JIS G 4053 Alloy Steel Bars – Specifications, Grades, Chemical Composition, Mechanical Properties, and Industrial Applications

FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-

www.ladhanimetal.com

www.ladhanimetal.in

Introduction

JIS G 4053 is a Japanese Industrial Standard that specifies alloy steels for machine structural use. These steels are designed for applications that require higher strength, improved hardenability, better wear resistance, and superior mechanical performance compared to plain carbon steels.

Ladhani Metal Corporation is a manufacturer, supplier, and stockist of JIS G 4053 alloy steel bars, supplying a wide range of grades for automotive, heavy engineering, industrial machinery, and mechanical equipment manufacturing.

JIS G 4053 alloy steels contain alloying elements such as chromium, molybdenum, nickel, manganese, and silicon. These elements enhance the mechanical properties of steel, allowing it to perform efficiently under high stress, heavy loads, and demanding operating conditions.

These steels are commonly used for shafts, gears, axles, bolts, machine components, and various high-strength mechanical parts.

Applicable Standard

Standard Specification: JIS G 4053
Issuing Organization: Japanese Industrial Standards (JIS)
Title: Low Alloy Steels for Machine Structural Use

JIS G 4053 specifies the chemical composition and mechanical properties of alloy steels used in machine structural applications. The steels covered under this standard are suitable for heat treatment to achieve higher hardness, strength, and toughness.

This standard is widely adopted in automotive manufacturing, mechanical engineering, and industrial machinery production.

Forms of Supply

JIS G 4053 alloy steel bars are supplied in a variety of 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 bars
Annealed bars
Normalized bars
Quenched and tempered bars
Cold drawn bars

Standard lengths include:

3 to 6 meters random length
Fixed lengths
Cut-to-size bars as per customer specifications

Surface finishes available:

Black (mill finish)
Peeled bars
Turned bars
Centerless ground bars
Bright polished bars

Grades Covered Under JIS G 4053

The JIS G 4053 standard includes various alloy steel grades commonly used for machine structural applications.

Common grades include:

SCr415, SCr420, SCr430, SCr440
SCM415, SCM420, SCM430, SCM435, SCM440
SNCM220, SNCM420, SNCM431, SNCM439, SNCM447
SNC415, SNC631
SMn420

These grades are classified according to their alloying elements such as chromium steels, chromium-molybdenum steels, and nickel-chromium-molybdenum steels.

JIS G 4053 Alloy Steel Grades – Chemical Composition (%)

Grade	C	Si	Mn	P (Max)	S (Max)	Ni (Max)	Cr	Mo
SMn420	0.17–0.23	0.15–0.35	1.20–1.50	0.030	0.030	0.25	≤0.35	—
SMn433	0.30–0.36	0.15–0.35	1.20–1.50	0.030	0.030	0.25	≤0.35	—
SMn438	0.35–0.41	0.15–0.35	1.35–1.65	0.030	0.030	0.25	≤0.35	—
SMn443	0.40–0.46	0.15–0.35	1.35–1.65	0.030	0.030	0.25	≤0.35	—
SMnC420	0.17–0.23	0.15–0.35	1.20–1.50	0.030	0.030	0.25	0.35–0.70	—
SMnC443	0.40–0.46	0.15–0.35	1.35–1.65	0.030	0.030	0.25	0.35–0.70	—
SCr415	0.13–0.18	0.15–0.35	0.60–0.90	0.030	0.030	0.25	0.90–1.20	—
SCr420	0.18–0.23	0.15–0.35	0.60–0.90	0.030	0.030	0.25	0.90–1.20	—
SCr430	0.28–0.33	0.15–0.35	0.60–0.90	0.030	0.030	0.25	0.90–1.20	—
SCr435	0.33–0.38	0.15–0.35	0.60–0.90	0.030	0.030	0.25	0.90–1.20	—
SCr440	0.38–0.43	0.15–0.35	0.60–0.90	0.030	0.030	0.25	0.90–1.20	—
SCr445	0.43–0.48	0.15–0.35	0.60–0.90	0.030	0.030	0.25	0.90–1.20	—
SCM415	0.13–0.18	0.15–0.35	0.60–0.90	0.030	0.030	0.25	0.90–1.20	0.15–0.25
SCM418	0.16–0.21	0.15–0.35	0.60–0.90	0.030	0.030	0.25	0.90–1.20	0.15–0.25
SCM420	0.18–0.23	0.15–0.35	0.60–0.90	0.030	0.030	0.25	0.90–1.20	0.15–0.25
SCM421	0.17–0.23	0.15–0.35	0.70–1.00	0.030	0.030	0.25	0.90–1.20	0.15–0.25
SCM425	0.23–0.28	0.15–0.35	0.60–0.90	0.030	0.030	0.25	0.90–1.20	0.15–0.30
SCM430	0.28–0.33	0.15–0.35	0.60–0.90	0.030	0.030	0.25	0.90–1.20	0.15–0.30
SCM432	0.27–0.37	0.15–0.35	0.30–0.60	0.030	0.030	0.25	1.00–1.50	0.15–0.30
SCM435	0.33–0.38	0.15–0.35	0.60–0.90	0.030	0.030	0.25	0.90–1.20	0.15–0.30
SCM440	0.38–0.43	0.15–0.35	0.60–0.90	0.030	0.030	0.25	0.90–1.20	0.15–0.30
SCM445	0.43–0.48	0.15–0.35	0.60–0.90	0.030	0.030	0.25	0.90–1.20	0.15–0.30
SCM822	0.20–0.25	0.15–0.35	0.60–0.90	0.030	0.030	—	—	0.35–0.45
SNC236	0.32–0.40	0.15–0.35	0.50–0.80	0.030	0.030	1.00–1.50	0.50–0.90	—
SNC415	0.12–0.18	0.15–0.35	0.35–0.65	0.030	0.030	2.00–2.50	0.20–0.50	—
SNC631	0.27–0.35	0.15–0.35	0.35–0.65	0.030	0.030	2.50–3.00	0.60–1.00	—
SNC815	0.12–0.18	0.15–0.35	0.35–0.65	0.030	0.030	3.00–3.50	0.60–1.00	—
SNC836	0.32–0.40	0.15–0.35	0.35–0.65	0.030	0.030	3.00–3.50	0.60–1.00	—
SNCM220	0.17–0.23	0.15–0.35	0.60–0.90	0.030	0.030	0.40–0.70	0.40–0.60	0.15–0.25
SNCM240	0.38–0.43	0.15–0.35	0.70–1.00	0.030	0.030	0.40–0.70	0.40–0.60	0.15–0.30
SNCM415	0.12–0.18	0.15–0.35	0.40–0.70	0.030	0.030	1.60–2.00	0.40–0.60	0.15–0.30
SNCM420	0.17–0.23	0.15–0.35	0.40–0.70	0.030	0.030	1.60–2.00	0.40–0.60	0.15–0.30
SNCM431	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
SNCM439	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
SNCM447	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
SNCM616	0.13–0.20	0.15–0.35	0.80–1.20	0.030	0.030	2.80–3.20	1.40–1.80	0.40–0.60

Additional Notes:

For steels where Cu is not specified, Cu ≤ 0.30%.

SNCM630: Minimum Mo may be specified as 0.30% by agreement.

SACM645: Al content: 0.70–1.20%.

Mechanical Properties of JIS G 4053 Steel Bars

Mechanical properties depend on the grade and heat treatment condition. Typical properties for commonly used grades are shown below.

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)
SCM420	780 – 930	590	15 – 20
SCM435	930 – 1080	785	12 – 16
SCM440	980 – 1180	835	10 – 14
SNCM439	1080 – 1280	835 – 980	10 – 15

Nickel-containing grades such as SNCM439 offer excellent toughness and fatigue resistance for highly stressed components.

Heat Treatment

JIS G 4053 steels respond well to various heat treatment processes.

Common heat treatment methods include:

Annealing
Normalizing
Quenching
Tempering
Carburizing (for low carbon alloy grades)

Heat treatment improves hardness, strength, wear resistance, and fatigue life.

Key Features of JIS G 4053 Alloy Steel Bars

High tensile strength
Excellent hardenability
Superior fatigue resistance
Good toughness under heavy loads
Excellent wear resistance after heat treatment
Good machinability in annealed condition
Suitable for carburizing and quenching processes

These features make JIS G 4053 steels suitable for demanding mechanical applications.

Industrial Applications of JIS G 4053 Steel Bars

JIS G 4053 alloy steel bars are widely used in industries requiring high-strength mechanical components.

Automotive Industry

Transmission shafts
Gear components
Axles
Crankshafts
Connecting rods

Heavy Machinery

Industrial shafts
Machine gears
Couplings
Forged machine parts

Construction Equipment

Heavy-duty mechanical components
Load-bearing parts

Oil and Gas Industry

High-strength bolts
Drilling equipment components

Power Generation

Turbine shafts
Generator components

These steels are widely selected for applications requiring high durability and mechanical strength.

Conclusion

JIS G 4053 alloy steel bars are high-performance steels designed for machine structural applications that require strength, toughness, and durability. Their excellent hardenability and resistance to wear make them ideal for critical mechanical components.

Ladhani Metal Corporation supplies JIS G 4053 alloy steel bars in multiple grades, sizes, and supply conditions, ensuring high-quality materials for automotive, engineering, and industrial manufacturing sectors.

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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