金相分析、机械性能测试、失效分析、焊接工艺评定

gmi

HRC

打广告不想交钱呀！！！！

gmi

呵呵o(∩_∩)o...

gmi

希望有机会跟大家合作。

hooloo

广告费   用 是规定的 5  热处理币？

gmi

不是。没有广告费用。

cqitstudent

你们试验室允许客户参观不？

hotblood62

你们试验室允许客户参观不？
cqitstudent 发表于 2011-6-11 13:17

    这话问得好！

    悄悄问一句：可否提供焊接宏观评定图谱指南？

gmi

欢迎参观。可以提供相关标准。

gmi

欢迎参观，来人来函。

hotblood62

回复 10# gmi


    留一个联系方式吧。谢谢！

gmi

联系方式在1楼

gmi

热处理技术员的残奥有点多，检测HRC硬度肯定不行。

gmi

请大家告诉大家

flc1212

我们这也可以来参观  SGS还委托我们做呢
http://www.etc-sbc.com/

cqitstudent

SGS还招理化人员不？

gmi

你看招聘网站吧，相关招聘信息都会在网站上公布。

君子山

标题党，有一种被骗进来的感觉!

gmi

幼稚。即使有被骗的感觉也不能讲啊。

gmi

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
        ￠18x3  Pipe        ￠35  Bar
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 of  the 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 1-3  and 2-3  because of welding, there are more deformation  martensite  on sample 2-1,2-2,2-3 than 1-2,1-3,which make 2# is harder than 1#.The separated  carbide on grain side will reduce  the 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.