SA612M适用范围：
本技术协议适用于最大厚度25mm的中低温焊接压力容器用镇静C-Mn-Si钢板的生产及检验。

SA612M的化学成分%
C            熔炼分析                       ≤0.25
              成品分析                       ≤0.25
Mn          熔炼分析                      1.00~1.50
             成品分析                        0.92~1.62 
                                                 P ≤0.03 (注1)
                                                 S ≤0.02 (注1)
Si           熔炼分析                       0.15~0.50
              成品分析                       0.13~0.55
Cu          熔炼分析                      ≤0.35
              成品分析                      ≤0.38
Ni           熔炼分析                      ≤0.25
              成品分析                      ≤0.28
Cr          熔炼分析                      ≤0.25
              成品分析                      ≤0.29
Mo          熔炼分析                      ≤0.08
              成品分析                      ≤0.09
元素                                          成分 %
V            熔炼分析                      ≤0.08
             成品分析                       ≤0.09
Nb           熔炼分析                     ≤0.02 (注2)
             成品分析                       ≤0.03
Ti           熔炼分析                      ≤0.03
             成品分析                       ≤0.04
Al           熔炼分析                      ≥0.020
             成品分析                       ≥0.020

SA612M的力学性能：
项目                                      性能 (12.5mm以下)                       性能(12.5mm至25mm)
抗拉强度 （MPa）                  570~725                                    560~695
屈服强度 （MPa）                  ≥345                                           ≥345
伸长率（标距200mm），%      ≥16                                            ≥16
伸长率（标距50mm），%        ≥22                                             ≥22
-40℃V型横向冲击功，J            平均值≥27
                                            单个值≥20

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