This standard stipulates the most basic requirements for the B and C chromium-plated test blocks used in penetrant testing. This standard applies to the production and factory quality requirements of two types of chromium-plated test blocks B and C for penetrant inspection. JB/T 6064-1992 Technical conditions for chromium-plated test blocks for penetrant testing JB/T6064-1992 Standard download and decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
Chromium-plated test block for penetrant testing
Technical conditions
1 Subject content and scope of application
This standard is difficult to use for penetrant testing B , C two kinds of chromium-plated test blocks stipulate the most basic requirements. This standard applies to the production and factory quality requirements for penetrant inspection of BC two chromium-plated test blocks. 2 Technical requirements
2.1 Type B test block
2.1.1 Shape and size of type B chromium-plated test block The shape and size of type B chromium-plated test block are shown in Figure 1. O
*
*
*
45
2.1.2 Materials and production of test blocks
a.||tt| |2
Figure 1 Type B chromium-plated test block
9
JB/T 6064-92
The base material of type B chromium-plated test block should be a stainless steel plate (such as 1Cr18Ni9Ti , Cr17Ni2, etc.). The front (working surface) of the test block is divided into two parts along the long side: one side has a chrome-plated strip with an area of ??152mm×45mm. The h.
on this chrome-plated surface is formed by applying different loads on the back using a Brinell hardness tester. The five radial crack areas are located at intervals of 25mm and arranged in order of size (see Figure 1); the other side adjacent to the chrome-plated strip is a 0.2mm new sand blasting surface, and the air pressure during sandblasting is 0.4MPa, the background color after sandblasting should be uniform.
,
A 6 mm through hole for suspension is drilled in the middle of one end of the test block. d. The chromium plating layer on the test block should be fine and even, and the thickness of the coating should be 20~60μm. 2.1.3 Quality requirements
Approved by the Ministry of Mechanical and Electronics Industry of the People's Republic of China on 1992-05-05 172
Implemented on 1993-07-01
h.
JB/T 6064-92
When testing with penetrant systems of different sensitivities, the number of crack areas that can be displayed on the test block should be as shown in Table 1. Table 1
Sensitivity of Mu penetrant system
Low sensitivity
Medium sensitivity
High sensitivity
Super high sensitivity
Displayable Number of crack zones
23
3~4
4~5
5
When inspected with a high-sensitivity or ultra-high-sensitivity penetrant system When the diameter of each crack area on the test block is displayed from large to small, it should be as shown in Table 2.
Table 2
cut
straight
order
diameter
1
4.5~5.5www.bzxz.net
2
3.5~4.5
3
2. 4~~3. 0
4
1. 6~ 2. 0||tt| |5
mm
0.8～1.0
c． The surface roughness value R. of the chromium-plated strip of the test block should be 0.631.25 μm. The surface roughness value R. after sandblasting should be 1.25~~2.5 μm.
2.2C type test block
2.2.1 Shape and size of type C chrome-plated test block The shape and size of type C chromium-plated test block are shown in Figure 2. 70
(o||tt ||Figure 2C type chrome-plated test block
2.2.2 Materials and production of test block
a Type C chromium-plated test block is plated with a 1050um thick nickel coating on a 0.4 or 1mm thick yellow plate, and then Then apply a very thin layer of chromium coating (about 1um)
b. Stretch or bend the test piece on a press brake (the plated surface faces outward) to cause cracks in the coating, and then flatten the curved surface. Since the depth of the crack is consistent with the thickness of the coating, the depth of the crack can be controlled by adjusting the thickness of the coating. 2.2.3 Quality requirements
There are 3 C-type chrome-plated test blocks in each set, and their crack grade, crack Depth and width are shown in Table 3. 173
Crack grade
Depth D
Width W
3 mark, packaging and storage
3.1 mark| |tt||JB/T 6064-- 92
Table 3
Treading
(C,)
Coarse
40~50|| tt||medium
crack
grain
(C2)
20~30
0.1~5
pm||tt| |Fine
Crack (C;)
13
The back of the test block should be polished and marked with an etching method. The content should include the name, model, serial number, production unit and date of the test block. etc. 3.2 Packaging
3.2.1 The finished test block should be packed in a box with certain rigidity, and the box should have a soft pad and a structure for fixing the test block. The box should be accompanied by the test block's calibration certificate. Use and maintenance instructions and photos showing cracks, etc. 3.2.2
Additional instructions:
This standard is proposed by the National Technical Committee for Nondestructive Testing and Standardization. This standard is under the jurisdiction of the Shanghai Materials Research Institute of the Ministry of Mechanical and Electrical Industry. . This standard is drafted by the 621st Research Institute of the Ministry of Aerospace Industry. The main drafters of this standard are Sun Dianshou and Wang Haifeng. 174
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