镇静钢板是由普通碳素结构钢镇静钢热轧制成的钢板。镇静钢是脱氧完全的钢，钢液在浇注前用锰铁、硅铁和铝等进行充分脱氧，钢液含氧量低（一般为0.002-0.003%），钢液在钢锭模中较平静，不产生沸腾现象，镇静钢由此得名。

The steel plate is made of ordinary carbon structural steel. Deoxidation fully killed steel is steel, fully molten steel deoxidation ferromanganese, ferrosilicon and aluminium before casting, molten steel with low oxygen content (0.002-0.003%), liquid steel in the mould is calm, do not produce boiling phenomenon, which is named after the calm steel.

在正常操作条件下，镇静钢中没有气泡，组织均匀致密；由于含氧量低，钢中氧化物夹杂较少，纯净度较高，冷脆和时效倾向小；同时，镇静钢偏析较小，性能比较均匀，质量较高。镇静钢的缺点是有集中缩孔，成材率低，价格较高。因此，镇静钢材主要用于低温下承受冲击的构件、焊接结构及其他要求强度较高的构件。

Under normal operating conditions, no bubble calm steel, microstructure; due to low oxygen, oxide inclusion in steel less, high purity, cold brittleness and aging tendency; at the same time, steel segregation is small, performance is relatively uniform, high quality. Calm steel disadvantage is concentrated shrinkage, low yield, high price. Therefore, the steel is mainly used for low temperature impact of the impact of the components, welding structure and other requirements of higher strength components.

低合金钢板都是镇静钢和半镇静钢钢板。由于强度较高，性能优越，能节约大量钢材，减轻结构重量，其应用已越来越广泛。

Low alloy steel plates are both dead and semi killed steel plates. Because of the high strength, superior performance, can save a lot of steel, reduce the weight of the structure, its application has been more and more widely.

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