Q345鋼板指這種材質(zhì)的屈服強(qiáng)度下限為345MPa，是一種低合金鋼，綜合力學(xué)性能良好，低溫性能，易可塑性和焊接性良好，用做中低壓容器、油罐、車輛、起重機(jī)、礦山機(jī)械、電站、橋梁等承受動荷的結(jié)構(gòu)、機(jī)械零件、建筑結(jié)構(gòu)、一般金屬結(jié)構(gòu)件，熱軋或正火狀態(tài)使用，可用于-40℃以上寒冷地區(qū)的各種結(jié)構(gòu)。Q345鋼的可塑性（即塑性）和焊接性能良好。如果塑性好，可以加工成各種形狀。良好的焊接性能也使其更易于加工，從而節(jié)省了加工成本。

Q345 steel plate refers to the yield strength of this material of 345MPa, is a low alloy steel, good comprehensive mechanical properties, low temperature performance, easy plasticity and weldability, used as low pressure containers, oil tanks, vehicles, cranes, mining machinery, power station, bridge structure, mechanical parts, building structure, general metal structure, hot rolled or hot state, can be used in the cold area above-40℃.Q345 steel plasticity (i. e. plasticity) and welding performance.If the plastic is good, it can be processed into various shapes.Good welding performance also make it easier to process, thus saving processing costs.

用于建筑橋梁鋼板要求有較高的強(qiáng)度、耐性以及承受機(jī)車車輛的載荷和沖擊，且要有杰出的抗疲勞性、一定的低溫耐性和耐大氣腐蝕性。拴焊橋梁用鋼還應(yīng)具有杰出的焊接功用和低的缺口敏感性。

Steel plate for building bridge requires high strength, resistance and load and impact of locomotive and vehicles, and outstanding fatigue resistance, certain low temperature resistance and atmospheric corrosion resistance.Steel for tie-welding bridges shall also have outstanding welding function and low gap sensitivity.

除了主要應(yīng)用于橋梁，我國很多地標(biāo)性建筑比如上海環(huán)球金融中心、中央電視臺新臺址建設(shè)工程、國家體育場、國家大劇院、上海世博館、上海世博主題館、上海世博文化中心、首都國家機(jī)場、上海浦東國際機(jī)場、上海國際賽車場等都大量使用Q345，作為目前成熟的、綜合性能強(qiáng)的鋼材，其使用占比非常高，且多以鋼板的形式使用。

In addition to mainly used in Bridges, many landmark buildings such as Shanghai global financial center, CCTV new site construction project, national stadium, national grand theatre, Shanghai expo pavilion, Shanghai expo pavilion, Shanghai expo, Shanghai expo culture center, the capital national airport, Shanghai pudong international airport, Shanghai international circuit are used Q345, as the mature, comprehensive performance of steel, its use proportion is very high, and more in the form of steel plate.