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Semimetals and metallic elements in steel

2019-12-27 09:53:46   COMMENT:0 HITS:
  Effect of silicon on API 5L Gr. B Seamless Steel Line PipeThe role of silicon (SI) in API 5L Gr. B Seamless Steel Line Pipe.

  Si is used as a reductant and deoxidizer in the process of steelmaking, and usually contains 0.15-0.30% silicon in the steel of depressant.

  Silicon can improve the elastic limit, yield point and tensile strength of steel. Therefore, it has been widely used in spring steel.

  Adding 1.0-1.2% silicon to the quenched and tempered structural steel will increase the strength by 15-20%.

  Silicon combines molybdenum, tungsten, chromium and other components to improve corrosion resistance and oxidation resistance. Therefore, this steel combination is suitable for the production of electrical heat-resistant steel.

  However, if the silicon content is increased, the welding performance will be reduced.

  Effect of manganese on API 5L Gr. B Seamless Steel Line Pipe

  The effect of manganese on steel. In the process of steelmaking, manganese is a good deoxidizer and desulfurizer. Generally, the content of manganese in steel is 0.3-0.35%. When more than 0.7% manganese is added to carbon steel, it is called manganese steel. It has not only enough toughness, but also higher strength and hardness.

  For example, the yield point of 16Mn alloy steel is 40% higher than that of A3 steel.

  In addition, the steel with 11-14% manganese content has high wear resistance, which is used for excavator bucket and ball mill bushing. With the increase of manganese content, the corrosion resistance and weldability decrease.

  For example, for API standard 650, it is required to determine by thermal analysis that the manganese content of all thickness ASTM A36 carbon (semi killed or fully killed rolled) steel plates should be 0.80% - 1.20%.

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