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Introduction
JIS G 4103
is a Japanese Industrial Standard that specifies nickel-chromium-molybdenum
alloy steels used for high-strength machine structural components. These steels
are designed to provide excellent hardenability, superior toughness, high
fatigue strength, and good resistance to wear under heavy loads.
JIS G 4103
steels are widely used in demanding engineering applications such as automotive
components, aircraft parts, industrial machinery, and heavy mechanical
equipment. Due to the presence of alloying elements like nickel, chromium, and
molybdenum, these steels exhibit improved strength and toughness compared to
ordinary carbon steels.
Ladhani
Metal Corporation is a manufacturer, supplier, and stockist of JIS G 4103 alloy
steel bars, supplying a wide range of grades and sizes for industrial and
engineering applications requiring high performance and reliability.
These steels
are particularly suitable for parts subjected to high stress, shock loads, and
cyclic fatigue.
Applicable Standard
Standard
Specification: JIS G 4103
Issuing Organization: Japanese Industrial Standards (JIS)
Title: Nickel Chromium Molybdenum Steels
JIS G 4103
specifies the chemical composition and mechanical properties of
nickel-chromium-molybdenum alloy steels used for machine structural purposes.
The steels under this specification are capable of achieving high strength and
toughness through heat treatment processes such as quenching and tempering.
These steels
are commonly used for manufacturing heavy-duty mechanical parts that require
excellent fatigue strength and durability.
Forms of Supply
JIS G 4103
alloy steel bars are supplied in various forms to suit 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 4103
Common
grades under this standard include:
SNCM220,
SNCM420, SNCM431, SNCM439, SNCM447
These grades
differ in carbon content and alloy composition, which determine their strength,
hardness, and hardenability characteristics.
JIS G 4103:1979 – Chemical Composition (%)
|
Symbol
/ Class |
Previous
Symbol |
C |
Si |
Mn |
P
(max) |
S
(max) |
Ni |
Cr |
Mo |
|
SNCM 200 |
SNCM 21 |
0.17 –
0.23 |
0.15 –
0.35 |
0.60 –
0.90 |
0.030 |
0.030 |
0.40 –
0.70 |
0.40 –
0.65 |
0.15 –
0.30 |
|
SNCM 240 |
SNCM 6 |
0.38 –
0.43 |
0.15 –
0.35 |
0.70 –
1.00 |
0.030 |
0.030 |
0.40 –
0.70 |
0.40 –
0.65 |
0.15 –
0.30 |
|
SNCM 415 |
SNCM 22 |
0.12 –
0.18 |
0.15 –
0.35 |
0.40 –
0.70 |
0.030 |
0.030 |
1.60 –
2.00 |
0.40 –
0.65 |
0.15 –
0.30 |
|
SNCM 420 |
SNCM 23 |
0.17 –
0.23 |
0.15 –
0.35 |
0.40 –
0.70 |
0.030 |
0.030 |
1.60 –
2.00 |
0.40 –
0.65 |
0.15 –
0.30 |
|
SNCM 431 |
SNCM 1 |
0.27 –
0.35 |
0.15 –
0.35 |
0.60 –
0.90 |
0.030 |
0.030 |
1.60 –
2.00 |
0.60 –
1.00 |
0.15 –
0.30 |
|
SNCM 439 |
SNCM 8 |
0.36 –
0.43 |
0.15 –
0.35 |
0.60 –
0.90 |
0.030 |
0.030 |
1.60 –
2.00 |
0.60 –
1.00 |
0.15 –
0.30 |
|
SNCM 447 |
SNCM 9 |
0.44 –
0.50 |
0.15 –
0.35 |
0.60 –
0.90 |
0.030 |
0.030 |
1.60 –
2.00 |
0.60 –
1.00 |
0.15 –
0.30 |
|
SNCM 616 |
SNCM 26 |
0.13 –
0.18 |
0.15 –
0.35 |
0.80 –
1.20 |
0.030 |
0.030 |
2.80 –
3.20 |
1.40 –
1.80 |
0.40 –
0.60 |
|
SNCM 625 |
SNCM 2 |
0.20 –
0.30 |
0.15 –
0.35 |
0.35 –
0.60 |
0.030 |
0.030 |
2.00 –
3.00 |
0.50 –
1.50 |
0.15 –
0.30 |
|
SNCM 630 |
SNCM 5 |
0.25 –
0.35 |
0.15 –
0.35 |
0.35 –
0.60 |
0.030 |
0.030 |
2.50 –
3.50 |
2.50 –
3.50 |
0.50 –
0.70 |
|
SNCM 815 |
SNCM 25 |
0.12 –
0.18 |
0.15 –
0.35 |
0.50 –
0.60 |
0.030 |
0.030 |
4.00 –
4.50 |
0.70 –
1.00 |
0.15 –
0.30 |
Mechanical
Properties of JIS G 4103 Alloy Steel Bars
Mechanical
properties depend on heat treatment condition and section size. Typical values
after quenching and tempering are shown below.
|
Grade |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
|
SNCM420 |
850 – 1000 |
650 |
16 – 20 |
|
SNCM431 |
900 – 1100 |
700 |
14 – 18 |
|
SNCM439 |
1000 –
1200 |
800 |
12 – 16 |
|
SNCM447 |
1050 –
1250 |
850 |
10 – 14 |
Nickel-chromium-molybdenum
steels such as SNCM439 are known for their excellent combination of strength
and toughness.
Heat
Treatment
JIS G 4103
alloy steels are highly responsive to heat treatment processes.
Common heat
treatment methods include:
Annealing
Normalizing
Quenching
Tempering
Carburizing (for low carbon grades)
These
processes significantly improve hardness, fatigue strength, and wear
resistance.
Key Features of JIS G 4103 Alloy Steel Bars
High tensile
and yield strength
Excellent hardenability
Outstanding fatigue resistance
High impact toughness
Good wear resistance
Suitable for heavy-duty mechanical components
Reliable performance under high stress conditions
These
features make JIS G 4103 steels ideal for critical engineering components.
Industrial Applications of JIS G 4103 Steel Bars
JIS G 4103
alloy steel bars are widely used in industries where high strength and
durability are required.
Automotive Industry
Transmission
gears
Crankshafts
Drive shafts
Axles
Connecting rods
Aerospace Industry
Aircraft
structural components
Landing gear components
High-strength mechanical parts
Heavy Engineering
Industrial
shafts
Machine gears
High-strength fasteners
Forged mechanical parts
Construction and Mining Equipment
Heavy-duty
machine components
Load-bearing mechanical parts
Oil and Gas Industry
High-strength
drilling equipment components
Mechanical parts subjected to heavy loads
Conclusion
JIS G 4103
alloy steel bars provide superior strength, toughness, and fatigue resistance
for demanding engineering applications. With excellent hardenability and the
ability to withstand high stress and heavy loads, these steels are widely used
for critical machine structural components.
Ladhani
Metal Corporation supplies JIS G 4103 alloy steel bars in multiple grades,
sizes, and supply conditions, ensuring high quality materials for automotive,
aerospace, and industrial manufacturing sectors.
FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
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