What is 0Cr13Al?

SUS405 is a low-alloy heat-resistant ferritic stainless steel. It is an environmentally friendly and energy-saving steel material. It can be used in the manufacture of boilers, environmental protection equipment and high-temperature sulfur corrosion-resistant equipment in the petrochemical industry.

What is the chemical composition of 0Cr13Al?

C≤0.08

Si≤1.00

Mn≤1.00

P≤0.040

S≤0.030

Cr11.50~15.50

Ni≤0.60

Al 0.1~0.3

What are the mechanical properties of 0Cr13Al?

Tensile strength σb (MPa): quenched and tempered, ≥490

Conditional yield strength σ0.2 (MPa): quenched and tempered, ≥345

Elongation δ5 (%): Quenching and tempering, ≥24

Reduction of area ψ (%): Quenching and tempering, ≥60

Hardness: annealed, ≤183HB

What is the heat treatment specification of 0Cr13Al?

Annealing, slow cooling at 800~900°C or rapid cooling at about 750°C; 2) Quenching (solid solution), oil cooling at 950~1000°C; 3) Tempering, rapid cooling at 700~750°C.

What is the metallographic structure of 0Cr13Al?

The microstructure of 0Cr13Al is martensitic.

What are the applications of 0Cr13Al stainless steel?

This stainless steel is suitable for a wide variety of applications including:

- Petrochemical equipment

- Heat exchangers

- Pipe work

- Boiler feedwater heaters

- Pressure vessels

- Rotating drums and media storage tanks

What are the advantages of 0Cr13Al stainless steel?

 0Cr13Al stainless steel is one of the most popular and versatile types of steel on the market. Its many benefits include rust resistance, durability, and ease of fabrication.

This type of steel is easy to weld, cut, and machine, making it ideal for a wide range of applications. It can be used in both indoor and outdoor environments thanks to its resistance to corrosion. 0Cr13Al stainless steel is also a cost-effective material when compared to other types of steel.

What are the disadvantages of 0Cr13Al stainless steel?

0Cr13Al stainless steel is susceptible to corrosion from a variety of environmental conditions. The most common type of corrosion is known as pitting, which occurs when small holes form in the surface of the metal. This can be caused by exposure to high levels of humidity or chemical pollutants. In addition, 0Cr13Al stainless steel is not immune to stress corrosion cracking, which can occur when the metal is exposed to high levels of tension or stress.

What is the production process route of 0Cr13Al?

 According to the characteristics of steel grades and equipment conditions, the production process of SUS405 is designed as follows: blast furnace hot metal → treatment at the "three removal" station → GOR furnace smelting → aluminum alloying → LF furnace refining → full protection casting.

In order to ensure the mechanical properties and heat resistance of steel, the control level of carbon and nitrogen content, aluminum content, and inclusions is required to be high, and the smelting process conditions are harsh. The problems that must be solved are: the realization and cost control of low carbon nitrogen stainless steel smelting; the deoxidation of low carbon nitrogen stainless steel and the control of inclusions; the guarantee of the finished aluminum content.

What is the process design of 0Cr13Al?

SUS405 is smelted with all molten iron. In the early stage of smelting, due to the high carbon content of molten iron, the oxygen supply intensity is the limiting link of the carbon-oxygen reaction. Therefore, increase the oxygen supply intensity of the top lance, gradually adjust the lance position, rapidly increase the decarburization temperature, provide a suitable temperature for the subsequent decarburization of the low-carbon area, and shorten the smelting cycle. When the carbon content reaches the target value and the temperature is suitable, stop the top blowing and continue the bottom blowing.

Under the premise of ensuring the production rhythm, a decarburization sub-section is added in the late stage of decarburization, and decarburization is carried out in the ultra-low carbon area, and the oxygen-argon ratio of this section is appropriately increased to avoid a large amount of chromium during oxidation and decarburization. The target control is [C]≤0.05%.

What is the deoxidation process design of 0Cr13Al?

The carbon content of SUS405 is about 0.03%. According to the principle of carbon-oxygen balance, the oxygen content in molten steel must be higher than that of ordinary stainless steel (ordinary stainless steel [C] is about 0.05%). Aluminum, as an important alloying element of this steel, affects the oxygen content in the steel. The requirements are extremely high, and deep deoxidation must be achieved. Otherwise, high-melting-point magnesium-aluminum spinel inclusions are likely to be produced during aluminum alloying, which not only affects the casting of molten steel, but also easily produces defects on the surface of the subsequent rolled steel strip.

SUS405 steel only relies on ferrosilicon for deoxidation, which not only increases the cost, but also increases the amount of slag, reduces the basicity of slag, and weakens the ability to remove inclusions. The use of silicon-aluminum composite deoxidation and reduction slag stripping can not only complete deep deoxidation, but also avoid pollution of molten steel by high melting point inclusions such as Al2O3 and MgO·A2O3.