52100
[/url]IMG_7558 by Calista Anderson, on Flickr[/IMG]
4140
[/url]IMG_7556 by Calista Anderson, on Flickr[/IMG]
41100
[/url]IMG_7557 by Calista Anderson, on Flickr[/IMG]
440C
[/url]IMG_7560 by Calista Anderson, on Flickr[/IMG]
The first three graphs show the hot twist data for three different steels. The test is done in a hot forge chamber, 5/8 inch material is used and is twisted to fracture. The number of twists is noted. The torque in inch pounds is also measured for the specific temperature.
For the 52100 there is a sharp drop off in number of twists to fracture after 2250' f.
Comparison of the 4140 and the 41100 shows that forgeability drops off with an increase in carbon content. It also shows that an increase in torque is needed at lower temperatures with the higher carbon content.
440C graph is a hot ductility curve. It shows the percentage of reduction obtained at certain temperatures. With all stainless steels and high alloy steels there is a drop in ductility after a optimum peak temperature is reached.
This testing was done for the forging industry to provide optimum forging temperatures. In some cases the recommended temperature may not be the best for knife forging.
Hoss
4140
41100
440C
The first three graphs show the hot twist data for three different steels. The test is done in a hot forge chamber, 5/8 inch material is used and is twisted to fracture. The number of twists is noted. The torque in inch pounds is also measured for the specific temperature.
For the 52100 there is a sharp drop off in number of twists to fracture after 2250' f.
Comparison of the 4140 and the 41100 shows that forgeability drops off with an increase in carbon content. It also shows that an increase in torque is needed at lower temperatures with the higher carbon content.
440C graph is a hot ductility curve. It shows the percentage of reduction obtained at certain temperatures. With all stainless steels and high alloy steels there is a drop in ductility after a optimum peak temperature is reached.
This testing was done for the forging industry to provide optimum forging temperatures. In some cases the recommended temperature may not be the best for knife forging.
Hoss
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