Premium Steel Pipes

How many quality control (QC) checks are required for premium steel pipes before dispatch?

 

1.Raw material inspection for round steel

 

Incoming Inspection of Round Bars: We strictly match each procurement batch by verifying Material Test Certificates (MTC) against heat numbers, lengths, diameters, and surface conditions. This ensures full traceability to prevent material mixing at the source and guarantees that no sub-standard materials are used.

 

2.Wall Thickness Variation Inspection of Pierced Hollows

 

During the piercing process, we inspect the wall thickness variation and surface quality of the hollow shells. If any issues such as out-of-tolerance dimensions or guide shoe marks are detected, immediate adjustments are made.

 

3.Dimensional & Surface Inspection for Pierced Hollows

 

Inspect dimensions and surface quality after cooling to ensure the hollow shells meet quality standards.

 

4.IPQC (In-Process Quality Control)

 

IPQC & Sampling: For every process—including annealing, pickling, cold drawing, and cold rolling—inspections for size, surface integrity, and mechanical properties are mandatory. Each batch requires trial production and sign-off by the shift leader prior to full-scale manufacturing.

 

5.Dimensional Inspection of Finished Pipes

 

100% Finished Product Inspection: Every single pipe undergoes end-cropping and a thorough inspection of dimensions and surface integrity. This "piece-by-piece" process is our final quality gate before dispatch to ensure zero defects.

 

6.Mechanical Property Testing：Tensile Strength，Yield Strength，Elongation，Flattening Test，Hardness Testing

 

Mechanical Property Testing: For steel pipes with specific performance requirements, we conduct tests for tensile strength, yield strength, elongation, and hardness. Prior to mass production, a pilot test is performed, and full-scale manufacturing only begins once the results are qualified. Furthermore, sampling inspections are carried out on finished products before dispatch to ensure all requirements are consistently met.

 

7.Eddy Current Testing

 

For fluid pipes with a wall thickness of less than 3mm, 100% Eddy Current Testing (ECT) is performed to detect surface defects.

 

These are the essential inspection steps for premium steel pipes. For products requiring high surface integrity, we exercise extra care at every stage of the QC process to ensure that only the finest pipes reach our customers.

 

Shanghai ShengQiu Materials Co., Ltd

WhatsApp: 008613761124029

Email: sales@sqsteelpipe.com

Website: www.sqsteelpipe.com