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AS VCN 150 AISI 4340

1.Chemical composition of Forged Steel Bar 4340( DIN 1.6511/ GB 40CrNiMo) :

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. Mechanical Properites of Forged Steel Bar 4340( DIN 1.6511/ GB 40CrNiMo) :
tensile strength à b ( MPa)
min 980( 100)
elongation ´ 5 ( % )
min 12
reduction of areaÈ ( % )
min 55
impact absorbed energy Akv ( J)
min 78
notched bar impact strength ± kv( J/ cm2)
min98( 10)
yield point
835

3.Dlivery condition ofForged Steel Bar 4340/ DIN 1.6511/ GB 40CrNiMo Hardness : HB 265~ 310, Hardened& tempered.
4. Specification of Forged Steel Bar 4340/ DIN 1.6511/ GB 40CrNiMo:
Forged Steel Bar 4340 / DIN 1.6511/ GB 40CrNiMo Flat bar: Thickness: 23~ 600mm, Width: 102~ 1200mm,
Forged Steel Bar 4340/ DIN 1.6511/ GB 40CrNiMo Round: 25~ 360mm
5. Principal Design Features of Forged Steel Bar 4340/ DIN 1.6511/ GB 40CrNiMo: Forged Steel Bar 4340 / DIN 1.6511/ GB 40CrNiMo is a heat treatable, low alloy steel containing nickel, chromium and molybdenum. It is known for its toughness and capability of developing high strength in the heat treated condition while retaining good fatigue strength.
6. Applications of Forged Steel Bar 4340/ DIN 1.6511/ GB 40CrNiMo: Typical applications of Forged Steel Bar 4340/ DIN 1.6511/ GB 40CrNiMo are for structural use, such as aircraft landing gear, power transmission gears and shafts and other structural parts.
7.Physical Data of Forged Steel Bar 4340 / DIN 1.6511/ GB 40CrNiMo

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
8.Surface conditions of Forged Steel Bar 4340 / DIN 1.6511/ GB 40CrNiMo: scaled ( hot working finish) / ground/ rough machining/ fine machining/ based on the customer' s requirement
9.Furnaces for metallurgical processing of Forged Steel Bar 4340/ DIN 1.6511/ GB 40CrNiMo: electrode arc + LF/ VD/ VOD/ ESR/ Vacuum consumable electrode.
10.Ultrasonic inspection of Forged Steel Bar 4340/ DIN 1.6511/ GB 40CrNiMo: 100% ultrasonic inspection for any inperfections or based on the customer' s requirement
11. Other Comments of Forged Steel Bar 4340/ DIN 1.6511/ GB 40CrNiMo : Alloy steel bar AISI 4340 is considered to be a " through hardening" steel such that large section sizes can still be heat treated to high strength

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