AISI/SAE 4340 Alloy Steel Bar
AISI 4340 carbon steel bar is made of a heat treatable low alloy steel containing chromium, nickel and molybdenum. It has high toughness and high strength under heat treatment conditions.
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- Commodity name: AISI/SAE 4340 Alloy Steel Bar
AISI 4340 carbon steel bar is made of a heat treatable low alloy steel containing chromium, nickel and molybdenum. It has high toughness and high strength under heat treatment conditions.
AISI/SAE 4340 Alloy Steel Bar Description
AISI 4340 is a commonly used alloy steel with high strength, high toughness, good wear resistance and corrosion resistance. Its moderate carbon content gives it good machinability and weldability. In addition, it also contains appropriate amounts of chromium, nickel and other elements, which further improves its performance. At the same time, its toughness and ductility are also quite good, and it can maintain good performance even in both high or low temperature environments. Due to the excellent physical and mechanical properties of 4340 steel, 4340 steel bars are also widely used in equipment manufacturing in corrosive environments such as petroleum, chemical industry, and ships.
Product ParametersProduct Name
AISI/SAE 4340 Alloy Steel Bar Standard
EN/DIN/JIS/ASTM/BS/ASME/AISI, etc.
Common Round Bar Specifications
3.0-50.8 mm, Over 50.8-300mm
Flat Steel Common Specifications
6.35x12.7mm, 6.35x25.4mm, 12.7x25.4mm
Hexagon Bar Common Specifications
AF5.8mm-17mm
Square Bar Common Specifications
AF2mm-14mm, AF6.35mm, 9.5mm, 12.7mm, 15.98mm, 19.0mm, 25.4mm
Length
1-6meters, Size Accept Custom
Diameter(mm)
Hot Rolling Round Bar
25-600
Cold Rolling Square Bar
6-50.8
Hot Rolling Square Bar
21-54
Cold Rolling Hexagon Bar
9.5-65
Cold Rolling Round bar
6-101.6
Forged Rebar
200-1000
Surface Process
Bright, Polished, Black
Other Services
Machining(cnc), Centerless Grinding(cg), Heat Treatment, Annealing, Pickling, Polishing, Rolling, Forging, Cutting, Bending, Small Machining, etc.
Chemical Composition
Grade
Mn
S
C
P
Si
Cr
Ni
AISI 4340
0.60-0.80
0.035
0.38-0.43
0.04
0.15-0.35
0.70-0.90
1.65-2.00
Mechanical Properties
Grade
Tensile Strength kg f/mm2
Yield Strength kg f/mm2
Elongation %
Hardness HB
AISI 4340
≥ 100
≥ 90
≥ 16
293-352
Scope of Application
AISI 4340 alloy steel is mainly used for power transmission gears and shafts, aircraft landing gear and other structural parts.
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AISI/SAE 4340 Alloy Steel Bar - Stock Warehouse
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AISI/SAE 4340 Alloy Steel Bar - Product Inspection
Tensile Strength Testing Tensile Strength Testing Physical Performance Testing Chemical Composition Testing 
Inspection Hardness Testing Spectral Detection Mechanical Properties -
AISI/SAE 4340 Alloy Steel Bar - Product Measurement
Measurement Measurement Measurement Measurement -
AISI/SAE 4340 Alloy Steel Bar - Product Packaging
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