Although it's more cost-effective to work with iron from hgdgsvhgvuj's blog

The player will need to travel to The Artisans Workshop to make the burial armor. To find the Artisans workshop, search for its southeast side of Falador RuneScape Gold. On the workshop's eastern side there's a dwarf Suak will be on a stage near the anvils. Inquire him to show you how to do it. He'll invite another dwarf Sten to show you how to make it in the form of a cut-scene. If you were not paying attention, then you can ask for him to repeat the question.

Once Sten will demonstrate to you, Suak will tell you which piece of armor to create. If you make the piece he asks, you'll get a bonus exp reward. When Suak's requested armor changes, in the anvil, choose the armor piece and keep working.

To make Runescape Burial Armor You'll require a hammer steel, mithril an adamant or rune ingot. You'll require smithing level 30 as this is the minimum requirement needed to work with iron ingots. To work with steel, you'll need level 45 Smithing. Level 60 for mithril, Level 70 for Adamant, and level 90 for Runite.

Although it's more cost-effective to work with iron but the process is slow. When you work with Iron Grade I, you'll receive 40,000 experiences every hour. However, if you select Steel Grade I, you'll have 50,000 hours per hour. The more valuable the metal  Cheap RuneScape Gold, with a greater grade you choose and the greater smithing experience that you'll accrue.