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Anonymous users2024-01-24Alloys, of course, at least steel-iron-carbon alloys. In fact, cast iron is also an iron-carbon alloy.
To make security doors, the main basis for selecting raw materials is high hardness, so manganese steel is commonly used. The main components of manganese steel are iron, manganese, carbon, which belong to ferroalloys and are mixtures rather than pure substances.
The anti-theft door belongs to the outer door series, which belongs to the decorative material, and the fire door belongs to the building.
Not part of the top 10 security door rankings:
1. Maxim's wooden door; >>>More
The developer's own door does not require an anti-theft level, requires a fireproof function, the door panel is thin and the lock is poor, and because the internal filling is mostly cement lime and other fireproof functions, the door body is heavy, and the door panel is thin and the folding difference makes its service life short. The self-contained door is an engineering door, which does not meet the D standard, even if the door body is engraved with a word A or other grade steel seal, it may not meet the national standard, because the engineering door only detects fire protection standards.
What part of the security door are you referring to? The door leaf and door frame are made of thin sheets, the inside is generally filled with honeycomb paper, and the paint on the surface is varied!