Black carbon steel square tubes are manufactured from steel ingots or solid tube billets through perforation to create capillary tubes, followed by hot-rolled, cold-rolled, or cold-drawn processes. These ERW (Electric Resistance Welded) steel pipes are available in both round and square configurations, serving as essential construction materials.

• Excellent perpendicularity and dimensional accuracy
• Clean cuts with no bevel requirements
• Superior ovality control with out-of-roundness rate ≤ 3%
• Advanced bending technology with thinning rate ≤ 15%

We select appropriate packaging methods based on product types to minimize transportation losses and ensure product integrity.

Professional quality inspectors conduct on-site testing of materials and specifications before shipment, with photographic documentation. Customers can track and monitor logistics progress throughout transportation.

Our products undergo at least 16 quality control processes and include third-party authoritative inspection reports. Professional inspection ensures accurate weight measurement and product compliance.

Weifang Wilda Machinery Co., Ltd., established in 2003, specializes in manufacturing high-precision galvanized welded steel pipes. We produce round, square, and special-shaped steel pipes according to customer specifications.

Our comprehensive facilities include sheet metal processing, welding, and metal surface treatment workshops, enabling us to meet diverse customer requirements.