Alloy Steel 20MnCr5 Round Bar 20MnCr5 Bars 20MnCr5 Rods

Alloy Steel 20MnCr5 Round Bar 20MnCr5 Bars 20MnCr5 Rods

Name: Alloy Steel 20MnCr5 Round Bar 20MnCr5 Bars 20MnCr5 Rods
Brand: JAYANT IMPEX
Price: 75.0 INR
Availability: InStock

75.0 INR/Kilograms

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Product Details:

Grade 20MnCr5
Diameter 5 mm to 500 mm
Standard DIN 17210, EN 10084, BS970, ISO 683-1
Processing Annealed, Normalized, Hardened & Tempered
Type Round Bar, Rod, Bright Bar
Finish Black, Bright, Peeled, Polished
Specific Use Case Hardening Steel Components
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Alloy Steel 20MnCr5 Round Bar 20MnCr5 Bars 20MnCr5 Rods Price And Quantity

Minimum Order Quantity 1 Kilograms
Price 75.0 INR/Kilograms

Alloy Steel 20MnCr5 Round Bar 20MnCr5 Bars 20MnCr5 Rods Product Specifications

Processing Annealed, Normalized, Hardened & Tempered
Specific Use Case Hardening Steel Components
Technique Hot Rolled / Cold Drawn / Forged
Length 100 mm to 6000 mm (custom cut lengths available)
Application Engineering, Automobile Parts, Gears, Shafts, Industrial Machinery
Tolerance h9, h11 or as required
Material Alloy Steel 20MnCr5
Grade 20MnCr5
Diameter 5 mm to 500 mm
Finish Black, Bright, Peeled, Polished
Standard DIN 17210, EN 10084, BS970, ISO 683-1
Type Round Bar, Rod, Bright Bar

Surface Condition Smooth and defect-free
Tensile Strength 800 - 1000 MPa
Carbon Content 0.17% - 0.22%
Elongation 8% (in 5d)
Chromium Content 1.00% - 1.30%
Case Depth (on hardening) 0.5 - 2.5 mm
Yield Strength 500 MPa
Manganese Content 1.10% - 1.40%
Hardness Range 160-220 HBW (annealed), up to 58 HRC (after case hardening)
Supply Condition As rolled, Annealed, or as per requirement

Product Description

20MnCr5 (Material Number: 1.7147) is one of the most widely used chromium-manganese case-hardening steels (carburizing steels) in the global engineering and automotive industries.

Unlike the high-strength through-hardening steels (like 40NiMoCr10-5), 20MnCr5 is specifically engineered to have a relatively low core carbon content ( $0.20%$ ). This allows the material to retain excellent core toughness and ductility while its surface layer is enriched with carbon during heat treatment, yielding an incredibly hard, wear-resistant outer shell.

Here is a comprehensive breakdown of the technical properties, international standards, and processing specifications for 20MnCr5 alloy bars, round bars, and rods.

Chemical Composition (%)

The combination of manganese and chromium gives this grade excellent core strength and hardenability for a case-hardening steel, making it ideal for parts subjected to high loads and severe friction.

Element	Min (%)	Max (%)
Carbon (C)	0.17	0.22
Manganese (Mn)	1.10	1.40
Chromium (Cr)	1.00	1.30
Silicon (Si)		0.40
Phosphorus (P)		0.025
Sulfur (S)		0.035 *

* Note: Controlled sulfur variants (e.g., 20MnCrS5, 1.7149) are frequently specified with a sulfur range of 0.020% to 0.040% specifically to enhance machinability on automated CNC lines.

International Cross-Reference & Equivalents

20MnCr5 is an international standard-bearer, commonly cross-referenced with the following regional designations:

EN / DIN Standard: 20MnCr5 / 1.7147 (EN 10084)
SAE / AISI (USA): AISI 5120 (Closest chemical equivalent)
JIS (Japan): SMnC420 / SMnC420H
AFNOR (France): 20MC5
UNI (Italy): 20MnCr5

Mechanical Properties (Typical Core Values after Case Hardening)

After carburizing, quenching, and tempering, the core of a 20MnCr5 component maintains high impact resistance, while the surface achieves extreme wear resistance:

Core Tensile Strength ( $R_m$ ): $1000 - 1300 text{ MPa}$ (depending on section thickness)
Core Yield Strength ( $R_e$ ): $ge 700 - 800 text{ MPa}$
Elongation ( $A_5$ ): $ge 9%$
Typical Surface Hardness: 6063 HRC (Rockwell C) after direct or secondary hardening and low-temperature tempering.

Typical Applications

Because it perfectly balances a high-fatigue, shock-absorbing core with a glass-hard surface, 20MnCr5 round bars and rods are extensively utilized for driving mechanisms and rotating parts:

Automotive & Powertrain: Transmission gears, synchronizer rings, drive pinions, camshafts, universal joint spiders, and differential gears.
Heavy Machinery: Main drive shafts, high-load bushings, kingpins, piston pins, and splined shafts.
Clamping & Mechanical Hardware: Heavy-duty guide rods, collets, double-bolted mechanical clamps, and high-wear indexing pins.

Delivery Conditions & Machining Advice

Supply Forms: Available as hot-rolled, forged, cold-drawn, or turned bright bars.
Optimized for Machining (+TH / +FP): To prevent tool tearing and excessive wear during high-speed gear-cutting or turning, 20MnCr5 is frequently ordered in an annealed state tailored to a specific hardness range (typically 156207 HB), which guarantees an optimal ferrite-pearlite structure.
Distortion Control: Because components made from 20MnCr5 undergo intense thermal cycles during carburizing (typically at $880^circtext{C} - 980^circtext{C}$ ), it is critical to use symmetric machining practices and stress-relieving steps to minimize dimensional distortion during final oil or gas quenching.

Versatile Applications

The 20MnCr5 round bars and rods are widely utilized across a spectrum of industries, notably in the production of gears, shafts, and automotive components. Their high tensile and yield strengths, precise tolerances, and case hardening capabilities provide unmatched reliability for applications subjected to dynamic and repetitive stresses.

Precision Engineering and Surface Quality

Every 20MnCr5 alloy steel bar is crafted for exceptional dimensional accuracy, with available tolerances of h9, h11, or as needed. The bars feature a smooth, defect-free surface, supplied in finishes such as black, bright, peeled, or polished. Custom processes such as annealing, normalizing, and hardening & tempering ensure the material's performance is aligned with unique application demands.

Multiple Sizing and Processing Options

Ranging from 5 mm to 500 mm in diameter and lengths up to 6000 mm, 20MnCr5 bars can be customized to specific project needs. Various processing methods-hot rolled, cold drawn, or forged-allow for adaptability in both small and large-scale manufacturing, ensuring versatility and efficient stock management for users.

FAQ's of Alloy Steel 20MnCr5 Round Bar 20MnCr5 Bars 20MnCr5 Rods:

Q: How is the hardness of Alloy Steel 20MnCr5 round bars determined and what range can be expected?

A: The hardness of 20MnCr5 round bars depends on their condition-annealed bars typically have a hardness of 160-220 HBW, while after case hardening, hardness can reach up to 58 HRC. The specific processing route, such as annealing or hardening, will affect the final hardness profile.

Q: What are the primary applications of 20MnCr5 round bars and rods?

A: 20MnCr5 bars and rods are extensively used in engineering, automotive industries, gears, shafts, and other industrial machinery components that require both strength and the ability to undergo case hardening for wear resistance.

Q: When should I choose a hardened and tempered 20MnCr5 bar over an annealed one?

A: Choose a hardened and tempered 20MnCr5 bar when your application demands higher surface hardness and improved wear resistance, such as for gears or heavily loaded machinery parts. Annealed bars are better suited for operations where subsequent machining is required before hardening.

Q: Where are custom sizes and tolerances available for 20MnCr5 bars?

A: Custom sizes and tolerances-including diameters from 5 mm to 500 mm, lengths from 100 mm up to 6000 mm, and tolerances like h9 or h11-are available upon request from manufacturers, dealers, and suppliers across India.

Q: What is the typical process for case hardening 20MnCr5 rods?

A: Case hardening typically involves carburizing the surface of 20MnCr5 rods, followed by quenching and tempering. This results in a hardened case depth of 0.5 to 2.5 mm, delivering a hard, wear-resistant exterior while maintaining a tough, ductile core.

Q: How do the composition and mechanical properties of 20MnCr5 benefit end users?

A: With a precise balance of carbon (0.17%-0.22%), manganese (1.10%-1.40%), and chromium (1.00%-1.30%), 20MnCr5 alloy steel offers excellent hardenability and toughness. The combination of high tensile strength, predictable elongation, and customizable hardness enhances component life and performance in demanding environments.

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