Alloy Steel
	Yield Strength MPa (psi)	Base Hardness, Rockwell	Available Hardness, Rockwell	OD Wear Resistance	Root Wear Resistance	Coorosion Resistance
AISI 4140	689 (100,000)	28-32 Rc	48-55 Rc1	Fair	Poor	Poor
AISI 4340	758 (110,000)	28-32 Rc	48-55 Rc1	Fair	Poor	Poor
Nitralloy 135M	586 (85,000)	33 Rc	60-70 Rc2	Good	Good	Poor

Stainless Steel
	Yield Strength MPa (psi)	Base Hardness, Rockwell	Available Hardness, Rockwell	OD Wear Resistance	Root Wear Resistance	Coorosion Resistance
304	241 (35,000)	80 Rb	90 Rb	Poor	Poor	Good
316	241 (35,000)	95 Rb	90 Rb	Poor	Poor	Good
416	793 (35,000)	30 Rb	30 Rb	Poor	Poor	Fair/Good
17-4PH	1207 (175,000)	38 Rb	42 Rb	Poor	Fair/Poor	Good

Tool Steel
	Yield Strength MPa (psi)	Base Hardness, Rockwell	Available Hardness, Rockwell	OD Wear Resistance	Root Wear Resistance	Coorosion Resistance
D-2	2068 (300,000)	96 Rb	58-60 Rc3	Good	Good	Poor
CPM 9-V	1965 (285,000)	52-55 Rc	52-54 Rc4	Excellent	Excellent	Fair
CPM S90V	2241 (325,000)	30 Rc	56-59 Rc4	Good	Good	Good
H-13	2068 (300,000)	96 Rb	50-60 Rc4	Good	Good	Fair

Specialty Steel
	Yield Strength MPa (psi)	Base Hardness, Rockwell	Available Hardness, Rockwell	OD Wear Resistance	Root Wear Resistance	Coorosion Resistance
Duranickle 301	862 (125,000)	30-38 Rc	32 Rc	Poor	Poor	Excellent
Hastelloy® C-276	552 (80,000)	86 Rb	86 Rb	Poor	Poor	Excellent

Flite Technology can pretty much made an extrusion screw using just amount any type or grade of steel. The steel can be heat treated, nitrided, plated, coated, hardfaced or encapsulated. We make them out of plastic as well.

Most common are 4140, 4340 HT. 300 and 400 series stainless steel. Others are 17-4 ph stainless, En41B, 38CrMoAlA, SKD11 and SKD61. Tool steels, D-2, H13, Megaware, CPM-9V, CPM-420V. For corrosive applications, Inconel, 713, 718 and 625. Also various grades of Hastelloy and Duranickel.