论文部分内容阅读
我是《理化检验》杂志的忠实读者.现就我工作中遇到的下列问题向你们请教,请在百忙之中抽空帮助解答.1.硬度的数值应如何表示?是否有标准?2.GB1172—74《黑色金属硬度及强度换算值》中,布氏硬度211～140为什么和洛氏硬度HRB无对应值?我们检查钢的原始状态非常不方便!3.定标距拉伸试样(标距200mm)屈服强度如何测定?屈服强度、抗拉强度又如何修约?4.我们单位生产一种直径44～93mm油管,内壁激光处理,我们想在工序后无损检测其内壁硬度,采用什么方法和什么仪器比较合理?
I am a faithful reader of the magazine “Physical and Chemical Testing.” I will now advise you on the following problems that I encountered in my work, and I will give my time to help answer the questions. GB1172-74 “Black metal hardness and strength of the conversion value,” Brinell hardness of 211 to 140 and Rockwell hardness HRB no corresponding value? We check the original state of the steel is very inconvenient! 3. Calibration from the tensile specimen ( The standard distance of 200mm) how to determine the yield strength? Yield strength, tensile strength and how to repair? 4. Our unit produces a diameter of 44 ~ 93mm tubing, laser treatment of the wall, we want to nondestructive testing after the process of its inner wall hardness, what Method and what instrument is more reasonable?