Assab Steels 709M Machinery Steel

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Assab Steels 709M Machinery Steel
Categories:	Metal; Ferrous Metal; Alloy Steel
Material Notes:	ASSAB 709M is an alloyed machinery steel with high strength in small and medium sizes. As standard ASSAB 705M is supplied tough hardened requiring no further heat treatment. It can be oil hardened to higher mechanical properties. Applications: ASSAB 709M is suitable for flame and induction hardening. It can also be nitrided or tuffrided to a surface hardness of 600-650 Vickers. ASSAB 709M is not suitable for welding but can with certain precautions be repair welded. Typical applications include shafts and other power transmission components as well as high strength bolts. AISI /SAE 4140, DIN 42CrMo4, W.nr. 1.7225, BS 708M42, AFNOR 42CD4, JIS SCM4, SS 2244
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Mechanical Properties	Metric	English	Comments

Hardness, Brinell	260	260	700°C tempering temperature. Quenching in oil ø 50. Test piece hardened by oil quenching from 850°C.
	370	370	500°C tempering temperature. Quenching in oil ø 50. Test piece hardened by oil quenching from 850°C.
	245 - 290 @Diameter 101 - 210 mm	245 - 290 @Diameter 3.98 - 8.27 in	un-machined
	275 - 320 @Diameter <=100 mm	275 - 320 @Diameter <=3.94 in	un-machined
Hardness, Rockwell C	40	40	tempering temperature 500°C. Hardened by oil quenching.
	31 - 50	31 - 50	30 mm from the quenched end.
	49 - 60	49 - 60	10 mm from the quenched end.
	55	55	tempering temperature 200°C. Hardened by oil quenching.
Tensile Strength at Break	800 MPa	116000 psi	R_m. 700°C tempering temperature. Quenching in oil ø 50. Testpiece hardened by oil quenching from 850°C.
	1130 MPa	164000 psi	R_m. 500°C tempering temperature. Quenching in oil ø 50. Test piece hardened by oil quenching from 850°C.
Tensile Strength, Ultimate	800 - 950 MPa @Diameter 101 - 210 mm	116000 - 138000 psi @Diameter 3.98 - 8.27 in	Rm., un-machined
	900 - 1050 MPa @Diameter <=100 mm	131000 - 152000 psi @Diameter <=3.94 in	Rm., unmachined
Tensile Strength, Yield	700 MPa	102000 psi	R_e. 700°C tempering temperature. Quenching in oil ø 50. Test piece hardened by oil quenching from 850°C.
	1050 MPa	152000 psi	R_e. 500°C tempering temperature. Quenching in oil ø 50. Test piece hardened by oil quenching from 850°C.
	>= 600 MPa @Diameter 101 - 210 mm	>= 87000 psi @Diameter 3.98 - 8.27 in	Re., un-machined
	>= 690 MPa @Diameter <=100 mm	>= 100000 psi @Diameter <=3.94 in	Re. , un-machined
Elongation at Break	15 %	15 %	5XD. 500°C tempering temperature. Quenching in oil ø 120. Test piece hardened by oil quenching from 850°C.
	20 %	20 %	5XD. 700°C tempering temperature. Quenching in oil ø 120. Test piece hardened by oil quenching from 850°C.
	>= 12 % @Diameter <=100 mm	>= 12 % @Diameter <=3.94 in	un-machined
	>= 14 % @Diameter 101 - 210 mm	>= 14 % @Diameter 3.98 - 8.27 in	un-machined
Reduction of Area	50 %	50 %	500°C tempering temperature. Quenching in oil ø 50. Test piece hardened by oil quenching from 850°C.
	64 %	64 %	700°C tempering temperature. Quenching in oil ø 50. Test piece hardened by oil quenching from 850°C.
	>= 50 % @Diameter <=100 mm	>= 50 % @Diameter <=3.94 in	un-machined
	>= 55 % @Diameter 101 - 210 mm	>= 55 % @Diameter 3.98 - 8.27 in	un-machined
Impact Test	>= 25.0 J @Diameter 16.0 - 210 mm	>= 18.4 ft-lb @Diameter 0.630 - 8.27 in	un-machined

Component Elements Properties	Metric	English	Comments
Carbon, C	0.42 %	0.42 %
Chromium, Cr	1.05 %	1.05 %
Iron, Fe	97.33 %	97.33 %
Manganese, Mn	0.75 %	0.75 %
Molybdenum, Mo	0.20 %	0.20 %
Silicon, Si	0.25 %	0.25 %

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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NASSAB19 / 15037

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