炭素鋼 vs stainless steel? In engineering and construction projects, the selection of the right steel pipe can ensure the reliability and durability of the system, while playing a crucial role in economic efficiency.
Carbon steel vs stainless steel, are two commonly used pipes, they have their properties, but also suitable for different application scenarios. So carbon steel vs stainless steel, how to distinguish and how to choose, dose carbon steel rust,can be considered from these factors.
Difference Between Stainless Steel vs Carbon Steel
Both stainless steel and carbon steel tubes are ideal for multiple functions, so determining which one is right can be quite difficult. With an in-depth understanding of the characteristics of steel pipes and the basics of application methods, you can more accurately determine which steel pipe best meets your current practical needs.
1. Process
Carbon steel process
How strong is steel? Carbon steel pipes can be classified into two categories: hot-rolled and cold-rolled.
- Hot rolled carbon steel pipe: hot rolled carbon steel pipe is divided into general steel pipe, geological steel pipe, low and medium-pressure boiler steel pipe, high-pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, oil cracking pipe, and other kinds of steel pipe.
- Cold rolled carbon steel pipe: In addition to general steel pipe, low and medium-pressure boiler steel pipe, high-pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, oil cracking pipe, and other steel pipes, also includes carbon thin-wall steel pipe, alloy thin-wall steel pipe, stainless steel thin-wall steel pipe, and shaped steel pipe.
Stainless steel process
Stainless steel pipes can be classified into various types according to differences in production techniques and shapes.
- プロセス: stainless steel seamless steel pipe and stainless steel welded steel pipe (welded steel pipe).
- Outer diameter shape of steel pipe: round pipe and shaped pipe. Circular steel pipes are widely used, but there are also some other special-shaped steel pipes, such as square, rectangular, semicircular, hexagonal, equilateral triangle, octagonal steel pipes, and so on.
2. Chemical composition
The main difference between carbon steel vs stainless steel is the ingredients added to the steel to make it achieve its intended purpose.
1. Normally, the percentage carbon in steel formulations is between 0.2% and 2.1%.
To enhance other properties of the base iron, the mixture may also contain chromium, manganese, or tungsten. Different proportions of these elements produce steels with target values of ductility, tensile strength, and hardness.
Carbon steel is mainly through the presence of carbon to create a durable alloy material. Other elements may be present in carbon steel, such as manganese, cobalt, or tungsten, but the proportions of these elements are not specified. Four different types of carbon steel are listed below:
- Mild/low — contain very low percentages of carbon
- Medium — 0.3 to 0.59% carbon by weight
- High — 0.6 to 0.99% carbon
- Ultra high — 1.0 to 2.0% carbon
These alloys are capable of withstanding the heat treatment process successfully. In contrast, the steel produced by these formulations is both strong and durable.
However, the specification performance of carbon steel in terms of ductility is not ideal.
2. corrosion resistance
In addition, it is also a common problem in most steel formulations, that is susceptible to corrosion. Corrosion is caused by the oxidation of the metal to a more stable molecular state, which reduces the mechanical strength of the base steel. After several years of use, the bridge may show significant corrosion damage. Bridges that had the potential to last 100 years had to be repaired or replaced due to corrosion.
Stainless steel is a unique type of steel that is not easily corroded. It achieves this property by using chromium as a special hardener. Most stainless steels have a chromium content of 10.5% to 11.0%. Through the use of chromium, stainless steel has the characteristics of not rusting in addition to the basic characteristics of steel.
Just like carbon steel, stainless steel reacts with oxygen in the air to form an oxide layer. However, instead of forming a layer of iron oxide, it forms a layer of chromium oxide. Iron oxide is a volatile molecule that continuously contributes to the oxidation process. In contrast, chromium oxide has inert properties. It builds a protective layer to avoid further oxidation.
3. Material OPerformance Parameter
The material performance parameters of carbon steel and stainless steel differ significantly.
1. Density: Take ASTM A36 carbon steel そして 304ステンレス鋼 for example.
- ASTM A36 carbon steel hardness is generally 126-197HB, density 7.85g/cm³.
- 304 stainless steel hardness is generally 187HB, density is 7.93g/cm³.
2. Ambient temperature and pressure
- In the static load structure of the load-bearing requirements of the high preference for carbon steel materials, its ability to 425 ℃ high temperature environment still maintains the stability of the structure, the yield strength of 345MPa from.
- Carbon steel casting standards are very strict technical specifications. For example, 570 ℃ high-temperature steam environment, the use of ZG15Cr1MoV castings manufacturing thermal power generating units. JB / T 9625 standard requires hydraulic valve pressure capacity to reach 63MPa.
- Carbon steel welding interlayer temperature to maintain greater than or equal to 150 ℃, and will be in advance of the preheating temperature control in 150-200 ℃.
- And stainless steel TIG welding process, argon gas filling at the back can prevent oxidation. More complex and humid environment preferred annual corrosion rate <0.05mm stainless steel.
|
炭素鋼 |
ステンレス鋼 |
|
|
Ingredient |
Alloy of iron and carbon |
Alloy of iron and chromium |
|
耐食性 |
Can rust |
優れた耐食性 |
Application scenario |
Building structures, transport pipelines, logistics, manufacturing, water treatment and water supply |
Food processing, medicine, petrochemicals and Marine engineering |
|
Cost consideration |
cheap |
costly |
|
溶接性 |
Low carbon steel pipe has excellent weldability, high carbon steel pipe needs to take some special welding technology and pretreatment measures |
Second only to carbon steel, Consider the specific type and characteristics of the material |
|
加工性 |
It can be machined into different shapes and sizes by a variety of methods such as bending, cutting, and joining |
More difficult to process |
Carbon Steel vs Stainless Steel Conclusion
Carbon steel vs stainless steel, the choice depends on the specific needs of the application, each type of pipe has advantages and limitations, and appropriate selection can play the maximum performance advantage of the steel pipe, and extend the engineering life.
Carbon steel pipe is a very popular choice of steel pipe material for a wide range of uses. By selecting the right type of carbon steel pipe and ensuring that it is properly maintained and maintained, they can maintain stable and reliable performance for a long time, to meet the requirements of various engineering projects.
At TUSPIPE, we produce and export high-quality carbon steel pipes. We are a leading manufacturer in China’s steel pipe industry. You can go to our ユーチューブ to watch the steel pipe production process.
