Haihao Group Ships ASME B16.9 316/316L Seamless Elbows to Russian Client

For Russian process piping projects that combine standard ASME specifications and strict dimensional controls, consistent wall thickness on formed elbows is a frequent pain point. Haihao Group recently finished inspection and shipment of a batch of seamless stainless steel elbows built to ASME B16.9, destined for our Russian partner.

This batch includes 45°, 60° and 90° long radius elbows, covering two main sizes: DN350 (355.6×8 mm) and DN250 (273×7 mm). All are seamless, manufactured from dual-grade 316/316L stainless steel. The 316/316L seamless elbow is preferred here because it balances corrosion resistance and welding flexibility, matching the material requirements of many industrial lines in Russia.

ASME B16.9 seamless 316316L long radius elbows DN250 DN350 for Russian pipeline project

Every 316/316L seamless elbow in this order goes through dedicated heat treatment to stabilise mechanical properties after hot forming. Our QC team strictly enforces the agreed thickness limits: extrados wall thickness minimum 87.5% of nominal, and end wall thickness tolerance no more than +12.5%. This tight control avoids uneven thinning that often causes rework during site hydrotesting.

Unlike standard stock elbows with looser tolerance bands, this 316/316L seamless elbow order was produced with the project’s acceptance criteria clearly locked in before production. Each unit carries full marking, and material test records are supplied alongside the shipment for the client’s internal review and third-party verification.

We regularly support Russian piping contractors with ASME B16.9 stainless fittings, including custom bend angles, controlled wall thinning and full heat treatment packages. If you are sourcing 316/316L seamless elbow or other formed pipe bends with non-standard tolerance requirements, share your specification with our engineering team. We can review your technical constraints and provide a reliable lead time and quotation.