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Quick Details

  • Steel Grade: AISI 4340
  • Standard: AISI, ASTM, BS, DIN, GB, JIS
  • Dimensions: Dia: 10~350mm
  • Place of Origin: Shanghai, China (Mainland)
  • Brand Name: Unite Steel
  • Model Number: Round bar
  • Technique: Hot Rolled
  • Application: Structural Steel Bar
  • Alloy Or Not: Is Alloy
  • Special Use: Free Cutting Steel
  • Type: Alloy Steel Bar
  • Hardening: 850℃ oil
  • Tempering: 600℃ oil or water
  • Ultrasonic test: According to SEP 1921-84 3C/c
  • Delivery condition: Annealed/hot rolled/cold drawn/quenched & tempered
  • Surface treatment: Machined/peeled/polished/turned
  • Certificate: ISO 9001:2008/SGS/BV
  • Process: EF+LF+VD+ESR+EAF

Packaging & Delivery

Packaging Details Seaworthy Package or as your request
Delivery Time Within 15-45 days

 

AISI 4340/DIN 1.6511/GB 40CrNiMo

Product Description

 

 

1.Chemical composition :

Carbon

0.38 - 0.43

Chromium

0.7 - 0.9

Iron

Balance

Manganese

0.6 - 0.8

Molybdenum

0.2 - 0.3

Nickel

1.65 - 2

Phosphorus

0.035 max

Silicon

0.15 - 0.3

Sulphur

0.04 max

 

2. Process:  EAF+LF+VD ( necessary) UT+ Rolled+Heat Treatment (optional)

 

3.Dlivery condition: hot rolled, annealing ton ≤ HB269

 

4.Surface conditions : scaled (hot working finish)/ground/rough machining/fine machining/based on the customer's requirement

 

5. Mechanical Properites :

tensile strength σb (MPa)

min 980(100)

elongation δ5 (%)

min 12

reduction of areaψ (%)

min 55

impact absorbed energy Akv (J)

min 78

notched bar impact strength αkv(J/cm2)

min98(10)

yield point σs (MPa)

min835(85)

 

6. Applications: Used for manufacture big sized important Quenched-and-Tempered parts which request good toughness and high strength.such as top load shaft in heavy-duty machinery;

For steam turbine shaft, vane, and heavy-load transmission parts, fastening piece, crankshaft, gears etc. with diameter is biger than 250mm

 

7.Physical Data

Density (lb / cu. in.)

0.28

Specific Gravity

7.8

Specific Heat (Btu/lb/Deg F - [32-212 Deg F])

0.116

Melting Point (Deg F)

2600

Thermal Conductivity

21

Mean Coeff Thermal Expansion

6.6

Modulus of Elasticity Tension

33

 

Packaging & Shipping

 

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Company Information

 

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