本发明提供一种用于超低温的高强韧高锰钢，由以下质量百分比的元素组成：C：0.3‑0.6%；Si：0.02‑0.1%；Mn：20.0‑26.0%；Al：0.5‑2.5%；Nb：0.05‑0.3%；P：≤0.010%；S：≤0.002%；N：0.004‑0.010%；O：0.0005‑0.002%；余量为Fe。本发明还进一步提供一种用于超低温的高强韧高锰钢的热处理工艺。本发明提供的一种用于超低温的高强韧高锰钢及其热处理工艺，通过冷轧+低温时效+高温再结晶的热处理工艺，制备获得用于超低温的高强韧高锰钢，具有良好的强度和优异的塑性，并且其具有良好的焊接性，成本较低，热处理工艺较为简易。

The present invention provides a high-strength, high-manganese steel for ultra-low temperature, which is composed of the following elements by mass percentage: C: 0.3-0.6%; Si: 0.02-0.1%; Mn: 20.0-26.0%; Al: 0.5-2.5% ; Nb: 0.05‑0.3%; P: ≤0.010%; S: ≤0.002%; N: 0.004‑0.010%; O: 0.0005‑0.002%; the balance is Fe. The present invention further provides a heat treatment process for ultra-low temperature high strength and toughness high manganese steel. The present invention provides a high-strength and toughness high-manganese steel for ultra-low temperature and its heat treatment process. Through the heat treatment process of cold rolling + low-temperature aging + high-temperature recrystallization, the high-strength and toughness high-manganese steel for ultra-low temperature is prepared and has good strength. And excellent plasticity, and it has good weldability, low cost, and the heat treatment process is relatively simple.