Black Carbon Steel ERW Square Tube for Structural Engineering Pipe

We provide flexible and diversified cooperation modes to meet diverse customer demands, mainly including long-term strategic procurement, customized OEM production, sample trial orders, and regional agency distribution. For large-volume buyers and long-term partners, we will design exclusive cooperation plans, and offer supporting benefits like priority production, fixed price protection and bulk order discounts.

For conventional standard seamless steel pipes, the MOQ is 1 ton for trial orders, and 5 tons for formal bulk orders. For customized products with special materials, non-standard sizes or special processing requirements, the MOQ can be adjusted flexibly based on specific production conditions, and we support small-batch trial orders for new cooperative customers.

After receiving the advance payment and confirming all order details, the production cycle for conventional standard seamless steel pipes is 7-12 working days. For customized orders with special heat treatment, surface treatment or complex processing, the lead time will be 15-25 working days. We will send regular production progress updates to ensure on-time delivery as scheduled.

We manufacture seamless steel pipes with premium materials including 10# steel, 20# steel, 45# carbon steel, Q355B low-alloy steel, 304/316 stainless steel. The conventional specifications cover outer diameter from 4mm to 620mm, wall thickness from 0.5mm to 100mm, and we can customize full range of non-standard sizes per customer drawings. Our products feature high dimensional accuracy, smooth inner and outer surfaces, no welding seams, excellent pressure resistance and stable mechanical propert

Yes, we offer a complete set of customized processing services, such as fixed-length cutting, double-end chamfering, bending, drilling, tapping, surface galvanizing, phosphating, bright annealing, sandblasting and heat treatment. Customers only need to provide detailed product drawings, technical parameters or application scenarios, and our professional technical team will develop targeted production and processing solutions to meet your personalized needs.