Hard Chrome Plated Bars

Name: Hard Chrome Plated Bars
Brand: JAYANT IMPEX
Price: 317400.0 INR
Availability: InStock

317400.0 INR/Tonne

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Product Details:

Tolerance f7, h8, h9 (as per customer requirement)
Length Up to 6 Meters (customized on request)
Standard ASTM A276, DIN 10100, EN 10083
Application Hydraulic and Pneumatic Cylinders, Industrial Machinery
Type Round Bar
Specific Use Piston Rods, Linear Motion Shafts
Processing Peeling, Grinding, Polishing, Hard Chrome Plating
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Hard Chrome Plated Bars Price And Quantity

Price 317400.0 INR/Tonne
Minimum Order Quantity 1 Tonne

Hard Chrome Plated Bars Product Specifications

Type Round Bar
Specific Use Piston Rods, Linear Motion Shafts
Tolerance f7, h8, h9 (as per customer requirement)
Length Up to 6 Meters (customized on request)
Application Hydraulic and Pneumatic Cylinders, Industrial Machinery
Standard ASTM A276, DIN 10100, EN 10083
Finish Mirror Polished, Hard Chrome Plated
Processing Peeling, Grinding, Polishing, Hard Chrome Plating
Material Steel (with Hard Chrome Plating)
Technique Cold Drawn, Centerless Ground, Hard Chrome Plated
Diameter 6 mm to 200 mm
Grade EN8D, C45, CK45, SAE 1045, EN19, AISI 4140

Packing Plastic Covering with Wooden Crates or Bundles
Yield Strength Up to 700 MPa (Depending on Grade)
Corrosion Resistance High (due to Superior Chrome Layer)
Chrome Thickness 20-25 Microns
Roundness 0.01 mm
Surface Hardness 850-1150 HV (Vickers Hardness)
Straightness 0.2mm/1000mm
Ultimate Tensile Strength Up to 900 MPa (Depending on Grade)

Product Description

Technical Overview & Key Features

Hard Chrome Plated Bars (Rods) are carbon or alloy steel shafts electroplated with a micro-thin layer of chromium to achieve high wear resistance, low friction, and corrosion resistance.

Low Friction Coefficient: Typically around 0.150.20 (dry vs. steel), extending seal and bearing life in dynamic sliding applications.
Micro-Cracking Structure: Plating processes intentionally incorporate fine micro-cracks (300800 cracks/cm) to retain lubricants and enhance sliding wear resistance.
Surface Hardness: The electrodeposited chrome layer yields 8501150 HV0.1 (equivalent to 6572 HRC), far exceeding standard hardened base steels.

Plating Layer & Surface Specifications

Specification	Standard Grade	Induction Hardened Grade	Heavy-Duty / Marine Grade
Plating Thickness	20 30 m	20 30 m	40 50 m (or Double Chrome)
Plating Hardness	850 1150 HV0.1	850 1150 HV0.1	900 1150 HV0.1
Surface Roughness (Ra)	0.10 0.20 m	0.10 0.20 m	0.05 0.15 m
Induction Depth	N/A	1.0 3.5 mm	Optional
Subsurface Hardness	Base material core	54 60 HRC	Base material core
Salt Spray (ISO 9227)	NSS 120 200 Hours	NSS 120 200 Hours	NSS 500 1000 Hours

Base Material Chemical Comparison

Grade	Carbon (C)	Manganese (Mn)	Silicon (Si)	Chromium (Cr)	Molybdenum (Mo)	Vanadium (V)
1045 / C45E	0.42 0.50	0.60 0.90	0.15 0.35	-	-	-
4140 / 42CrMo4	0.38 0.45	0.60 0.90	0.15 0.35	0.90 1.20	0.15 0.30	-
20MnV6	0.16 0.22	1.30 1.70	0.10 0.50	-	-	0.08 0.20
316L (SS)	0.03 max	2.00 max	0.75 max	16.0 18.0	2.00 3.00	-

Mechanical Properties by Core Grade

Core Grade	Condition	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Core Hardness (HB)
AISI 1045	Cold Drawn / Normalized	Min 350	600 750	Min 14	180 230
AISI 4140	Quenched & Tempered (Q+T)	Min 650	850 1000	Min 12	260 320
20MnV6	Cold Drawn	Min 450	600 750	Min 12	180 230
AISI 316L	Annealed / Cold Worked	Min 290	580 800	Min 30	160 210

Tolerances & Supply Range

Diameter Range: 6 mm to 250 mm (Metric) | 1/4" to 10" (Imperial)
Standard Dimensional Tolerances: ISO f7, f8, h7, h8
Straightness Tolerance: Max 0.2 mm / 1000 mm (0.02%)
Out-of-Roundness (Ovality): Max 50% of the diameter tolerance range
Standard Stock Lengths: 3000 mm to 7500 mm

Processing Steps

Precision Centerless Grinding: Base bar is ground to exact OD tolerances and target surface finish.
Induction Hardening (Optional): High-frequency heating creates a hard outer casing beneath the surface to prevent denting from severe impacts.
Polishing: Pre-plating superfinish polishing to ensure consistent surface topology.
Hard Chrome Electroplating: Submerged in a chromic acid bath ( $CrO_3$ ) under precise voltage/current density.
Post-Plating Superfinishing: Micro-polishing to achieve target $Ra le 0.20,mutext{m}$ .

Premium Surface and Structural Integrity

Engineered through advanced cold drawing, centerless grinding, and hard chrome plating, these bars achieve a mirror-like finish and outstanding straightness. Rigorous processing-including peeling, grinding, and polishing-ensures minimal tolerance deviation and consistent roundness, making them ideal for precision engineering applications.

Superior Performance and Versatile Applications

With a surface hardness of 850-1150 HV and high corrosion resistance, these bars meet the demanding requirements of hydraulic and pneumatic cylinders, piston rods, and linear motion shafts. Their strength, durability, and adherence to international standards guarantee reliable performance in industrial settings.

FAQ's of Hard Chrome Plated Bars:

Q: How are hard chrome plated bars manufactured to achieve such high hardness and precision?

A: Hard chrome plated bars are produced using a combination of cold drawing, centerless grinding, peeling, polishing, and hard chrome plating. This meticulous process results in a surface hardness of 850-1150 HV (Vickers), mirror finish, and high straightness (0.2mm/1000mm), ensuring excellent performance for precision applications.

Q: What are the primary applications of these hard chrome plated bars?

A: These bars are primarily used as piston rods in hydraulic and pneumatic cylinders, linear motion shafts, and in various industrial machinery components where high strength, wear resistance, and minimal surface friction are crucial.

Q: When should I choose hard chrome plated bars over standard steel bars?

A: Hard chrome plated bars are recommended when your application demands enhanced surface hardness, improved corrosion resistance, high dimensional accuracy, and a superior finish-especially in environments that involve repetitive motion, exposure to moisture, or abrasive conditions.

Q: Where are these bars typically supplied and by whom in India?

A: In India, these bars are available from a comprehensive network of dealers, exporters, fabricators, manufacturers, producers, retailers, suppliers, and traders. They are widely distributed to serve the hydraulic, pneumatic, and industrial machinery sectors.

Q: What is the process for customizing bar length, diameter, or tolerance?

A: Customization is available upon request. Bars can be supplied in lengths up to 6 meters, with diameters from 6 mm to 200 mm. Tolerances such as f7, h8, and h9 can be tailored as per customer requirements to suit specific engineering applications.

Q: How does the hard chrome plating enhance the corrosion resistance of these bars?

A: The dense chrome layer-20 to 25 microns thick-acts as a protective barrier, significantly improving corrosion resistance. This makes the bars particularly suitable for use in environments with high moisture, chemicals, or where resistance to rust and wear is essential.

Q: What benefits do these bars offer for use in hydraulic and pneumatic systems?

A: The bars provide high strength (up to 700 MPa yield strength), exceptional wear and corrosion resistance, precision roundness, and a low-friction surface. These properties reduce maintenance, increase service life, and improve overall efficiency in hydraulic and pneumatic applications.

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