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40Mn round bars

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  • 29-May-2024

The material 40Mn is a kind of high-quality carbon structural steel under the standard GB/T 699-1988. 40Mn Chemical composition %:


Grade

Chemical composition %:

C

Si

Mn

S

P

Cr

Ni

Cu

40Mn

0.37-0.45

0.17-0.37

0.70-1.00

≤0.035

≤0.035

≤0.25

≤0.30

≤0.25

40Mn mechanical properties:


Grade

mechanical properties:

Tensile strength  σb
(Mpa)

Yield strength  σb
(Mpa)

Elongation  σb
(%)

reduction of area
ψ (%)

Hardness
No heat treatment

Impacting Energy Akv (J)

Notched bar impact strength
αkv (J/cm2)

min

min

min

min

max

min

min

40Mn

590(60)

355(36)

17

45

229HB

47

59(6)

Notes:
1, 40Mn specification: DIA 80-1200mm(forged round bar), 80-1200mm (square bar) Length 3-16 meters
2, 40Mn heat treatment: Quenching,Annealing,Normalizing and Tempering.
3, 40Mn tolerance: 0-+3mm(DIA), 0-+10mm (Length)

Steel round bars supplier

40Mn can be used under the condition normalizing, also can be used under Hardening and tempering. 40Mn has good machinability and 40Mn's cold plastic deformation is medium but Poor weldability under cold deformation. 40Mn is used in the manufacture of parts under fatigue load, such as shaft roller and work under the high stress of screw, nut, etc. 40Mn's hardenability is a little higher than 40# steel. 40Mn is also suitable for resistance to fatigue,the crankshaft, roll, axis, connecting rod.

Our company, KUNFENG can produce all sizes of 40Mn forged steel round bar, 40Mn forged square bar, 40Mn forged shafts and 40Mn forged blocks.

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