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{"title":"Duplex UNS31803 Corrosion Resistant Stainless Steel Pipe for High-Strength","imgUrl":"https:\/\/img.chinax.com\/nimg\/f9\/32\/128301399937b50a243d60c1592f-200x200-1\/duplex_uns31803_corrosion_resistant_stainless_steel_pipe_for_high_strength.jpg","attrs":[]}
{"title":"EN 10208-2; L415MB spiral welded pipes in Pipe Size :508 NACE MR0175 PSL2","imgUrl":"https:\/\/img.chinax.com\/nimg\/3b\/97\/04a3f7946569ef9f75e6112d0f34-200x200-1\/en_10208_2_3b_l415mb_spiral_welded_pipes_in_pipe_size_3a508_nace_mr0175_psl2_production_year_3a2018.jpg","attrs":{"Brand Name":"Best","Model Number":"1\/2'' -48''","Certification":"API \/CE \/ ISO \/TUV","Place of Origin":"China"}}
{"title":"DIN 17172:1978 StE 415.7 TM, StE 445.7TM, StE 48 Steel tubes for pipeline for","imgUrl":"https:\/\/img.chinax.com\/nimg\/4e\/69\/30fcfca220c033d6644bfa216af9-200x200-1\/din_17172_3a1978_ste_415_7_tm_2c_ste_445_7tm_2c_ste_48_steel_tubes_for_pipeline_for_transport_of_combustible_liquids_and_gases.jpg","attrs":{"Brand Name":"Best","Model Number":"1\/2'' -48''","Certification":"API \/CE \/ ISO \/TUV","Place of Origin":"China"}}
{"title":"DIN 17172:1978 StE 360.7 TM, StE 385.7 TM, Steel tubes for pipeline for","imgUrl":"https:\/\/img.chinax.com\/nimg\/7a\/47\/d2b6f16b13aaaaae1a2739f5773d-200x200-1\/din_17172_3a1978_ste_360_7_tm_2c_ste_385_7_tm_2c_steel_tubes_for_pipeline_for_transport_of_combustible_liquids_and_gases.jpg","attrs":{"Brand Name":"Best","Model Number":"1\/2'' -48''","Certification":"API \/CE \/ ISO \/TUV","Place of Origin":"China"}}
{"title":"DIN 17172:1978StE 290.7 TM, StE 320.7 TM Steel tubes for pipeline for transport","imgUrl":"https:\/\/img.chinax.com\/nimg\/ba\/4b\/60bdc204de5ac26b8c6013d3c797-200x200-1\/din_17172_3a1978ste_290_7_tm_2c_ste_320_7_tm_steel_tubes_for_pipeline_for_transport_of_combustible_liquids_and_gases.jpg","attrs":{"Brand Name":"Best","Model Number":"1\/2'' -48''","Certification":"API \/CE \/ ISO \/TUV","Place of Origin":"China"}}
{"title":"DIN 17172:1978 DIN 17172:1972 StE 290.7, StE 360 Steel tubes for pipeline for","imgUrl":"https:\/\/img.chinax.com\/nimg\/1f\/ea\/56e59d8e9f246637c0e4eb5a33f4-200x200-1\/din_17172_3a1978_din_17172_3a1972_ste_290_7_2c_ste_360_steel_tubes_for_pipeline_for_transport_of_combustible_liquids_and_gases.jpg","attrs":{"Brand Name":"Best","Model Number":"1\/2'' -48''","Certification":"API \/CE \/ ISO \/TUV","Place of Origin":"China"}}
{"title":"DIN 17120:1984 Welded circular tubes of non-alloy steels for steel constructions","imgUrl":"https:\/\/img.chinax.com\/nimg\/4b\/22\/d866d8dd4d8ffb122e01b8a15ebb-200x200-1\/din_17120_3a1984_welded_circular_tubes_of_non_alloy_steels_for_steel_constructions.jpg","attrs":{"Brand Name":"Best","Model Number":"1\/2'' -48''","Certification":"API \/CE \/ ISO \/TUV","Place of Origin":"China"}}
UNS S31803 is the standard designation for the common duplex stainless steel often known as 2205. This material combines roughly equal amounts of austenitic and ferritic microstructures, providing higher strength and superior resistance to stress corrosion cracking compared to austenitic grades like 304 or 316.
Chemical Composition
Element
Composition Range (wt%)
Chromium (Cr)
21.0 – 23.0 %
Nickel (Ni)
4.5 – 6.5 %
Molybdenum (Mo)
2.5 – 3.5 %
Manganese (Mn)
≤ 2.0 %
Silicon (Si)
≤ 1.0 %
Nitrogen (N)
0.08 – 0.20 %
Carbon (C)
≤ 0.03 %
Phosphorus (P)
≤ 0.03 %
Sulfur (S)
≤ 0.02 %
Iron (Fe)
Balance
Key Element Functions
Chromium (≈22%): Provides strong general corrosion and oxidation resistance through stable passive film formation
Molybdenum (≈3%): Greatly improves resistance to pitting and crevice corrosion in chloride-containing environments
Nickel (5–6%): Stabilizes the austenitic phase for better toughness and weldability
Nitrogen (0.08–0.20%): Provides solution strengthening and improves localized corrosion resistance
Low Carbon (≤0.03%): Reduces carbide precipitation risk during welding and maintains corrosion resistance
Performance Benefits
Higher strength than 304/316 stainless steel, allowing thinner wall thickness for equivalent pressure ratings
Superior resistance to stress corrosion cracking in chloride-bearing environments
Ideal for demanding applications in oil & gas, marine, chemical processing, and heat exchangers
Quality Assurance
When evaluating materials for your project:
Verify exact composition against recognized standards (ASTM A790/A789 or EN/ISO equivalents)
Request mill test certificates showing actual heat analysis
Consider UNS S32205 for applications requiring tighter composition specifications
UNS S31803 duplex stainless steel pipes feature a balanced ferrite-austenite microstructure with optimized chromium, nickel, molybdenum, and nitrogen content, delivering exceptional mechanical strength and corrosion performance for demanding service conditions.
Best Alloy Engineering Alloy Pipe as s a reference point for excellence in the manufacture and distribution of fittings, piping, bends, forged flanges , clad products and specialties for the upstream, midstream and downstream sectors of oil & gas, thermal and nuclear power generation.
The C...
Best Alloy Engineering Alloy Pipe as s a reference point for excellence in the manufacture and distribution of fittings, piping, bends, forged flanges , clad products and specialties for the upstream, midstream and downstream sectors of oil & gas, thermal and nuclear power generation.
The C...
