Aisi 4140 Alloy Steel Flat Bar

Aisi 4140 Steel Flat Bar

4140 Alloy Steel Flat Bar is a cold drawn annealed steel with relatively high hardenability, its chromium content provides good hardness penetration, while molybdenum imparts uniformity of hardness and high strength. 4140 Alloy Steel Flat Bar responds well to heat treatment and is relatively easy to machine in the annealed condition. 4140 Alloy Steel Flat Bar has good strength and wear resistance, excellent toughness, good ductility, and the ability to resist stress at elevated temperatures.

AISI 4140 Flat Bar: Comprehensive Property Table

(Per ASTM A829 / EN 10083-1 Standards)

Property	Annealed State	Quenched & Tempered (QT)	Key Significance
Chemical Composition (%)	C:0.38-0.43<br>Cr:0.80-1.10<br>Mo:0.15-0.25<br>Mn:0.75-1.00	-	Alloy backbone for deep hardenability
Tensile Strength (MPa)	655 - 850	950 - 1200	Excels in load-bearing tooling frames
Yield Strength (MPa)	≥ 415	≥ 750	Resists permanent deformation
Elongation (%)	≥ 16	≥ 12	Maintains ductility after hardening
Hardness (HB)	197 - 241	280 - 350	Surface wear resistance
Impact Toughness (J)	45 - 55	30 - 40	Absorb sudden shocks (e.g., press beds)
Thermal Conductivity (W/m·K)	42.6	-	Moderate heat dissipation
Machinability Rating	70%(vs. 1215 steel)	-	Superior chip-breaking efficiency

What is 4140 Flat Steel?

4140 Flat Steel is an alloy steel that contains alloying elements such as chromium, molybdenum, and carbon. 4140 steel is known for its excellent mechanical properties, including high strength, toughness, and wear resistance. This makes it well suited for a wide range of industrial applications.

AISI 4140 Chemical Composition	C	Mn	Si	P	S	Cr	Mo
	0.38-0.43	0.75-1.00	0.15-0.35	0.035 max	0.040	0.80-1.10	0.15-0.25

Applications of AISI 4140 Alloy Steel Flat Bar

Typical uses for 4140 include:

Gears:

Utilized in the fabrication of gears for machinery and automotive systems, where 4140 steel's high strength and wear resistance contribute to the durability and efficient operation of the gears.

Crankshafts:

Found in the manufacturing of crankshafts for engines, particularly in the automotive and aerospace industries, taking advantage of 4140 steel's robust properties for reliable and high-performance engine operation.

Suspension Systems:

Applied in the production of components for suspension systems in vehicles, providing the necessary strength and toughness to withstand dynamic loads and ensure stability.

Bulldozer Blades:

Used for constructing bulldozer blades due to its excellent combination of hardness and toughness, making the blades resistant to wear and impact during heavy-duty earthmoving applications.

Oil and Gas Equipment:

Employed in the manufacturing of components for oil and gas exploration and extraction equipment, where the steel's strength and resistance to harsh environmental conditions are crucial for reliable performance.

AISI 4140 Flat Bar: Market Standard Dimensions

(Per ASTM A829 / GB/T 702 Standards)

Width (mm)	Thickness (mm)	Length (m)	Tolerance Standard	Typical Applications
20 - 50	5 - 20	3 - 6	ASTM A29 ±0.1mm	Hydraulic Valve Blocks, Machining Jig Plates
51 - 100	10 - 40	4 - 8	EN 10060 Class N	Mold Shoes, Heavy Bearing Seats
101 - 150	15 - 60	5 - 12	JIS G3193 ±0.15%	Press Guide Plates, Mining Wear Liners
151 - 200	20 - 80	6 - 18	DIN 1013 T2	Hydraulic Press Frames, Forging Anvil Base

GNEE Group 4140 Steel Flat Bar Factory Environment

GNEE Group Aisi 4140 Bar Packaging

GNEE Group 4140 Flat Bar Testing

Is 4140 alloy steel corrosion resistant?
Although 4140 steel contains chromium to improve corrosion resistance, it is not highly resistant to corrosion. Appropriate coatings or protective measures are recommended for use in corrosive environments.
What is the difference between 4140 and 4340 alloy steels?
4140 steel has a lower carbon content than 4340 steel, making it easier to machine. However, 4340 steel has higher strength and toughness, especially in larger sections, and is often used in heavy-duty applications.
Can 4140 alloy steel be welded?
Yes, 4140 steel can be welded using the proper welding techniques and precautions. However, post-weld heat treatment may be required to restore its properties, especially in the heat-affected zone.
What is the maximum hardness that 4140 steel can achieve through heat treatment?
Depending on the specific heat treatment process, 4140 steel can reach a hardness of up to approximately 58-60 HRC.
Is 4140 alloy steel round bar available in a variety of sizes and shapes?
Yes, 4140 Alloy Steel Round Bar is available in a variety of sizes and can also be made into a variety of shapes including square bars and flat bars to suit a variety of applications.

Hot Tags: aisi 4140 alloy steel flat bar, China aisi 4140 alloy steel flat bar suppliers, toughness alloy, precipitation hardening alloy, eco friendly alloy, nickel base, custom alloy, quality alloy