碳钢和不锈钢有什么区别?

我们使用的很多精密零件都是不锈钢材质. 它具有高硬度, 强度和耐腐蚀性, 而且闪亮非常好看. 实际上, in addition to stainless steel, carbon steel is also very widely used in industry. So do you know the difference?

The difference between the stainless steel and carbon steel

(1) Corrosion and wear resistance

不锈钢是一种耐空气等弱腐蚀介质腐蚀的合金, 蒸汽和水以及化学侵蚀性介质，例如酸, 碱和盐. 而这个功能主要归功于不锈钢元素的添加 – 铬. 当铬含量大于 12%, 不锈钢表面会形成一层氧化膜, 俗称钝化膜, 有了这层氧化膜就不容易溶解在某些介质中, 起到良好的隔离作用, 具有很强的耐腐蚀性.

碳钢是指碳含量小于 2.11% 铁碳合金的, 也称为碳钢, 它的硬度远高于不锈钢, 但重量更大, 可塑性较低, the typical “too rigid and easy to fold”, 容易生锈.

(2) different composition

Stainless steel (不锈钢) is the abbreviation of stainless acid-resistant steel, air, steam, water and other weak corrosive media. And will be resistant to chemical corrosive media (acids, alkalis, salts and other chemical impregnation) corrosion of the steel is called acid-resistant steel.

Carbon steel is an iron-carbon alloy with a carbon content of 0.0218% to 2.11%. Also called carbon steel. It also generally contains small amounts of silicon, manganese, sulfur, and phosphorus.

(3) Cost

Another important consideration is the cost.
Although different steels have different costs, stainless steel is generally more expensive than carbon steel. Largely due to the addition of various alloying elements, such as chromium, nickel, and manganese, to stainless steel.

Compared to carbon steel, stainless steel has a large number of other alloys mixed in and more expensive . On the other hand, carbon steel mainly consists of relatively cheap elements of iron and carbon.
If you are on a tight budget for your project, then carbon steel may be the best option.