Stainless steel: resistant to weakly corrosive media such as air, steam and water, or stainless steel. The commonly used steel types are 304, 304L, 316, and 316L, which are 300 series steels of austenitic stainless steel.
Why do stainless steels have different grades?
During the smelting process of stainless steel, due to the different types of alloy elements added, the amount of different types is different. Its characteristics are also different. In order to distinguish them, different steel grades are crowned. The following is a table of the “alloy element” content of different steel grades of common decorative stainless steels for reference only:
Chemical composition (mass fraction,%)
304 stainless steel
Performance introduction
304 stainless steel is the most common steel type. As a widely used steel, it has good corrosion resistance, heat resistance, low temperature strength and mechanical properties; good hot workability such as stamping and bending, no heat treatment and hardening (non-magnetic , Then use the temperature -196 ℃ ~ 800 ℃).
Auto parts (windshield wiper, muffler, molded products)
Medical appliances, building materials, chemicals, food industry, agriculture, marine parts
-304L stainless steel-
(L is low carbon)
Performance introduction
As a low-carbon 304 steel, under normal conditions, its corrosion resistance is similar to that of 304, but after welding or stress relief, its resistance to grain boundary corrosion is excellent; it can also maintain good performance without heat treatment Corrosion resistance, use temperature -196 ℃ ～ 800 ℃.
Scope of application
Used in chemical, coal, and petroleum industry outdoor open-air machines with high requirements for resistance to grain boundary corrosion, heat-resistant parts for building materials and parts with difficult heat treatment.
