Medical grade stainless steel is used for saving lives and aiding the injured.
The approximate composition is a combination of elements such as iron, chromium, and carbon.
Household stainless steel can be divided into three grades: 430, 304 (18-8), and 18-10.
Medical stainless steel (18-10): made of+18% chromium and+10% nickel,
To make it more durable and corrosion-resistant,
There is no precipitation of metal ions at all,
This type of stainless steel is called 18-10 stainless steel.
Due to its durability and complete properties,
Mainly used in the manufacturing of medical devices and tableware.
1： 304/304L
·The chromium content of 304 stainless steel is at least 18%,
The nickel content should be at least 8%,
Therefore, it is also known as 18/8 stainless steel.
This stainless steel has
Excellent oxidation and corrosion resistance, making it the most widely used,
The most common austenitic stainless steel is widely used
Produce equipment and components that require good comprehensive performance (corrosion resistance and formability).
·304L is a variant of 304 stainless steel with lower carbon content,
Used in situations where welding is required.
The lower carbon content results in the heat affected zone near the weld seam
Minimize the precipitation of carbides,
The precipitation of carbides may lead to stainless steel
In certain environments, intergranular corrosion (welding erosion) occurs.
2： 316 contains at least 16% chromium, 10% nickel, and 2% molybdenum,
The main difference between 304 and 316 stainless steel is that,
316 stainless steel contains molybdenum.
The addition of molybdenum improves corrosion resistance,
Because molybdenum is a transition metal,
Has high corrosion resistance,
It also gives 316 stainless steel high heat resistance up to 871 ℃.
If the environment contains a large amount of corrosive elements,
For underwater applications, 316 stainless steel is preferred.
3： 410 stainless steel is one of the most commonly used martensitic stainless steels,
It contains about 12% Cr,
Therefore, it has moderate corrosion resistance.
Unlike austenite (such as AISI304 and AISI316),
Martensite has magnetism,
It can be hardened through heat treatment of carbon steel and low-alloy steel.
4： 420 stainless steel,
Belonging to the “cutting tool grade” martensitic stainless steel,
Basically, it’s the high carbon version of 410,
Can provide higher strength,
Has a certain degree of wear resistance,
Corrosion resistance and high hardness.
This type of stainless steel is used to manufacture parts that are resistant to air, water vapor, water, and oxidizing acids,
For example, bearings, instruments, household appliances, rails, etc,
Also used as surgical knives,
It can be made very shiny
5： 440 (A/B/C) belongs to high-strength cutting tool steel,
Slightly higher carbon content,
Belonging to the hardest stainless steel.
The most common application case is “razor blade”