Not to be confused with other steels in the 440 range, 440C is an excellent stainless blade steel.
|Part Number||Steel Type||Dimensions (Imperial)||Dimensions (Metric)|
|440C-103-2-36||440C||0.103/0.113 x 2 x 36″||2.6 x 50 x 900 mm|
|440C-103-3-36||440C||0.103/0.113 x 3 x 36″||2.6 x 75 x 900 mm|
|440C-156-3-36||440C||0.140/0.156 x 3 x 36″||3.5 x 75 x 900 mm|
|440C-172-3-36||440c||0.172/0.188 x 4 x 36”||4.5 x 75 x 900 mm|
|440C-207-4-36||440C||0.207/0.227 x 4 x 36″||5.25 x 100 x 900 mm|
|Dimensions||90 x 7.5 x 0.45 cm|
Chemistry: Typical Chemistry: Carbon 0.95/1.20 Manganese 1.00 Silicon 1.00 Phosphorus 0.040 Sulfur 0.03 Chromium 16.00/18.00 Molybdenum 0.75 Supplied: Annealed and black (mill scale) Annealing: typical Heat uniformly, 843/871c Soak and cool very slow in furnace, Hardening: Heat 440c stainless steel to 1010-1066c soak, quench in warm oil or air cool. Do not over heat, when overheated maximum hardness cannot be obtained. Take care to minimize temperature time at 1099c to avoid excessive grain growth. For best corrosion resistance, temper below or around 427c. Tempering: Before tempering make sure 440c stainless steel parts are to room temperature after hardening. This will complete the transformation of martensite, which is necessary to prevent non-uniform structures and hardness. Following are tempering temperatures vs hardness, based on steel hardened at 1040c, quenched in warm oil and tempered for 1 hour.
For more information on heat treating blades, ABS Mastersmith Kevin Cashen has an excellent site: http://www.cashenblades.com/info.html
|Tempering Temperature||Rockwell Hardness|