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	Original Value	Comments

Hardness, Brinell	260	700°C tempering temperature. Quenching in oil ø 50. Test piece hardened by oil quenching from 850°C.
	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	un-machined
	275 - 320 @Diameter <=100 mm	un-machined
Hardness, Rockwell C	40	tempering temperature 500°C. Hardened by oil quenching.
	31 - 50	30 mm from the quenched end.
	49 - 60	10 mm from the quenched end.
	55	tempering temperature 200°C. Hardened by oil quenching.
Tensile Strength at Break	800 MPa	R_m. 700°C tempering temperature. Quenching in oil ø 50. Testpiece hardened by oil quenching from 850°C.
	1130 MPa	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	Rm., un-machined
	900 - 1050 MPa @Diameter <=100 mm	Rm., unmachined
Tensile Strength, Yield	700 MPa	R_e. 700°C tempering temperature. Quenching in oil ø 50. Test piece hardened by oil quenching from 850°C.
	1050 MPa	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	Re., un-machined
	>= 690 MPa @Diameter <=100 mm	Re. , un-machined
Elongation at Break	15 %	5XD. 500°C tempering temperature. Quenching in oil ø 120. Test piece hardened by oil quenching from 850°C.
	20 %	5XD. 700°C tempering temperature. Quenching in oil ø 120. Test piece hardened by oil quenching from 850°C.
	>= 12 % @Diameter <=100 mm	un-machined
	>= 14 % @Diameter 101 - 210 mm	un-machined
Reduction of Area	50 %	500°C tempering temperature. Quenching in oil ø 50. Test piece hardened by oil quenching from 850°C.
	64 %	700°C tempering temperature. Quenching in oil ø 50. Test piece hardened by oil quenching from 850°C.
	>= 50 % @Diameter <=100 mm	un-machined
	>= 55 % @Diameter 101 - 210 mm	un-machined
Impact Test	>= 25.0 J @Diameter 16.0 - 210 mm	un-machined

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

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NASSAB19 / 15037

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