合格证书
Certificate of Quality
材质化验单
Material Test Sheet
材质证明
Material Quality Certificate
Cettificate of Qualification 和 Certificate of Competency 都是指（人的）资质证书，我想问者这里指的是材料。
Certificate of competency 合格证书
Material laboratory test report 材质化验单
Certificate of Qualification
Certificate of Material Quality Analysis
合格证应该是Certification of Compliance或者Quality Certification
Certificate of Qualification
Analysis Sheet of Quality of Material