Alloy Steel 20X2H4A Round Bar 20X2H4A Bars 20X2H4A Rods

Alloy Steel 20X2H4A Round Bar 20X2H4A Bars 20X2H4A Rods

Name: Alloy Steel 20X2H4A Round Bar 20X2H4A Bars 20X2H4A Rods
Brand: JAYANT IMPEX
Price: 98.0 INR
Availability: InStock

98.0 INR/Kilograms

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Product Details:

Technique Hot Rolled / Forged / Cold Drawn
Length Random, Cut to Length, 3-6 Meters or as required
Application Industrial, Construction, Engineering, Machinery
Material Alloy Steel 20X2H4A
Specific Use Shafts, Fasteners, Gears, Components
Grade 20X2H4A
Finish Bright, Black, Peeled, Polished
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Alloy Steel 20X2H4A Round Bar 20X2H4A Bars 20X2H4A Rods Price And Quantity

Price 98.0 INR/Kilograms
Minimum Order Quantity 1 Kilograms

Alloy Steel 20X2H4A Round Bar 20X2H4A Bars 20X2H4A Rods Product Specifications

Diameter 10mm to 400mm
Material Alloy Steel 20X2H4A
Type Round Bar / Rod
Tolerance h9, h11 or as specified
Grade 20X2H4A
Specific Use Shafts, Fasteners, Gears, Components
Finish Bright, Black, Peeled, Polished
Technique Hot Rolled / Forged / Cold Drawn
Application Industrial, Construction, Engineering, Machinery
Length Random, Cut to Length, 3-6 Meters or as required
Processing Annealed, Quenched & Tempered, Normalized
Standard DIN, ASTM, BS, JIS, GOST

Surface Condition Smooth, Free from scale
Delivery Condition Heat Treated; Annealed / Hardened & Tempered
Packaging Bundles or as required
Density ~7.85 g/cm3
Test Certificates Provided
Alloying Elements Nickel, Chromium, Molybdenum
Shape Round
MOQ As per agreement
Hardness As per standard or customer requirement

Product Description

20X2H4A or 20H2N4A) is a premium, high-quality Russian GOST standard (GOST 4543) chrome-nickel alloy structural steel designed primarily for case-hardening (carburizing).

Characterized by its exceptionally high Nickel (~3.5%) and Chromium (~1.5%) content, it is engineered for heavy-duty components that require extreme surface hardness (up to 60+ HRC after carburizing and heat treatment) combined with outstanding core toughness, fatigue strength, and deep hardenability in large cross-sections.

Technical Specifications & Chemical Composition

The "A" at the end of the GOST designation signifies a high-quality steel with strict limits on impurities like phosphorus and sulfur, which maximizes impact toughness and minimizes embrittlement.

Chemical Composition (Weight % per GOST 4543)

Element	Carbon (C)	Silicon (Si)	Manganese (Mn)	Chromium (Cr)	Nickel (Ni)	Phosphorus (P)	Sulfur (S)	Copper (Cu)
Min	0.16%	0.17%	0.30%	1.25%	3.25%
Max	0.22%	0.37%	0.60%	1.65%	3.65%	0.025%	0.025%	0.30%

Mechanical Properties (Quenched & Tempered Core Properties)

Even before case-hardening, the core of a 20X2H4A round bar retains extraordinary yield strength and fracture toughness, resisting heavy shock loads without catastrophic failure.

Typical Mechanical Characteristics (Tested on 15 mm section)

Property	Value
Tensile Strength	1270 MPa
Yield Strength	1080 MPa
Elongation ( $A_5$ )	9%
Reduction of Area ( $psi$ )	45%
Impact Toughness (KCU)	78 $text{J/cm}^2$
Core Hardness (Annealed state)	269 HBW
Surface Hardness (Post-Carburizing & Heat Treatment)	57- 64 HRC

Global Cross-Reference Equivalents

When sourcing materials across global projects, 20X2H4A aligns closely with heavy-duty nickel-chrome case-hardening grades:

USA (AISI/SAE): AISI E3316 / SAE 3316
Europe (EN / DIN): 18NiCrMo14-6 / 1.3533 / 17NiCrMo14
China (GB/T): 20Cr2Ni4A
France (AFNOR): 18NiCrMo14 / F-1556

Heat Treatment Guidelines

20X2H4A is a highly responsive steel requiring careful thermal management to achieve its optimum dual-phase properties (hard case, ultra-tough core):

Forging / Hot Rolling: 1220 850C
Normalizing: 860 880C (air cooling)
Soft Annealing: 640C - 680C (to lower hardness below 269 HBW for easier machining)
Carburizing Temperature: 870C 950C
Double Hardening Cycle (Recommended for ultimate grain refinement):
1. First Quench: Heat to 845 C 875C, quench in oil. (Refines the core)
2. Second Quench: Heat to 760 C -800C, quench in oil. (Refines the carbon-rich case)
Low-Temperature Tempering: 150C 210C (relieves internal quenching stresses while retaining maximum surface HRC)

Key Applications of 20X2H4A Round Bars & Rods

Because it retains high core performance across large section diameters, 20X2H4A round bars are primarily chosen for heavy machinery, aerospace, and defense applications involving severe stress, impact, and wear friction:

Heavy-Duty Transmission Gears: Large sprockets, bevel gears, planetary pins, and ring gears for mining equipment and heavy trucks.
High-Stress Shafts: Main drive shafts, multi-diameter turbine shafts, crankshafts, and heavy-duty industrial axles.
Aerospace & Defense: Highly loaded fasteners, engine connecting rods, rocker arms, and structural pins in aircraft framing.
Machinery Components: Highly wear-resistant bushings, piston pins, and cold-working dies where surface indentation cannot be tolerated.

Processing Note: Due to its chemical profile and susceptibility to air-hardening cracks, 20X2H4A is not considered weldable. Components should be joined via mechanical means, or structural welding should be strictly avoided.

Versatile Alloy Steel 20X2H4A Round Bars for Demanding Applications

Our Alloy Steel 20X2H4A Round Bars and Rods are engineered for versatility and reliability. Tailored to meet rigorous quality standards, they cater to sectors such as construction, industrial machinery, and engineering. Available in multiple finishes and processed according to customer needs, these bars offer outstanding strength and hardness thanks to precise alloying and heat treatments.

Customizable Sizes and Finishes to Suit Every Project

With a broad diameter range from 10mm to 400mm and length options from 3-6 meters or custom cuts, Alloy Steel 20X2H4A products can be tailored precisely for your requirements. Multiple surface conditions such as bright, black, peeled, or polished, alongside tolerance settings h9 or h11, ensure perfect fit and functionality in shafts, fasteners, gears, and more.

FAQ's of Alloy Steel 20X2H4A Round Bar 20X2H4A Bars 20X2H4A Rods:

Q: How are Alloy Steel 20X2H4A round bars processed to achieve optimal performance?

A: These round bars undergo heat treatment processes such as annealing, quenching and tempering, or normalization, as per customer or standard requirements. This enhances their mechanical properties, durability, and ability to perform under demanding industrial conditions.

Q: What applications are Alloy Steel 20X2H4A rods and bars suitable for?

A: These rods and bars are widely used in industrial machinery, construction, engineering, and component fabrication such as shafts, fasteners, and gears, owing to their excellent strength, hardness, and resistance to wear.

Q: When are test certificates provided for Alloy Steel 20X2H4A round bars?

A: Test certificates are provided with every order upon delivery, ensuring that each batch meets the required quality and specification standards.

Q: Where are Alloy Steel 20X2H4A round bars commonly supplied from in India?

A: These bars can be sourced from reputable dealers, exporters, fabricators, manufacturers, producers, retailers, suppliers, and traders based across major industrial hubs in India.

Q: What is the typical surface and finish of these alloy steel round bars?

A: The surface condition is smooth and free from scale, with available finishes including bright, black, peeled, or polished, as required by client specifications.

Q: How is the packaging and minimum order quantity (MOQ) decided for these products?

A: Packaging is usually done in secure bundles or as specified by the customer, and minimum order quantity is determined based on mutual agreement between the supplier and client.

Q: What benefits do Alloy Steel 20X2H4A round bars offer in engineering applications?

A: They provide high strength, excellent toughness, dimensional precision, and adaptability to various treatments, making them ideal for components exposed to mechanical stress or requiring durability and wear resistance.

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