Material Science – 20MnV6 Hard Chrome Plated Round Steel Bars (EN 10083-3, W. Nr. 1.5217)

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The Foundation of Precision and Durability in Hydraulics

The reliability of components in modern hydraulic systems and precision mechanics is crucial in the field of industrial hydraulics. High-stress parts, such as piston rods and bearing shafts, require exceptional wear resistance, corrosion resistance, and mechanical strength.

20MnV6 hard chrome plated round steel bars offer an optimal solution for these exact needs. This micro-alloyed steel (W. Nr. 1.5217), with its unique properties combined with a special hard chrome coating, guarantees the long service life and reliable operation of the components.

In this material science article, we will detail the chemical composition, mechanical properties, surface treatment details, typical applications, machinability, and sustainability aspects of 20MnV6 steel.

Standards and Designations: A Guarantee of Quality

The quality and specifications of 20MnV6 hard chrome plated round steel bars are defined by strict international and European standards, ensuring the product's reliability and compatibility in various systems:

UNI EN 10083-3: 20MnV6 micro-alloyed round steel: This is the main standard for the 20MnV6 steel grade, which belongs to the quenched and tempered steels. It specifies the material's composition and mechanical properties.
DIN EN 10204:2005-01 – 3.1 inspection certificate: This standard describes the types of inspection documents issued for metallic products. A 3.1 type certificate contains the results of the manufacturer's own tests and certifies the product's compliance with the order requirements, ensuring transparency and traceability.
UNI EN ISO 6507-1 – Vickers microhardness: This standard specifies the Vickers hardness test (HV) procedure, used to check the microhardness of surface treatments, such as the hard chrome layer. HV hardness is crucial for assessing wear resistance.
UNI EN ISO 9227 – NSS salt spray corrosion test: This standard describes the neutral salt spray (NSS) corrosion test used to evaluate the corrosion resistance of coatings. This test is essential for judging the environmental resistance of hydraulic rods.
UNI EN ISO 286-2 – geometrical tolerances: This standard defines length tolerances, diameter tolerances, and form deviations (such as straightness and roundness error) for machined parts. These parameters guarantee a precision fit.
UNI EN ISO 21920-2 – roughness measurement (Ra): This standard describes the procedures for measuring and specifying surface roughness parameters, such as Ra (average roughness). A low Ra value is essential for the long life of seals and for minimizing friction.

Introduction: The Strength of 20MnV6 Round Steels

20MnV6 is a micro-alloyed carbon-manganese round steel (W. Nr. 1.5217) primarily used for manufacturing hard chrome plated hydraulic rods and precision bearing shafts. The steel's unique composition, alloyed with vanadium and manganese, provides excellent mechanical properties and weldability.

The hard chrome coating on the surface of the rods provides outstanding wear and corrosion resistance, as well as extremely low roughness (Ra 0.15±0.05 µm), thereby significantly increasing the service life and reliability of the components. Below, we detail the material's chemical composition and mechanical properties, surface treatment details, typical applications, machinability, and sustainability aspects.

Chemical Composition and Constituent Elements

The chemical composition of 20MnV6 (1.5217) steel is strictly regulated according to the EN 10083-3 standard, which applies to micro-alloyed steels. The following table shows the typical components and their roles, which are in line with manufacturer specifications, guaranteeing the steel's quality:

Element	Content (%)	Role
Carbon (C)	0.192	Increases strength and hardness while maintaining good toughness.
Silicon (Si)	0.28	Refines structure, improves weldability and yield strength.
Manganese (Mn)	1.49	Significantly improves tensile and yield strength, contributes to toughness.
Phosphorus (P)	0.013	An impurity element; keeping it at low levels is essential to avoid brittleness.
Sulfur (S)	0.027	A manufacturing aid (improves machinability), but its quantity is limited to avoid detrimental effects.
Chromium (Cr)	0.13	Slightly increases corrosion and wear resistance, as well as heat resistance.
Vanadium (V)	0.138	Has a strong grain-refining effect, significantly increasing wear resistance and toughness.
Ni, Cu, Mo, Ti, Al, etc.	in traces	Refining and optimizing additional material properties, such as toughness and fatigue strength.

Note: The quantity of non-metallic inclusions meets the requirements, and grain size is controlled by austenitizing according to UNI EN ISO 643 / ASTM E112 standards.

Mechanical Properties

20MnV6 steel possesses excellent mechanical properties, making it suitable for high-stress applications. The following table shows typical values in accordance with manufacturer specifications, which are essential when designing hydraulic components:

Parameter	Value
Tensile Strength (Rm)	min. 651 N/mm²
Yield Strength (ReH)	min. 490 N/mm²
Elongation (A5)	24.2 %
Reduction of Area (Z)	60 % (characterizes the material's plastic deformation until fracture)
Vickers (HV1)	≥ 900 HV (This data refers to the microhardness of the hard chrome layer, not the base material.)
KV2 (J)	33 J
KV3 (J)	37 J
KV (-20 °C)	33–40 J (denotes impact strength, i.e., the material's toughness, using the Charpy V-notch test at various temperatures.)

Surface Treatment and Characteristic Data

20MnV6 round steel bars are typically coated with a hard chrome layer, which significantly improves the component's performance and lifespan. The surface treatment, coating characteristics, and test data are as follows:

Microhardness (EN ISO 6507-1): ≥ 900 HV. This high hardness value ensures excellent wear resistance.

Layer Thickness: 25 ± 5 µm. This thickness provides adequate protection and durability in hydraulic applications.

Roughness (EN ISO 21920-2): Ra 0.15 ± 0.05 µm. The low roughness contributes to reducing friction and increasing the lifespan of seals.

Corrosion Test (NSS, EN ISO 9227): 5% salt solution, 35 °C, 200 h → R9 rating (ISO 10289). This result indicates excellent corrosion resistance in a salt spray environment, which is critically important for hydraulic systems.

Geometrical Tolerances (ISO 286-2): Strict control of diameter tolerance, straightness error (max. 0.3 mm/m), and roundness error (max. 50%) ensures the dimensional accuracy required for precision applications.

Note: The coating is Cr6-free, which represents an environmentally friendly technology and complies with modern environmental regulations, highlighting the commitment to sustainability.

Application Areas

20MnV6 hard chrome plated round steel bars are widely used in areas where high wear resistance, corrosion resistance, and mechanical strength are required, especially in the fields of hydraulics and mechanical engineering:

Piston rods, hydraulic cylinders: Especially in systems with high cyclical stress, where surface quality and wear resistance are critical. These parts form the heart of hydraulic cylinders.

Bearing housings, rolling and plain bearings: For manufacturing precise shafts and bearing components where the excellent quality of the round steel bars is essential.

Eccentric shafts, precision mechanics: Machine elements requiring high accuracy and durability.

Pipeline components: Components where surface wear resistance is of paramount importance.

Machinability

Machining 20MnV6 steel and its hard chrome coating requires special considerations for maximum efficiency and quality:

Cutting: For carbide lathes, a feed rate of 0.15 mm/revolution is recommended for efficient and clean cutting.

Turning/Milling: Use inserts specifically designed for hard metals and ensure adequate cooling to minimize tool wear and maintain surface quality.

Welding: The base material is weldable, but the hard chrome coating must be removed from the weld area before welding. The use of special coating-welding procedures is recommended.

Sustainability and Recycling

The 20MnV6 base material, like all steel, is 100% recyclable. After the coating is removed, the steel scrap can be re-melted and recycled in steel production, thus contributing significantly to the circular economy, resource conservation, and the reduction of environmental impact. This property highlights the environmentally friendly nature of steel and the commitment to sustainability.

Get Your 20MnV6 Hard Chrome Plated Round Steel Bars from Hidraulika Store!

20MnV6 hard chrome plated round steel bars are an ideal choice for any hydraulic or mechanical engineering application where durability, precision, and outstanding wear resistance are essential requirements. Whether for piston rods, hydraulic cylinder parts, or precision mechanical components, 20MnV6 ensures long-term, reliable operation.

Don't let a lack of quality affect the performance of your systems! Browse our range of chrome plated round steels in our webshop at hidraulikastore.com, where you will find a wide selection of 20MnV6 hard chrome plated round steel bars! As a reliable hydraulic specialty store, we offer a wide variety of rod sizes. Our expert team is available in Budapest (in person) and online to help you select the hydraulic parts that best suit your needs, with guaranteed quality.

Choose quality hydraulic solutions and ensure the long-term, flawless operation of your systems!

Click here to view the 20MnV6 chrome plated round steels: Chrome Plated Round Steels - 20MnV6 - Rods - Hidraulika Store - Hydraulics and Pneumatics or contact us today!

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English

Material Science – 20MnV6 Hard Chrome Plated Round Steel Bars (EN 10083-3, W. Nr. 1.5217)

The Foundation of Precision and Durability in Hydraulics

Table of Contents

Standards and Designations: A Guarantee of Quality

Introduction: The Strength of 20MnV6 Round Steels