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Anonymous users2024-01-24Enamel basins have no specific requirements for steel, the most common steel is fine.
The drill bit is generally made of high-speed steel. High speed steel has high hardness, high wear resistance, high heat resistance, and appropriate toughness. It is very suitable for making drill bits.
The springs are made of spring steel. This steel is fatigue-resistant and has slow elastic decay.
This must be bad, originally the sofa is made of sponge, because the spring is the inner spring skin wrapped with sponge, with about 2 years can basically determine that you should change the cushion, because with 2 years of time spring can be the surface of the sponge broken, and then the spring will fully bounce up, resulting in uneven cushions, buttocks, serious will expose the spring wire.
It should be fine, you open it and use it, once I threw the Apple 4 to the bottom of the couch and it was fine.
Yes, but I don't know what kind of spring pad you have, usually the springs sandwiched in the sponge are wrapped in non-woven fabric. And in winter, the weather is dry, and there is a danger of burning. Most of the spring mats are on a wooden board in the center of the seat, and the posts are fixed with gun nails, with a centimeter of sponge underneath and some sponge blocks around it.
It will not fall too deep and damage the lumbar spine.
The springs are good. The best structure of the sofa, the front and back direction under the seat cushion should be a serpentine spring, and the left and right direction is an elastic band. Nowadays, the vast majority of sofas are also of this structure. >>>More