1. Large diameter: It is generally believed that seamless steel pipes with diameters above 219 are large-diameter seamless pipes, those with diameters less than 76 are small-diameter seamless pipes, and those in the middle are considered conventional seamless pipes.

Adding 1.0-1.2% silicon to quenched and tempered structural steel can increase the strength by 15-20%. Silicon is combined with molybdenum, tungsten, chromium, etc. to improve corrosion resistance and oxidation resistance, and can be used to make heat-resistant steel. Low-carbon steel containing 1-4% silicon has extremely high magnetic permeability and is used in the electrical industry to make silicon steel sheets. When the silicon content is too high, the plasticity, toughness, corrosion resistance, and weldability of the steel will be reduced.

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