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 1150°C. Re-heat as necessary to avoid working below 850°C
ANNEALING
Soak for at least 2 hours per inch of thickness at 650°C. Cool in still air
STRESS RELIEVING
Heat uniformly to 600/630vC 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 820/830°C 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 300/400°C and soak thoroughly
(up to 1 hour per inch of ruling section). Raise heat uniformly to 820/830°C
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 180/220°C. 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. |
