Step 1: Verify Certifications
Audit dual certifications of ISO 9001 & IATF 16949 (automotive-grade) to ensure robust quality control systems;

Step 2: Validate Case Studies
Require documented supply records for similar projects (e.g., high-pressure pipes must show hydropower/nuclear power project references);

Step 3: Sign Quality Guarantee
Contracts must include “zero-tolerance quality clauses” with:

• Free return/replacement for defects

• Liquidated damages ≥20% of contract value