Quality Assurance & Testing Inspection

• Zero-Defect Commitment, Precision Testing Equipment, and 100% Traceable Mill Test Certificates (EN 10204 3.1) from Wuxi, China.

1. Overview

Uncompromising Quality Standards in Every Single Shipment

At Qiaodi Steel, quality is not an afterthought—it is embedded into every stage of our supply chain. Based in Wuxi, the core hub for China’s stainless steel industry, we enforce strict quality management protocols aligned with ISO 9001:2015 and major international standards (ASTM, ASME, EN, DIN, and JIS).

Whether supplying prime stainless steel raw materials, standard piping components, or high-precision custom OEM fabrications, every batch undergoes comprehensive chemical, mechanical, dimensional, and surface inspections before dispatch.

2. Our 4-Stage Inspection Framework

• 01 / Incoming Quality Control (IQC)
  • Raw Material Verification: Every incoming coil, sheet, pipe, or bar from raw material mills (TISCO, BAOSTEEL, ZPSS) undergoes immediate PMI spectral analysis to verify chemical composition.
  • Visual & Physical Checks: Surface defect screening, edge quality inspection, and raw plate thickness measurement.
• 02 / In-Process Quality Control (IPQC)
  • Real-Time Machining Audits: Continuous dimensional checking during laser cutting, CNC turning/milling, bending, and welding.
  • GD&T Adherence: Tight tolerance monitoring against client-supplied 3D CAD models (STP/STEP) and 2D engineering drawings (DWG/PDF).
• 03 / Final Quality Control (FQC)
  • 100% Dimensional & Surface Check: Thread pitch verification with Go/No-Go gauges, roughness tests ($Ra$), and optical comparator dimensional verification.
  • Pressure & Integrity Testing: Hydrostatic, pneumatic, and non-destructive testing (NDT) for pipes, fittings, and pressure-bearing weldments.
• 04 / Outgoing Quality Control (OQC)
  • Packaging & Export Protection: Anti-corrosion wrapping, custom foam inserts, seaworthy wooden box packing, and container loading supervision.

4. Testing Equipment & Laboratory Capabilities

• Chemical Element Analysis
  • Equipment: Portable PMI Spectrometer (Optical Emission Spectrometry / XRF Analyzer).
  • Function: Instant non-destructive chemical element verification (Cr, Ni, Mo, C, Mn, S, P) to prevent material mix-ups.
• Dimensional & Geometrical Inspection
  • Equipment: CMM (Coordinate Measuring Machine), Optical Comparators, Digital Height Gauges, Micrometers, and Thread Gauges.
  • Function: High-precision 3D spatial measurement down to $\pm 0.005\text{ mm}$ for complex custom machined parts.
• Mechanical Property Testing
  • Equipment: Universal Tensile Testing Machine, Hardness Testers (Rockwell HRC, Brinell HB, Vickers HV).
  • Function: Verifying yield strength, tensile strength, elongation percentage, and surface/core hardness.
• Non-Destructive Testing (NDT) & Pressure Integrity
  • Equipment: Ultrasonic Thickness Gauges, Liquid Penetrant Inspection (PT) Kits, Hydrostatic Testing Rigs.
  • Function: Detecting internal cracks, weld seam voids, wall thickness uniformity, and zero-leak pressure performance.

4. Material Documentation & Traceability

Headline: 100% Traceability & Compliance Documentation

We guarantee full material transparency for every order shipped out of our facility:

• EN 10204 3.1 Mill Test Certificate (MTC): Issued with every shipment, confirming raw material heat numbers, chemical heat analysis, mechanical tensile/yield test results, and heat treatment status.
• Third-Party Inspection (TPI) Support: We fully support independent third-party inspections arranged by clients, including SGS, TÜV Rheinland, Bureau Veritas (BV), and Intertek.
• Compliance Certificates: Certificate of Origin (CO, Form E, Form F), RoHS/REACH compliance documentation available upon project request.

5. Call to Action

• Need Custom Quality Testing or MTC Documentation for Your Project?
• Contact our quality control engineers today to discuss your technical tolerance requirements, inspection protocols, or sample testing.