– Third-party Certification
Obtain test reports from institutions such as SGS and BV. Exported products must comply
1. Dimensional Accuracy
– Use calipers and ultrasonic thickness gauges to measure outer diameter, wall thickness, and ovality, ensuring they meet tolerance requirements.
2. Mechanical Properties
– Conduct tensile tests to measure tensile strength and yield strength; hardness tests (Brinell or Rockwell) to verify the degree of work hardening.
3. Non-destructive Testing
– Eddy current testing (for surface defects), ultrasonic testing (for internal defects), and hydrostatic testing (1.5 times working pressure hold test).
4. Corrosion Resistance
– Salt spray test (e.g., ASTM B117) or intergranular corrosion test (e.g., ASTM A262) to verify material stability.
IV. Certification and Document Management
– Third-party Certification
Obtain test reports from institutions such as SGS and BV. Exported products must comply
The production department follows up on the contract to make production schedules, and workers strictly follow the production steps.
III. Key Quality Inspection Items
1. Dimensional Accuracy
– Use calipers and ultrasonic thickness gauges to measure outer diameter, wall thickness, and ovality, ensuring they meet tolerance requirements.
2. Mechanical Properties
– Conduct tensile tests to measure tensile strength and yield strength; hardness tests (Brinell or Rockwell) to verify the degree of work hardening.
3. Non-destructive Testing
– Eddy current testing (for surface defects), ultrasonic testing (for internal defects), and hydrostatic testing (1.5 times working pressure hold test).
4. Corrosion Resistance
– Salt spray test (e.g., ASTM B117) or intergranular corrosion test (e.g., ASTM A262) to verify material stability.
IV. Certification and Document Management
– Third-party Certification
Obtain test reports from institutions such as SGS and BV. Exported products must comply
Our quality control needs to be strictly managed in multiple links such as raw materials, production processes, and inspection standards. The following are the key control points and methods:
I. Raw Material Control
1. Steel Selection
– Select high-quality stainless steel billets that comply with national standards (such as GB/T 14976), American standards (ASTM A312/A269), etc. Material Test Certificates (MTC) must be provided.
– Inspect the surface of the steel billets for no cracks, inclusions, or other defects. The chemical composition must be verified by a spectrometer.
2. Supplier Audit
– Prioritize suppliers that have obtained ISO 9001 certification and regularly assess their quality stability.
II. Production Process Control
The production department follows up on the contract to make production schedules, and workers strictly follow the production steps.
III. Key Quality Inspection Items
1. Dimensional Accuracy
– Use calipers and ultrasonic thickness gauges to measure outer diameter, wall thickness, and ovality, ensuring they meet tolerance requirements.
2. Mechanical Properties
– Conduct tensile tests to measure tensile strength and yield strength; hardness tests (Brinell or Rockwell) to verify the degree of work hardening.
3. Non-destructive Testing
– Eddy current testing (for surface defects), ultrasonic testing (for internal defects), and hydrostatic testing (1.5 times working pressure hold test).
4. Corrosion Resistance
– Salt spray test (e.g., ASTM B117) or intergranular corrosion test (e.g., ASTM A262) to verify material stability.
IV. Certification and Document Management
– Third-party Certification
Obtain test reports from institutions such as SGS and BV. Exported products must comply