Quality you can verify on site. Yesterday at our warehouse, our long-term client arrived in person to inspect a freshly produced batch of 304L stainless steel pipes. The client — alongside our QC team — measured outer diameter with a steel tape and wall thickness with a digital vernier caliper. Every dimension came back qualified, and the goods were signed off for shipment.

What Was Inspected

• Outer Diameter (OD) measured across the pipe end with a steel measuring tape.
• Wall Thickness measured with a digital vernier caliper on a cut edge.
• Surface finish, end squareness and packaging reviewed by both parties.

Inspection Results at a Glance

The numbers below were captured live on site. No retouching, no marketing fluff — just the readings off the caliper and the tape.

Why We Invite Clients to Inspect on Site

Trust is the most expensive thing in cross-border steel trade — and also the easiest to lose. We don’t just say our 304L pipes are within tolerance. We open the warehouse door and let you measure them yourself.

• Independent on-site inspection by your own team or third-party (SGS / BV / TÜV) is welcome.
• Mill Test Certificates (EN 10204 3.1) provided with every shipment.
• Real photos & videos before container loading — sent within 24 hours.
• After-sales claim response within 48 hours if any discrepancy is reported.

About This Batch

304L (UNS S30403 / 1.4307) is the low-carbon version of 304 stainless steel. With its carbon content kept below 0.03%, it offers excellent resistance to intergranular corrosion after welding — making it the go-to choice for food, dairy, beverage, pharmaceutical, and chemical process piping.

Specifications covered by this batch:

• Standard: ASTM A312 / ASME SA312, equivalent GB/T 14976
• Process: Seamless hot-rolled, solution annealed, pickled
• Outer Diameter: ~530 mm (customizable)
• Wall Thickness: ~30 mm range (confirmed on site)
• Length: 6 m standard, cut-to-length on request
• Surface: Pickled & passivated, annealed bright

Plan Your Own Visit — Or Send a Third-Party Inspector

If you are an importer, EPC contractor, or trading company sourcing 304L stainless steel pipes for an upcoming project, we welcome you to visit our factory and warehouse in China. We can also arrange a live video walk-through if travel is not convenient. Send us your spec, port of destination and quantity — we’ll send a competitive FOB/CIF price and a real production schedule.