|Product Name:||Solid Bar AISI4130||Material:||Alloy Steel|
|OD:||4" To 15"||Length:||15FT|
15ft Special Alloy Steel,
AISI 4130 Special Alloy Steel,
15" special steel and alloys
Special Alloy Steel Solid Bar AISI4130 OD 1 4" To 15"
AISI 4130 alloy steel is a medium carbon, low alloy steel in ASTM A29 standard. ASTM 4140 steel is also commonly referred to as a chromoly
steel, or chrome moly steel, containing nominally 0.28-0.33% Carbon, 0.8-1.1% Chromium and 0.15-0.25% Molybdenum. It is similar to 4140
steel which has a higher carbon level (0.28-0.33%), giving 4130 material improved weldability, at the expense of through thickness strength. With
the proper heat treatment it is also readily machined. Annealing ASTM 4130 alloy steel offers excellent ductility. AISI 4130 steel is usually
supplied as round bar commonly in the hardened and tempered condition.
AISI 4130 Steel Specification and Relevant Standards
|Standard||ASTM A29||EN 10250/EN10083||BS 970||JIS G4105|
ASTM 4130 Steels And Equilvalents Chemical Composition
AISI/SAE 4130 steel grade is a versatile alloy with good atmospheric corrosion resistance and reasonable strength up to around 315º C (600º F).
It shows good overall combinations of strength, toughness and fatigue strength.
1.AISI Alloy 4130 Steel Supply Range
4130 Steel Round Bar: diameter 8mm – 3000mm
4130 Steel Plate/Flat Bar: thickness 10mm – 1500mm x width 200mm – 3000mm
4130 Steel Tube: outer diameter 4mm to 800mm
Surface Finish: Black, Rough Machined, Peeled, Turned or as per given requirements.
MOQ: 10 tons per size for new production.
AISI Alloy 4130 Steel Mechanical Properties
Steel 4130 Physical Properties
AISI 4130 Steel Mechanical Properties
|Tensile strength, ultimate||560 MPa|
|Tensile strength, yield||460 MPa|
|Modulus of elasticity||190-210 GPa|
|Bulk modulus (Typical for steel)||140 GPa|
|Shear modulus (Typical for steel)||80 GPa|
|Elongation at break (in 50 mm)||21.50%|
|Reduction of area||59.6|
|Hardness, Knoop (Converted from Brinell hardness)||240|
|Hardness, Rockwell B (Converted from Brinell hardness)||95|
|Hardness, Rockwell C (Converted from Brinell hardness, value below normal HRC range, for comparison purposes only.)||17|
|Hardness, Vickers (Converted from Brinell hardness)||228|
|Machinability (Annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.)||70|
|Thermal conductivity (100°C)||42.7 W/mK|
Forging of 4130 Alloy Steel
ASTM A29 Grade 4130 steel should be forged between 1230 and 950 º C (2250 and 1750 º F). The lower the finishing temperature from forging,
the finer will be the grain size. If the 4130 alloy steel is forged at too low a temperature, there is a risk of the formation of a non-uniform structure
in certain areas of the forged part, necessitating a normalizing treatment, prior to further heat treatment.
AISI 4130 Steel Grade Heat Treatment
Annealing of 4130 steel forgings may be carried out by transferring the part straight from the forging operation to a furnace held at a suitable
temperature, around 860º C (1575 º F) for annealing, holding for a suitable time then furnace cooling. In this way a structure suitable for
machining may be obtained. This treatment is best used for parts with simple shapes. If the 4130 forging is such that some sections will finish
much colder than others then a uniform structure will not be obtained and for best results a spheroidizing anneal at around 750 º C (1380 º F) may
be used. It is safe to say that experience alone will decide the best type of annealing treatment to be used prior to machining.
It should then be cooled in the furnace at a rate of less than 50 F per hour down to 900 F, followed by air cooling from 900 F.
The nominal normalizing temperature for 4130 is 900 º C (1650 º F) followed by the 1600 F soak and oil quench, but production experience may
necessitate a temperature either 50 º F (10 º C) above or below this figure. In fact when forgings are normalized before, for example, carburizing
or hardening and tempering, the upper range of normalizing temperatures is used. When normalizing is the final heat treatment, the lower
temperature range is used.
The steel 4130 should be austenitized – i.e. all micro constituents transformed to austenite – at 1500 to 1600 º F (815 to 870 º C). The actual
austenitizing temperature is a function of chemical composition within the analysis range, section size and cooling method. Smaller sections of
4130 might be quenched in oil, heavier sections in water.
The actual tempering temperature will depend on what required properties are needed. Alloy steel 4130 is tempered at between 398 ºC -565 ºC
(750 F and 1050 F), depending upon the strength level desired. The lower the tempering temperature the greater the strength. However,
tempering should not be carried out between 200 – 420 ºC (400 – 790 º F) to avoid the danger of embrittlement.
The AISI 4130 alloy is readily machinable by conventional methods. Simple shapes might be machined following a normalizing treatment,
whereas more complex shapes will require annealing. However, machining becomes difficult when the hardness of the 4130 steel is increased.
AISI 4130 steel is also good in weldability, and the 4130 alloy may be welded by any commercial method. The material may require a post-weld
stress relief heat treatment in certain instances.
Low-hydrogen electrodes are recommended together with preheat at 150 – 260 º C (300 – 500 º F) to be maintained during welding, Cool slowly
and stress relieve where possible.
Application of 4130 Steel
AISI 4130 steel alloy is used primarily in the construction of commercial and military aircraft and ground support systems.
Alloy steel 4130 is an intermediate strength material. Lighter gauges offer lighter weight but still maintain great strength, making it excellent for
auto racing and aerospace.
This low alloy 4130 steel is widely used in many applications, and some typical application areas are as follows:
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