The effect of nitrogen (N) on the properties of A573 grade 70 structural steel plate and so on steel is similar to that of carbon and phosphorus. With the increase of nitrogen content, the strength of steel can be significantly improved, especially the plasticity, especially toughness, and the weldability will be decreased, and the cold brittleness will be intensified. At the same time, aging tendency, cold brittleness and hot brittleness will be increased, which will damage the weldability and cold bending property of steel. Therefore, the nitrogen content in A573 grade 70 structural steel plate and so on steel should be reduced and limited as much as possible. Generally, nitrogen content should not be higher than 0.018%.
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A plasma cutter uses a stream of compressed gas (air, nitrogen, argon, etc.) and a consumable wire electrode as the two primary feedstocks of the steel cutting process. The electrode sends a high electrical charge through the gas, raising its temperature to the point of ionization to generate extremely hot plasma (~20,000°C). This plasma is directed through the cutting tip to create a highly focussed beam, with velocities approaching the speed of sound.
The weight of seamless steel pipe is only 1 / 5 of that of square steel. Seamless steel pipe corrosion resistance acid, alkali, salt and atmospheric environment corrosion, high temperature resistance, good impact and fatigue resistance, do not need regular maintenance. The effective service life of product A573 grade 70 structural steel plate more than 15 years.
