Differences Between 4Cr13 and 40Cr13 Explained

1. Is 4Cr13 the same as 40Cr13?

4Cr13 and 40Cr13 are the same material, but they are written differently according to the standards of different periods.

4Cr13 is the material grade specified in the national standard GB1220-92 Stainless Steel Bar, and it is a stainless steel material with high hardness and wear resistance, often used as cutting tool, nozzle, valve seat, etc.

40Cr13 is the material grade specified in the national standard GBT1220-2007 Stainless Steel Bars (issued on May 14, 2007 and implemented on December 1, 2007, replacing GB1220-92 Stainless Steel Bars).

Differences Between 4Cr13 and 40Cr13 Explained 1

Similarly, the relationship between 1Cr13 and 12Cr13, 2Cr13 and 20Cr13, 3Cr13 and 30Cr13 is the same as above.

2. How to read 4Cr13 and 40Cr13?

4Cr13 reads: four chromium thirteen;

40Cr13 reads: four zero chromium thirteen.

3. What do 4 and 13 mean in 4Cr13?

4 in 4cr13 represents 0.4% carbon content. 0.4%=4‰, where “4” is the molecular value of 4‰.

“0.4%” is the middle value (0.36%+0.45%)/2=0.405% of the carbon content range of 4r13 specified in the national standard.

13 in 4Cr13 represents 13% chromium content, and 13% is the middle value (12+14)/2=13 in the range of 4Cr13 chromium content specified in the national standard.

4. What do 40 and 13 in 40Cr13 mean?

40 in 40Cr13 represents 0.4% carbon content. 0.4%=40‰, the “40” here is the molecular value of 40‰.

Attached figure: composition comparison table of martensitic stainless steel 40Cr13

Unified numerical code

New grade

Old brade

Chemical composition (mass fraction)/%

 

 

 

C

Si

Mn

P

S

Ni

Cr

S41010

12cr13

1Cr13

0.08-0.15

1

1

0.04

0.03

(0.6)

11.5-13.5

S42020

20Cr13

2Cr13

0.16-0.25

1

1

0.04

0.03

(0.6)

12-14

S42030

30Cr13

3Cr13

0.26-0.35

1

1

0.04

0.03

(0.6)

12-14

S42040

40Cr13

4Cr13

0.36-0.45

0.6

0.8

0.04

0.03

(0.6)

12-14

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