Austenite heat-resistance stainless steel resisting high temperature oxidation

Abstract

The invention discloses an austenite heat-resistance stainless steel resisting high temperature oxidation. The austenite heat-resistance stainless steel comprises the chemical components in percentage by weight: below 0.02 percent of C, 2.0-2.5 percent of Si, 1-2 percent of Mn, 20-22 percent of Cr, 12-14 percent of Ni, 0.11-0.15 percent of N, less than 0.035 percent of P, less than 0.005 percent of S, 0.06-0.11 percent of Ce+La+Y, 0.05-0.15 percent of V, 0.1-0.3 percent of Nb and the balance of Fe and inevitable impurities, wherein (Cr+1.5Si+0.5Nb) / (Ni+0.5Mn+20N) is not less than 1.4 and not more than 1.6, and (Nb+V) is not less than 1.5(C+N) and is not more than 0.35 percent. The austenite heat-resistance stainless steel disclosed by the invention has good high temperature strength, oxidation resistance and formation property, and meets the requirements of continuous rise of use temperature of an automobile exhaust system and environment protection; the use temperature of the austenite heat-resistance stainless steel can reach 1050 DEG C; the requirements on the continuously raised use temperature of an automobile exhaust air system is continuously raised and environment protection are met.

Description

technical field [0001] The invention relates to an austenitic stainless steel, in particular to an austenitic heat-resistant stainless steel resistant to high-temperature oxidation, which is suitable for making high-temperature end parts of an automobile exhaust system. Background technique [0002] Heat-resistant stainless steel is closely related to the progress of energy and power machinery, and can be used in thermal power generation, atomic energy, aerospace, aviation, petroleum and chemical industries and other fields. Recently, heat-resistant stainless steel has been gradually applied to automobile emission system engineering. Reducing automobile exhaust emissions is a huge challenge faced by all mankind. With the adjustment of automobile exhaust emission regulations, the performance of automobile engines has improved, and the exhaust gas temperature has become higher and higher. The exhaust temperature has increased from the current 900-950°C to 1000 ~ 1050 ℃, which...

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Problems solved by technology

1. 4828 and 309S are relatively weak in high temperature oxidation resistance, and have not achieved satisfactory results when used. 310S is expensive, which greatly increases production costs

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