Stainless steel thick plate is a kind of corrosion-resistant high-alloy steel. Its surface is very beautiful and does not require surface treatment such as electroplating or painting. Therefore, many machinery factories usually do not do any paint treatment to show that it is stainless steel, and black materials (the so-called black materials are called ordinary steel) must undergo rust prevention treatment.
Stainless steel thick plate is an important application material in many fields. Its products have excellent performance in all aspects and long service life. It has been widely used in machinery manufacturing, construction engineering, kitchenware manufacturing, rail vehicles and other industries. With the development of economy, people’s pursuit of quality of life is getting higher and higher, and the use of stainless steel, which is closely related to people’s lives, has also greatly increased. Nowadays, the technology of laser cutting stainless steel thick plates has become more and more mature, and will gradually replace traditional cutting technology. In order to cut high-quality stainless steel thick plates, it is necessary to fully understand the cutting process elements.
Compared with ordinary austenitic stainless steel, the main difference between stainless steel thick plate and ordinary austenitic stainless steel is that the chromium content of duplex stainless steel is higher, reaching 20-28%, and the molybdenum content is higher, reaching about 5%. The nickel content is low, about 9%, and the nitrogen content is about 0.05-0.5%.
The low nickel content and high strength of thick duplex stainless steel plates (thin parts can be used) are cost-effective. Therefore, they are widely used in pipeline systems for offshore oil and gas operations, and they are becoming more and more popular in pipeline and pressure vessel operations in petrochemical operations.
What is the thickness of the stainless steel plate? The thickness of ordinary stainless steel plates is usually between 1-16 mm. Classified by thickness, it can be divided into ultra-thin plate, thin plate, medium plate, thick plate and extra-thick plate.
Ultra-thin strip with a thickness of 0.05-0.2 mm; thin plate: thickness of 0.2-3 mm; medium plate: thickness of 3-20 mm; stainless steel thick plate: thickness of 20-60 mm; ultra-thick plate: thickness of more than 60 mm.
Duplex stainless steel thick plates refer to stainless steels with ferrite and austenite each accounting for about 50%, and the secondary phase content usually needs to reach 30%. When the carbon content is low, the chromium content is 18% to 28%, and the nickel content is 3% to 10%. Some steels also contain alloying elements such as molybdenum, copper, niobium, titanium and nitrogen.