1.Specification of  4140 alloy steel

       Round bar 

Hot rolled

Forged

Diameter(mm) :14~200

Length (mm): 2000~6000

Diameter(mm) :210~800

Length (mm): 2000~6000

         Plate

Thickness(mm)  

Width (mm)       

Length (mm)    

14-500

200-2300

2000-6000

The specification can be customised!

2.Chemical compositon of 4140 alloy steel

NO.

C

Mn

Si

Cr

Mo

Ni

P

S

Aisi 4140

0.33~0.38

0.75~1.00

0.15~0.35

0.80~1.10

0.15~0.25

-

≤0.035

≤0.040

3. Mechanical properties of 4140 alloy steel

Tensile str. (N/mm2)

Yield point (N/mm2)

                Elongation (%)

              Hardness

               980

835

                          12

269 

4.Heat treatment of 4140 alloy steel  

1. Forging:Heat slowly and uniformly to 1000°C. After forging cool slowly.

2. Annealing: 780-800`C slow cooling

3. Annealed Hardness:200-230HB

4.Oil Hardening:840-860    

Tempering:470-560

5. HRC Secondar Hardness:41-52

5.Characteristic of 4140 alloy steel  

1.High strength and toughness !

2.Good hardenability and the quenching deformation is small!

3.Good processability and easy polishing.

4.Easy texture and platable.

5.The strength and section are bigger than 35CrMo(4135).

6.Application of 4140 alloy steel  

1.Suitable for unibody electrical and electronic mold.

2.For plastic mould and die holders.

Hot work tool steel

DIN

1.2344,1.2343,1.2365,1.2581,1.2367,1.2713 etc.

AISI

H13,H11,H10,H21, etc.

JIS

SKD61,SKD6,SKD5,SKT4 etc.

Cold work tool steel

DIN

1.2601,1.2379,1.2080,1.2363,1.2842,1.2419,1.2510,1.2550,1.2767 etc.

AISI

D2,D3,D5,D6,D8,A2,O2,O1 etc.

JIS

SKD1,SKD11, SKS3 etc.

Plastic mould steel

DIN

1.2083,1.2311, 1.2316,1.2738 etc.

AISI

P20, P20+Ni, 420 etc.

JIS

NAK80

High speed tool steel

DIN

1.3355,1.3343

AISI

T1,M2,M35,M42

JIS

SKH2,SKH51

Structural alloy steel

DIN

1.7225,1.6511,1.7035,1.7220

AISI

4,140,434,051,404,130

JIS

SCM440