AISI 4140 AISI 4140 Q+T Round Bar Sales Promotion after coronavirus .

AISI 4140 Q+T Round Bar Sales Promotion

AISI 4140 AISI 4140 Q+T Round Bar Sales Promotion after coronavirus . Thanks for all your attention to us for China . We are fine now . We are back to office with facemask . And everything like before , surely we may work very hard in this year . Most of Mill Steel factory have resumed production from last week . All productions are fully stocked . Just send your new inquiry to us to get the price . And the AISI 4140 materials may have new discount now . Please contact with us directly .

AISI 4140 Q+T Round Bar Sales Promotion after Chinese Spring Festival holiday . Due to coronavirus , all company in China have delay to work after Chinese New Year . But the strictly situation only for Wuhan . All have controlled by government . We all back to office this week , and most of important company have resumed production last week .

In the beginning of this month , we have AISI 4140 Q+T Round Bar Sales Promotion . Thanks all our regular customer to care about our healthy and situation . The details please take the below information for confirm .

AISI 4140 Q+T Round Bar Sales Promotion Chemical Composition

Standard	Grade	C	Mn	P	S	Si	Ni	Cr	Mo
ASTM A29	4140	0.38-0.43	0.75-1.00	0.035	0.040	0.15-0.35	–	0.8-1.10	0.15-0.25
EN 10250	42CrMo4/ 1.7224	0.38-0.45	0.6-0.9	0.035	0.035	0.4	–	0.9-1.2	0.15-0.30
JIS G4105	SCM440	0.38-0.43	0.60-0.85	0.03	0.03	0.15-0.35	–	0.9-1.2	0.15-0.30

Mechanical Properties of AISI Alloy 4140 Steel Bar, Plates, Square

Properties	Metric	Imperial
Tensile strength	655 MPa	95000 psi
Yield strength	415 MPa	60200 psi
Bulk modulus (typical for steel)	140 GPa	20300 ksi
Shear modulus (typical for steel)	80 GPa	11600 ksi
Elastic modulus	190-210 GPa	27557-30458 ksi
Poisson’s ratio	0.27-0.30	0.27-0.30
Elongation at break (in 50 mm)	25.70%	25.70%
Hardness, Brinell	197	197
Hardness, Knoop (converted from Brinell hardness)	219	219
Hardness, Rockwell B (converted from Brinell hardness)	92	92
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only)	13	13
Hardness, Vickers (converted from Brinell hardness)	207	207
Machinability (based on AISI 1212 as 100 machinability)	65	65

Forging

Preheat the steel carefully, heat to 1150 oC – 1200 oC maximum, hold until temperature is uniform throughout the section.
Do not forge below 850 oC.Following forging operation the work piece should be cooled as slowly as possible.

AISI 4140 Steel Grade Heat Treatment

Annealing
Heat ASTM 4140 steels to 800 oC – 850 oC, hold until temperature is uniform throughout the section and cool in furnace.
Normalizing
Heat steel alloy 4140 to 870 oC – 900 oC, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes and cool in still air.
Tempering
Re-heat 4140 grade steel 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.

Hardening of AISI Alloy Steel 4140

AISI alloy 4140 steel bar, plate and square can be hardened by cold working, or heating and quenching.

SAE 4140 alloy steel is usually supplied ready heat treated to hardness in 18-22 HRC. If further heat treatment is required, then 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.