Editorial Feature

AISI 4130 Alloy Steel (UNS G41300)

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Alloy steels are designated by AISI four-digit numbers. They are more responsive to mechanical and heat treatments than carbon steels. They comprise different types of steels with compositions which exceed the limitations of B, C, Mn, Mo, Ni, Si, Cr, and Va in the carbon steels.

AISI 4130 alloy steel contains chromium and molybdenum as strengthening agents. It has low carbon content, and can be welded easily. The datasheet below provides further detail.

Chemical Composition

The chemical composition of AISI 4130 alloy steel is listed in the following table.

Element Content (%)
Iron, Fe 97.03 98.22
Chromium, Cr 0.80 1.10
Manganese, Mn 0.40 0.60
Carbon, C 0.280 0.330
Silicon, Si 0.15 0.30
Molybdenum, Mo 0.15 0.25
Sulfur, S 0.040
Phosphorous, P 0.035

Physical Properties

Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in³
Melting point 1432°C 2610°F

Mechanical Properties

Properties Metric Imperial
Tensile strength, ultimate 560 MPa 81200 psi
Tensile strength, yield 460 MPa 66700 psi
Modulus of elasticity 190-210 GPa 27557-30458 ksi
Bulk modulus (Typical for steel) 140 GPa 20300 ksi
Shear modulus (Typical for steel) 80 GPa 11600 ksi
Poissons ratio 0.27-0.30 0.27-0.30
Elongation at break (in 50 mm) 21.50% 21.50%
Reduction of area 59.6 59.60%
Hardness, Brinell 217 217
Hardness, Knoop (Converted from Brinell hardness) 240 240
Hardness, Rockwell B (Converted from Brinell hardness) 95 95
Hardness, Rockwell C (Converted from Brinell hardness, value below normal HRC range, for comparison purposes only.) 17 17
Hardness, Vickers (Converted from Brinell hardness) 228 228
Machinability (Annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.) 70 70

Thermal Properties

Properties Metric Imperial
Thermal conductivity (100°C) 42.7 W/mK 296 BTU in/hr.ft2. °F

Other Designations

Other designations that are equivalent to AISI 4130 alloy steel include the following;

AMS 6348 AMS 6371 ASTM A331 ASTM A829 DIN 1.7218
AMS 6350 AMS 6373 ASTM A506 MIL S-18729 UNI 25 CrMo 4
AMS 6351 AMS 6374 ASTM A507 MIL S-6758 JIS SCCrM 1
AMS 6360 AMS 6528 ASTM A513 SAE J1397 JIS SCM 2
AMS 6361 AMS 7496 ASTM A519 SAE J404 SS 2225
AMS 6362 ASTM A29 ASTM A646 SAE J412 B.S. CDS 110
AMS 6370 ASTM A322 ASTM A752 AFNOR 25 CD 4 (S) SAE J770

Fabrication and Heat Treatment

Machinability - AISI 4130 steel can be easily machined using conventional methods. However, machining becomes difficult when the hardness of the steel is increased.

Forming of AISI 4130 steel can be performed in the annealed condition.

  • Welding of AISI 4130 steel can be performed by all commercial methods.
  • Heat Treatment - AISI 4130 steel is heated at 871°C (1600°F) and then quenched in oil. This steel is usually heat-treated at temperatures ranging from 899 to 927°C (1650 to 1700°F).
  • Forging of AISI 4130 steel can be performed at 954 to 1204°C (1750 to 2200°F).
  • Hot working of AISI 4130 steel can be done at 816 to 1093°C (1500 to 2000°F).
  • AISI 4130 steel can be cold worked using conventional methods.
  • AISI 4130 steel can be annealed at 843°C (1550°F) followed by air cooling at 482°C (900°F).
  • Tempering of AISI 4130 steel can be performed at 399 to 566°C (750 to 1050°F), depending on the desired strength level.
  • Hardening of AISI 4130 steel can be done with cold working or heat treatment.

Some of the major applications of AISI 4130 alloy steel are in aircraft engine mounts and welded tubing.

This article was updated on 31st July, 2019

Comments

  1. Gaurav Godha Gaurav Godha India says:

    what is the wt of aisi 4130 per meter?

    • Adam Clark Adam Clark Canada says:

      Weight doesn't work per meter. Its based on volume. Also, it tells you at the very top. Please at least think before asking a question

      • ALPESH JAIN ALPESH JAIN India says:

        WE NEED  STEEL PLATE SPEC:MIL - S-18729C
        AISI-4130.
        SIZE :6.35 +0.77/-0.26 mm X 914mm X1828 (6'X3'X6.35mm)
        Awaiting for your valued enquiry.
        Very Truly Yours
        Best regards,
        RAJ ENTERPRISES.
        ALPESH JAIN.
        REGD OFFICE:
        M/s.RAJ ENTERPRISES.
        58-A , 1ST KHATTAR GALLI,
        THAKURDWAR.
        MUMBAI:-400002.
        PHONE:-022-23876049 , 66362252.
        MOBILE:-9819413349.
        E-MAIL:- [email protected], [email protected]    , [email protected] .  
        WEB:-  www.rajentindia.com / www.rajentindia.co.in

  2. mp engineering mp engineering India says:

    what is mean by AISI G41300 , this is SS,MS ,Nickel based

  3. Abigail manriquez Abigail manriquez United States says:

    What was the cost of 4130 alloy steel over the past 12 months?

    • Adam Clark Adam Clark Canada says:

      A materials specification website probably doesn't carry that information. The search engine you used to find this page would probably suit you better and not waste other peoples time.

  4. David Willis David Willis United Kingdom says:

    any fracture toughness and fatigue data available on this material?

  5. ALPESH JAIN ALPESH JAIN India says:

    WE NEED  STEEL PLATE SPEC:MIL - S-18729C
    AISI-4130.
    SIZE :6.35 +0.77/-0.26 mm X 914mm X1828 (6'X3'X6.35mm)
    Awaiting for your valued enquiry.
    Very Truly Yours
    Best regards,
    RAJ ENTERPRISES.
    ALPESH JAIN.
    REGD OFFICE:
    M/s.RAJ ENTERPRISES.
    58-A , 1ST KHATTAR GALLI,
    THAKURDWAR.
    MUMBAI:-400002.
    PHONE:-022-23876049 , 66362252.
    MOBILE:-9819413349.
    E-MAIL:- [email protected], [email protected]    , [email protected] .  
    WEB:-  www.rajentindia.com / www.rajentindia.co.in

  6. akash khamkar akash khamkar India says:

    Is the given value of sut and syt of 4130 is trusted ? Any reference ?

  7. akash khamkar akash khamkar India says:

    Is the given value of sut and syt is trusted? any reference

  8. Ryan DelaCourt Ryan DelaCourt United States says:

    Is there data available for Johnsons cook strength in regards to the plasticity?

  9. Yugank Pandit Yugank Pandit India says:

    Can you let me know the fatigue strength and fatigue coefficients of AISI 4130 normalised steel

  10. SANJEET CHOUBEY SANJEET CHOUBEY India says:

    I need ladle analysis tolerance for UNS G41300.
    please advise which ASTM are follow up for ladle analysis.

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoM.com.

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