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Duplex/Super duplex stainless steel

Sunmire Steel has a large stock of 2205 stainless steel sheets from 3/16 "to 3" thick。The yield strength of 2205 is twice that of austenitic stainless steel, which allows designers to reduce weight when designing products, making this alloy more affordable than 316,317L。

3/16" 1/4" 5/16" 3/8" 1/2" 5/8" 3/4" 7/8" 1" 1 1/8" 1 1/4" 1 3/8" 1 1/2"
4.8mm 6.3mm 7.9mm 9.5mm 12.7mm 15.9mm 19mm 22.2mm 25.4mm 28.6mm 31.8mm 34.9mm 38.1mm
 
1 5/8" 1 3/4" 2" 2 1/4" 2 1/2" 2 3/4" 3" 3 1/4" 3 1/2" 4" 5" 6"
41.3mm 44.5mm 50.8mm 57.2mm 63.5mm 69.9mm 76.2mm 82.6mm 88.9mm 101.6mm 127mm 152.4mm

2205 alloy (UNS S32305/S31803) is a duplex stainless steel composed of 22% chromium, 3% molybdenum and 5-6% nickel-nitrogen alloy。It has high strength, good impact toughness and good integral and local resistance to strong corrosion。

Compared with 316L and 317L austenitic stainless steel, 2205 alloy has superior performance in spot corrosion and gap corrosion, it has high corrosion resistance, compared with austenite, its thermal expansion coefficient is lower, higher thermal conductivity。

It has twice the compressive strength compared to austenitic stainless steel, allows designers to reduce its weight and cost less than 316L and 317L。

General attributes

2205 duplex stainless steel is composed of 22% chromium,3% molybdenum and 5-6% nickel nitrogen duplex stainless steel。It has high strength, good impact toughness and good integral and local stress corrosion resistance。

Compared with 316L and 317L austenitic stainless steel,2205 alloy has superior performance in spot corrosion and gap corrosion, it has high corrosion resistance, compared with austenite, its thermal expansion coefficient is lower, higher thermal conductivity。

The yield strength of 2205 is twice that of austenitic stainless steel, which allows designers to reduce weight when designing products, making this alloy more affordable than 316,317L。

This alloy is particularly suitable for use in the -50°F/+600°F temperature range。Applications beyond this temperature range may also consider this alloy, but there are some limitations, especially when applied to welded structures。


Application field

  • Pressure vessels, high pressure storage tanks, high pressure pipelines, heat exchangers (chemical processing industry)。
  • Oil and gas pipeline, heat exchanger pipe fittings。
  • Sewage treatment system。
  • Pulp and paper industry classifiers, bleaching equipment, storage treatment systems。
  • Rotary shafts, press rollers, blades, impellers etc. in high strength corrosion resistant environment。
  • A cargo box on a ship or truck
  • Food processing equipment

标准

ASTM/ASME...........A240 UNS S32205/S31803
EURONORM...........1.4462 X2CrNiMoN 22.5.3
AFNOR...................Z3 CrNi 22.05 AZ
DIN.........................W. Nr 1.4462

Corrosion resistance

Uniform corrosion
Due to chromium content (22%), molybdenum (3%) and nitrogen content (0.18%), the corrosion resistance of 2205 is superior to 316L and 317L in most environments。

Local corrosion resistance
The content of chromium, molybdenum and nitrogen in 2205 makes it very resistant to spot and gap corrosion in oxidizing and acidic solutions。

Corrosion curve in sulfuric acid solution containing 2000ppm chloride 4 mpy (0.1 mm/yr)

Stress corrosion resistance
The duplex microstructure of stainless steel is helpful to improve the cracking resistance of stainless steel。

Chloride stress corrosion occurs in austenitic stainless steel at a certain temperature, tension, oxygen and chloride presence。Because these conditions are difficult to control, the use of 304L, 316L and 317L is limited in this respect。

Corrosion fatigue
2205 alloy has high corrosion fatigue strength due to its high strength and corrosion resistance。Processing equipment is susceptible to corrosive environments and loading cycles, and the 2205 features are ideal for such applications。

The critical corrosion temperature of 1M NaCl was measured by AvestaPolarit corrosion cell。

In 10% of FeCl3?Critical temperature of gap corrosion in 6H2O

Uniform corrosion in wet-treated phosphoric acid

Corrosion rate, IPY
等级 Solution A, 140 ° F Solution B, 120 ° F
2205 3.1 3.9
316L >200 >200
904L 47 6.3
Ingredients, wt %
P2O5 HCl HF H2SO4 Fe2O3 Al203 SiO2 CaO MgO
Sol A 54.0 0.06 1.1 4.1 0.27 0.17 0.10 0.20 0.70
Sol B 27.5 0.34 1.3 1.72 0.4 0.001 0.3 0.02

Stress cracking corrosion resistance

Boiling Wick Boiling
等级 42% MgCl2 Test 25% NaCl
2205 F P P
254 SMO ® F P P
Type 316L F F F
Type 317L F F F
Alloy 904L F P or F P or F
Alloy 20 F P P

(p= passed F= failed)

Chemical composition

Average value (weight %)

Carbon Chromium Nickel Molybdenum Nitrogen Others
0.020 22.1 5.6 3.1 0.18 S=0.001
PREN = [Cr%] = 3.3 [Mo%] = 16 [N%] ≥ 34

Mechanical properties

Mechanical properties at room temperature

ASTM A 240 Typical
Yield strength 0.2%, ksi 65 min. 74
Compressive strength, KSI 90 min. 105
Rate of extension, % 25 min. 30
硬度 32 max. 19

Mechanical properties at high temperature

Temperature ° F 122 212 392 572
Yield strength 0.2%, ksi 60 52 45 41
Compressive strength, KSI 96 90 83 81

Physical properties

Temperature ° F 68 212 392 572
密度 lb/in3 0.278
Modulus of elasticity psi x 106 27.6 26.1 25.4 24.9
Linear expansion (68 ° F - T) 10-6/°F 7.5 7.8 8.1
Coefficient of thermal conductivity Btu/h ft ° F 8.7 9.2 9.8 10.4
Heat capacity Btu/lb ft ° F 0.112 0.119 0.127 0.134
The resistivity Ω in 10 x-6 33.5 35.4 37.4 39.4

结构

The chemical analysis of 2205 duplex stainless steel plate is optimized to obtain a typical 50 a/ 50 g microstructure after solution annealing treatment at 1900°/1922°F (1040°/1080°C).

Chloride Pitting Resistance

The chemical composition of 2205 was subjected to solid melt annealing at 1900°/1922°F (1040°/1080°C) to obtain the ideal microstructure of 50 α / 50 γ 。

If the temperature of heat treatment is higher than 2000°F, it may result in an increase in ferrite composition。

Like other duplex stainless steels,2205 alloy is susceptible to intermetallic precipitation。The intermetallic phase precipitates between 1300°F and 1800°F, with the fastest precipitation rate at 1600°F。Therefore, we need to test 2205 to ensure that there is no intermetallic phase, and refer to ASTM A 923 for the test。

加工

Hot forming

We recommend that the forming should be carried out as far as possible below 600°F temperature。During the hot forming process, the whole workpiece should be heated as a whole in the temperature range of 1750°F to 2250°F, at which 2205 alloy is very soft。2205 alloy is prone to thermal tearing if the temperature is too high。Below this temperature, austenite breaks。Below 1700°F, intermetallic junctions form rapidly due to temperature and deformation。Immediately after the hot forming process, it should be annealed at a minimum temperature of 1900°F and quenched to restore its phase balance, toughness and corrosion resistance。Stress relief is not recommended, but if it must be done, the material should be annealed by solid fusion at a minimum of 1900°F, followed by rapid cooling and water quenching。

Cold forming

2205 alloy can be cut and cold formed。However, because of the high strength and hardness of 2205 alloy itself, it needs to be cold formed more than austenitic steel, but also because of its high strength, to fully consider the factor of rebound。

Heat treatment

The alloy 2205 should be annealed at a minimum temperature of 1900°F, followed by rapid cooling and water quenching。This treatment is used for solid melt annealing and stress relief。Stress relief treatments, if performed at temperatures below 1900°F, tend to result in the release of harmful metallic or nonmetallic phases。

Mechanical machinability

In high-speed machine tools, the feed rate and cutting speed of 2205 alloy are the same as those of 316L。If the charring knife is used, the cutting speed is reduced by about 20% compared with 316L, and the performance of the machine equipment and its components plays a key role in this。

焊接

2205 alloy has good weldability。The performance of 2205 alloy is to maintain the same corrosion resistance, strength and toughness of the welding metal and the thermal metamorphic part as the base metal。The welding of 2205 is not difficult, but the welding procedure needs to be designed so that after welding, good phase balance can be maintained and harmful metal phase or non-metal phase precipitation can be avoided。2205 可在以下设备中进行焊接: GTAW (TIG); GMAW (MIG); SMAW (“stick” electrode);SAW; FCW; and PAW.

2205 Code Plus Two is a registered trademark of AvestaPolarit, Inc。254 SMO and 654 SMO Yes A registered trademark of AvestaPolarit Stainless Steel Corporation。SAF 2304 is a registered trademark of Sandvik AB。

The technical information provided here reflects our best and most comprehensive knowledge at the time of compiling this information, but the content may change slightly as our research on corrosion grade products progresses。 We suggest you reconfirm the above information when you make an inquiry or place an order。In addition, every product has some special circumstances when it is used。The data provided herein are only descriptions of the products, which can only be regarded as our guarantee and commitment when our company makes written documents。