SAE 41xx.html fatigue index file

SAE 41xx Steel fatigue file index :

Last update: Mar.16-2009, May,Jun09, May,Dec2018, Jan2019

The files in this directory are offered by the F.D.E. committee and AISI Bar Committee members as a set of example files for the construction of web based material fatigue property databases. They are meant for information and research use only, not for design.

SAE 41B17M or PS19:

SAE 41B17M BHN=277 __ | __ Fitted __ | __ Calculator   HRc=28.5 (AISI Bar Iter 072)
   Simul. Carburized(Atmosphere) Core, Quenched+Temper 100% Martensite
  Tensile   Tensile+Cyclic   Met.Rep.(doc)   FatigueReport
SAE 41B17M 286_BHN __ | __ Fitted __ | __ Calculator   HRc=30 (AISI Bar Iter 078)
   Simul. Carburized(Vacuum 1800F) Core, Quenched+Temper 100% Martensite
  Tensile   Tensile+Cyclic   Met.Rep.(doc)   FatigueReport
Compare above iter 72, 78 Strain vs 2Nf Plot
SAE 41B17M 665_BHN __| _ Fitted __| _ Calculator (Note: Fitted to lower bound)   HRc=61 (AISI Bar Iter 073)
   Simul. Carburized(Atmosphere) Case, Quenched+Temper 100% Martensite
  Tensile   CyclicNotReported   Met.Rep.(doc)    Fitted-vs-Raw   FatigueReport
SAE 41B17M 627_BHN __| _ Fitted __| _ Calculator (Note: Fitted to lower bound)   HRc=59 (AISI Bar Iter079)
   Simul. Carburized(Vacuum 1800F) Case, Quenched+Temper 100% Martensite
  Tensile   Tensile+Cyclic    Fitted-vs-Raw   Met.Rep.(doc)   FatigueReport
Compare above iter 73, 79 Strain vs 2Nf Plot

SAE 4120(Modified) Higher Temperature Carburization:

1700 F Carburized SAE 4120(Modified):
- SAE 4120(Mod)1700F-Carb Simulated Core Const.Ampl Axial, HRc=38.7 Iter.206 Report
  Tensile Tensile+Cyclic
- SAE 4120(Mod)1700F-Carb Simulated Core Const.Ampl. 4Pt.Bending, HRc=42.6 Iter.207 Report
- SAE 4120(Mod)1700F-Carb Simulated Case Const.Ampl Axial Iter.210 Report (not available yet)
- SAE 4120(Mod 1700F-Carb Case+Core Composite Const.Ampl 4Pt.Bending, HRc=57.6 Iter.211 Report
  ( Heat treat furnace problem. Specim. were re-heated and quenched.)
1900 F Carburized SAE 4120(Modified):
- SAE 4120(Mod)1900F-Carb Simulated Core Const.Ampl Axial, HRc=34.7 Iter.198 Report
  Tensile+Cyclic Initial Tensile+Cyclic
- SAE 4120(Mod)1900F-Carb Simulated Core Const.Ampl. 4Pt.Bending, HRc=41.7 Iter.199 Report
- SAE 4120(Mod)1900F-Carb Simulated Case Const.Ampl Axial Iter.202 Report (not available yet)
- SAE 4120(Mod)1900F-Carb Case+Core Composite Const.Ampl 4Pt.Bending Iter.203 Report (not available yet)

SAE 4130:

SAE 4130AL 442_BHN __ | __ Fitted __ | __ Calculator Const.Ampl Axial, HRc=46 (AISI It. 29)
Tensile Initial Tensile+Cyclic Micro100X Micro500X FatigueReport
SAE 4130 259_BHN (NASA) __ | __ Fitted __ | __ Calculator
SAE 4130 366_BHN (NASA) __ | __ Fitted __ | __ Calculator

SAE 4140:

SAE 4140 325_BHN __ | __ Fitted __ | __ Calculator HRc=31.1 (AISI Bar Iter 30)
(.021% S) Cont.Cast, Quenched+Tempered, 100% Martensite.
Tensile Cyclic Micro-100x Micro-100x FatigueReport
SAE 4140 381_BHN __ | __ Fitted __ | __ Calculator HRc=41 (AISI Bar Iter 64)
(.021% S) Rotary Cast, Quenched+Tempered, 100% Martensite.
Tensile Cyclic Met.Rep.(doc) FatigueReport
SAE 4140 375_BHN HRc=40 (AISI Bar Iter 65)
(.021% S) Rotary Cast, Quenched+Tempered, 100% Martensite.
Tensile Cyclic Met.Rep.(doc) FatigueReport
SAE 4140 390_BHN __ | __ Fitted __ | __ Calculator HRc=42 (AISI Bar Iter 66)
(.021% S) Rotary Cast, Quenched+Tempered, 100% Martensite.
Tensile Cyclic Met.Rep.(doc) FatigueReport
SAE 4140 353_BHN __ | __ Fitted __ | __ Calculator HRc=38 (AISI Bar Iter 68)
(.009% S) Ingot Cast, Quenched+Tempered, 100% Martensite.
Tensile Tensile+Cyclic Met.Rep.(doc) FatigueReport
SAE 4140 353_BHN __ | __ Fitted __ | __ Calculator HRc=38 (AISI Bar Iter 93)
( .009% S) Ingot Cast, Induction Thru hardened, 70% Bainite, 30% ferrite
Tensile Tensile+Cyclic Met.Rep.(doc) FatigueReport
SAE 4140 371_BHN __ | __ Fitted __ | __ Calculator HRc=40 (AISI Bar Iter 69)
(.009% S) Ingot Cast, Quenched+Tempered, 100% Martensite.
Tensile Tensile+Cyclic Met.Rep.(doc) FatigueReport
SAE 4140 381_BHN __ | __ Fitted __ | __ Calculator HRc=41 (AISI Bar Iter 67)
(.009% S) Ingot Cast, Quenched+Tempered, 100% Martensite.
Tensile Tensile+Cyclic Met.Rep.(doc) FatigueReport
Merged SAE 4140 350-394 (AISI Bar Iter 68 93 69 64 67 87 66 89 ) __ | __ Fitted __ | __ Calculator __ | __ LowBound Fitted __ | __ LowBound Calculator
Merged SAE 4140 350-395 (AISI Bar Iter 68 93 69 64 67 87 66 89 81 )
Note that file 81 does not fit trend.

Sort 4140 below by Sulfur and Hardness
SAE 4140 385_BHN __ | __ Fitted __ | __ Calculator (AISI Bar Iter 97)
  (High Sulfur 0.077%) Mill Induction Hardened 1.12in bar, HRc=41.5
  Tensile   Tensile+Cyclic   FatigueReport
  Micro-T-100X   Micro-L-100X   Micro-T-etch   Micro-L-etch
SAE 4140 388 BHN __ | __ Fitted __ | __ Calculator (AISI Bar Iter 96)
  (Low Sulpur 0.015) Mill induction hardened. 1.12in bar, HRc=41.7
  Tensile   Tensile+Cyclic   FatigueReport
  Micro-T-100X   Micro-L-100X   Micro-T-etch   Micro-L-etch
SAE 4140 395 BHN __ | __ Fitted __ | __ Calculator (AISI Bar Iter 81)
SAE 4140 395 BHN POL (AISI Bar Iter. 118+ 81)
(High Sulfur 0.077%) Billet Forged to Test Block, Normalized Q.and T., Transv. Tested HRc=42.5
Tensile Tensile+Cyclic Met.Rep.it.116,117,118(doc) FatigueReport-it.81 FatigueReport-it.118
SAE 4140 394_BHN __ | __ Fitted __ | __ Calculator (AISI Bar Iter 80)
SAE 4140 394_BHN POL (AISI Bar Iter. 117+ 80)
(Low Sulfur 0.012%) Billet Forged to Test Block, Normalized Q.and T., Transv. Tested HRc=42.5
Tensile Tensile+Cyclic Met.Rep.it.116,117,118(doc) FatigueReport-it.80 FatigueReport-it.117
SAE 4140 477 BHN __ | __ Fitted __ | __ Calculator (AISI Bar Iter 77)
(High Sulpur 0.077%) Billet forged to test block, Transverse tested HRc=51 near surface, HRc=49 at center.
Tensile Tensile+Cyclic Met.Rep.(doc) FatigueReport
SAE 4140 477 BHN __ | __ Fitted __ | __ Calculator (AISI Bar Iter 76)
(Low Sulpur 0.012%) Billet forged to test block, Transverse tested HRc=51 near surface, HRc=49.5 at center.
Tensile Tensile+Cyclic Met.Rep.(doc) FatigueReport
SAE 4140 477_BHN __ | __ Fitted __ | __ Calculator (AISI Bar Iter 98)
(Ultra Low Sulpur 0.004%) Billet forged to test block, HRc=49.0
Normalized, Quenched and Tempered, Transverse Tested
Tensile Tensile+Cyclic Met.Rep.(doc) FatigueReport
SAE 4140 375_BHN (AISI Bar Iter 99)
(Ultra Low Sulpur 0.004%) Billet forged to test block, HRc=40.5
Normalized, Quenched and Tempered, Transverse Tested Met.Rep.(doc)
SAE 4140 375_BHN POL (AISI Bar Iter 116)
PartialTensile Tensile+Cyclic Met.Rep.it.116,117,118(doc) FatigueReport-it.99 FatigueReport-it.116
For %Sulfur comparison plots see : Project Index: Results Prj.15+17

SAE 4142:

SAE 4142 380_BHN (Landgraf) __ | __ Fitted __ | __ Calculator
SAE 4142 400_BHN (Landgraf) __ | __ Fitted __ | __ Calculator
SAE 4142 450_BHN (Landgraf) __ | __ Fitted __ | __ Calculator
SAE 4142 450_BHN Heat Treat + Deformed (Landgraf) __ | __ Fitted __ | __ Calculator
SAE 4142 475_BHN (Landgraf) __ | __ Fitted __ | __ Calculator
SAE 4142 560_BHN (Landgraf) __ | __ Fitted __ | __ Calculator (Note: No long life data. Use a merged file instead.)

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