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SWCH8A carbon steel wire rods is Aluminum killed steel . SWCH8A is in the Japanese Industrial Standard JIS G3507 Part 2 : Wires .
Standard : JIS G3507
Grade : SWCH8A
Brand : Royal
Size of wire diameter : 5.5-34mm
SWCH8A annealing steel wire rods process methods :
(1)Process D : The Process D means a process wherein wire rods are finished by cold working .
(1)Process DA : The Process D means a process wherein wire having been cold worked are annealed and further finished by cold working or a process wherein wire rods are finished by cold working after annealing .
The steel wire rods SWCH8A shall be manufactures by process D or DA . However ,manufacturing processes other than given above may be selected by agreement between the purchaser and the supplier .
SWCH8A steel wire rods for screws mechanical properties :
Grade |
process methods |
Division of wire diameter/mm |
Tensile strength MPa |
Reduction of area % |
(Informative)Hardness HRB |
SWCH8A |
process D |
≤3 |
≥540 |
- |
- |
3~4 |
≥440 |
≥45 |
|||
4~5 |
≥390 |
||||
>5 |
≥340 |
≤85 |
|||
process DA |
- |
≥290 |
≥55 |
≤80 |
Remarks:
For wires of 20mm or over in wire diameter,the reduction of area shall be value 5 lower than the value in table 2 .For those of diameter 3mm or less,the reduction of area is not specified .
SWCH8A cold heading steel wire rods application:
SWCH8A steel wire rods for cold heading is used for the manufacture of various types of screws such as bolts,nuts,rivets,machine screws and tapping screws and various parts by cold heading .
Related Link:JIS G3508-2:SWRCHB323,SWCH6A,SWCH10A,SWCH12A,SWCH15A,SWCH16A,SWCH18A,SWCH19A,SWCH20A,SWCH22A