 |
 |
| 410
/ 420 Stainless Steel | 416 Stainless Steel |
| |
| Typical Analysis : |
Grade |
Carbon |
Manganese |
Phosphorous |
Sulphur |
Silicon |
Chromium |
AISI 410 |
0.10% |
0.80% |
0.030% |
0.010% |
0.20% |
11.5% |
|
0.14% |
0.90% |
max |
max |
0.40% |
12.5% |
AISI 420 |
0.17% |
0.70% |
0.030% |
0.010% |
0.20% |
12.00% |
|
0.20% |
0.80% |
max |
max |
0.40% |
13.00% |
|
| |
| Applications :
|
Capability of hardening and tempering
makes this material suitable for applications like- Shafts,
valve bodies requiring corrosion and heat resistance with a
combination of strength and fatigue.
AISI 410/420- Supply condition -Ingot route material hot rolled
to sizes up to 160 mm dia, followed by hardening and tempering.
Peeling is done as per customer requirements. Blocks are used
by Forging Industries for forging the components desirous of
corrosion and heat resistance in the applications up to 815
°C.
Sections greater than 160mm dia are forged from bigger ingots
(3T to 13T weight). Forging is done either at Bharat Forge or
other forging units. |
| |
| Heat Treatment : |
|
Normalizing : Not recommended.
Annealing : Can be Process/Full/Isothermal
annealed.
Heat Treatment |
GradeAISI |
Temp °C |
Hardness |
Remarks |
Process Anneal |
410 |
650/760 |
86/92 HRB |
Controlled atmosphere |
420 |
675/760 |
94/97 HRB |
|
Isothermal |
410 |
830/885 |
85 HRB |
Slow cooling to 705 °C Hold for 6 hrs |
420 |
830/885 |
95 HRB |
Slow cool to 705 °C Hold for 2 hrs |
Full Anneal |
410 |
830/885 |
75/85 HRB |
Controlled atmosphere Slow cool @ 17/23 °C/hr to 595 °C for severe forming applications |
420 |
|
86/95HRB |
Hardening |
410 |
925/1010 |
375/415HB |
As quench hardness |
420 |
980/1065 |
448/564HB |
As quench hardness |
Tempering |
410 |
205/370 |
38/47HRC |
Stabilize at –76 to -195 °C |
420 |
205/370 |
48/56HRC |
Stabilize at –74 °C |
Nitriding |
410 |
Not recommended |
420 |
Can be to 0.203 mm max
case depth. |
|
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RECOMMENDED PROCESSING
SEQUENCE :
- Forging
- Annealing
- Rough machine
- Stress relieve
- Finish machine
- Preheat
- Austenitise
- Oil quench
- Stabilize optional
- Temper (double temper for better impact properties)
- Final grinding
- Nitriding-if required
Note : The above two grades can be supplied through ESR (Electro Slag Remelting) route also. |
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