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AISI 4140 Suppliers - 709 Steel Equivalent, SCM440, EN19, 1.7225 High Tensile Steel (42CrMo4)

E Steel supply AISI 4140 Alloy Steel to Melaka Taming Sari , more information please visit : https://www.ecarbonsteel.com/index.php?ws=latestnews&nid=94514

E Steel supply 4140QT (105KSI) High Tensile Steel to Petronas Projects , and requested to perform King Brinell Tester : https://www.ecarbonsteel.com/index.php?ws=latestnews&nid=96484
E Steel has weekly shipment to Singapore, and supplying 3tons of 4140QT (also known as 709) Steel Bar to Singapore : https://www.ecarbonsteel.com/index.php?ws=latestnews&nid=116977

709 High Tensile Machinery Steel is equivalent to

Country	USA	German	British	Japan	China	Australia
Standard	ASTM A29	DIN 17200	BS 970	JIS G4105	GB/T 3077	AS 1444
Grades	4140	1.7225/ 42crmo4	42CrMo4	SCM440	42CrMo	4140

Mechanical Properties Requirements of EN19 Steel in Condition “T” – to AS 1444-1996

Section mm	0.2% Proof Stress MPa	Tensile Strength MPa	Elongation on 5.65√So %	Impact Izod Charpy J J	Hardness HB
*up to 63	680 n	850 – 1000	14	– –	248 – 302
*up to 100	665 min	850 – 1000	15	54min 50min	248 – 302

** Applies only to bars bright drawn after hardening and tempering

MECHANICAL PROPERTIES of SCM440 Steel – Hardened and tempered in section size listed

Section mm	Yield Strength MPa	Tensile Strength MPa	Elongation %	Impact Izod J	Hardness HB
50	770	930	17	90	275
100	710	920	15	70	270
200	570	850	14	60	250

** Typical Mechanical Properties for guidance only

Heat Treatment for 42CrMo4 / SCM440 Steel Shaft

Annealing

Heat to 800 oC – 850 oC, hold until temperature is uniform throughout the section and cool in furnace.

Flame or Induction Hardening

Alloy Steel 7225, hardened and tempered bar can be further surface hardened by either the flame or induction hardening methods resulting in a case hardness in excess of Rc 50.

Parts should be heated as quickly as possible to the austenitic temperature range (840 C – 870 C) and “required case depth followed by an immediate oil or water quench, depending upon hardness required, workpiece” size/shape and quenching arrangements.

“Following quenching to hand warm, most components should be tempered between 150 C – 200 C to remove” quenching stresses in the case. This will have little effect on case hardness and will reduce the risk of grinding cracks.

Hardening

Machinery Steel 4140QT , Heat to 840 oC – 875 oC, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes per 25 mm section, and quench in oil, water, or polymer as required.

*Temper immediately while still hand warm.

Nitriding

EN19 steel with hardened and tempered bar can also be successfully nitrided, giving a surface hardness of up to Rc 60. Nitriding is carried out at 490 oC – 530 oC, followed by slow cooling (no quench) reducing the problem of distortion. Parts can therefore be machined to near final size, leaving a grinding allowance only. The tensile strength of the core is usually not affected since the nitriding temperature range is generally below the original tempering temperature employed.

Normalizing

Heat to 870 oC – 900 oC, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes and cool in still air.

Stress Relieving

Heat to 680 oC – 700 oC, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm section, and cool in still air.

Tempering

Re-heat to 550 oC – 700 oC as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air.

*** Notes on Heat Treatment

Heating temperatures, rate of heating and soaking times will vary due to factors such as work piece size/shape also furnace type employed, quenching medium and work piece transfer facilities etc.. Please consult your heat treater for best results.

Machining

42CrMo4 (4140QT) in the hardened and tempered as supplied condition has good to very good machinability and operations such as sawing, turning, drilling, broaching, hobbing, milling and tapping can be carried out satisfactoraly using machine manufacturers recommendations for suitable tool type – feeds and speeds.

Welding

Welding of AISI4140 in the hardened and tempered condition (as normally supplied), is not recommended and should be avoided if at all possible, as the mechanical properties will be altered within the weld heat affected zone. It is preferred that welding be carried out on 4140 while in the annealed condition, and that the work piece, immediately on cooling to hand warm, is then stress relieved at 595 oC – 620 oC prior to hardening and tempering.

If welding in the hardened and tempered condition is really necessary, then the work piece, immediately on cooling to hand warm, should be if possible stress relieved at 15 oC below the original tempering temperature (if known).

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AISI 4140 | 709 Steel | SCM440 | EN19 High Tensile Steel