Chrome Moly JIS SCM420 Alloy Steel Bars

Name: Chrome Moly JIS SCM420 Alloy Steel Bars
Brand: JAYANT IMPEX
Price: 125.0 INR
Availability: InStock

125.0 INR/Kilograms

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Product Details:

Type Alloy Steel Bar
Tolerance h9, h10, h11 or as required
Diameter 16 mm - 250 mm
Length 1000 mm - 6000 mm
Standard JIS SCM420
Processing Annealed, Normalized, Quenched and Tempered
Grade SCM420
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Chrome Moly JIS SCM420 Alloy Steel Bars Price And Quantity

Price 125.0 INR/Kilograms
Minimum Order Quantity 1 Kilograms

Chrome Moly JIS SCM420 Alloy Steel Bars Product Specifications

Type Alloy Steel Bar
Tolerance h9, h10, h11 or as required
Diameter 16 mm - 250 mm
Length 1000 mm - 6000 mm
Material Chrome Moly Alloy Steel
Application Engineering, Automotive, Machinery, Construction
Processing Annealed, Normalized, Quenched and Tempered
Grade SCM420
Standard JIS SCM420
Finish Bright / Black / Peeled
Specific Use Gears, Shafts, Axles, Mechanical Parts
Technique Hot Rolled / Forged

Packaging Bundles, Loose, or as per customer requirement
Elongation 10%
Yield Strength 400 MPa (as per specification)
Delivery Condition As rolled / Heat treated
Surface Condition Drawn, Peeled, Turned
Density 7.85 g/cm3
Tensile Strength 620 MPa (as per specification)
Hardness 229 HB (Annealed Condition)

Product Description

JIS SCM420 is a classic chromium-molybdenum alloy steel specified under the Japanese Industrial Standards (JIS G4053).

Designed primarily as a case-hardening (carburizing) steel, SCM420 features a low carbon content (around 0.20%) combined with targeted additions of chromium and molybdenum. This chemistry makes it the ideal choice for heavy-duty components requiring a surface that can withstand massive abrasion alongside an exceptionally tough core that absorbs sudden operational impacts without snapping.

Global Equivalents

When sourcing internationally or switching manufacturing prints, SCM420 lines up directly with these prominent national standards:

USA (AISI/SAE): AISI 4120 / UNS G41200
Germany (DIN / WNr): 20CrMo4 / 1.7321
Europe (EN): 22CrMoS4 / 20CrMo4
France (AFNOR): 20CD4
China (GB): 20CrMo

Chemical Composition (Typical %)

The precise allocation of chromium provides excellent hardenability, while the molybdenum refines the grain structure to prevent core embrittlement during prolonged high-temperature carburizing cycles.

Carbon (C)	Chromium (Cr)	Molybdenum (Mo)	Manganese (Mn)	Silicon (Si)	Phosphorus (P)	Sulfur (S)
0.18% 0.23%	0.90% 1.20%	0.15% 0.30%	0.60% 0.85%	0.15% 0.35%	0.030%	0.030%

Mechanical Properties (Core Properties Post-Heat Treatment)

Because SCM420 is typically used in a case-hardened state, the bulk bar material properties are measured after quenching and tempering to represent the tough internal core supporting the hardened outer case.

Tensile Strength ( $R_m$ ): 980 MPa (N/mm)
Yield Strength ( $R_{e}$ ): 785 MPa
Elongation ( $A$ ): 14%
Reduction of Area ( $Z$ ): 40%
Impact Toughness (Charpy V-Notch): 59 J
Surface Hardness (Post-Carburization): Typically 58 62 HRC
Delivery Condition Hardness: 217 HBW (Annealed for effortless machining)

Key Technical Characteristics

Outstanding Carburizing Performance: It behaves reliably in gas, liquid, or vacuum carburizing environments, creating a highly predictable hardened case depth.
Excellent Dimensional Stability: Molybdenum ensures that complex machined geometries experience minimal distortion during the intense oil quenching phase.
Cold Shear & Workability: In its soft-annealed delivery state, SCM420 displays highly favorable cold workability, making it well-suited for cold drawing, peeling, or complex milling before undergoing the final heat-treat phase.

Common Industrial Applications

JIS SCM420 bars are widely specified across automotive drivetrain assemblies, heavy machinery, and precision power transmission setups:

Automotive Transmission: High-stress transmission gears, synchronizer sleeves, input shafts, and differential pinions.
Heavy Machinery: Hydraulic piston rods, crane pivot pins, high-torque industrial drive shafts, and universal joints.
Fasteners & Tooling: High-durability anchor bolts, case-hardened clamping hardware, and structural wear rings for industrial machinery.

High-Performance Alloy Steel Bars

SCM420 Alloy Steel Bars combine the advantages of chromium and molybdenum, delivering superior strength and durability. Prepared using hot-rolled or forged techniques, they offer consistent performance for critical mechanical applications such as gear manufacturing, shaft fabrication, and various engineering solutions.

Versatile Finishes and Processing Options

With surface conditions including drawn, peeled, turned, bright, or black, and processes such as annealing, normalizing, and quenching & tempering, these bars are customizable for specific project requirements. Their precise tolerances (h9, h10, h11) ensure a perfect fit for diverse industrial needs.

Reliable Supply Across India

As a dealer, exporter, fabricator, manufacturer, producer, retailer, supplier, and trader, we ensure timely delivery of JIS SCM420 alloy steel bars. Customer-specific packaging and delivery conditions are provided to suit varied preferences, guaranteeing quality and satisfaction for every order.

FAQ's of Chrome Moly JIS SCM420 Alloy Steel Bars:

Q: How are Chrome Moly JIS SCM420 Alloy Steel Bars processed and delivered?

A: These alloy steel bars are processed through hot rolling or forging, and are available in various finished conditions such as annealed, normalized, or quenched and tempered. Delivery is typically in bundles or loose, tailored to customer requirements, and the bars can be supplied as rolled or heat treated.

Q: What applications are suitable for SCM420 alloy steel bars?

A: SCM420 alloy steel bars are ideal for manufacturing gears, shafts, axles, and other mechanical parts due to their tough yet ductile nature. Their strength and durability make them popular in engineering, automotive, machinery, and construction industries.

Q: When should I choose JIS SCM420 steel bars over other steel types?

A: Opt for JIS SCM420 bars when your project demands a combination of high tensile strength (620 MPa) and good elongation (10%), as well as wear and impact resistance. They are particularly advantageous where reliable performance under dynamic or heavy loads is essential.

Q: Where do you supply SCM420 alloy steel bars in India?

A: We supply SCM420 alloy steel bars across India, supporting customers in all major industrial cities and regions. As dealers, suppliers, and exporters, we ensure nationwide availability, meeting the unique needs of diverse industries.

Q: What are the benefits of using SCM420 bars in construction and machinery?

A: SCM420 bars provide impressive strength, machinability, and resistance to fatigue, making them highly beneficial for demanding components in construction equipment and machinery. They enable longer service life and enhanced reliability for critical applications.

Q: What finish and size options are available for SCM420 alloy steel bars?

A: Available finishes include bright, black, peeled, drawn, and turned. Sizes range from 16 mm to 250 mm in diameter, and lengths from 1000 mm to 6000 mm, with tight tolerances (h9, h10, h11) to meet precise engineering specifications.

Q: How is the quality of SCM420 alloy steel bars ensured?

A: Strict adherence to the JIS specification guarantees consistent mechanical properties, including 229 HB hardness (annealed), 400 MPa yield, and 620 MPa tensile strength. Each batch undergoes thorough inspection and quality control to maintain product integrity.

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