我公司大型煤炭装卸机械均为引进设备，常年在紧靠海岸的堆场及深入海中的码头作业。这些设备上所有管接头均为进口件，设备安装半年后锁紧态黄铜螺母全部自然开裂。由于设备尚未运转，在未受外力作用下，黄铜螺母自然开裂，我们初步推断这可能是由码头潮湿的大气环境，及螺母 Our company’s large-scale coal loading and unloading machinery are all imported equipment, all the year round and close to the coast of the yard and in-depth sea quay operations. All pipe fittings on these devices are imported parts, all six months after the installation of the lock nut brass nuts naturally cracked. Since the equipment is not yet running, the brass nut is naturally cracked without external forces. We initially conclude that this may be caused by the damp atmospheric environment of the wharf and the nut