| |
■Inspecting of:
- No rusting, scoer, squama, stain, bending in appearance.
- Specification Tolerance
specification |
tolerance |
| ≤3mm |
+0.00mm
-0.02mm |
3<≤6mm |
+0.00mm
-0.03mm |
- Tolerance of the wire
specification |
tolerance |
| ≤3mm |
0.02mmMax |
| 3<≤6mm |
0.02mmMax |
- Tensile strength and Elongation
steel |
tensile strength
（kg/m） |
elongation |
SWCH1018A |
48-56 |
≥10 |
SWCH1022A |
48-56 |
≥10 |
- Decarburization ≤0.15mm
- Grain
：NO.6-NO.8
- Wire Chemical Composition
| STEEL |
chemical composition |
| |
C |
Si |
Mn |
P |
S |
其它 |
| SWRCH18A |
A |
0.15-0.20 |
≤0.10 |
0.60-0.90 |
≤0.030 |
≤0.035 |
Alt≥0.02 |
| SWRCH22A |
A |
0.18-0.23 |
≤0.10 |
0.70-1.00 |
≤0.030 |
≤0.035 |
Alt≥0.02 |
remark:
ways of killed oxygen code |
■ inspection of heat and surface treatment ：
| Iterm |
sample |
allowed band |
testing machine |
| appearance |
20 |
18 |
eye |
| surface hardness
|
4 |
4 |
Vicker Hardness Tester |
| centre hardness
|
3 |
3 |
Rockwell Hardness Testing |
| carburizing level |
2 |
2 |
Vicker Harkness Tester |
| bending |
8 |
8 |
Bending Hardness |
| torque |
8 |
8 |
Torque Wrench |
| driving |
25 |
25 |
Drive-in Testing |
| salt spray |
8 |
8 |
Salf spray tese Machine |
|
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