4Cr13 vs. 40Cr13: esclarecendo a confusão

4Cr13 vs. 40Cr13: clearing up the confusion

1. Is 4Cr13 the same as 40Cr13?

“4Cr13” and “40Cr13” refer to the same material, but are named differently based on standards used in different time periods.

4Cr13″ is the material type specified in the national standard GB1220-92 for stainless steel bars. It is a high-hardness, wear-resistant stainless steel often used in cutting tools, nozzles, valve seats and other applications.

“40Cr13” is the material type listed in the GBT1220-2007 national standard for stainless steel bars. This standard was issued on May 14, 2007 and came into force on December 1, 2007, replacing the GB1220-92 standard.

Likewise, the relationship between 1Cr13 and 12Cr13, 2Cr13 and 20Cr13 and 3Cr13 and 30Cr13 is the same as described previously.

2. How to read 4Cr13 and 40Cr13?

4Ch13 says: four chrome thirteen;

40Cr13 says: four zero chrome thirteen.

3. What do 4 and 13 in 4Ch13 mean?

The number “4” in 4Cr13 represents the carbon content, which is 0.4%. This value can be expressed as 4‰, where “4” is the molecular equivalent of 4‰. The carbon content of 4Cr13 is within the range specified by the national standard, with an average of 0.405% (calculated as the average of 0.36% and 0.45%).

The number “13” in 4Cr13 represents the chromium content, which is 13%. This value is the average of the range specified by the national standard for chromium content in 4Cr13, which is between 12% and 14%.

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

The number “40” in 40Cr13 represents the carbon content, which is 0.4%. This value can be expressed as 40‰, where “40” is the molecular equivalent of 40‰. The composition comparison table of 40Cr13 martensitic stainless steel is attached for reference.

Unified numeric code New note old note Chemical composition
(mass fraction)/%
W Yes Mn P s No Cr
S41010 12cr13 1Ch13 0.08-0.15 1 1 0.04 0.03 （0.6） 11.5-13.5
S42020 20Cr13 2Ch13 0.16-0.25 1 1 0.04 0.03 （0.6） 12-14
S42030 30Cr13 3Ch13 0.26-0.35 1 1 0.04 0.03 （0.6） 12-14
S42040 40Cr13 4Ch13 0.36-0.45 0.6 0.8 0.04 0.03 （0.6） 12-14

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