34CrNiMo6 Gear Steel Bar

 

34CrNiMo6(AISI 4340 / DIN 1.6582 /  EN 24) Steel is a nickel chromium molybdenum alloy steel that widely used in Oil & Gas industry. It is a quality high tensile alloy steel. 34CrNiMo6 steel offers toughness and high strength in the heat treated condition. 34CrNiMo6 is usually supplied under quenched and tempered condition at the hardness of 24 – 29HRc.

 

34CrNiMo6 is a quenching and tempering steel with high strength, high toughness and good hardenability. Used for large axles, machine components, tools and high strength fasteners.

 

The steel can be induction hardened and it is weldable under certain conditions. Through hardenability to appr. 100 mm diameter bar with oil quenching.

 

356D - Standard steel variant 

 

356Q - IQ (isotropic quality) variant.

 

6499  - low sulphur variant of 34CrNiMo6 Suitable for fasteners according to ISO 989 Grade 10.9 up to 90 mm bar diameter

 

6498 - A variant of the old swedish standard SS 2541

 

6502  -  M-steel variant of 34CrNiMo6

 

SB9205 - A variant of 34CrNiMo6

 

 

Chemical Composition:

 

C

Si

Mn

Cr

Mo

Ni

other

0,34

0,25

0,50

1,50

0,25

1,55

(Pb)

 

Mechanical Properties:

 

Diameter d [mm]

< 16

>16 – 40

>40 – 100

>100 – 160

>160 – 250

Thickness t [mm]

< 8

8<t<20

20<t<60

60<t<100

100<t<160

0,2% proof stress Rp0,2 [N/mm²]

min. 1000

min. 900

min. 800

min. 700

min. 600

Tensile strength Rm [N/mm²]

1200 - 1400

1100 - 1300

1000 - 1200

900 - 1100

800 - 950

Fracture elongation A5 [%]

min. 9

min. 10

min. 11

min. 12

min. 13

Reduction of area Z [%]

min. 40

min. 45

min. 50

min. 55

min. 55

Notch impact energy ISO-V [J]

min. 35

min. 45

min. 45

min. 45

min. 45

 

Application:

 

Heat treatable steel for high strained automotive and motor construc-

tion components with a typical tensile strength range of 1000 - 1300 N/mm².

 

 

Hot forming and heat treatment:

 

Forging or hot rolling: 1100 - 850°C

 

Normalising: 850 - 880°C/air

 

Soft annealing: 650 - 680°C/furnace

 

Hardening: 830 - 860°C/oil

 

Tempering: 540 - 660°C/air

 

 

Equivalent Grades: 

 

AISI/ASTM: 4340, 

BS: 817M40 / EN24, 

JIS: SCM447, 

DIN: 1.6582,

 

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