ПОЛНОЕ руководство по выбору нержавеющей стали 201: J1, J2, J3, J4

 

201 stainless steel is widely used in everyday products because of its excellent cost-effectiveness and versatility. However, did you know that in China, 201 stainless steel is classified into four distinct types—J1, J2, J3, and J4? Each has unique characteristics suited for different applications. In this guide, we’ll walk you through everything you need to know about these types, helping you unlock a whole new understanding of 201 stainless steel. So, sit back and get ready to dive into the most comprehensive breakdown of 201 stainless steel in China!

 

 

What is 201J1, J2, J3, J4 Stainless Steel?

201 Stainless Steel is a cost-effective alternative to higher-end alloys such as 304, and is primarily used in applications where corrosion resistance and strength are required, but where cost savings are a priority. Within the 201 series, J1, J2, J3 and J4 are the four main sub-types commonly used in China, each with unique compositions for different applications.

 

At the end of the 20th century, dramatic fluctuations in the global price of nickel resources led to a significant increase in the cost of traditional high-nickel stainless steels such as 304. In response to this challenge, Chinese metallurgical companies developed the 201 series of stainless steels with reduced nickel content and increased manganese and nitrogen to reduce costs. In addition, with the rapid development of China's manufacturing industry and the surge in demand for stainless steel materials, 201 stainless steel has gradually been refined into subcategories such as J1, J2, J3, and J4 to meet the diversified needs of a wide range of industries, from construction and household to machinery. These subcategories balance cost, performance and processability, and promote the localization process and industrial upgrading.

 

 

J1 Stainless Steel (Medium Copper)

J1 stainless steel has moderate copper content and slightly higher carbon content compared to J4. It is known for its balanced processing performance, making it suitable for general applications involving shallow and deep drawing, such as:

- Decorative panels

- Bathroom fixtures

- Sinks

- Pipes

 

J1 is often seen as a good, versatile option for products where formability and moderate corrosion resistance are required.

 

 

J2 Stainless Steel (High Hardness)

J2 has the highest carbon content in the J-series, which makes it very hard. This hardness, however, comes at the expense of ductility. J2 is ideal for applications that require good appearance and high surface hardness but are not subject to bending or heavy deformation, such as:

- Decorative pipes

- Simple architectural elements

 

However, due to its high brittleness, it is not recommended for products that require significant bending or shaping, such as square or bent pipes.

 

 

J3 Stainless Steel (Low Copper)

J3 contains less copper than J1 and J4 but more than J2. It strikes a balance between strength and formability, making it suitable for lightweight, less critical structures. Its typical applications include:

- Mechanical frames

- Furniture

- Display racks

 

J3 can be a cost-saving alternative for manufacturers who need moderate corrosion resistance and basic formability.

 

 

J4 Stainless Steel (High Copper)

J4 is the premium version of the 201 series, featuring the highest copper content. This addition improves its formability and corrosion resistance compared to other types in the J-series. J4 is the preferred material for more demanding applications that require deep drawing, such as:

- Sinks

- Kitchenware

- Automotive parts

- Household products exposed to moisture

 

It is ideal for environments with moderate corrosive exposure, although it cannot match the corrosion resistance of higher-end alloys like 304 and 316.

 

Chemical Composition of Type 201 Stainless Steel J1 J2 J3 J4
Оценка	С	Ни	Кр	Мн	Cu	Си	П	С	N	Mo
201 J1	0.104	1.21	13.92	10.07	0.81	0.41	0.036	0.003	0.80-1.50
201 J2	0.128	1.37	13.29	9.57	0.33	0.49	0.045	0.001	0.155
201 J3	0.127	1.3	14.5	9.05	0.59	0.41	0.039	0.002	0.177	0.02
201 J4	0.06	1.27	14.86	9.33	1.57	0.39	0.036	0.002

How to Choose the Right Type of 201 Stainless Steel

When selecting the appropriate 201 stainless steel type, consider the following factors:

 

1. Application Complexity: If your product requires complex deep drawing or bending, such as sinks or kitchenware, J4 will provide better performance due to its higher copper content and formability. J1 is also suitable but slightly less formable than J4.

 

2. Hardness Requirements: If your application needs a harder material for better durability in decorative uses, J2 or J3 could be better choices. J2 is especially suited for decorative pipes but be cautious with bending, as it may crack.

 

3. Коррозионная стойкость: For products exposed to moisture or mild corrosive environments, J4 will perform better due to its higher copper content. J1 offers moderate corrosion resistance, making it suitable for indoor applications like sinks and decorative panels.

 

4. Cost Efficiency: If cost is a primary concern, J3 or J2 are the more affordable options, but they should only be used in low-stress applications where hardness is prioritized over flexibility and corrosion resistance.

 

 

Заключение

Each subtype of 201 Stainless Steel offers different strengths based on its composition, allowing manufacturers to select the most appropriate material for specific needs.J1 and J4 are versatile and suitable for most tensile applications, while J2 and J3 are more cost-effective for decorative, non-structural components. For more information on stainless steel selection, don't hesitate to contact one of our knowledgeable sales representatives.