Carbon steel casting

steelmedium seriesfor metal fabrication

Overview

Hansheng provides integrated steel surface treatment services coordinated with precision CNC machining to deliver surface protection, mechanical strengthening and aesthetic finishes for carbon and alloy steels. Processes are adapted for both precision components (gears, shafts, threaded parts) and heavy structural parts.

Main service categories and examples:

• Surface Preparation & Pre-treatment: sandblasting & shot blasting; polishing & buffing.
• Corrosion Protection & Plating: zinc electroplating; hot-dip galvanizing; electroless nickel plating.
• Chemical Conversion Coatings: black oxide (blackening/bluing); phosphating (manganese/zinc phosphate).
• Surface Hardening & Wear Resistance: hard chrome plating; carburizing and nitriding.
• Organic Coatings & Aesthetics: powder coating; liquid painting.

Comparison of common steel treatments (process details):

• Black Oxide — Typical thickness: less than 1 µm; Corrosion resistance: low (indoor use); Abrasion/wear resistance: low; Main characteristic: no dimensional change, reduces glare; Cost: low.
• Zinc Plating (Electroplating) — Typical thickness: 5–15 µm; Corrosion resistance: medium (indoor/mild environments); Abrasion/wear resistance: low; Main characteristic: sacrificial protection, bright appearance; Cost: low–medium.
• Electroless Nickel Plating — Typical thickness: 5–50 µm (uniform); Corrosion resistance: high; Abrasion/wear resistance: high; Main characteristic: uniform coverage on complex shapes (threads, internal holes); Cost: high.
• Hard Chrome Plating — Typical thickness: 10–500 µm; Corrosion resistance: medium; Abrasion/wear resistance: very high; Main characteristic: extreme hardness, low friction; Cost: medium–high.
• Hot-Dip Galvanizing — Typical thickness: 50–100 µm; Corrosion resistance: very high (outdoor); Abrasion/wear resistance: medium; Main characteristic: thick, rugged coating for harsh exteriors; Cost: medium.
• Powder Coating — Typical thickness: 60–120 µm; Corrosion resistance: high; Abrasion/wear resistance: medium; Main characteristic: decorative, impact resistant; Cost: medium.

Quality assurance and process integration:

• Integration with CNC machining workflow to control pre‑plating dimensions and compensate for coating thickness.
• Pre-process checks: verification of surface roughness and dimensions prior to coating.
• Post-process verification: measurement of coating thickness and dimensional checks using gear inspection machines and CMMs (coordinate measuring machines); additional inspections such as radiography for internal quality control.
• Engineering consultancy to select the appropriate treatment balancing cost, performance and lead time for each application.