Zhejiang Guanyu Stainless Steel Tube Co., Ltd  
  Directory | Useful Tool | Sitemap | Contact US | Home

         

Stainless Steel

S31803 S32205 2205 vs 316L




Choose S31803/S32205 and 316L (Urea Grade) be the trial grade, compare each property of duplex stainless steel and austenitic stainless steel. So as to, based on acquaintance of 316L steel, understanding of mechanical properties and corrosion properties of duplex steel.

Since chromium can naturally form a thin protective film of passivation on the surface of stainless steel, stainless steel has corrosion resistance. Molybdenum makes this passivation film stronger and allows it to be rapidly regenerated when the passivation film is destroyed by chloride. An increase in the molybdenum content increases the pitting corrosion resistance and crevice corrosion resistance of the stainless steel.

316L (2% to 3% Mo) is the most widely used molybdenum-containing stainless steel. It is designated as a tank, pipe and heat exchanger material for food processing and pharmaceutical production. Increased molybdenum content enhances resistance to chloride in the air, so Type 316 can be used as a material of choice for offshore and coastal buildings. 316L is used to cover the Canary Wharf building in London and the tallest building in the world - the outer layer of the Petronas Tower in Kuala Lumpur, Malaysia.

S32205 Duplex stainless steel (3.0% to 4.0% Mo) has high strength and excellent resistance to chloride stress corrosion cracking. Multipurpose stainless steel, originally used as a fluid flow tube in the oil and gas industry, is now more used in the chemical processing and petrochemical industries and as a digester in the pulp and paper industry.

ASTM A789 ASTM A790 S32205 Stainless Steel Pipe Composition %:

C Si Mn P S Cr Mo Ni N Cu
max. 0,03 max. 1,00 max. 2,00 max. 0,030 max. 0,020 22,00 - 23,00 3,0 - 3,5 4,5 - 6,50 0,14-0,20 -

C Si Mn P S Cr Mo Ni N Cu
max. 0,035 max. 1,00 max. 2,00 max. 0,045 max. 0,040 16,00 - 18,00 2,0 - 3,0 10.0 - 14.0 - -

2.Mechanical Properties (Tubing and Piping) Table - 2

Grade Heat Treatment Tensile Strength (Mpa) Yield Strength (Mpa) δ%
S31803(SAF2205) Solution Annealing 1060 ℃
water quenching
655 485 25
TP 316L(UG)
(S31603)
Solution Annealing 1050 ℃
water quenching
485 170 35

According to the result, the tensile strength of S32205 is higher than 316L, yield strength near to twice.

3.Macrostructure (Low Power Structure) Table - 3

Grade Central looseness
(Grade)
General looseness (Grade) Square Looseness (Grade)
S31803(SAF2205) 0.5 0.5 0
TP 316L(UG) 0.5 0.5 0

4.Clearness
According to ASTM E45, Test result as below: Table - 4

Grade A       B       C      D
thin heavy thin heavy thin heavy thin heavy
S31803(SAF2205) 0 0 0.5 0 0 0 1.0 0
0 0 1.0 0 0 0 1.0 0
TP 316L (UG)
(S31603)
0 0 0.5 0.5 0 0 0.5 0
0 0 0.5 0 0 0 1.0 0

According to Table 3 and Table 4, we found that the macrostructure and clearness of S32205/S31803 and TP 316L is similar.

5.Metallographic Structure Test Result Table - 5
Heat No. Number Ferrite (%)

VOD TB02-761
Forging Bar 1 45
2 46
Hot Rolled Perforation Pipes 3 47
4 46

Table 9 dates show the metallographic structure of this heat number steel reasonable. Prove that the steelmaking technology control the chemical analysis very strictly.

6.Intergranular Corrosion Resistance Property
In order to test the intergranular corrosion resistance property of 316L(UG), according to Stamicarbon standard of 316L (UG), do the compare test of S31803/S32205 and 316L(UG). All the trial is solution annealing, Test 5 cycles in the 65 ±0.2% HNO3 boiling solution,every cycle is 48 hours, result show as below:

Table 6
Grade Cycle, μm/48h Average
μm/48h
1 2 3 4 5
S31803(SAF2205) 0.8767 0.8110 1.42732 1.35864 1.119585 1.11865
TP 316L (UG)
(S31603)
1.88508 0.90842 0.831655 1.71449 1.70169 1.408267

Huey Test is a general way for test corrosion resistance stainless steel for Urea. The weight loss per unit area is measured after each of five 48-hour boils in 65 percent nitric acid. The test results are calculated to and reported as the average corrosive rate of the five boils in inches per month (ipm) corrosion rates. The test is used to determine the suitability of a material for nitric acid service. Since most of the weight loss is due to intergranular attach, the Huey test is commonly used as an indication of the resistance of a stainless steel to intergranular corrosion.

Huey test is very strictly, if the chemical analysis control not very well, steelmaking quality is bad, it is very hard to pass the test. 316L(UG) request 5 cycles average corrosive rate less than ≤3.3 μm/48h。According to the test result,S32205/S31803 not only meet the request,But meet the request of 25-22-2(2RE69)austenitic stainless steel average corrosive rate≤1.5 μm/48h, better than 316L(UG),special from cycle 5,S32205/S31803 average corrosive rate far lower than 316L (UG),show the S32205/S31803 chemical analysis is well and steelmaking quality is good.

Stainless Steel Tubing
Visual Testing
Stainless Steel Tube PMI Testing
100% PMI Testing
Stainless Steel Tube Hydraustatic Testing
Hydraustatic Testing

Stainless Steel Tube in Plywood Cases
Stainless Steel Tube Package
Plywood Cases Package

Stainless Steel Tube in Plywood Cases With Iron Frame
Iron Frame Plywood Case Package

Related References:
Stainless Steel " L" "H" Grade
Difference Between 304H and 347H
Difference Between 304 304L and 321
Difference Between ASTM A213 and ASTM A269
Difference Between ASTM A213 and ASTM A312
304 304L 304LN 304H Stainless Steel Tubing and Pipe
Difference Between Duplex Steel S31803 / S32205 and 316L
Metallographic Test - Metallography Testing
Metallographic Test Report
Stress Corrosion Cracking (SCC)
Chloride Stress Corrosion Cracking
Stainless Steel Corrosion
Corrosion of Piping
Corrosion Process
Surface Coatings for Corrosion
Corrosion Resistant Material
Bi- Metallic Corrosion.Galvanic Corrosion
Intergranular Corrosion
Intergranular Corrosion of Stainless Steel Tubes
Corrosion Resistant Stainless Steel Tube
Corrosion Resistance of Stainless Steel Tubes
Seawater Resistance of Stainless Steel Tubes
Corrosion Mechanism in Stainless Steel Tube
ASTM A262 Intergranular Corrosion Test IGC
ASTM E112 Standard Test Methods for Determining Average Grain Size
Methods of minimizing chloride stress corrosion cracking

Stainless Steel Tubing, Nickel Alloy Tubing, Brass Alloy Tubing, Copper Nickel Pipe Material Grades


TubingChina.com All Rights Reserved

Directory | Standard | Heat | Heat Exchanger | Temperature | Pressure | Corrosion | Hardness | Surface | Properties | Select Stainless Steel | Contact US

Useful Tools:

Stainless Steel Weight Calculator
Metals Weight Calculator
Nickel Alloy Weight Calculator
Copper Brass Alloy Weight Calculator
Copper Brass Alloy Sheet Plate Weight Calculator
Sheet Plate Weight Calculator
Hardness Conversion Calculator
Hardness Conversion Chart
Rockwell Brinell Vickers Shore Hardness Conversion Chart
Conversion Calculator
Length Weight Temperature Volume Pressure Calculater
Pipe Working Pressure Calculator
Pressure Conversion Converter
Round Bar Size Calculator
Gauge Sizes
Sheet Metal Gauge
Pipe Schedule
Nominal Pipe Size
ANSI Pipe Chart
Inch to mm Chart
Stainless Steel Pipe Sizes
Stainless Steel Tubing Sizes Chart
Stainless Steel L H Grade
Stainless Steel Density
Conversion of Stainless Steel
Nickel Alloy Grades Comparison Material Grade Chart Carbon Steel
Structural Steel Comparison Chart



Main Products:

BA Tube | AP Tube
Condenser Tubes Tubing
Stainless Steel Reheater Tube Superheater Tubes
Stainless Steel U bend Tube
Nickel Alloy U bend Tubes
Copper Alloy U Bend Tubes
Heat Exchanger Tube
Super Duplex Pipe
Nickel Alloy Tube
Brass Alloy Tubing
Copper Nickel Alloys Tubes
Stainless Steel Hollow Tube
Stainless Steel Oval Tubing
Stainless Steel Square Tubing
Stainless Steel Rectangular Tubing
Stainless Steel Capillary Tube
Duplex Stainless Steel Pipe
Seamless Stainless Steel Tubing
Corrugated Stainless Steel Tubing
Stainless Steel Twisted Tube
Polishing Stainless Steel Tubing
Stainless Steel Aircraft Tube
Stainless Steel Hydraulic Tubing
Stainless Steel Instrumentation Tubing
Stainless Steel Angle Iron Bar
Stainless Steel Mechanical Tube
Bright Annealing Stainless Tube
Heat resistant Stainless Steel
Stainless Steel Welded Pipe
Extruded Serrated Finned Tubes Integral Finned Tubes / Extruded Aluminum Finned Tubes
Brass Alloys Copper Nickel Alloy Integral Low Finned Tubes
HFW High Frequency Welded Helical Spiral Serrated Finned Tubes
Corrosion Resistant Stainless Steel
Corrosion Resistance Stainless Steel

Stainless Steel Tubing Pipe

304 Stainless Steel Pipe
304L Stainless Steel Pipe
304H Stainless Steel Pipe
304/304L Stainless Steel Tubing
309S Stainless Steel Pipe
310S Stainless Steel Pipe
316L Stainless Steel Tubing
316Ti Stainless Steel Tube
317L Stainless Steel Pipe
321 321H Stainless Steel
347 347H Stainless Steel
904L N08094 Seamless Tubes
17-4 PH 630 UNS S17400 Stainless Steel
253MA S30815 Stainless Steel Tube
S31254 254 SMO Pipe
S31803 Stainless Steel
2205 Duplex Pipe Tubing
S32101 Stainless Steel
S32304 Stainless Steel
2507 Super Duplex Pipe
S32750 Super Duplex Pipe
S32760 Super Duplex Steel
1.4462 Stainless Steel Pipe
ASTM A213 | ASTM A269
ASTM A312 | ASTM A511
ASTM A789 | ASTM A790
ASTM B161 / ASME SB 161 | ASTM B111
EN 10216-5
ASTM A789 ASME SA 789 S31803 S32205 S32101 S32750 S32760 S32304 S31500 S31260 Seamless Tubes
EN 10216-5 1.4462 1.4362 1.4162 1.4410 1.4501 Seamless Tubes
Nickel Alloy Tubing:

UNS N08020 Alloy 20 Tubing
UNS N02200 Alloy 200 Tube
UNS N02201 Alloy 201 Pipe
UNS N04400 Monel 400 Tubing
N06600 Inconel 600 Tube
N06601 Inconel 601 Tubing
N06625 Inconel 625 Tubes
N08800 Incoloy 800 Tube
N08810 Incoloy 800H Tube
N08811 Incoloy 800HT Tubing
UNS N08825 Incoloy 825 Pipe
ASTM B622 N10276 C276 Tubing
ASTM B622 N06022 Hastelloy C-22 Alloy Tubes
C28000 Brass Seamless Tubes C44300 Brass Seamless Tubes
C68700 Brass Seamless Tubes
C70600 Copper Nickel Tubes
C71500 Copper Nickel Tubes
DIN 2391 Seamless Precision Steel Tubes
EN 10305-1 E215 E235 E355 Seamless Precision Steel Tube Tubing Tubes
DIN 2393 St28 St34.2 St37.2 St44.2 St52.3 Welded Precision Steel Tubes
EN 10305-2 E195 E235 E355 Welded Cold Drawn Precision Steel Tube