目的 验证复合钢板的极地低温环境适应性。方法 采用爆炸复合的方法制备低温复合钢板。通过全浸腐蚀试验、间浸腐蚀试验、腐蚀磨损试验、系列温度冲击试验、系列温度动态撕裂试验和全厚度止裂试验，分别评价复合钢板的耐蚀性、耐磨性能、低温断裂性能及止裂性能，并对复合钢板的低温断裂性能及极地低温环境适应性进行分析。结果 全浸腐蚀条件下，复合钢板基层材料的腐蚀速率是复层材料的105倍;间浸腐蚀条件下，复合钢板基层材料的腐蚀速率是复层材料的350倍;全浸和间浸状态下，复层钢板的腐蚀速率均远小于基层钢板，复层材料的耐蚀性远远好于基层材料。模拟海水条件下，复合钢板复层317L不锈钢的磨损量为0.003，基层FH40钢的磨损量为0.75，基层材料的磨损量是复层的250倍，复层材料的耐磨性远远好于基层材料。分析了20组大厚度规格低温钢的韧脆转变特征温度与止裂温度的相关性关系，指出了现有规范与标准以冲击功作为低温钢断裂性能技术指标的局限性，建立了止裂温度与动态撕裂韧脆转变特征温度相关性方程，给出了低温钢极地环境低温服役下的韧脆转变特征温度建议值，确定了复合钢板极地低温环境服役的最低温度。结论 模拟海水环境下，复合钢板复层材料的腐蚀速率和磨损量均远低于基层钢板，采用复层材料+基层材料的设计思路能够有效地解决低温钢极地环境下的腐蚀磨损问题。冲击试验测得的性能无法有效表征大厚度低温钢的实际性能，现有标准和规范以冲击性能表征参量作为低温钢断裂的技术指标值将不能保证低温钢极地环境下服役的安全性，心部动态撕裂韧脆转变温度能够较好地表征低温钢的实际服役性能。

This paper aims to improve the polar environment adaptability of low-temperature clad steel plate. In this paper, the low-temperature clad steel plate was prepared by the method of explosion cladding. The full immersion corrosion, interim immersion corrosion, corrosion wear test, series temperature Charpy impact test, series temperature dynamic tear test and full thickness crack arrest test were taken to value corrosion resistance, wear resistance, low- temperature fracture property and crack arresting property of the low-temperature clad steel plate, the low-temperature fracture property and the polar environment adaptability of low-temperature clad steel plate were analyzed. Under full immersion corrosion condition, the corrosion rate of the base material is 105 times that the compound material; Under interim immersion corrosion condition, the corrosion rate of the base material is 350 times that the compound material, and this shows that the compound material has better corrosion resistance than that of the base material in both conditions. Under simulated seawater condition, the wear amount of the compound material 317L stainless steel is 0.003, the base material FH40 steel is 0.75, and the wear amount of the base material is 250 times that of the compound material. This shows that the compound material has better wear resistance than that of the base material. The correlation between ductile-brittle transition characteristic temperature and crack arrest temperature of 20 groups thick low-temperature steels is investigated, and the limitation of taking the impact energy as a technical index of fracture performance of low- temperature steel in existing codes and standards is pointed out. The correlation equation between crack arrest temperature and ductile-brittle transition characteristic temperature of dynamic tear is established, the suggested value of ductile- brittle transition characteristic temperature under low-temperature service is given, and finally the minimum service temperature of clad steel plate in polar low-temperature environment is determined. In a word, under simulated seawater condition, the corrosion rate and wear amount of the compound material of clad steel plate are much lower than that of the base steel plate. The corrosion and wear problems of low-temperature steel in polar environment can be solved by the design idea of compound material + base material. The properties measured by the Charpy impact test can‘t effectively characterize the actual properties of thick steel plates, and taking the impact performance characterization as a technical index value of fracture performance in existing codes and standards will not guarantee the service safety of low- temperature steel in the polar environment. Ductile-brittle transition characteristic temperature of the center dynamic tear test can effectively characterize the actual service performance of low-temperature steel.