ASTM A213-T91 Alloy seamless steel tube
High anti –oxidantant and anti high temperature corrosion. Stable Toughness / durable plastic / thermal force; T ∠ 610 ℃ ,its admissable stress is higher than the austenitic steel, T ≥ 550 ℃ Recommended allowable stress of steel is twice as high as that of T9 twice.