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Q345 是一種鋼材的材質。它是低合金鋼，廣泛應用于橋梁、車輛、船舶、建筑、壓力容器等。Q代表的是這種材質的屈服，后面的345，就是指這種材質的屈服值，在345左右。并會隨著材質的厚度的增加而使其屈服值減小。
Q345 is a kind of steel material. It is a low alloy steel, widely used in bridges, vehicles, ships, buildings, pressure vessels, etc.. Q represents the yield of this material, followed by 345, refers to the yield value of this material, in the 345 or so. And the yield value decreases with the increase of the thickness of the material.
40Cr鋼板是機械制造業使用最廣泛的鋼之一。調質處理后具有良好的綜合力學性能，良好的低溫沖擊韌性和低的缺口敏感性。鋼的淬透性良好，水淬時可淬透到Ф28～60mm,油淬時可淬透到Ф15～40mm。
40Cr steel plate is one of the most widely used steel in mechanical manufacturing industry. After the quenching and tempering treatment, it has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity. The hardenability of the steel is good, water quenching can be quenched to 28 ~ 60mm, when quenching oil quenching to 15 ~ 40mm.
這種鋼除調質處理外還適于氰化和高頻淬火處理。切削性能較好，當硬度為HB174～229時，相對切削加工性為60%。該鋼適于制作中型塑料模具。
This kind of steel is suitable for the treatment of cyanide and high frequency quenching, besides the quenching and tempering treatment. The cutting performance is good, when the hardness is HB174 ~ 229, the relative machinability is 60%. The steel is suitable for making medium plastic mould.
低合金板經過前一段時間的快速反彈，上周國內鋼材市場價格漲幅明顯放緩，繼續上漲動力減弱;在成交不暢的情況下，市場疲態漸現，加上期鋼市場的持弱偏弱震蕩，進一步加重商家觀望心態，因此上周鋼價窄幅震蕩回落，供需雙方均有一定的觀望心態，因需求基本面受到南方雨水影響及商家在月底資金壓力再現影響，預計短期內國內鋼價還將繼續震蕩偏弱運行為主。
Low alloy plate after the rapid rebound in a period of time before the last week, the domestic steel market price increase is slowing down, continue to rise in power weakened; poor turnover situation, the market weakness gradually, plus the steel market to weak weak shocks, further aggravating the business mentality, so last week, steel price shocks narrow down, supply and demand the two sides have a wait-and-see attitude, and influence by rain in the south of businesses in the end of the month due to financial pressure reproduction demand fundamentals, expected short-term domestic steel prices will continue to run the main weak shock.