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AISI 4130 Alloy Steel Bar/Rod

Product Code : AL-AI4130-NN-BR

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.Alloy steel AISI 4130 contains chromium and molybdenum as strengthening agents. This alloy contains high amounts of chromium and is often referred to as chromoly, it is a high chromium contrition steel grade that has much common concentration including valve bodies, pumps. 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.


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AISI 4130 Alloy Steel Bar/Rod AL-AI4130-NN-BR Customized Customized

Product Information

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.Alloy steel AISI 4130 contains chromium and molybdenum as strengthening agents. This alloy contains high amounts of chromium and is often referred to as chromoly, it is a high chromium contrition steel grade that has much common concentration including valve bodies, pumps. 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.


AISI 4130 Alloy Steel Bar/Rod Specification

Size:customized

Purity: customized

Per your request or drawing

We can customized as required

CountryUSABSBSJapan
StandardASTM A29EN   10250/EN10083BS 970JIS G4105
Grades413025CrMo4/1.7218708A25/708M25SCM430

Properties(Theoretical)

PropertiesMetric
Tensile   strength, ultimate560 MPa
Tensile   strength, yield460 MPa
Modulus of   elasticity190-210 GPa
Bulk modulus   (Typical for steel)140 GPa
Shear modulus   (Typical for steel)80 GPa
Poissons ratio0.27-0.30
Elongation at   break (in 50 mm)21.50%
Reduction of   area59.6
Hardness,   Brinell217
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
Density (lb /   cu. in.)         0.283
Specific   Gravity                7.8
Specific Heat   (Btu/lb/Deg F – [32-212 Deg F])         0.114
Melting Point   (Deg F)         2610
Thermal   Conductivity  22.3
Mean Coeff   Thermal Expansion     7
Modulus of   Elasticity Tension    29
Thermal conductivity (100°C)
42.7 W/mK


Chemical Composition

StandardGradeCMnPSSiCrMo
ASTM A2941300.28-0.330.40-0.600.0350.0400.15-0.350.80-1.100.15-0.25
EN10250
  /EN10083
25CrMo4/
  1.7218
0.22-0.290.60-0.900.0250.035≦0.400.90-1.20.15-0.30
JIS G4105SCM430/
  SCM2
0.28-0.330.60-0.850.0300.0300.15-0.350.90-1.20.15-0.30


AISI 4130 Steel Grade Heat Treatment

Annealing of 4130 steels

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.

Normalizing of Alloy Steel 4130

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.

Hardening of AISI 4130 Alloy Steel

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.

Tempering of 4130 Steel

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.


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:

Commercial aircraft, aircraft engine mounts

Military aircraft

Automotive

Machine tools

Hydraulic tools

Auto racing

Aerospace

Oil and gas industries – as forged valve bodies      and pumps

Agricultural and defense industries etc.


Packing of AISI 4130 Alloy Steel Bar/Rod

Standard Packing:

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes Special package is available on request.

ATTs’ AISI 4130 Alloy Steel Bar/Rod is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.


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