稳定的产品质量中的“稳定”用哪个英语单词翻译比较好

steady就可以了

我建议你用durable

下面是webster词典的权威解释，希望可以帮到你。
able to exist for a long time without significant deterioration; also : designed to be durable <durable goods>

Solid

Solid = firmly united or consolidated. Example: a solid combination.

Durable 可当耐用，不能作为稳定。