INDUSTRY COMPONENT

Surface Layer

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

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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
  • Roughness (Ra) 0.4-1.6 μm
  • Surface Hardness 45-65 HRC
  • Adhesion Strength ≥4B per ASTM D3359
  • Coating Thickness 5-25 μm
  • Corrosion Resistance 72-500 hours salt spray
Standards
ISO 9227, ISO 1463, ASTM B117, DIN 50961

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Surface Layer.

steel surface treatment cold forging surface layer corrosion resistant coating metal bar stock finish industrial surface hardening protective coatings wear resistance treatment Surface Layer Surface Layer in Basic Metal Manufacturing

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

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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

Interchangeable Parts

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

Buyer Feedback

★★★★☆ 4.6 / 5.0 (15 reviews)

"The Surface Layer we sourced perfectly fits our Basic Metal Manufacturing production line requirements."

"Found 23+ suppliers for Surface Layer on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Surface Layer is very thorough, especially regarding technical reliability."

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Surface Finish Layer Surface Oxide Layer