Steel Hatch
Can be placed or used to upgrade an Iron Hatch.
Press & hold Activate to lock or set a combination. Repair with Forged Steel and a construction tool.
Upgrade path
Hit a placed block with a stone axe, claw hammer or nail gun while carrying the material of the next step.
Also upgraded from 
Blue Iron Hatch (1× Steel Hatch), Brown Iron Hatch (1× Steel Hatch), Green Iron Hatch (1× Steel Hatch), Grey Iron Hatch (1× Steel Hatch), Iron Hatch (1× Steel Hatch), Orange Iron Hatch (1× Steel Hatch), Pink Iron Hatch (1× Steel Hatch), Purple Iron Hatch (1× Steel Hatch), Red Iron Hatch (1× Steel Hatch), White Iron Hatch (1× Steel Hatch), Yellow Iron Hatch (1× Steel Hatch).
Crafting
Craft at Workbench · makes 1
Forged Steel× 10
Spring× 10
Mechanical Parts× 10
Harvest drops
Iron× 96
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
When it collapses
Falling, it leaves 
Scrap Metal Pile (75% of the time) where it lands.
Where to find (44 POIs)
Pop-N-Pills Factory (tier 5), Red Mesa Compound (tier 5), Shamway Factory (tier 5), Shotgun Messiah Factory (tier 5), ChemTech Distribution Center (tier 4), Fort Camo (tier 4), Goldrush Station (tier 4), Hybrid Energy (tier 4), Installation Blue Ridge (tier 4), Ironwood Paper Mill (tier 4), Jeffelon Zuckergates Estate (tier 4), Pergola Apartments (tier 4), The Mortician's house (tier 4), The Wright Residence (tier 4), Water Treatment Plant (tier 4), Water Works (tier 4), Bob's Boars & Carl's Corn (tier 3), Fit Box (tier 3), HNN Bank (tier 3), Navezgane Fire District #3 (tier 3), Pass-N-Gas Refinery (tier 3), Pawsnout Factory (tier 3), Pop's Pawn & Bel's Bakery (tier 3), Seemore Bank (tier 3), Taylor Manor (tier 3), The Neckarski Residence (tier 3), The Serrano Residence (tier 3), Ma Baker & Sons Bakery (tier 2), Navezgane Creamery (tier 2), The Asgård Residence (tier 2), Bomb Shelter 41 (tier 1), Duck Station (tier 1), The Cylinder (tier 1), Busted Industrial Tank, Clunky Oil, Hidden Hollow, Industrial Service Systems, Industrial Tank #1, Industrial Tank #2, Leaking Industrial Tank and 4 more.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.