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Product Introduction

X2CrNi18-9 belongs to the German standard austenitic stainless steel, the implementation standard: DIN 17440-1979

X2CrNi18-9 stainless steel, also known as ultra-low carbon stainless steel, is a versatile stainless steel material widely used in the production of equipment and parts that require good overall performance (corrosion resistance and formability).

The chemical composition of X2CrNi18-9 is as follows:

Austenitic stainless steel refers to stainless steel with austenitic structure at room temperature. When the steel contains about 18% Cr, 8%~25% Ni, and about 0.1% C, it has a stable austenite structure. Austenitic chromium-nickel stainless steel includes the famous 18Cr-8Ni steel and high Cr-Ni series steel developed on the basis of increasing Cr and Ni content and adding Mo, Cu, Si, Nb, Ti and other elements. Austenitic stainless steel is non-magnetic and has high toughness and plasticity, but its strength is low, and it is impossible to strengthen it through phase transformation. It can only be strengthened by cold working. If S, Ca, Se, Te and other elements are added, it has good properties. Machinability.

Stainless steel can be divided into five categories according to the microstructure after heat treatment

1. Ferritic stainless steel

Ferritic stainless steel (400 series) contains 15% to 30% chromium and has a body-centered cubic crystal structure. This type of steel generally does not contain nickel and sometimes contains a small amount of Mo, Ti, Nb, and other elements. This type of steel has the characteristics of large thermal conductivity, small expansion coefficient, good oxidation resistance, and excellent stress corrosion resistance. , water vapor, water, and oxidizing acid corrosion parts. The price of ferritic stainless steel is not only relatively low and stable but also has many unique features and advantages. It has been proved that ferritic stainless steel is a very Excellent alternative material, ferritic stainless steel does not contain nickel, the main elements are chromium (>10%) and iron, chromium is a particularly corrosion-resistant element of stainless steel, and its price is relatively stable.

2. Martensitic stainless steel

Stainless steel whose mechanical properties can be adjusted by heat treatment, in layman's terms, is a type of hardenable stainless steel. Typical grades are Cr13 type, such as 2Cr13, 3Cr13, 4Cr13, and so on. After quenching, the hardness is higher, and different tempering temperatures have different combinations of strength and toughness. It is mainly used for steam turbine blades, tableware, and surgical instruments. According to the difference in chemical composition, martensitic stainless steel can be divided into two types: martensitic chromium steel and martensitic chromium-nickel steel. According to the structure and strengthening mechanism, it can also be divided into martensitic stainless steel, martensitic and semi-austenitic (or semi-martensitic) precipitation-hardening stainless steel, and maraging stainless steel.

3. Austenitic stainless steel

Austenitic stainless steel refers to stainless steel with an austenitic structure at room temperature. When the steel contains about 18% Cr, 8%~25% Ni, and about 0.1% C, it has a stable austenite structure. Austenitic chromium-nickel stainless steel includes the famous 18Cr-8Ni steel and high Cr-Ni series steel developed on the basis of increasing Cr and Ni content and adding Mo, Cu, Si, Nb, Ti, and other elements. Austenitic stainless steel is non-magnetic and has high toughness and plasticity, but its strength is low, and it is impossible to strengthen it through phase transformation. It can only be strengthened by cold working. If S, Ca, Se, Te, and other elements are added, it has good properties. Machinability.

4. Precipitation-hardened stainless steel

Precipitation hardening stainless steel refers to the addition of different types and quantities of strengthening elements on the basis of the chemical composition of stainless steel, and the precipitation of different types and quantities of carbides, nitrides, carbonitrides, and intermetallic compounds through the precipitation hardening process, a type of high-strength stainless steel that not only improves the strength of the steel but also maintains sufficient toughness, referred to as PH steel. Precipitation-hardening stainless steel can be divided into three types according to the metallographic structure of the matrix: martensitic, semi-austenitic, and austenitic.

Detection Systems

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