Have a look at a set for Unreal that features grenade effects for multiple surfaces. Free of charge in September!

The pack includes a collection of grenade explosion effects for a variety of surface types, including concrete, dirt, grass, ice, and more.

Surfaces:

• Default
• Air
• Concrete
• Dirt
• Grass
• Ice
• Metal
• Snow
• Wood
• Water

It also features a scorch decal, materials textures, and geo camera shake Blueprint, plus a grenade Blueprint that uses the effects. The author noted that all effects are a mixture of CPU, GPU and mesh emitters.

You can learn more and get it here.