Stainless Steel Seamless Pipe: Schedules, Wall Thickness & Price Guide

Stainless steel seamless pipe: A Practical Buying Guide

Looking for a reliable stainless steel seamless pipe supplier? Huaxiao Stainless keeps 100,000 tons of inventory, ships in 15 days, and is certified to ISO/TS16949. Before you request a quote, here is what actually matters when specifying and sourcing stainless steel seamless pipe.

Why Choose Stainless Steel Seamless Pipe

Stainless steel seamless pipe is extruded or cold-drawn from a solid billet, so it has no weld seam and no heat-affected zone. That single fact is why specifiers reach for it in high-pressure and high-temperature service: there is no longitudinal weakness to fail under cyclic loading, and corrosion has no seam to attack. For steam lines, hydraulic circuits and chemical process piping, seamless remains the default.

Compared with welded tube, seamless pipe carries a higher price per kg but a higher allowable stress, which often lets engineers specify a thinner wall for the same pressure rating.

Specifications, Schedules & Sizes

We supply seamless pipe in 304, 304L, 316, 316L, 321 and 310S to ASTM A312 / A213 / A269. Nominal bore runs from 1/8″ to 24″ (6 mm to 610 mm OD), in schedules SCH 5S, 10S, 40S, 80S, 160 and XXS. Wall thickness spans 1.0 mm to 30 mm.

• Finish: pickled, annealed, mirror polished or sand-blasted
• Length: 6 m standard, up to 12 m or cut to order
• Ends: plain, bevelled or threaded
• Testing: hydrostatic, eddy current, ultrasonic and PMI on request

Every shipment ships with an EN 10204 3.1 mill test certificate covering chemistry and mechanical properties.

Stainless Steel Seamless Pipe Price Factors

The stainless steel seamless pipe price per kg is driven by five variables:

1. Grade – 316/316L costs 15-30% more than 304 because of the 2-3% molybdenum addition.
2. Diameter and schedule – heavy walls (SCH 160, XXS) and very small bores both carry a premium.
3. Nickel surcharge – LME nickel movement passes straight through to the base price.
4. Order quantity – full-bundle orders unlock mill-direct pricing.
5. Testing and finish – polished or ultrasonically tested pipe adds processing cost.

Send us your bore, schedule, grade and tonnage and we will return a landed price, not just an ex-works number.

Common Applications

Seamless pipe is specified for boiler and superheater tubes, refinery and petrochemical process lines, hydraulic and instrumentation tubing, heat exchangers, condensers, food and pharmaceutical piping, and offshore risers. Anywhere pressure, temperature or purity is critical, seamless is the safer engineering choice.

How to Choose a Reliable Supplier

Ask three questions before you place an order. First, can the supplier produce a traceable mill certificate that matches the heat number stamped on the pipe? Second, is PMI (positive material identification) available on arrival so you can prove the grade? Third, what is the real lead time on your exact schedule, not on generic stock?

A dependable stainless steel seamless pipe supplier answers all three without hesitation. Huaxiao Stainless holds 100,000 tons of stainless inventory, dispatches within 15 days, and operates under ISO/TS16949 quality control with full traceability on every heat.

Frequently Asked Questions About Stainless steel seamless pipe

Get a Quote for Stainless steel seamless pipe

Stainless steel seamless pipe in stock: 100,000 tons available, 15-day delivery, certified to ISO/TS16949. Browse our stainless steel seamless pipe product page or contact us for a quote to get a competitive price today.