At present, the price of this kind of stainless steel in the international market is generally between 19000-20000 yuan, and the price of this kind of stainless steel is still rising. If the upward trend continues,1February is expected to exceed 25,000 yuan per ton.
What are the advantages of dual-phase steel over austenitic stainless steel?
The yield strength of 1. is more than twice that of common austenitic stainless steels such as 304, 304L, 3 16 and 3 16L. , and has enough plasticity and toughness for molding. The wall thickness ratio of equipment parts made of duplex stainless steel is 3 16L, which can be reduced by 30-50%, which is beneficial to reduce the cost.
2. Under both dynamic and static loads, it has higher energy absorption capacity than austenitic stainless steel, which has obvious advantages for structural parts to deal with sudden accidents such as collision and explosion, and has practical application value.
3. High strength, remarkably improved intergranular corrosion resistance and chloride stress corrosion resistance, and excellent pitting corrosion resistance.
Austenitic stainless steel generally belongs to corrosion-resistant steel and is the most widely used steel. Among them, 18-8 stainless steel is the most representative, which has good mechanical properties and is convenient for processing, stamping and welding. It has excellent corrosion resistance and good heat resistance in oxidizing environment. However, it is particularly sensitive to the medium containing chloride ion (CL-) in the solution and prone to stress corrosion. 18-8 stainless steel can be divided into three grades according to the different carbon content in its chemical composition: low carbon grade with ordinary carbon content (Wc≤0. 15%).
According to the main chemical composition, it is divided into chromium stainless steel, chromium nickel stainless steel and chromium manganese nitrogen stainless steel. It can be divided into acid-resistant stainless steel and heat-resistant stainless steel according to performance characteristics; Usually classified according to metallographic structure. According to the metallographic structure, it can be divided into ferrite (F) stainless steel, martensite (M) stainless steel, austenite (A) stainless steel, austenite-ferrite (A-F) duplex stainless steel, austenite-martensite (A-M) duplex stainless steel and precipitation hardening (PH) stainless steel.