Hardening Process

Hardening Process
Temperature for hardening, tempering, annealing.

Grade	Annealing	Hardening	Tempering
* C – 45 *	600 –650	830 – 860	380 – 440
C – 55	600 –650	820 – 850	390 – 450
C – 80	600 –650	780 - 810	430 – 510
C – 98	620 –670	770 – 800	280 – 340

* Water Quench, rest Oil Quench

lower range of temperatures should be selected for thinner sections and higher range for thicker sections. 10 to 20 C more temperature is advisable as correction factor as well as to take care of drop due to time lapse when quenching. Components should be progressively and uniformly heated to the temperaturees and hold at maximum temperature depending on cross section. (ideal ratio is 60 minfor 25 mm).

Quenching should be done immediately without any loss of time and minimum exposure to atmosphere, quenching media should be at room temperature, it should have an agitator and water circulation to keep temperatures as low as possible; tempering should be done immediately after for uniform results different coils should be heat treated seperately.

In parts where it is difficult to check hardness due to forming it is advisable to process strip of 1" x 1" alongwith components so that hardness can be checked properly.

Thickness Tolerance

All strips supplied by us are processed from coils in width range of 250-350 mm and comes with in following thickness tolerance.

Thickness	Tolerance on thickness In length	Thickness tolerance in width
0.20	+/- 0.02 mm	+/- 0.01 mm
0.25 – 0.40 mm	+/- 0.03 mm	+/- 0.013 mm
0.45 – 0.90 mm	+/- 0.04 mm	+/- 0.03 mm
1.00 – 1.80 mm	+/- 0.05 mm	+/- 0.025 mm
2.0 – 2.60 mm	+/- 0.06 mm	+/- 0.03 mm
2.6 – 4.00 mm	+/- 0.07 mm	+/- 0.04 mm