... from the stiffening effect of molybdenum and niobium on its nickel-chromium matrix, thus precipitation-hardening treatments are not required. ... Welded Pipe), ISO 6207 (Tube), SAE/AMS 5581 (Seamless & Welded Tube), VdTÜV 499 (Tube), BS 3074NA21 (Seamless Pipe & Tube), DIN 17751 (Tube), ASME Code Case 1935 ... contact us,Zhejiang Chaowei New Material Co., Ltd.(High Nickel Alloy and Super Alloy Materials)