420 VAR
VACUUM ARC REMELTED - MOLD QUALITY
DSS #420
420 VAR is best suited for molds that demand high
hardness, excellent polishability, good corrosion resistance and good wear resistance.
It is the best choice for lens quality molds and molds used to form poly-vinyl
chlorides (PVCs).
| Grade Name: |
420 VAR (DSS #420) |
| Chemistry: |
| C |
|
Si |
|
Mn |
|
Cr |
|
V |
| 0.38% |
|
.80% |
|
.50% |
|
13.60% |
|
0.30% |
|
| Applications: |
Plastic Molds - Injection and compression
Gauges
Valves
Cams
Gears
Shafts
Ball Bearings
Surgical and Dental Instruments |
| Heat Treatment: |
Vacuum furnace is recommended.
Annealing Temp: 1500º F- furnace cool at 25º F/hr to 1100º F then air cool
Pre-heat temp: 1250º F - 1350ºF
Austenitizing Temp: 1850º F - 1900º F
Quench Medium: Vacuum back fill or air
Tempering Temperature: 400º F - 700º F depending on required hardness. Double
tempering is recommended. Tempering in a range of 800º F - 1000º F should be
avoided. |
| Welding Specs: |
Welding Rod: 420 SS
Pre-Heat temperature: 450º F
Post-Heat temperature: 475º F
2nd temper: 475º F |
| Surface Coating: |
Surface coatings are not recommended for 420
VAR, but is capable of
receiving some of today's surface coatings. Check with your DSS sales representative
or with any of the quality coatings companies. |
420 FM
MODIFIED 420SS-RESULPHURIZED PREHARD
34/40 RcH
DSS #420F
| Grade Name: |
420 FM (DSS #420F) |
| Chemistry: |
| C |
|
Cr |
|
Mo |
|
S |
| 0.36% |
|
16.00% |
|
1.20% |
|
0.15% |
|
| Applications: |
Plastic Injection-mold frames, Holders and Stripper Plates -
in conjunction with 420 SS inserts. 420 FM is ideal to use when the die inserts are
420 SS because it has none of the corrosion associated with dissimilar metals. Its
higher hardness results in better abrasion resistance, higher yield strength, higher
coining resistance and better fatigue life. |
| Heat Treatment: |
420 FM is provided heat-treated at 34/40 RcH and subsequent
heat treating is unnecessary. |
| Welding Specs: |
Welding Rod: 420 SS
Pre-Heat temperature: 450º F
Post-Heat temperature: 850º F/900º F |
| Surface Coating: |
Not Recommended |
|
|
