SCM440 1.7225 4140

  • SCM440 1.7225 4140
  • SCM440 1.7225 4140
  • SCM440 1.7225 4140
SCM440 1.7225 4140

SCM440 1.7225 4140 General cold work die steel with good machinability,to be made die casting mold,extrusion and injection mold and ejector pins,ejector sleeve,punches,block gauge,measuring tools.
High wear resistance,high toughness,small deformation caused by heat treatment.
Have a high and uniform hardness after heat treatment,heat resisting,resistance to high temperature oxidation,good toughness,machinability and weldability.
Annealing ≤HB229,pre-hardened HRC 26-32.

 General Information:

Chromium molybdenum high tensile steel with yield strength of 550N/mm2.

Chromium renders steel oil hardenable and increase hardenability.

Weldability suffers with increasing chromium content. 

High temperature strength and high pressure hydrogenation properties are promoted by chromium and molybdenum.

Molybdenum significantly reduces temper brittleness.

 

Delivery condition: 

cold drawn round bar/ QT round bar

 

Comparable Standards:   

AISI/SAE

DIN

W.Nr.

JIS

4140

42CrMo4

1.7225

SCM440

 

 Chemical Analysis (%):  

C

Mn

Si

Cr

Mo

P

S

0.38-0.45

0.60-0.90

0.15-0.40

0.90-1.20

0.15-0.30

0.035

 ≤0.035

   

 Hot work and Heat treatment temperatures:   

Forging

Normalization

Subcritical annealing

Isothermal annealing

Hardening

Tempering

1100~900

860~880

680~720

830~900
670x3h

830~860 oil

550~650

 

Machanical Properties:                                                                                                                                                    

Tensile str. (N/mm2)

Yield point (N/mm2)

Elongation (%)

Contraction (%)

Impack work (J/cm2)

Hardness (HB)

1080

930

12

45

63

217

 

Delivery Specification and Technical Condition

 Coil

Size

mm

Tolerance

mm

Ovality

mm

Φ1.5-Φ3.0

±0.01

≤0.01

Φ3.1-Φ6.0

±0.015

≤0.015

Φ6.1-Φ16.0

±0.018

≤0.018

Φ16.1-Φ20.0

±0.02

≤0.020

Φ20.1-Φ25.0

±0.03

≤0.030

 

Cold Drawing Round Bar

Size

mm

Tolerance

mm

Straightness

mm/m

Ovality

mm

Φ2.0-Φ4.0

±0.01

≤0.50

≤0.01

Φ4.1-Φ6.0

±0.015

≤0.70

≤0.015

Φ6.1-Φ13.0

±0.02

≤0.70

≤0.02

Φ13.1-Φ18.0

±0.025

≤0.70

≤0.025

Φ18.1-Φ25.0

±0.030

≤0.70

≤0.03

Φ25.1-Φ50.0

±0.05

≤0.70

≤0.05

  

Centerless Grinding Round Bar (Annealing condition)

Size

mm

Tolerance

mm

Straightness

mm/m

Ovality

mm

Φ2.0-Φ4.0

±0.01

≤0.50

≤0.01

Φ4.1-Φ6.0

±0.01

≤0.50

≤0.01

Φ6.1-Φ13

±0.01

≤0.50

≤0.01

Φ13.1-Φ18.0

±0.015

≤0.50

≤0.015

Φ18.1-Φ25.0

±0.015

≤0.50

≤0.015

Φ25.1-Φ35.0

±0.02

≤0.50

≤0.02

Φ35.1-Φ50.0

±0.03

≤0.50

≤0.03

  

Centerless Grinding Round Bar (Pre-hardened condition)

Size

mm

Tolerance

mm

Straightness

mm/m

Ovality

mm

Φ1.5-Φ4.0

±0.01

≤0.50

≤0.01

Φ4.1-Φ6.0

±0.01

≤0.50

≤0.010

Φ6.1-Φ13.0

±0.01

≤0.50

≤0.01

Φ13.1-Φ18.0

±0.015

≤0.50

≤0.015

Φ18.1-Φ25.0

±0.015

≤0.50

≤0.015

Φ25.1-Φ35.0

±0.02

≤0.50

≤0.02

Φ35.1-Φ50.0

±0.03

≤0.50

≤0.03

 

 Peeling Round Bar

Size

mm

Tolerance

mm

Straightness

mm/m

Ovality

mm

Φ5.0-Φ13.0

±0.04

≤0.60

≤0.04

Φ13.1-Φ20.0

±0.04

≤0.70

≤0.04

Φ20.1-Φ35.0

±0.5

≤0.70

≤0.05

Φ35.1-Φ60.0

±0.06

≤0.80

≤0.06

Φ60.1-Φ80.0

±0.07

≤0.80

≤0.07

Φ80.1-Φ120.0

±0.08

≤1.00

≤0.08

 

 Delivery hardness

 annealed condition ≤255HB

 QT condition: 28-32HRC or as per customer requirement

<img src="https://img.waimaoniu.net/2326/2326-202104251003154352.jpg" style="width: 800px;" width="800" border="0" vspace="0" title="pre-hardened 26-32HRC 4140""/>


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