sheet metal / baking tray
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sheet metal
A thinly rolled, flat piece of metal, for example made of steel, aluminum, or copper.
Für die Autoreparatur musste ein neues Stück Blech eingeschweißt werden.
For the car repair, a new piece of sheet metal had to be welded in.
The meaning of 'Blech' depends heavily on the context. In a workshop it means metal, in the kitchen a baking tray, and in an orchestra the brass instruments.
Der Mechaniker bestellte ein neues Blech für die Autotür.
The mechanic ordered a new piece of sheet metal for the car door.
In a craft or workshop context, 'Blech' (sheet metal) is often used with verbs that describe processing or working the material. Typical combinations are 'Blech schneiden' (to cut sheet metal), 'Blech biegen' (to bend sheet metal), or 'Blech schweißen' (to weld sheet metal).
Der Handwerker muss das Blech genau auf die richtige Größe zuschneiden.
The craftsman has to cut the sheet metal exactly to the right size.
In a kitchen context, prepositions that describe position or movement are important. You put something 'aufs Blech' (onto the baking tray) or take something 'vom Blech' (off the baking tray).
Für die Pizza streiche ich die Tomatensoße direkt aufs Blech.
For the pizza, I spread the tomato sauce directly onto the baking tray.
The expression 'Blech reden' (to talk nonsense) is a fixed colloquial phrase and means 'Unsinn erzählen' (to tell nonsense). The word 'Blech' is used for this meaning only in this combination.
Er hat den ganzen Abend nur Blech geredet.
He talked nothing but nonsense all evening.
wood
'Holz' and 'Blech' can both refer to materials, but they are very different: 'Holz' comes from trees; 'Blech' is a thin sheet of metal. The words can also be confused in music, because 'das Holz' can stand for the woodwinds and 'das Blech' can colloquially stand for the brass section. In addition, 'Blech' often means a baking tray in everyday language. So pay attention to the context: in building or heating, 'Holz' is a natural material; in baking or with metal sheets, 'Blech' is correct.
Lisa legt die Brötchen auf das Blech und schiebt es in den Ofen.
Lisa puts the rolls on the baking tray and slides it into the oven.
Für das Regal kauft Max im Baumarkt neues Holz.
Max is buying new wood for the shelf at the hardware store.