bent drag link

[stock 4runner]

dose any one run a drag link that is not straight from the start ( bent to miss something) if so how dose it hold up and whats it made out off

[Micka]

They do get made for custom applications.

RoverTracks in the U.S. make them as a high clearance alternative out of 4340 I think.

As long as its made out of strong enough material then there woud be no issues.

[stock 4runner]

i run 5 inch wheel spacers was going to make it out of 35mm solid 1030 as i dont think i could bent 4140 to start with

[nastytroll]

From memory, 1030 is basically mild steel. I would think it would bend easily when pushing against a rut/rock.

[stock 4runner]

yeah it just a little stronger but its got to be stronger then standard due to the size and i dont have enough clearance under the front as it hits about three things when its straight at different amounts of flex

[stock 4runner]

i could bend 4140 if i heat it but i know its tricky dose any one know the technical way of doing it as to not compromise it

[sambo]

Heat it up, bend it, then get it re-heat treated.

[stock 4runner]

thought that might be the case which is good cause i can do it all through work.
think that would be the strongest way unless any one knows of something stronger

[SuperiorEngineering]

It is a suspension part so read it.



4140 High Tensile Steel
4140 is a 1% chromium - molybdenum medium hardenability general purpose high tensile steel - generally supplied hardened and tempered in the tensile range of 850 - 1000 Mpa (condition T).
4140 is now available with improved machinability, which greatly increases feeds and/or speeds, while also extending tool life without adversley affecting mechanical properties.

Pre hardened and tempered 4140 can be further surface hardened by flame or induction hardening and by nitriding.

4140 is used extensively in most industry sectors for a wide range of applications such as:
Adapters, Arbors, Axle Shafts, Bolts, Crankshafts, Connection Rods, Chuck Bodies, Collets, Conveyor Pins & Rolls, Ejector Pins, Forks, Gears, Guide Rods, Hydraulic Shafts & Parts,Lathe Spindles, Logging Parts, Milling Spindles, Motor Shafts, Nuts, Pinch Bars, Pins Various, Pinions, Pump Shafts, Rams, Sockets, Spindles, Sprockets, Studs, Tool Holders, Torsion Bars, Worms etc..



Colour Code
Dark Blue
(Bar end)
Stocked Sizes Rounds 10mm to 690 mm Diameter
Hexagons 19 mm to 55 mm A/F
Hollow Bar 63 mm to 250 mm OD
Bar Finish Peeled, Cold Drawn
Turned and Polished,
Centreless Ground.
or Hot Rolled.
Related Specifications
Australia AS 1444-1996-4140
Germany DIN 17212 W.Nr 1.7223 Type 41CrMo4
DIN 17200-1654 W.Nr 1.7225 Type 42CrMo4
DIN 17200 W.Nr 1.7227 Type 42CrMoS4
Great Britain BS970-1955 EN19A
BS970 Part 3:1991 709M40
International ISO 683/II Type 3
ISO 683/IV Type 3a
ISO 683/IV Type 3b
Japan JIS G 4103 SNCM4
JIS G 4105 SCM4
JIS G 4105 SCM440
USA AISI 4140
ASTM A29/A29M-91 4140
ASTM A322 4140
ASTM A331 4140 (Cold Finish)
SAE 4140
Chemical Composition Min.% Max.%
Carbon 0.36 0.44
Silicon 0.10 0.40
Manganese 0.65 1.10
Chromium 0.75 1.20
Molybdenum 0.15 0.35
Phosphorous 0 0.04
Sulphur 0 0.04
Mechanical Property Requirements for Steels in the Heat-Treated Condition for Turned,
Peeled or Ground Finish to AS1444-1996 4140 and BS970 Part 3-1991 709M40
Mechanical
Property
Designation Limited
Ruling
Section
mm Tensile
Strength
Mpa 0.2%
Proof Stress
Mpa Elongation
on 5.65
% Izod
Impact
J Charpy
Impact
J Brinell
Hardness
HB
(Min) (Max) Min Min. Min. Min. Min Max
R 250 700 850 480 15 34 28 201 255
S 250 770 930 540 13 27 22 223 277
S 150 770 930 570 15 54 50 223 277

*T 100 850 1000 665 13 54 50 248 302
U 63 930 1080 740 12 47 42 269 331
V 30 1000 1150 835 12 47 42 293 352

W 20 1080 1230 925 12 40 35 311 375
*Material stocked generally in condition T
Check test certificate if critical for end use.


Mechanical Property Requirements for Steels Heat-Treated, and then Cold Finished to
AS 1444 - 1996, and BS 970 Part 3 - 1991 709 M40
Mechanical
Property
Designation Limited
Ruling
Section Tensile
Strength
Mpa 0.20%
Proof Stress
Mpa Elongation
on 5.65
% Brinell
Hardness
HB
Min Max Min Min Min Max
R 63 700 850 525 12 201 255
S 63 770 930 585 11 223 277
T 63 850 1000 680 9 248 302

U 63 930 1080 755 9 269 331
V 63 1000 1150 850 9 293 352
*Material stocked generally in condition T
Check test certificate if critical for end use.


Forging
Heat to 1150 oC - 1200 oC maximum, hold until temperature is uniform throughout the section.
Do not forge below 850 oC.
Following forging operation the work piece should be cooled as slowly as possible.



Heat Treatment
Annealing
Heat to 800 oC - 850 oC, hold until temperature is uniform throughout the section and cool in furnace.


Flame or Induction Hardening
4140 hardened and tempered bar can be further surface hardened by either the flame or induction hardening methods resulting in a case hardness in excess of Rc 50.
Parts should be heated as quickly as possible to the austenitic temperature range (840 C - 870 C) and "required case depth followed by an immediate oil or water quench, depending upon hardness required, workpiece" size/shape and quenching arrangements.

"Following quenching to hand warm, most components should be tempered between 150 C - 200 C to remove" quenching stresses in the case. This will have little effect on case hardness and will reduce the risk of grinding cracks.


Hardening
Heat to 840 oC - 875 oC, hold until temperature is uniform throughout the section, soak for 10 - 15 minutes per 25 mm section, and quench in oil, water, or polymer as required.
*Temper immediately while still hand warm.



Nitriding
4140 hardened and tempered bar can also be successfully nitrided, giving a surface hardness of up to Rc 60. Nitriding is carried out at 490 oC - 530 oC, followed by slow cooling (no quench) reducing the problem of distortion. Parts can therefore be machined to near final size, leaving a grinding allowance only. The tensile strength of the core is usually not affected since the nitriding temperature range is generally below the original tempering temperature employed.


Normalizing
Heat to 870 oC - 900 oC, hold until temperature is uniform throughout the section, soak for 10 - 15 minutes and cool in still air.


Stress Relieving
Heat to 680 oC - 700 oC, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm section, and cool in still air.
Tempering
Re-heat to 550 oC - 700 oC as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air.
Notes on Heat Treatment
Heating temperatures, rate of heating and soaking times will vary due to factors such as work piece size/shape also furnace type employed, quenching medium and work piece transfer facilities etc..
Please consult your heat treater for best results.

Machining
4140 in the hardened and tempered as supplied condition has good to very good machinability and operations such as sawing, turning, drilling, broaching, hobbing, milling and tapping can be carried out satisfactoraly using machine manufacturers recommendations for suitable tool type - feeds and speeds.
Welding
Welding of 4140 in the hardened and tempered condition (as normally supplied), is not recommended and should be avoided if at all possible, as the mechanical properties will be altered within the weld heat affected zone. It is preferred that welding be carried out on 4140 while in the annealed condition, and that the work piece, immediately on cooling to hand warm, is then stress relieved at 595 oC - 620 oC prior to hardening and tempering.
If welding in the hardened and tempered condition is really necessary, then the work piece, immediately on cooling to hand warm, should be if possible stress relieved at 15 oC below the original tempering temperature (if known).



Welding Procedure
Welding of 4140 in whatever condition should always be carried out using low hydrogen electrodes - please consult your welding consumables supplier.


Suggested pre-heat temperature
Section oC
25 mm 370
40 mm 400
50 mm 425
75 mm 455
150 mm + 510

Post Welding
Maximum cooling rate 95 oC per hour down to 95 oC, follow by cooling in still air. N.B. No draught. It is recommended that the work piece if possible is wrapped in an heat resistant blanket or buried in sand etc..


Interlloy believes the information provided is accurate and reliable. However no warranty of accuracy, completeness or reliability is given, nor will any responsibility be taken for errors or omissions.