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1，516的四個級別，包括55、60、65、70，Mn含量上限是1.2%，而345R Mn含量下限是1.2%，
Four of the 1516 levels, including 55, 60, 65, 70, the upper limit of the Mn content is 1.2%, while the lower limit of the Mn 345R content is 1.2%,
2，516因厚度不同，化學成分不同，而力學則一致；345R，各個厚度的化學成分一致，而力學則不同，隨著厚度的提高，強度則下降。
2516 because of the different thickness, the chemical composition is different, but the mechanics is consistent; 345R, the chemical composition of each thickness is consistent, but the mechanics is different, with the increase of thickness, strength is decreased.
3，345R的P、S含量比516更為苛刻，345R的有害元素符合我國《壓力容器安全技術監察規程》，而516則不符合，因此，在國內，516在訂貨的時候，往往對p、s含量作出附加的要求。
3345R P, the S content is more than 516 for the harsh, harmful elements 345R in line with China's "pressure vessel safety technology", and the 516 does not meet, therefore, in China, 516 in the order of time, often make additional requirements for P and s content.
4，516的四個級別，最低使用溫度可以達到-51攝氏度，其中，516-70在25mm以下，最低使用溫度是-46度，75mm以下是-40度，見ASME A20；而Q345R，最低使用溫度是-20攝氏度，見GB150.
Four level 4516, the minimum temperature can reach -51 degrees Celsius, the 516-70 below 25mm, the minimum temperature is -46 degrees, -40 degrees below 75mm, see ASME A20; and Q345R, the minimum temperature is -20 degrees Celsius, see GB150.
5，516四個級別，40mm以上規格，必須正火交貨，要求低溫沖擊的，所有規格（包括40mm以下）必須正火交貨；而Q345R，則沒有這方面的要求，雖然GB150要求大于等于30mm以上的要求正火交貨，但實際上，取決于合同約定和鋼廠內部的工藝規定。
The 5516 and four levels above the 40mm specifications, delivery requirements must be normalized, low temperature impact, all specifications (including 40mm) and Q345R, the delivery must be normalized; without this requirement, although GB150 is greater than or equal to 30mm above the requirements of normalizing delivery, but in fact, the process depends on the provisions of the contract and the internal steel.
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Ji'nan YONGYA steel trade Co. Ltd. Jinan agents to provide technical support, more exciting content, please enter: http://www.ctmpfsc.com, we will love to answer your questions.