The Scientific Research Institute of Steel (), also known as NII Stali (), is a Russian research institute (NII) located in the capital city of Moscow.
The institute occupies an area of 64,000 m2, including production areas of 40,000 m2. It is organized as a joint-stock company and was founded in 1942.
The company is known for its military products, including tank armor and military helmets. Since 2023, it also produces anti-fragmentation blankets.
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«Калашников» начал серийное производство титановых бронешлемов «Эльбрус-Т» (in Russian) «Калашников»: «Эгида-У» от НИИ Стали защищает от осколков на 100% (in Russian)