FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
www.ladhanimetal.com
www.ladhanimetal.in
ladhanimetal@gmail.com
info@ladhanimetals.com
Introduction
JIS G 4105
is a Japanese Industrial Standard that specifies chromium-molybdenum alloy
steels used for machine structural applications. These steels are designed to
provide high strength, excellent hardenability, good fatigue resistance, and
improved wear resistance under demanding operating conditions.
JIS G 4105
steels are widely used for manufacturing high-strength machine components such
as shafts, gears, bolts, and automotive parts. The presence of alloying
elements such as chromium and molybdenum enhances the steel’s mechanical
performance, allowing it to withstand heavy loads, high stress, and elevated
temperatures.
Ladhani
Metal Corporation is a manufacturer, supplier, and stockist of JIS G 4105 alloy
steel bars, supplying a wide range of grades and sizes for automotive, heavy
engineering, construction equipment, and industrial machinery applications.
These steels
are particularly suitable for components requiring good strength and durability
combined with reliable heat treatment response.
Applicable Standard
Standard
Specification: JIS G 4105
Issuing Organization: Japanese Industrial Standards (JIS)
Title: Chromium Molybdenum Steels
JIS G 4105
specifies the chemical composition and mechanical properties of
chromium-molybdenum alloy steels intended for machine structural use. These
steels are widely used for parts that require high strength, good toughness,
and resistance to fatigue.
The standard
is commonly adopted in automotive manufacturing, heavy machinery production,
and mechanical engineering industries.
Forms of Supply
JIS G 4105
alloy steel bars are available in multiple product forms to meet engineering
and manufacturing requirements.
Round Bars
Square Bars
Flat Bars
Hexagonal Bars
Forged Bars
Bright Bars
Typical supply conditions include:
Hot rolled
condition
Annealed condition
Normalized condition
Quenched and tempered condition
Cold drawn condition
Standard supply lengths:
3 to 6 meter
random lengths
Fixed lengths
Cut-to-size bars as per customer specifications
Surface finishes available:
Black (mill
finish)
Peeled bars
Turned bars
Centerless ground bars
Bright finished bars
Grades Covered Under JIS G 4105
The JIS G
4105 standard includes chromium-molybdenum alloy steel grades widely used for
machine structural parts.
SCM415,
SCM418, SCM420, SCM425, SCM430, SCM432, SCM435, SCM440
These steels
vary in carbon content and alloy composition, which influence their strength,
hardness, and heat treatment response.
JIS G 4105 Alloy Steel Bars – Chemical Composition
(%)
|
Symbol of Class
|
Reference Previous Symbol
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Mo
|
|
SCM415
|
SCM21
|
0.13–0.18
|
0.15–0.35
|
0.60–0.85
|
0.030
max
|
0.030
max
|
0.90–1.20
|
0.15–0.30
|
|
SCM418
|
—
|
0.16–0.21
|
0.15–0.35
|
0.60–0.85
|
0.030
max
|
0.030
max
|
0.90–1.20
|
0.15–0.30
|
|
SCM420
|
SCM22
|
0.18–0.23
|
0.15–0.35
|
0.60–0.85
|
0.030
max
|
0.030
max
|
0.90–1.20
|
0.15–0.30
|
|
SCM421
|
SCM23
|
0.17–0.23
|
0.15–0.35
|
0.70–1.00
|
0.030
max
|
0.030
max
|
0.90–1.20
|
0.15–0.30
|
|
SCM430
|
SCM2
|
0.28–0.33
|
0.15–0.35
|
0.60–0.85
|
0.030
max
|
0.030
max
|
0.90–1.20
|
0.15–0.30
|
|
SCM432
|
SCM1
|
0.27–0.33
|
0.15–0.35
|
0.80–1.10
|
0.030
max
|
0.030
max
|
1.00–1.30
|
0.15–0.25
|
|
SCM435
|
SCM3
|
0.33–0.38
|
0.15–0.35
|
0.60–0.85
|
0.030
max
|
0.030
max
|
0.90–1.20
|
0.15–0.30
|
|
SCM440
|
SCM4
|
0.38–0.43
|
0.15–0.35
|
0.60–0.85
|
0.030
max
|
0.030
max
|
0.90–1.20
|
0.15–0.30
|
|
SCM445
|
SCM5
|
0.43–0.48
|
0.15–0.35
|
0.60–0.85
|
0.030
max
|
0.030
max
|
0.90–1.20
|
0.15–0.20
|
|
SCM822
|
SCM24
|
0.20–0.25
|
0.15–0.35
|
0.60–0.85
|
0.030
max
|
0.030
max
|
0.90–1.20
|
0.35–0.45
|
Remarks
from the Standard
As impurities:
Ni ≤ 0.25% Cu ≤ 0.30% for all classes.
When
product analysis is requested by the purchaser,
tolerance shall conform to Table 3 of JIS G 0321.
Mechanical Properties of JIS G 4105 Alloy Steel Bars
Mechanical
properties vary depending on heat treatment condition and section size. Typical
values after quenching and tempering are shown below.
|
Grade
|
Tensile Strength (MPa)
|
Yield Strength (MPa)
|
Elongation (%)
|
|
SCM420
|
780 – 930
|
590
|
15 – 20
|
|
SCM430
|
850 – 1000
|
650
|
14 – 18
|
|
SCM435
|
930 – 1080
|
785
|
12 – 16
|
|
SCM440
|
980 – 1180
|
835
|
10 – 14
|
These steels
provide a good balance of strength, toughness, and fatigue resistance.
Heat
Treatment
JIS G 4105
steels respond well to several heat treatment processes.
Common heat
treatment methods include:
Annealing
Normalizing
Quenching
Tempering
Carburizing (for lower carbon grades)
Heat
treatment significantly improves hardness, strength, and wear resistance,
allowing these steels to be used for high-strength mechanical components.
Key Features of JIS G 4105 Alloy Steel Bars
High tensile
strength and toughness
Excellent hardenability
Good fatigue resistance
Improved wear resistance after heat treatment
Good machinability in annealed condition
Reliable performance under heavy loads
Suitable for high-stress machine components
These
properties make JIS G 4105 steels highly suitable for critical mechanical
applications.
Industrial Applications of JIS G 4105 Steel Bars
JIS G 4105
alloy steel bars are widely used in industries requiring strong and durable
mechanical components.
Automotive Industry
Transmission
gears
Crankshafts
Drive shafts
Axles
High-strength bolts
Heavy Machinery
Industrial
shafts
Machine tool components
Mechanical couplings
Forged machine parts
Construction and Mining Equipment
Load-bearing
mechanical parts
Heavy equipment components
Oil and Gas Industry
Drilling
equipment components
High-strength fasteners
Power Generation
Turbine
shafts
Generator components
These steels
are widely selected for applications where strength, durability, and fatigue
resistance are essential.
Conclusion
JIS G 4105
alloy steel bars provide excellent strength, toughness, and wear resistance for
demanding machine structural applications. Their chromium-molybdenum alloy
composition allows them to achieve superior mechanical properties through heat
treatment.
Ladhani
Metal Corporation supplies JIS G 4105 alloy steel bars in various grades,
sizes, and supply conditions, ensuring high-quality materials for automotive,
heavy engineering, and industrial manufacturing industries.
FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
www.ladhanimetal.com
www.ladhanimetal.in
ladhanimetal@gmail.com
info@ladhanimetals.com
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