They probably used older methods (friction, pyrite and flint).
In roman times (Norway) steel was expensive and rare. A "ildtein" (fire awl) and a belt stone (quartzite) was used to produce fire. An awl need little steel and is easy to produce.
As mentioned by others the steel as we know it came into use a little before the viking age. This coresponds with increased production of iron and steel in the period.
Just because you have a tecnology or access to materials doesn`t neccesary mean that they are commonly used. Several factors are at play.
150 years ago it was quite common for children in Norway to go to neighbouring farms to borrow fire although matches and flint and steel was both known.
In roman times (Norway) steel was expensive and rare. A "ildtein" (fire awl) and a belt stone (quartzite) was used to produce fire. An awl need little steel and is easy to produce.
As mentioned by others the steel as we know it came into use a little before the viking age. This coresponds with increased production of iron and steel in the period.
Just because you have a tecnology or access to materials doesn`t neccesary mean that they are commonly used. Several factors are at play.
150 years ago it was quite common for children in Norway to go to neighbouring farms to borrow fire although matches and flint and steel was both known.