizes available on order
Availability
JIS G 3114 steel sheets and
plates are available on order basis from Ladhani Metal Corporation.
Availability depends on:
·
Grade
·
Thickness
·
Width
·
Length
·
Surface
finish
·
Delivery
condition
·
Quantity
·
Required
documentation
·
Customer-specific
requirements
Conclusion
JIS G 3114 is a specification
for hot-rolled atmospheric corrosion resisting steels intended for welded
structures. The standard covers weathering steel grades with different strength
levels and controlled alloying systems designed to provide improved atmospheric
corrosion resistance along with structural strength and weldability.
Ladhani Metal Corporation
supplies JIS G 3114 steel sheets, plates and related hot-rolled weathering
steel products in required grades, dimensions and delivery conditions on an
order basis.
To place an order or enquiry,
contact Ladhani Metal Corporation.
FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
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