20cr precision steel

20cr precision steel
 

Product description:

20cr precision steel

Material piston pin, precision steel heat treatment plant in Shandong http: //www.sdlggg.com20cr precision steel

Excerpts: JB / T 8118-1997 (internal combustion piston pin and technical conditions), on materials, heat treatment of contents:

4.3.1 carburizing piston pin bore surface of decarbonization shall comply NJ326

4.3.2 In 20cr precision steel case depth requirements piston pin

Case depth should be hypereutectoid layer plus 1/2 plus eutectoid layer transition. Outer surface of the piston pin, the bore surface carburized layer depth shall comply with the provisions in Table 1.

Table 1

Wall thickness mm piston pin
The outer surface of the case depth mm
The bore surface case depth mm
Inner and outer peripheral surface of the carburized layer depth and thickness proportion%

1.5~3
≥0.25
≥0.05
≤40

) 3~4
≥0.30
≤35

) 4~6
≥0.40
≥0.10

) 6~8
0.50~1.20
≥0.40
≤33

) 8~10
0.60~1.20

) 10
0.80~1.70
-

Note: When the bore surface is not carburizing, carburizing layer depth from the outer surface of the product design requirements.

4.3.3 In case depth requirements piston pin

Hardening depth means the outer surface of the piston pin to the internal regulations of the vertical distance between the hardness value of high-quality carbon structural steel, boundaries hardness value 550HV;. Of alloy steel, boundaries hardness value 500HV hardened layer depth shall comply with the tables. 2 regulations.

Table 2

Wall thickness mm piston pin
The outer surface of the hardened layer depth mm
The bore surface hardened layer depth mm
Inner and outer peripheral surface of the hardened layer depth and thickness proportion accounted%

1.5~3
≥0.25
≥0.10
≤40

) 3~5
≥0.30
≤35

) 5~10
0.60~1.50
0.60~1.70

) 10~20
0.80~1.70
0.80~1.90
-

) 20
1.0~2.0

4.4 Hardness

4.4.1 The outer surface of the pin hardness carburizing piston should be 58-64HRC, there are volume stability requirements, its outer surface hardness of 56 ~ 64HRC. Same piston pin on the hardness difference should be less than or equal to 3 units.

4.4.2 piston pin core hardness should be consistent with the provisions in Table 3.

TABLE 3

Wall thickness mm piston pin
HRC hardness of heart

20 steel
15Cr, 20Cr
20Mn2

1.5-10
≤38
24-46
24-48

) 10-18
-
20-40

Note: The use of other alloy steel piston pin, the core hardness by product design requirements.

4.5 20cr precision steel microstructure

Piston pin microstructure shall comply with JB / T 8118.2-1999, and other alloy steel JB / T 8118.2-1999 other than those manufactured piston pin, its microstructure by product design requirements.

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