INDUSTRY COMPONENT

Surface Layer

Surface layer of cold-forged steel bar stock providing corrosion resistance, wear protection, and dimensional stability.

View Specifications

Component Specifications

Definition
The surface layer is a critical component of cold-forged steel bar stock, consisting of a treated outer region that enhances material properties through processes like shot peening, coating, or heat treatment. It serves as the interface between the core material and external environment, providing protection against corrosion, reducing friction, improving fatigue resistance, and maintaining dimensional accuracy in industrial applications.
Working Principle
The surface layer functions through metallurgical modification or applied coatings that create a barrier against environmental factors and mechanical wear. It operates by forming a hardened zone through work hardening during cold forging, supplemented by surface treatments that alter microstructure or add protective layers to prevent oxidation, reduce friction coefficients, and enhance load-bearing capacity.
Materials
Low-carbon or alloy steel base with surface modifications including: zinc phosphate coatings (5-15 μm), black oxide finishes (0.5-2.0 μm), electroplated zinc (8-25 μm), or nitrided surfaces (0.1-0.5 mm case depth). Core material typically AISI 1018, 1045, or 4140 steel.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Roughness (Ra)0.4-1.6 μm
Surface Hardness45-65 HRC
Adhesion Strength≥4B per ASTM D3359
Coating Thickness5-25 μm
Corrosion Resistance72-500 hours salt spray

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 9227, ISO 1463, ASTM B117, DIN 50961

Parent Products

This component is used in the following industrial products

Cold-Forged Steel Bar Stock

Semi-finished steel bar produced through cold forging for precision metalworking

View Product Details

Ergonomic Floor Matting

Ergonomic floor matting for assembly stations, reducing fatigue and improving comfort.

View Product Details

Flooring

The horizontal surface that forms the base of a cabin interior, providing structural support and a walking surface.

View Product Details

Engineering Analysis

Risks & Mitigation
  • Coating delamination under thermal cycling
  • Inconsistent thickness affecting dimensional tolerances
  • Hydrogen embrittlement from plating processes
  • Surface contamination compromising adhesion
FMEA Triads
Trigger: Inadequate surface preparation before coating
Failure: Coating delamination and accelerated corrosion
Mitigation: Implement strict cleaning protocols (degreasing, pickling, activation) and adhesion testing per ASTM standards
Trigger: Excessive coating thickness
Failure: Dimensional interference in precision assemblies
Mitigation: Implement statistical process control for coating thickness and regular gauge calibration

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
±0.005 mm for coating thickness, ±0.01 mm for surface roughness
Test Method
Coating thickness measured by eddy current or magnetic induction per ISO 2178, adhesion tested by cross-cut test per ISO 2409, corrosion resistance evaluated by salt spray test per ISO 9227

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Surface Layer

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Hebei Yongchang Composite Material Technology Co., Ltd.
Hebei, CN
Also makes: Water Collection Tank, Collection Tank, Storage Tank and 5 more
Listed on the company's own website · profile compiled by CNFX from public sources
View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Related Components

Valve Body
Valve body is the main structural housing of a molten metal flow control valve, designed to withstand extreme temperatures and corrosive environments while directing metal flow.
Refractory Liner
Refractory liner for molten metal flow control valves, providing thermal insulation and erosion resistance in extreme temperature applications.
Work Rolls
Work rolls are precision cylindrical components in heavy-duty rolling mills that directly contact and deform metal during rolling operations.
Venting Channels
Venting channels are precision-engineered passages in metal casting mold cores designed to allow gases to escape during the molten metal pouring process, preventing defects and ensuring high-quality castings.

Frequently Asked Questions

What is the primary function of the surface layer in cold-forged steel bar stock?

The surface layer primarily provides corrosion protection, reduces friction during machining or assembly, improves fatigue resistance through compressive stress induction, and maintains dimensional stability by preventing surface degradation.

How does surface treatment affect the mechanical properties of steel bar stock?

Surface treatments increase surface hardness (typically 2-3 times core hardness), improve wear resistance by 30-50%, enhance fatigue life through compressive residual stresses, and provide chemical barrier protection without significantly affecting core ductility or strength.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Request Manufacturing Insight for Surface Layer

Thank you. Your request has been sent. We'll respond within 1–3 business days.
Sorry, we couldn't send your message. Please try again, or email us at contact@cnfx.com.
Zinc Coating
Get QuotesChat