1，516的四个级别，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，化学成分不同，而力学则一致；345R，各个厚度的化学成分一致，而力学则不同，随着厚度的提高，强度则下降。

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更为苛刻，345R的有害元素符合我国《压力容器安全技术监察规程》，而516则不符合，因此，在国内，516在订货的时候，往往对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的四个级别，最低使用温度可以达到-51摄氏度，其中，516-70在25mm以下，最低使用温度是-46度，75mm以下是-40度，见ASME A20；而Q345R，最低使用温度是-20摄氏度，见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.

5，516四个级别，40mm以上规格，必须正火交货，要求低温冲击的，所有规格（包括40mm以下）必须正火交货；而Q345R，则没有这方面的要求，虽然GB150要求大于等于30mm以上的要求正火交货，但实际上，取决于合同约定和钢厂内部的工艺规定。

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.

济南永亚钢铁贸易有限公司的济钢代理商的提供技术支持，更多精彩内容请进入：http://www.jnyygt.com，我们会倾情为您解答。

Ji'nan YONGYA steel trade Co. Ltd. Jinan agents to provide technical support, more exciting content, please enter: http://www.jnyygt.com, we will love to answer your questions.