Comparison between SKD11 steel and S45C steel

Today, we would like to send you a title based on the most frequently asked questions from readers: "Can the parts made of SKD11 be replaced with S45C?" or "Why is it both axis but this axis is used S45C and the other axis must use SKD11?", ...

To answer your questions, Sevit would like to send to readers a detailed comparison analysis of SKD11 and S45C steel, hope that through this article, readers can choose the most appropriate material for your needs

1. Compare the chemical composition of SKD11 and S45C steel


Chemical composition

SKD11 (%)

S45C (%)



0,9 – 1,5

0,44 – 0,48



~ 12




~ 1




~ 0,25

0,15 – 0,25



~ 0,45

~ 0,6



≤  0,025

≤ 0,02


Lưu huỳnh

≤ 0,01

≤ 0,035



~ 0,35


As in the previous topics we mentioned, each component ratio has its own effect on the mechanics and applications of steel.

Therefore, we can easily see that the S45C contains only the main component, carbon, accounting for about 0.48%. This greatly affects the products made of S45C steel from ductility, hardness, abrasion resistance, heat resistance, oxidation resistance, glossiness, etc.

In contrast, SKD11 steel contains other components such as chromium, molybdenum, vanadium. They have a positive effect on the mechanical properties of SKD11 steel.

2. Compare the post-annealing hardness of SKD11 and S45C steel

About post-heat hardness of SKD11 can reach from 58 HRC to 60 HRC. Products after heat treatment always have high hardness, good abrasion resistance, along with the flexibility that still helps to minimize cracking and cracking during use.

The main method of heat treatment is vacuum evaporation. However, for some parts with special application will be heat treated by vacuum quenching method and ram in oil furnace.

What about S45C steel? S45C will be heat treated by quenching or tempering up to a hardness of about 55 HRC. Even up to 58 HRC, however, details will be very likely to encounter errors such as cracking, breaking, horizontal fracturing during use.

In addition, details will quickly rust even in normal environments because of the lack of chromium. In addition, the ability to withstand abrasion is very limited because of the lack of Molipden component, so that the shaft made of S45C steel has not long service life.

3. Compare SKD11 steel and S45C steel for application

S45C steel is used quite a lot to make details such as: Rollers in corrugated iron rollers, stretching machines of belt breakers, small load shafts and low rotation speeds, etc.

These are applications that do not require high quality. Steel materials, products made merely require long hard to wear and do not need ductility or impact resistance.

The nature of the steel structure S45C contains only carbon as a main component, so it cannot withstand impacts such as stress, wear resistance, balance of hardness and ductility, obviously the details will quickly be destroyed when use. However, the advantage of S45C steel is its low cost.

As for SKD11, it is known as a high-class steel line specialized in cold stamping. Besides, SKD11 steel is also used to make brick molds, religious knives, punches, belt breakers, steel rolling shafts, etc.

And the above applications have analyzed quite a lot in the previous articles, so in this topic we will not analyze further why SKD11 is used as the above products.

Hopefully the above information will solve the problems that readers are having. If you want to get more specific advice about industrial steels, readers can contact +84 332 91 61 61 or chat online with us.

4. Contact to buy / sell SKD11 steel or order online

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