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Product Details

AISI 4140 Hot Rolled Alloy Round Bar

Product Information Introduce

AISI 4140 steel is a low alloy steel containing chromium, molybdenum, and manganese. It is widely used across numerous industries and is an excellent material choice due to its toughness, high fatigue strength, and abrasion and impact resistance. Not many grades can match the versatility and usefulness of 4140.

Product name		steel round bar
Size	O.D	8-480mm
	Length	1-12m
Standard		AISI,ASTM,GB,DIN,BS,JIS
Grade		4140,4130, 5140,5130
Inspection		X-ray inspection, manual ultrasopic inspection,surface inspection,hydraulic testing
Technique		Hot Rolled
Section Shape		Round
Main Market		Southeast Asia, Middle East, Australia,USA,South America,Africa
Productivity		5000 Tons/month
Packing		Standard bundle package Beveled end or as per request
Surface Treatment		Black Painted, PE Coated, Galvanized or Customized all available
Date of Delivery		According to The Specifications And the Quantities Of Each Contract, Time Start To Begin When We confirm the Date of the Earnest or L/C
Method of Payment		T/T L/C
Method Of Delivery		Terms According To the for International Trading
Remarks		1.Payment Terms T/T, L/C
		2.Trade Term:FOB/CFR/CIF
		3.Minimum Quantity of Order: 2 Tons
		4.Delivery Time:7-15 days after receipt of deposit

Applications
This alloy finds many applications as forgings for the aerospace and oil and gas industries, along with myriad uses in the
automotive, agricultural and defense industries, Typical uses are forged gears and shafts, spindles, fixtures, jigs and collars.

Grade	C	Cr	Mn	Si	Mo	S	P
4140	0.38-.43%	0.80-1.10%	0.75-1.0%	0.15-0.30%	0.15-0.25%	0-0.040%	0-0.035%

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

Heat Treatment
AISI 4140 alloy steel is heated at 845°C (1550°F) followed by quenching in oil. Before hardening, it can be normalized by heating it at 913°C (1675°F) for a long period of time, followed by air cooling.

Forging
AISI 4140 alloy steel is forged at 926 to 1205°C (1700 to 2200°F)

Hot Working
AISI 4140 alloy steel can be hot worked at 816 to 1038°C (1500 to 1900°F)

Cold Working
AISI 4140 alloy steel can be cold worked using conventional methods in the annealed condition.

Annealing
AISI 4140 alloy steel is annealed at 872°C (1600°F) followed by slowly cooling in the furnace.

Tempering
AISI 4140 alloy steel can be tempered at 205 to 649°C (400 to 1200°F) depending upon the desired hardness level. The hardness of the steel can be increased if it has a lower tempering temperature. For example, a tensile strength of 225 ksi can be achieved by tempering at 316°C (600°F), and tensile strength of 130 ksi can be achieved by tempering at 538°C (1000°F).

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

Machinability
AISI 4140 alloy steel has good machinability in the annealed condition.

Forming
AISI 4140 alloy steel has high ductility. It can be formed using conventional techniques in the annealed condition. It requires more pressure or force for forming because it is tougher than plain carbon steels.

Welding
AISI 4140 alloy steel can be welded using all conventional techniques. However, the mechanical properties of this steel will be affected if it is welded in the heat-treated condition, and post-weld heat treatment should be performed.