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hort description:
AISI 4340 steel is a medium carbon, low alloy steel known for its strength andstrength in relatively large areas. AISI 4340 is also one kind ofnickel chromium molybdenum steel. Alloy steel 4340 is generallysupplied quenched and tempered in the tensile range of 930 - 1080 Mpa.Pre quenched and tempered 4340 steel can be further flame hardened or induction hardened and nitrided. Steel 4340 has goodshock and impact resistance as well as wear and abrasion resistance ...


Length: 3-5.8mm or customization
Surface: black, peeled, or rough chiseled
Heat treatment: air cooling, normalized, annealed, Q&T
Melting process: EAF + LF + V.D.

AISI steel 4340

is a medium carbon, low alloy steel known for its strength and
strength in relatively large areas. AISI 4340 also one kind
nickel chromium molybdenum steels. Alloy 4340 steel is generally
supplied by quenching and tempering in the range of stretching 930 - 1080 MPa.
Pre-hardened and tempered 4340 steels can be additionally surface hardened

flame or induction hardening and nitriding. Became 4340 has a good
shock and impact resistance as well as wear and abrasion resistance in
hardened state. AISI 4340 steel properties provide good ductility
in an annealed condition, allowing it to be bent or molded. Fusion and
Resistance welding is also possible with our 4340 alloy steel. ASTM 4340

material is often used where other alloy steels do not have
hardenability to give the strength needed. For heavily loaded parts
It's a great choice. AISI 4340 steel can also be processed with
all the usual methods.



ASTM 4340 steel grades are often replaced
with European standards based on 817M40 / EN24 and 1.6511 / 36CrNiMo4 or Japan on
based on SNCM439 steel. You have the details of 4340 below.
4. Counterfeit 4340 alloy steel

Preheating

4340 steel is first heated to 1150 C - no more than 1200 C for forging,
hold until temperature is uniform throughout the section.

Do not fake

below 850 C. 4340 have good characteristics, but forging must be observed
Caution when cooling as steel shows a tendency to crack.
After the forging operation, the workpiece must be cooled as slowly as possible.

possibly. And cooling in sand or dry lime is recommended etc.

5. Treatment AISI 4340 Steel grade Thermal

stress relief

To receive

pre-hardened steel stress relief is achieved by heating 4340 steel
in the range from 500 to 550 .Heated to 600 - 650 , hold up to temperature

not uniform over the entire section, soak for 1 hour in a 25 mm section,
and cool in still air.

annealing

A

Full Annealing can be done at 844 C (1550 F) followed by an adjustable
(ovens) cooling at a rate no faster than 10 C (50 F) per hour until

315 C (600 F). From 315 C 600 F can be air cooled.

   AISI 8620 1,6523 | 21NiCrMo2 | SNCM220          20NiCrMo13-4 1.6660     ASTM 52100 | 1,3505 | 100Cr6 | SUJ2 | EN31       33NiCrMoV14-5 1.6956     

   AISI 4340 | 36CrNiMo4 | 1,6511 | EN24 | 817M40 | SNCM439      EN DIN 34CrNiMo6 | 1,6582 | 4337 Engineering Steel    BS EN 42CrMo4 | 1,7225 Alloy Steel  

   1,2379 | X153CrMo12 | SKD11      UNS S31254 1.4547 F44 Super Austenitic Stainless Steel      DIN 1.6657 14NiCrMo13-4 16NCD13 832M13 EN36C

   DIN1.6587 X4317 18CrNiMo7-6 17CrNiMo6 18NCD       DIN 1.6566 17NiCrMo6-4 18NiCrMo5 817M17 SAE4317       DIN 1.6657 14NiCrMo13-4 16NCD13 832M13 EN36C