Views: 0 Author: Site Editor Publish Time: 2021-07-17 Origin: Site
Stainless steel belt can be divided right into 3 classifications according to its metallographic framework, namely, austenitic stainless-steel, ferritic stainless-steel and martensitic stainless steel belt
1. Warm therapy of austenitic stainless steel belt.
Austenitic stainless-steel is a sort of chromium-nickel alloy steel. The content of its primary alloying components is greater than 6% nickel and also 16% to 26% chromium. In order to acquire unique homes of steel, molybdenum, titanium, niobium and various other aspects are included.
The objective of the annealing treatment is to recrystallize the processed steel framework as well as make it fully softened to promote reprocessing; on the other hand, it is to solid-dissolve carbides in the austenite framework to enhance rust resistance. The annealing temperature variety is normally 1000-1150 ° C, and then it is swiftly cooled down at this temperature, and the austenite in the state of carbon is maintained at typical temperature by means of rapid air conditioning (if the cooling rate is sluggish, carbides will be precipitated). The air conditioning technique relies on the product and density of the steel strip. It can be water-cooled, spray-cooled, shielded gas splashed air conditioning, as well as air-cooled.
2. Warmth therapy of ferrite stainless copper
Ferritic stainless-steel is alloy steel dominated by chromium (consisting of 11%-28% of chromium), primarily low-carbon, with extremely little nickel.
The heat therapy of this kind of steel is likewise annealing, the purpose of which is to eliminate stress and anxiety, soften, and rise ductility. Annealing temperature level array is 650-850 ℃, cooling down in the air, water or controlled atmosphere. For high chromium steel, it ought to be kept in mind that embrittlement will certainly occur throughout slow cooling in the variety of 400 to 500 ℃, so it is needed to stay clear of remaining in this temperature level array as long as feasible.
3. Warmth therapy of martensitic stainless-steel
Martensitic stainless steel belt also makes use of chromium as the main alloying aspect (including 10% to 18% chromium), as well as carbon is in the series of 0.08% -1.2%. The majority of them do not include nickel, and some contain a percentage of nickel (2.5%). The warm treatment of martensitic stainless-steel typically has the adhering to processes:
After annealing and also hot rolling, hardening takes place due to bad air conditioning. In order to soften and also enhance ductility, annealing is required. The annealing temperature level is 850-920 ℃, the heater is cooled down to 600 ℃, and afterwards air-cooled is called total annealing, which is usually carried out in a bell heating system. The annealing temperature is 620 ～ 780 ℃, and then air-cooled is called procedure annealing, which is normally performed in a continuous furnace.
Quenching-Martensitic stainless steel belt can get really high solidity after heat quenching. Its quenching temperature level is 925-1065 ℃, oil quenching or air cooling. In order to remove the internal stress after quenching, it is usually necessary to execute tension alleviation annealing and tempering. Steel strips and also steel plates are rarely dealt with by doing this.
4. Heat treatment of duplex stainless-steel
The duplex stainless-steel, which regulates the proportion of austenite and ferrite in a certain proportion, is a brand-new steel quality established to improve deterioration resistance and get higher toughness. The nickel content of duplex stainless-steel has to do with 5%, and also it includes high chromium (about 25%).
Duplex stainless-steel has high mechanical residential or commercial properties, excellent sturdiness as well as weldability, but bad hot and cold workability. As a result of the high chromium material of duplex stainless-steel, if it is kept in the temperature level variety of 600-800 ℃ for a very long time, stages are prone to show up, which decreases the strength and also rust resistance of the steel.