TYPICAL ANALYSIS
C |
0.30 |
|
Mn |
0.50 |
Ni |
4.25 |
|
Cr |
1.25 |
Mo |
0.30 |
|
|
|
CHARACTERISTICS
This is an extremely versatile steel where great strength and toughness are required,
combined with a good wearing surface. Where extra skin hardness is required it may be
case-hardened. Alternatively, it can be supplied heat treated to 95/102 kg. f/sq. mm.,
60/65 tons f/sq. in. in which condition it is suitable for machining and requires no
further heat treatment.Colour Code: BROWN.
TYPICAL APPLICATIONS
| • |
Plastic moulds |
| • |
Machine parts requiring maximum compression strength |
| • |
Rubber moulds |
| • |
Drawing plugs (cold) |
| • |
Deep drawing dies (cold) |
| • |
Gripper dies |
| • |
Cases for cold heading, die inserts (light) |
| • |
Impact extrusion, die bases and bolsters |
| • |
Mandrels, cold tube drawing |
| • |
Bolsters for cold swaging |
| • |
Bolsters for supporting inserts in die-casting |
| • |
Thrust blocks |
| • |
Gears |
| • |
Shafts |
| • |
Arbors |
| • |
Cams |
| • |
Bolts |
| • |
Indexing pins |
| • |
Pinions |
| • |
Pistons |
| • |
Wedges |
| • |
Cases for nut forming dies |
| • |
Die-casting moulds, die-inserts, cores and ejectors |
| • |
Bending tools |
| • |
Drop stamping dies |
| • |
Hot extrusion bolsters |
| • |
Die-holders lStems |
| • |
Rams |
| • |
Gripper dies. |
|
HEAT TREATMENT
FORGING
Commence at 1150oC. Re-heat as necessary to avoid working below 850oC
ANNEALING
Soak for at least 2 hours per inch of thickness at 650oC. Cool in still air
STRESS RELIEVING
Heat uniformly to 600/630oC max. Allow to equalise and remove from furnace.
Cool in still air to room temperature
HARDENING & TEMPERING
Thoroughly warm Tools or Components before charging.
HEATING & SOAKING
(a) Salt Bath Procedure Charge Tools into Pre-heater chamber at 300/400oC
and soak thoroughly up to 1 hour per inch of ruling section. Remove to Neutral Salt Bath
operating at 820/830oC and maintain for 20 minutes at temperature or 10
minutes per inch of ruling section (whichever is greater).
(b) Open Furnace Procedure
Charge Tools into muffle furnace working at 300/400oC and soak thoroughly
(up to 1 hour per inch of ruling section). Raise heat uniformly to 820/830oC
and maintain at this temperature for sufficient time to allow the tools to equalise. Soak
for a few minutes only when this point is reached.
QUENCHING
(1) Quench in Oil - ALTERNATIVELY
(2) For Martempering, quench in Salt at 180/220oC. Allow to equalise and
cool in still air. Tools should be tempered immediately whilst still hand warm.
TEMPERING
Temper to your requirements according to the tempering graph - soaking at temperature for
1 hour per inch of ruling section or 2 hours whichever is longer. Cool in still air after
tempering. This steel should respond to hardening by the Vacuum furnace, gas quench
process. |
