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Home » News & Case » 4340 Steel | 36CrNiMo4 | 1.6511 | EN24 | SNCM439

4340 Steel | 36CrNiMo4 | 1.6511 | EN24 | SNCM439


4340 Steel | 36CrNiMo4 | 1.6511 | EN24 | SNCM439



AISI 4340 steel is a medium carbon, low alloy steel known for its toughness and strength in relatively large sections. AISI 4340 is also one kind of nickel chromium molybdenum steels. 4340 alloy steel is generally supplied hardened and tempered in the tensile range of 930 – 1080 Mpa. Pre hardened and tempered 4340 steels can be further surface hardened by flame or induction hardening and by nitriding. The 4340 steel has good shock and impact resistance as well as wear and abrasion resistance in the hardened condition. AISI 4340 steel properties offer good ductility in the annealed condition, allowing it to be bent or formed. Fusion and resistance welding is also possible with our 4340 alloy steel. ASTM 4340 material is often utilized where other alloy steels do not have the hardenability to give the strength required. For highly stressed parts it is excellent choice. AISI 4340 alloy steel can also be machined by all customary methods.

  1. Steel Grade: Alloy steel
  2. Standard: AISI, ASTM, BS, DIN, GB, JIS
  3. Dimensions: Dia Max:800mm
  4. Place of Origin: Guangdong, China (Mainland)
  5. Brand Name: SongShun
  6. Model Number: En24 34CrNiMo6 1.6582 4340
  7. Technique: Hot Rolled
  8. Application: Die Steel Bar
  9. Alloy Or Not: Is Alloy
  10. Special Use: Mold Steel
  11. Type: Alloy Steel Bar
  12. Mould name: Hot rolled En24 steel aisi 4340 alloy steel round bars 34CrNiMo6
  13. Shape: Round bars/Flat bar/Plate
  14. Technology: Hot Rolled/Forged/Clod Drawn
  15. Heat treatment: Annealing/Q+T
  16. Surface treatment:Black/Peeling/Polishing/Machined
  17. Delivery condition: Hot rolled or forged/ Peeled or black surface/annealed or QT
  18. Test: SGS/UT100%/Elements testing
  19. Certificate: ISO/Mill certificate
  20. Service: Sample free and 24 hours online
  21. Experience: 10 years of manufacture experience

Packaging & Delivery

Packaging Details: seaworthy packing; 20ft: GW:17.5T; (5.80mX2.13mX2.18m,) 40ft: GW:22T; (11.8mX2.13mX2.18m,)
Delivery Detail: 4~7days after the order is confirmed


1.6582 steel 34CrNiMo6 steel round bars aisi 4340 steel
2.Sample free
3.Black or Bright
4.Dia Max:800mm

Product Description 

Hot rolled 1.6582 steel 34CrNiMo6 steel round bars aisi 4340 steel
 1. Specification of aisi 4340 steel
            Round bar     Diameter(mm)     Length (mm)  
    20~800     3000~5800  
           Plate     Thickness(mm)     Width (mm)     Length (mm)
    Max:800     205~800   2000~4000
                                                         The specification can be customized.
 2. Chemical compositon(%) of aisi 4340 steel
          Number C Si Mn Cr   Mo P S Ni
GB 40CrNiMoA 0.37~0.44 0.17~0.37 0.50~0.80 0.6~0.9 0.15~0.25 ≤0.035 ≤0.035 1.25~1.65
AISI 4340 0.38~0.43 0.15~0.35 0.60~0.80 0.7~0.9 0.20~0.30 ≤0.035 ≤0.040 1.65~2.00
  EN (DIN) 1.6562 0.37~0.44 0.15~0.40 0.50~0.80 0.6~0.9 0.20~0.30 ≤0.035 ≤0.040 160~1.90
3. Characteristic of aisi 4340 steel        
1.6562 is another alloy which displays superior mechanical properties. This material is
available in the Annealed or Quenched and Tempered conditions. 4340 is used many
industries including oil and gas exploration, gear manufactring etc.
4.Mechanical properties of aisi 4340 steel
Tensile str. (N/mm2) Yield point






Impack work




 980 835 12 205 55 269
6. Main application of aisi 4340 steel:  
(1) Generally used for producing the important parts with high strength and good plastic.  
(2) After nitrogen treatment, used for producing the important parts with special performance  
requirements, such as shafts, gears, fasteners, bolt of large dia steamer etc.  


Annual output :300000Tons


Cutting service provided
Workshop is equipped with the most advanced CNC grinding machine, CNC milling machine,
Vertical and Horizontal band saw cutting machine, Max. 30MT Loading Cranes, ultrasonic Test machines…
These equipments are manipulated with professional engineers with many years work experiences.


50000T steels in stock