How are the spring steel bars in your sleeping mattress made?
It is said that British people spend nearly 2 billion pounds on mattresses every year, and everyone will spend about 26 years in bed in their lives.
The mattress factory needs a lot of steel every year. Let's go to the steel bar manufacturer to see what kind of process is this mattress steel bar from liquid to solid to flexible and strong.
As you can see, these steels have good strength and toughness. They are resistant to tension and bending, and they cannot be destroyed by normal movements.

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