24 July 2021 Duplex Stainless Steel
DIN 1.4462 Duplex Stainless Steel Bar
1.4462 Duplex stainless steel is a German grade duplex stainless steel consisting of 21% chromium, 2.5% molybdenum and 4.5% nickel-nitrogen alloy. It has high strength, good impact toughness and good overall and local resistance to stress corrosion. S31803 duplex stainless steel yield strength is twice that of austenitic stainless steel, this feature allows designers to reduce the weight of the product design, so that this alloy is more expensive than the 316,317L price. This alloy is especially suitable for use in the -50 ° F / + 600 ° F temperature range. Applications beyond this temperature range may also consider this alloy, but with some limitations, especially when applied to welded structures.
2.S31803 duplex stainless steel compared with austenitic stainless steel, it is twice its compressive strength, compared with the 316L and 317L, designers can reduce their weight. The 2205 alloy is especially suitable for use in the -50 ° F / + 600 ° F temperature range and can be used for lower temperatures under severe restrictions (especially for welded construction).
Chemical Composition:
- C≤0.030
- Mn≤2.00
- Si ≦ 1.00
- P ≦ 0.030
- S ≦ 0.020
- Cr 22.0 ~ 23.0
- Ni 4.5 ~ 6.5
- Mo3.0 ~ 3.5
- N0.14 ~ 0.20 (austenite-ferrite type)
1.4462 duplex stainless steel applications:
Pressure vessels, high pressure storage tanks, high pressure pipes, heat exchangers (chemical processing industry).
· Oil and gas pipelines, heat exchanger pipe fittings.
Sewage treatment system.
Pulp and paper industry classifier, bleaching equipment, storage and handling system.
High-strength corrosion-resistant environment under the rotating shaft, press roll, leaves, impeller and so on.
Ships or truck cargo boxes
Food processing equipment
1.4462 duplex stainless steel standard:
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S31803 duplex stainless steel corrosion resistance:
Even corrosion
The corrosion resistance of 2205 is superior to 316L and 317L in most environments due to chromium content (22%), molybdenum (3%) and nitrogen content (0.18%).
Local anti-corrosion
1.4462 Duplex stainless steels contain chromium, molybdenum and nitrogen in oxidizing and acidic solutions that are highly resistant to pitting and crevice corrosion.
Anti-stress corrosion
The duplex structure of stainless steel helps to improve the resistance to stress corrosion cracking of stainless steel. In a certain temperature, under the conditions of tension, oxygen and chloride, chloride stress corrosion occurs in austenitic stainless steel. As these conditions are not easily controlled, the use of 304L, 316L and 317L is limited in this regard.
Anti-corrosion fatigue
1.4462 Duplex stainless steel high strength and corrosion resistance to high corrosion resistance fatigue strength. The processing equipment is susceptible to corrosive environments and loading cycles, and 1.4462 duplex stainless steel is well suited for such applications.
Structure
1.4462 Duplex Stainless Steel Chemical Composition The ideal microstructure 50 α / 50 γ is obtained after a solution anneal of 1900 ° / 1922 ° F (1040 ° / 1080 ° C). If the heat treatment temperature is higher than 2000 ° F, may lead to an increase in ferrite composition. Like other duplex stainless steels, 1.4462 is susceptible to intermetallic phase precipitation. The intermetallic phase precipitates between 1300 ° F and 1800 ° F and precipitates fastest at 1600 ° F. Therefore, we need to test 1.4462 duplex stainless steel to ensure that no intermetallic phase, the test reference ASTM A 923.
S31803 duplex stainless steel processing
Thermoforming
We recommend forming should be done below 600 ° F. During thermoforming, the entire workpiece should be heated as a whole, in the temperature range of 1750 ° F to 2250 ° F, and the 2205 alloy is very soft at this temperature. If the temperature is too high, 2205 alloy easy to hot tear. Below this temperature austenite breaks. Below 1700 ° F, intermetallic phases quickly form due to temperature and strain. Immediately after thermoforming is completed, it is subjected to solid solution annealing at a minimum temperature of 1900 ° F and quenched to restore its phase balance, toughness and corrosion resistance. We do not recommend stress relief, but if this is necessary, the material should be solution annealed at a minimum temperature of 1900 ° F and then rapidly cooled for water quenching.
Cold forming
1.4462 Duplex stainless steel for cutting and cold forming. However, due to its high strength and hardness, the 2205 alloy requires more cold forming than austenitic steel, and because of its high strength, it must take full account of the rebound factor.
1.4462 Duplex stainless steel heat treatment
S31803 duplex stainless steel should be annealed at a temperature of 1900 ° F minimum, then rapidly cooled for water quenching. This treatment applies to solid solution annealing and stress relieving. Strain relief treatment, such as at temperatures below 1900 ° F, tends to result in the precipitation of unwanted metal or non-metal phases.
Mechanical machinability
On high-speed machines, the S31803 duplex stainless steel has the same feedrate and cutting speed as the 316L. With carbonized knives, the cutting speed is reduced by about 20% compared to 316L, where the performance of the machine and its components plays a key role.
Welding
1.4462 duplex stainless steel weldability is very good. 1.4462 The properties to be achieved with duplex stainless steels remain the same corrosion resistance, strength and toughness as the base metal for both the weld metal and the thermal deterioration. 1.4462 Duplex stainless steel is not difficult to weld, but its welding procedure needs to be designed so that after soldering it maintains a good phase balance and prevents the precipitation of unwanted metal phases or non-metal phases. S31803 duplex stainless steel can be welded in the following devices: GTAW (TIG); GMAW (MIG); SMAW ("stick" electrode); SAW; FCW; and paw
Performance: The main components: 22Cr-5.3Ni-3.2Mo-0.16N; National standards: NAS 329J3L, UNS S32205 / S31803, DIN / EN 1.4462, ASTM A240, ASME SA-240; Mechanical properties: Tensile strength: 640Mpa; Elongation: δ≥25%; Typical conditions: 20% dilute sulfuric acid, 60 ℃ below, the annual corrosion rate <0.1mm; Supporting wire: ER2209.