34CrNiMo6 Forged Alloy steel round bars aisi 4340 steel bar Q+T

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title :

34CrNiMo6 Forged Alloy steel round bars aisi 4340 steel bar Q+T

Type :

bar

Material :
stainless steel, carbon steel, galvanized, aluminum, copper, alloy steel

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AMS6416 300M/4340M alloy steel


300m steel is a kind of low alloy high strength steel, has become the world's highest strength, comprehensive performance is best, the most widely used one of the best gear steel and reputation.Its mechanical properties with high strength, high transverse plastic, high fracture toughness, fatigue performance and good corrosion resistance, etc.In China in the mid - 80 - s began AMS6417 copied by American aerospace material standard, and in 1990 by metallurgical and two joint technical appraisal of aeronautics and astronautics


AISI 4340 ultra high strength tensile steel round bar for aerospace application


Standards:ASTM,JIS,GB,EN(DIN,BS,NF) Or Per as clients’requires.


Product Basic Information:

Size Range
Round BarDiameter(mm)Length(mm)--
100~1000500~12000--

 

Chemical Composition(%)
CMnPSSiCrMoNiV

0.38-0.46

0.60-0.90

0.010Max.0.010max.1.45-1.800.70-0.950.30-0.651.65-2.000.05min.

  

1.Chemical Composition and Mechanical Properties(In Quenched & Tempered State):

Material

4340M

Chemical Composition

Mechanical Properties(In Quenched & Tempered State)

C

0.38-0.46

Tensile strength(MPA) 

1860

Si

0.17-0.37

Yield strength (MPA)

-

Mn

0.60-0.90

Elongation(δ5/%)

-

Cr

0.70-0.95

Reduction in Area (ψ/%)

25

Mo

0.30-0.65

Impact  (J)

23

P

0.010

 

Hardness  (Anealed Condition)

 

241HB

S

0.010

Cu

0.30

Ni

1.65-2.00

V

Min 0.05

 

2.Product Application Areas:


4340 steel USES vacuum arc melting technology to improve purity, plasticity, toughness, etc. AMS6416 standard USES non-vacuum smelting, which is the general aviation quality level. Other parts of the standard use vacuum smelting to achieve high quality aviation quality level.


By the standard heat treatment oil quenching and tempering, the tensile strength of the steel can reach more than 1860MPa, which is currently the highest strength of low-alloy ultra-high strength steel. High strength can reduce the weight of the parts, improving the strength has been one of the main goals of landing gear parts design. The main wing bearing components of the American aircraft are also 300M steel and used to the highest strength level.


3.Cherecteristics:


 The fatigue resistance of 4340M steel is obviously better than that of 4340. This is extremely beneficial for the long life of the landing gear and other aircraft components and is the main reason why 300M steel is widely used in aircraft.


It contains 1.5% silicon, which improves the stress corrosion resistance of 300M steel.


4.Produce process:


EAF + LF + VD + Forged + Heat Treatment -Annealed


Alloy Steel

4140,4142,42CrMo4,1.7225,SCM440,4130,SCM430,25CrMo4,1.7218,34CrNiMo6,

1.6582,4340,SNCM439,36CrNiMo4,1.6511,SACN645,1340,SMn438,SNC236,

Tool Steel

H13,1.2344,SKD61,D2,SKD11,1.2379,1.2510,01,SKS3,95MnWCr5,D3,SKD1,1.2419,

SKS31,H21,SKD5,1.2581,P20,35CrMo7,1.2738,1.2316,M2

Bearing Steel

GCr15,52100,SUJ1,SUJ2,100Cr6,1.2067,55C,8620,4320,9310,440C,M50

Spring Steel

9260,SUP6,SUP7,1.7108,54SiCr6,1.7102,5155,SUP9,1.7176,5160,1.7177,6150,

SUP10,51CrV4,1.8159

Stainless Steel

321,sus321,1.4541,304,SUS304,1.4301,410,SUS410,1.4006,420,1.4021,1.4028,

434,1.4113,316L,SUS316L,1.4435,630,1.4542,431,1.4057,


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