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Introduction
JIS G 3101 specifies rolled steels for general structural applications. The standard covers hot-rolled steel products and hot-extruded sections for applications such as bridges, ships, rolling stock and other structures.
The materials covered are primarily mild steel (MS), carbon steel (CS) and general structural steel. The “SS” in grades such as SS400 means structural steel and does not mean stainless steel.
For commercial supply, Ladhani Metal Corporation offers JIS G 3101 structural steel in the required grades, forms, dimensions and lengths.
Applicable Standard
- JIS
G 3101:2024
- Title:
Rolled steels for general structure
- Material
type: MS / CS / Carbon Structural Steel
- Current
edition: 2024
- Publication
date: 20 February 2024
Material Type
JIS G 3101 products are classified as:
- Mild
Steel (MS)
- Carbon
Steel (CS)
- Carbon
Structural Steel
- General
Structural Steel
- Hot-Rolled
Structural Steel
JIS G 3101 is not a stainless-steel standard. SS330, SS400, SS490 and SS540 are structural-steel grades.
Scope
JIS G 3101 covers rolled steels and applicable hot-extruded sections for general structural applications.
Typical products include:
- Steel
plates
- Steel
sheets
- Steel
strips
- Flats
Typical applications include:
- Bridges
- Ships
- Rolling
stock
- Structural
frameworks
- General
engineering structures
Steel Grades Covered
JIS G 3101 includes four principal grades.
|
Grade |
Material
Type |
General
Description |
|
SS330 |
MS / CS |
General structural steel |
|
SS400 |
MS / CS |
General structural steel |
|
SS490 |
MS / CS |
Higher-strength structural steel |
|
SS540 |
MS / CS |
Higher-strength structural steel |
Chemical Composition
The specified chemical requirements for JIS G 3101 grades are shown below.
|
Grade |
C max. % |
Mn max. % |
P max. % |
S max. % |
|
SS330 |
— |
— |
0.050 |
0.050 |
|
SS400 |
— |
— |
0.050 |
0.050 |
|
SS490 |
— |
— |
0.050 |
0.050 |
|
SS540 |
0.30 |
1.60 |
0.040 |
0.040 |
- SS330,
SS400 and SS490 do not specify maximum carbon and manganese values in this
table.
- SS540
specifies carbon and manganese limits.
- Phosphorus
and sulphur are controlled for all four grades.
Mechanical Properties
Mechanical requirements vary according to grade and product thickness.
|
Grade |
Thickness |
Yield Point /
Proof Strength min. MPa |
Tensile
Strength MPa |
Elongation
min. % |
|
SS330 |
≤16 mm |
205 |
330–430 |
26 |
|
SS330 |
>16–40 mm |
195 |
330–430 |
21–26 |
|
SS330 |
>40–100 mm |
175 |
330–430 |
24–28 |
|
SS400 |
≤16 mm |
245 |
400–510 |
17–21 |
|
SS400 |
>16–40 mm |
235 |
400–510 |
21–23 |
|
SS400 |
>40–100 mm |
215 |
400–510 |
19–23 |
|
SS490 |
≤16 mm |
285 |
490–610 |
15–19 |
|
SS490 |
>16–40 mm |
275 |
490–610 |
19–21 |
|
SS490 |
>40–100 mm |
255 |
490–610 |
17–21 |
|
SS540 |
≤16 mm |
400 |
≥540 |
13–16 |
|
SS540 |
>16–40 mm |
390 |
≥540 |
13–17 |
Manufacturing Process
JIS G 3101 products are primarily manufactured through hot rolling, with applicable hot-extruded sections covered by the current standard.
Typical manufacturing steps include:
- Steelmaking
- Casting
of slabs, blooms or billets
- Reheating
- Hot
rolling
- Section
forming
- Hot
extrusion for applicable sections
- Cutting
- Straightening
- Dimensional
control
- Final
inspection and marking
Manufacturing Conditions
Depending on product form and order requirements, JIS G 3101 materials can be supplied as:
- Hot
rolled
- Hot
rolled and straightened
- Rolled
structural sections
- Hot-extruded
sections
- Cut-to-length
products
- Customized
sizes
The actual manufacturing condition depends on the product form, grade and purchase requirements.
Heat Treatment
JIS G 3101 is primarily a hot-rolled structural steel specification rather than a dedicated heat-treated alloy-steel standard.
Typical supply conditions include:
- As
rolled
- Controlled
rolling where applicable
- Stress-relieved
condition when specifically agreed
- Other
supplementary conditions by agreement
Surface Finish
JIS G 3101 products can be supplied with surface finishes appropriate to their manufacturing and end-use requirements.
Typical surface finishes include:
- Mill
finish
- Hot-rolled
finish
- Descaled
surface
- Pickled
surface, where specified
- Shot-blasted
surface, where specified
- Primed
surface, where required
- Oiled
surface for protection during storage and transportation
Additional surface preparation should be agreed at the time of ordering.
Delivery Condition
JIS G 3101 structural steels can be supplied in delivery conditions appropriate to the product and purchaser requirements.
Common delivery conditions include:
- As
hot rolled
- Hot
rolled and straightened
- Cut-to-length
- Descaled
- Pickled
and oiled, where specified
- Shot
blasted and primed, where specified
- Customized
delivery condition by agreement
The applicable delivery condition depends on the grade, product form, dimensions and customer requirements.
Dimensions and Tolerances
JIS G 3101 products are supplied according to the applicable dimensional requirements.
Available dimensions can include:
- Plate
thickness and width
- Sheet
thickness and width
- Strip
dimensions
- Flat-bar
dimensions
- Round-bar
dimensions
- Structural-section
dimensions
- Cut
lengths
- Customized
dimensions
For structural sections, dimensions, shape, mass and permissible variations are governed by the applicable JIS product requirements.
Structural Steel Characteristics
JIS G 3101 is designed for general structural applications where strength, fabrication characteristics and dimensional consistency are required.
Key characteristics include:
- Mild/carbon
structural steel construction
- Hot-rolled
manufacturing
- Multiple
strength grades
- General
structural strength
- Good
fabrication characteristics
- Suitable
forms for structural fabrication
- Availability
in plates, sheets, strips, sections, flats and bars
For dedicated weldable structural steel requirements, JIS G 3106 is a separate standard.
Forms of Supply
Ladhani Metal Corporation can supply JIS G 3101 materials in forms such as:
- Steel
plates
- Steel
sheets
- Hot-rolled
sheets
- Steel
strips
- Strip
in coil
- Flat
bars
- Round
bars
- Structural
sections
- Angles
- Channels
- Beams
- Hot-extruded
sections
- Cut-to-length
products
- Customized
sizes on order basis
Applications
JIS G 3101 structural steels are used for general engineering and structural applications such as:
- Bridges
- Ships
- Railway
and rolling-stock structures
- Structural
frameworks
- Industrial
structures
- Fabrication
projects
- Machinery
structures
- General
construction
- Steel
platforms
- Supports
and frames
- Engineering
structures
Key Features
- JIS
G 3101 structural steel
- MS
/ CS / carbon structural steel
- Hot-rolled
construction
- Four
principal grades: SS330, SS400, SS490 and SS540
- Multiple
product forms
- Controlled
mechanical properties
- Defined
phosphorus and sulphur limits
- SS540
has specified carbon and manganese limits
- Available
with different surface finishes
- Multiple
delivery conditions
- Suitable
for general structural fabrication
- Available
in standard and customized dimensions
Availability
JIS G 3101 rolled structural steels are available on order basis in SS330, SS400, SS490 and SS540 grades, subject to product form, dimensions and quantity requirements.
Ladhani Metal Corporation can supply material according to specified grade, thickness, width, length, section size, surface finish and delivery condition.
Conclusion
JIS G 3101 is a Japanese standard for rolled steels used in general structural applications. The materials are primarily classified as mild steel (MS), carbon steel (CS) and general structural steel.
The standard covers SS330, SS400, SS490 and SS540 grades and provides materials for plates, sheets, strips, sections, flats and bars used in bridges, ships, rolling stock and other structural applications.
To place an order or enquiry for JIS G 3101 rolled structural steel, contact Ladhani Metal Corporation.
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