金相分析、机械性能测试、失效分析、焊接工艺评定
打广告不想交钱呀！！！！ 呵呵o(∩_∩)o... 希望有机会跟大家合作。 广告费 用 是规定的 5热处理币？ 不是。没有广告费用。 你们试验室允许客户参观不？ 你们试验室允许客户参观不？cqitstudent 发表于 2011-6-11 13:17 http://www.rclbbs.com/images/common/back.gif
这话问得好！:lol
悄悄问一句：可否提供焊接宏观评定图谱指南？ 欢迎参观。可以提供相关标准。 欢迎参观，来人来函。 回复 10# gmi
留一个联系方式吧。谢谢！ 联系方式在1楼 热处理技术员的残奥有点多，检测HRC硬度肯定不行。 请大家告诉大家 我们这也可以来参观SGS还委托我们做呢
http://www.etc-sbc.com/ SGS还招理化人员不？ 你看招聘网站吧，相关招聘信息都会在网站上公布。 标题党，有一种被骗进来的感觉! 幼稚。即使有被骗的感觉也不能讲啊。 1. Description of the submitted samples:
Two containers and some parts were received from Elo company, on both of containers there are two internal thread bushings and two external thread bushings, defects were found on internal thread bushing surface , crack was found in the external thread bushing.
Some tests as below were done to analyze the reasons which cause defect and crack.
The states of the samples are illustrated in the following form.
Sample state Sample number
￠18x3Pipe ￠35Bar
Perfect 1-1 2-1
Defect on surface 1-2 2-2
Crack 1-3 2-3
2. Hardness test:
Test method: GB/T4340.1-2009
Six parts of samples were cut and taken to do vickers hardness, which is “perfect”, “defect on surface”
and“Crack”, respectively. The results are illustrated in the following form.
Test Item Test location Sample number Result Require Conclusion
HV1.0 Section 1-1 174 184 172 HV≤200 Pass
1-2 190 164 160
1-3 188 194 162
2-1 275 258 269 Fail
2-2 269 262 248
2-3 291 281 288
3. Nonmetallic Inclusion content test:
Test method: GB/T 10561-2005
Result: The grade of the inclusion content is illustrated in the following form. The longest length ofthe inclusions in sample 2-3 is 2mm.
Sample number Result
Type A Type B Type C Type D Type DS
Fine Coarse Fine Coarse Fine Coarse Fine Coarse
1-1 1.0 - 2.0 - 0.5 - 1.0 - 1.5
1-2 0.5 - 2.5 - 0.5 - 1.5 - 0
1-3 0.5 - 3.0 - 0.5 - 1.0 - 0
2-1 3.0 - 0.5 - 3.0 - 1.0 - 2.0
2-2 2.0 - 0.5 - - 2.5 0.5 - 1.0
2-3 2.5 - 3.0 - Over 3.0 - 1.0 - 1.5
4. Metallographic analysis:
Teat method: GB/T13298-1991
Result: Equiaxed grain is observed on sample 1# and 2#, there are some carbide on grain side of 1-3and 2-3because of welding, there are more deformationmartensiteon sample 2-1,2-2,2-3 than 1-2,1-3,which make 2# is harder than 1#.The separatedcarbide on grain side will reducethe material’s corrosion resistant ability. The folder is found on the surface of sample 1-2.
Fig1 1-1 200×
Fig. 2 1-2 200×
Fig. 3 1-3 200×
Fig.4 2-1 200×
Fig. 5 2-2 200×
Fig.6 2-3 200×
Fig. 7 2-3 500×
Fig.8 the size of the defect on the surface of sample 1-2 100×
5. SEM analysis:
Test method: SEM
Result：There are some cavities on the fracture surface of 2-3(see Fig.9), there are some nonmetal material which make the sample of 1-3 have defects on surface(see Fig.10), the defect is folder equal to Fig.8.
Fig.9 2-3 1000X
Fig.10 1-3 200X
6. Chemical composition analysis:
Test method: OES
Element Sample C Si Mn P S Cr Ni Mo N Conclusion
Requirement - ≤0.030 ≤1.00 ≤2.00 ≤0.045 ≤0.030 16.0-18.0 10.0-14.0 2.0-3.0 ≤0.10
Result ,% 1-1 0.015 0.35 1.03 0.031 0.0042 16.81 12.54 2.05 0.052 Pass
1-2 0.020 0.34 1.09 0.041 0.0036 16.68 10.12 2.11 0.043 Pass
1-3 0.020 0.34 1.10 0.042 0.0036 16.65 10.13 2.10 0.043 Pass
2-1 0.043 0.56 0.84 0.036 0.011 16.77 10.08 2.10 0.049 C Fail
2-2 0.043 0.57 0.85 0.036 0.012 16.76 10.12 2.12 0.050 C Fail
2-3 0.044 0.58 0.92 0.035 0.012 16.57 10.12 2.07 0.046 C Fail
Conclusion: Through the tests on the samples of 1-1,1-2,1-3,2-1,2-2,2-3, we know the grade of the nonmetal inclusion content of samples of￠35 bar are all beyond the requirement (The grade of nonmetal inclusion content is decided by buyer and seller. Generally, the sum of all grades should not exceed 5), so the parts made out of ￠35 bar are not suit for pressure vessel. Because of the separated carbide on grain side, the service life of 2-3 sample will shorter than others. As talk about ￠18×3 pipe, the grade of nonmetal inclusion content is almost up to the mustard, but the folder on surface will have negative influence on the mechanical property, so before put into use the parts surface should be check first, the parts with vice should not be put into use. Finally, the container’s weld pass should be check by RT or UT pro rata.
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