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 4051
is a Japanese Industrial Standard that specifies carbon steels for machine
structural use. The standard covers hot-rolled and forged carbon steel bars
widely used in mechanical and engineering components where good strength,
machinability, and reliability are required.
Ladhani
Metal Corporation is a manufacturer, supplier, and stockist of JIS G 4051
carbon steel bars, offering a broad range of grades and sizes to meet
industrial requirements. These steel bars are commonly used in automotive
parts, machine tools, shafts, gears, and general engineering applications.
JIS G 4051
steels are medium to high carbon steels that can be heat treated to improve
hardness and strength, making them suitable for components subjected to
mechanical stress and wear.
Applicable Standard
Standard
Specification: JIS G 4051
Issuing Organization: Japanese Industrial Standards (JIS)
Title: Carbon Steels for Machine Structural Use
The JIS G
4051 standard specifies the chemical composition, mechanical properties, and
manufacturing requirements for carbon steel bars intended for machine
structural applications. The steels covered under this standard are widely used
in Japan and globally for mechanical parts requiring moderate to high strength.
Forms of Supply
JIS G 4051
steel bars are available in various forms depending on manufacturing and
engineering needs.
Round Bars
Square Bars
Flat Bars
Hexagonal Bars
Forged Bars
Bright Bars
Supply conditions include:
Hot rolled
condition
Annealed condition
Normalized condition
Quenched and tempered condition
Cold drawn condition
Standard supply lengths:
3 to 6
meters random length
Cut-to-length bars as per customer specification
Surface finishes available:
Black (mill
finish)
Peeled bars
Turned bars
Centerless ground bars
Bright finished bars
Grades Covered Under JIS G 4051
The standard
includes several carbon steel grades designed for machine structural
applications.
Common
grades include:
S10C, S15C,
S20C, S25C
S30C, S35C, S40C, S45C
S48C, S50C, S53C, S55C
S58C
These grades
vary primarily in carbon content, which influences their hardness, strength,
and heat treatment capability.
Chemical Composition of JIS G 4051 Steel Grades (%)
|
Designation
of
Grade
|
C
|
Si
|
Mn
|
P
|
S
|
|
S10C
|
0.08
– 0.13
|
0.15
– 0.35
|
0.30
– 0.60
|
0.030
max
|
0.035
max
|
|
S12C
|
0.10
– 0.15
|
0.15
– 0.35
|
0.30
– 0.60
|
0.030
max
|
0.035
max
|
|
S15C
|
0.13
– 0.18
|
0.15
– 0.35
|
0.30
– 0.60
|
0.030
max
|
0.035
max
|
|
S17C
|
0.15
– 0.20
|
0.15
– 0.35
|
0.30
– 0.60
|
0.030
max
|
0.035
max
|
|
S20C
|
0.18
– 0.23
|
0.15
– 0.35
|
0.30
– 0.60
|
0.030
max
|
0.035
max
|
|
S22C
|
0.20
– 0.25
|
0.15
– 0.35
|
0.30
– 0.60
|
0.030
max
|
0.035
max
|
|
S25C
|
0.22
– 0.28
|
0.15
– 0.35
|
0.30
– 0.60
|
0.030
max
|
0.035
max
|
|
S28C
|
0.25
– 0.31
|
0.15
– 0.35
|
0.60
– 0.90
|
0.030
max
|
0.035
max
|
|
S30C
|
0.27
– 0.33
|
0.15
– 0.35
|
0.60
– 0.90
|
0.030
max
|
0.035
max
|
|
S33C
|
0.30
– 0.36
|
0.15
– 0.35
|
0.60
– 0.90
|
0.030
max
|
0.035
max
|
|
S35C
|
0.32
– 0.38
|
0.15
– 0.35
|
0.60
– 0.90
|
0.030
max
|
0.035
max
|
|
S38C
|
0.35
– 0.41
|
0.15
– 0.35
|
0.60
– 0.90
|
0.030
max
|
0.035
max
|
|
S40C
|
0.37
– 0.43
|
0.15
– 0.35
|
0.60
– 0.90
|
0.030
max
|
0.035
max
|
|
S43C
|
0.40
– 0.46
|
0.15
– 0.35
|
0.60
– 0.90
|
0.030
max
|
0.035
max
|
|
S45C
|
0.42
– 0.48
|
0.15
– 0.35
|
0.60
– 0.90
|
0.030
max
|
0.035
max
|
|
S48C
|
0.45
– 0.51
|
0.15
– 0.35
|
0.60
– 0.90
|
0.030
max
|
0.035
max
|
|
S50C
|
0.47
– 0.53
|
0.15
– 0.35
|
0.60
– 0.90
|
0.030
max
|
0.035
max
|
|
S53C
|
0.50
– 0.56
|
0.15
– 0.35
|
0.60
– 0.90
|
0.030
max
|
0.035
max
|
|
S55C
|
0.52
– 0.58
|
0.15
– 0.35
|
0.60
– 0.90
|
0.030
max
|
0.035
max
|
|
S58C
|
0.55
– 0.61
|
0.15
– 0.35
|
0.60
– 0.90
|
0.030
max
|
0.035
max
|
|
S09CK
|
0.07
– 0.12
|
0.10
– 0.35
|
0.30
– 0.60
|
0.025
max
|
0.025
max
|
|
S15CK
|
0.13
– 0.18
|
0.15
– 0.35
|
0.30
– 0.60
|
0.025
max
|
0.025
max
|
|
S20CK
|
0.18
– 0.23
|
0.15
– 0.35
|
0.30
– 0.60
|
0.025
max
|
0.025
max
|
Notes
a) Cr shall not be over 0.20 %. However, it may be specified as values under
0.30 % upon the agreement between the manufacturer and the purchaser.
b) As impurities, Cu, Ni, and Ni + Cr for grades S09CK, S15CK and S20CK
shall not exceed respectively 0.25 %, 0.20 %, and 0.30 %, and Cu, Ni, and Ni +
Cr for all other grades shall not exceed respectively 0.30 %, 0.20 %, and 0.35
%. However, the upper limit of Ni + Cr can be specified under 0.40 % for S09CK,
S15CK and S20CK, and may be specified under 0.45 % for other grades upon the
agreement between the manufacturer and the purchaser.
Mechanical Properties of JIS G 4051 Steel Bars
Mechanical
properties vary depending on heat treatment condition and bar size. Typical
values for commonly used grades are shown below.
|
Grade
|
Tensile Strength (MPa)
|
Yield Strength (MPa)
|
Elongation (%)
|
|
S20C
|
400 – 510
|
245
|
25
|
|
S35C
|
570 – 690
|
315
|
20
|
|
S40C
|
600 – 740
|
355
|
18
|
|
S45C
|
570 – 700
|
345
|
17
|
|
S50C
|
620 – 760
|
375
|
16
|
|
S55C
|
650 – 800
|
400
|
14
|
Heat
treatment such as quenching and tempering significantly improves hardness and
strength.
Heat Treatment
JIS G 4051
carbon steels respond well to conventional heat treatment processes.
Common heat
treatment methods include:
Annealing
Normalizing
Quenching
Tempering
Induction hardening
Medium and
high carbon grades such as S45C and S50C are frequently heat treated to achieve
improved wear resistance and mechanical strength.
Key Features of JIS G 4051 Carbon Steel Bars
Good
machinability
Moderate to high tensile strength
Excellent response to heat treatment
Wide range of carbon grades available
Reliable mechanical performance
Cost-effective material for machine components
These
features make JIS G 4051 steels suitable for mechanical parts requiring
durability and strength.
Industrial Applications of JIS G 4051 Steel Bars
JIS G 4051
carbon steel bars are widely used in various industrial sectors.
Automotive
Industry
Shafts
Axles
Gear components
Pins and bushings
Crankshafts
Machinery
Manufacturing
Machine
shafts
Spindles
Couplings
Mechanical linkages
Construction
Equipment
Structural
machine parts
Heavy equipment components
Tool and
Equipment Manufacturing
Industrial
tools
Mechanical hardware
Machine tool components
The
versatility of these steels allows them to be used in many engineering
applications requiring moderate strength and good machinability.
Quality Testing and Inspection
JIS G 4051
steel bars undergo several quality control procedures to ensure compliance with
the standard.
Chemical
composition analysis
Tensile strength testing
Hardness testing
Ultrasonic inspection
Dimensional inspection
Surface quality examination
Material
Test Certificates (MTC) are provided according to customer requirements and
international quality standards.
Conclusion
JIS G 4051
carbon steel bars are widely used machine structural steels offering reliable
mechanical performance, good machinability, and excellent heat treatment
capability. With a wide range of grades available, these steels are suitable
for automotive components, industrial machinery, and general engineering
applications.
Ladhani
Metal Corporation supplies JIS G 4051 carbon steel bars in various grades,
sizes, and supply conditions, ensuring consistent quality and compliance with international
engineering standards.
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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