验证了钢材的强度级别越高，对应力腐蚀越敏感规律。
The higher the strength of a steel is, the more susceptible to stress corrosion the steel is.
在清单4中使用强度级别2，所以“paris”和“paris”是相等的。
In Listing 4 strength level 2 is used so that "Paris" and "Paris" are equal. Following are examples of other possible values.
随着管材强度级别的提高，对管材的韧性、焊接性等性能要求也进一步提高。
As the steel grade improved, the requirements for toughness and weldability are also enhanced.
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