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Home / News / Knowledge / Metallographic Sample Preparation Procedure for Nitrided Fasteners

Home / News / Knowledge / Metallographic Sample Preparation Procedure for Nitrided Fasteners

Metallographic Sample Preparation Procedure for Nitrided Fasteners

High-strength fasteners adopt an integrated manufacturing process: quenching & tempering base treatment plus nitriding surface strengthening. Low-temperature nitriding forms a dense white nitrided layer on thread surfaces with minimal heat treatment distortion, fully securing dimensional precision of threads.

The Role of Metallographic Testing

Metallographic analysis of nitrided threads

Metallographic testing acts as a core quality control measure across the entire fastener production workflow. It enables accurate measurement of nitrided case depth, verification of intact compound layers, and detection of heat treatment defects including porosity and denitrification.

Process parameters can be optimized via metallographic microstructure analysis, drastically improving the wear resistance and anti-seizing performance of bolts. This solution fits working conditions such as automotive chassis and general construction machinery, ensuring long-term stable service of standard high-strength fasteners.

Production Workflow & Micrograph Showcase

Nitrided fastener microstructure 1 Nitrided fastener microstructure 2

Standard Preparation Steps

  1. Rough Grinding: MET-SP P400
  2. Medium Grinding: MET-SP P800
  3. Fine Grinding: MET-SP P2000
  4. Polishing: ET-JP + 3μm PD-WT

Preparation Overview

Stage Consumable Purpose
Rough Grinding MET-SP P400 Surface Leveling
Medium Grinding MET-SP P800 Refining Scratches
Fine Grinding MET-SP P2000 Damage Removal
Polishing 3μm PD-WT Mirror Finish
#Trojan #Metallography #FastenerManufacturing #Nitriding #HeatTreatment
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