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Introduction
JIS
G 3103 specifies hot-rolled carbon steel and molybdenum alloy steel plates
intended for boilers and pressure vessels.
The
materials are designed for pressure equipment and elevated-temperature service,
where strength, weldability and resistance to temperature-related degradation
are important.
For
commercial supply, Ladhani Metal Corporation offers JIS G 3103 boiler and
pressure vessel steel plates in the required grades, thicknesses, widths,
lengths and delivery conditions.
Applicable Standard
- JIS G
3103
- Title:
Carbon steel and molybdenum alloy steel plates for boilers and other
pressure vessels
- Material
type: Carbon Steel (CS), Mild Steel (MS) and Molybdenum Alloy Steel
- Product
type: Hot-rolled steel plates
- Application:
Boilers and pressure vessels
- Main
grades: SB410, SB450, SB480, SB450M and SB480M
JIS
G 3103 specifies requirements for carbon steel and molybdenum alloy steel
plates used for boilers and pressure vessels, particularly for medium- and
higher-temperature service. Kikakurui
Material Type
JIS
G 3103 materials are classified as:
- Carbon
Steel (CS)
- Mild
Steel (MS)
- Boiler
Steel
- Pressure
Vessel Steel
- Molybdenum
Alloy Steel
- Carbon-Molybdenum
Steel
The
SB410, SB450 and SB480 grades are carbon steel grades, while SB450M and SB480M
are molybdenum-alloyed grades containing approximately 0.45–0.60% Mo. Emerson Metal
Scope
JIS
G 3103 covers steel plates intended for:
- Boilers
- Pressure
vessels
- Heat-resistant
pressure equipment
- Elevated-temperature
service
- Fabricated
pressure-containing equipment
- Industrial
equipment operating under pressure
The
standard applies to hot-rolled carbon steel and molybdenum alloy steel plates
for boilers and pressure vessels. Kikakurui
Chemical Composition
The
chemical composition requirements vary according to grade and plate thickness.
The principal composition requirements are shown below. Kikakurui
|
Grade |
C max. % |
Si % |
Mn max. % |
P max. % |
S max. % |
Mo % |
|
SB410 |
0.24–0.27 |
0.15–0.40 |
0.90 |
0.030 |
0.030 |
— |
|
SB450 |
0.28–0.31 |
0.15–0.40 |
0.90 |
0.030 |
0.030 |
— |
|
SB480 |
0.31–0.33 |
0.15–0.40 |
1.20 |
0.030 |
0.030 |
— |
|
SB450M |
0.25–0.28 |
0.15–0.40 |
0.90 |
0.030 |
0.030 |
0.45–0.60 |
|
SB480M |
0.27–0.30 |
0.15–0.40 |
1.20 |
0.030 |
0.030 |
0.45–0.60 |
- Carbon
limits can vary with plate thickness.
- Molybdenum
is the principal alloying addition in SB450M and SB480M.
- Additional
residual-element limits apply according to the standard.
- The
standard permits certain adjustments between carbon and manganese within
specified limits. Kikakurui
Mechanical Properties
Mechanical
properties depend on the grade and plate thickness. JIS G 3103 specifies yield
point or proof stress, tensile strength, elongation and bendability
requirements. Kikakurui
|
Grade |
Yield Point / Proof Strength min. MPa |
Tensile Strength MPa |
Elongation min. % |
|
SB410 |
225 |
410–550 |
21–25 |
|
SB450 |
245 |
450–590 |
19–23 |
|
SB480 |
265 |
480–620 |
17–21 |
|
SB450M |
255 |
450–590 |
19–23 |
|
SB480M |
275 |
480–620 |
17–21 |
- Yield
strength requirements can vary according to thickness.
- Elongation
requirements depend on the tensile-test specimen and plate thickness.
- Bend
testing requires the specified bending angle and inside radius without
cracking on the outside of the bent specimen. Kikakurui
Manufacturing Process
JIS
G 3103 plates are manufactured primarily through hot rolling.
Typical
manufacturing steps include:
- Steelmaking
- Casting
of slabs
- Slab
reheating
- Hot
rolling
- Controlled
thickness reduction
- Cooling
- Straightening
- Cutting
to required dimensions
- Surface
inspection
- Dimensional
control
- Final
marking
Manufacturing Conditions
Depending
on the grade, thickness and purchaser requirements, JIS G 3103 plates can be
supplied in conditions such as:
- As hot
rolled
- Normalized
- Normalized
and tempered
- Annealed
- Quenched
and tempered, where applicable
- Controlled
rolled condition where agreed
The
appropriate delivery condition depends on the grade, thickness and required
mechanical properties.
Heat Treatment
Heat
treatment is an important consideration for JIS G 3103 pressure vessel plates.
Typical
conditions include:
- Normalizing
- Normalizing
and tempering
- Annealing
- Quenching
and tempering
- Stress-relieving
treatment where specified
For
certain grades and thickness ranges, the standard specifies particular
heat-treatment requirements. For example, SB480M requires normalizing when the
plate thickness exceeds the specified limit. Studylib
Surface Finish
JIS
G 3103 plates can be supplied with surface finishes appropriate for boiler and
pressure vessel fabrication.
Typical
surface finishes include:
- Hot-rolled
mill finish
- Descaled
surface
- Shot-blasted
surface
- Pickled
surface, where specified
- Pickled
and oiled surface, where required
- Primer-coated
surface for suitable storage or fabrication requirements
Surface
preparation beyond the standard mill condition should be agreed at the time of
ordering.
Delivery Condition
JIS
G 3103 plates can be supplied in delivery conditions appropriate to the grade
and application.
Common
delivery conditions include:
- As hot
rolled
- Normalized
- Normalized
and tempered
- Annealed
- Quenched
and tempered, where applicable
- Stress-relieved
condition where specified
- Cut-to-length
- Customized
delivery condition by agreement
The
delivery condition is selected according to the grade, thickness, mechanical
requirements and purchaser specifications.
Dimensions and Tolerances
JIS
G 3103 plates are supplied according to the specified thickness, width and
length requirements.
Available
dimensions can include:
- Standard
plate thicknesses
- Heavy-thickness
plates
- Wide
plates
- Cut-to-length
plates
- Customized
widths
- Customized
lengths
- Project-specific
dimensions
The
chemical and mechanical requirements can vary with plate thickness, making the
specified thickness an important part of the material order. Kikakurui
Pressure Vessel Steel
Characteristics
JIS
G 3103 is designed for pressure-containing equipment operating under
elevated-temperature conditions.
Key
characteristics include:
- Carbon
steel and molybdenum alloy steel construction
- Good
strength at elevated temperatures
- Suitable
pressure-vessel fabrication characteristics
- Weldable
plate grades
- Controlled
chemical composition
- Defined
tensile and yield properties
- Specified
bendability
- Suitable
for boiler and pressure-vessel fabrication
- Molybdenum
alloy options for enhanced elevated-temperature service
Forms of Supply
Ladhani
Metal Corporation can supply JIS G 3103 materials in forms such as:
- Boiler
steel plates
- Pressure
vessel plates
- Carbon
steel plates
- Molybdenum
alloy steel plates
- Hot-rolled
plates
- Heavy
plates
- Cut-to-length
plates
- Customized-size
plates
- Plates
with specified heat-treatment conditions
Applications
JIS
G 3103 steel plates are used for pressure and elevated-temperature applications
such as:
- Boilers
- Pressure
vessels
- Steam
drums
- Heat
exchangers
- Industrial
boilers
- Power
generation equipment
- Petrochemical
equipment
- Chemical
processing equipment
- Pressure-containing
structures
- High-temperature
industrial equipment
- Fabricated
pressure vessels
The
standard is specifically intended for boiler and pressure-vessel applications. Kikakurui
Key Features
- JIS G
3103 compliant boiler and pressure vessel steel
- MS / CS /
molybdenum alloy steel
- Hot-rolled
steel plate
- Five
principal grades
- SB410,
SB450 and SB480 carbon steel grades
- SB450M
and SB480M molybdenum alloy grades
- Controlled
chemical composition
- Defined
mechanical properties
- Suitable
for elevated-temperature pressure service
- Multiple
heat-treatment conditions
- Multiple
surface-finish options
- Available
in customized dimensions
- Suitable
for boiler and pressure-vessel fabrication
Conclusion
JIS
G 3103 is a Japanese standard covering carbon steel and molybdenum alloy steel
plates for boilers and other pressure vessels. The material types include MS,
CS and Mo alloy steel, with SB410, SB450, SB480, SB450M and SB480M as the
principal grades.
These
plates are designed for pressure-containing equipment and elevated-temperature
applications, including boilers, pressure vessels, power-generation equipment
and industrial process equipment.
To
place an order or enquiry for JIS G 3103 carbon steel and molybdenum alloy
steel plates, contact Ladhani Metal Corporation.
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