Description
ASTM A790 / A789 UNS S31803 DUPLEX PIPE TUBE BRIEF INTRODUCTION
ASTM A790 Uns s31803 / ASTM A789 Uns S31803 duplex pipe tube is a stainless steel tube with good chloride stress resistance, Uns s31803 contains 21% Chrome 4.5% nickel and 2.5% molybdenum.
ASTM A790 Uns S31803 duplex pipe tube is duplex stainless steel pipe and a medium alloy duplex stainless steel with good chloride stress resistance. Medium alloy type – the representative grade is UNS S31803 (22Cr-5Ni-3Mo-0.15N); S31803 duplex steel pipe is in three kinds of dual phase steel (2205 duplex stainless steel pipe, 2507 duplex stainless steel pipe, S31803 duplex stainless steel seamless tube) is the most widely used.
Name ASTM A790 / A789 UNS S31803 Duplex pipe tube Material: Stainless steel
Properties: Good chloride resistance stress Representative grade: UNS S31803
ASTM A790 Is Standard for Seamless and Welded Ferritic-Austenitic Stainless Steel Pipe
Scope of application
1.1x00a0;This specification2 covers seamless and straight-seam welded ferritic/austenitic steel pipe intended for general corrosive service, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.
1.2x00a0;Optional supplementary requirements are provided for pipe when a greater degree of testing is desired. These supplementary requirements call for additional tests to be made and, when desired, one or more of these may be specified in the order.
1.3x00a0;Appendix X1 of this specification lists the dimensions of welded and seamless stainless steel pipe as shown in ANSI B36.19. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification.
1.4x00a0;The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. The inch-pound units shall apply unless the M designation of this specification is specified in the order.
NOTE 1:x00a0;The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as nominal diameter, size, and nominal size.
ASTM A790 UNS S31803 Pipe & tube is a duplex stainless steel. 22% chromium duplex ( austenitic/ferritic ) steel ( type 2205 / UNS S32205 ) with moderate to high strength and good resistance to common corrosion/stress, corrosion/cracking.
The alloy of ASTM A790 UNS S31803 Pipe & tube is resistant to chloride environments and sulfide stress corrosion and is approximately twice as strong as standard austenitic stainless steels. This alloy can be successfully used as a replacement for 300 series austenitic stainless steels when higher mechanical strength/lower weight is required. The F51 is easy to weld with many standard arc welding equipment, but is not recommended for oxy-ethylene block welding due to the potential for carburization of the weld metal.
ASTM A790 UNS S31803 Pipe & tube Executive Standard
Main components: carbon (C)≤0.03, manganese (Mn)≤1.2, nickel (Ni) 6.0～8.0, silicon (Si)≤0.8, chromium (Cr) 24.0～26.0, copper (Cu) ≤0.5, molybdenum (Mo) )3.0～5.0, Nitrogen (N) 0.24～0.32
Physical Properties: 2205 Duplex Steel Density: 7.98g/cm3, Melting Point: 1300-1390 ℃, Magnetic Properties: None
Heat treatment: heat preservation between 1000-1050 ℃ for 1-2 hours, rapid air cooling or water cooling.
ASTM A790 UNS S31803 Pipe & tube Mechanical properties: Tensile strength: σb≥795Mpa, solid solution yield strength σb≥550Mpa: Elongation: δ≥15%, hardness ≤310 (HB)
ASTM A790 UNS S31803 PIPE & TUBE (foreign name:UNS S31803 stainless steel pipe) is an ultra-low carbon duplex stainless acid-resistant steel with excellent resistance to pitting and crevice corrosion. At the same time, nitrogen is a strong element that forms and stabilizes austenite. Even if it is welded or heated at high temperature, it can ensure that a certain amount of austenite exists in the structure. Single-phase ferrite. The two-phase ratio is not sensitive to changes in heating temperature.
ASTM A789 Is Standard for Seamless and Welded Ferritic / Austenitic Stainless Steel Tubing
Scope of application
1.1x00a0;This specification2 covers grades of average wall thickness, or, if specified on the order, minimum wall thickness, of stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.
1.2x00a0;The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Within the text, the SI units are shown in brackets. The inch-pound units shall apply unless the M designation of this specification is specified in the order.
ASTM A790 UNS S31803 duplex pipe tube products scope
- ASTM A790 UNS S31803 Duplex stainless steel pipe
- ASTM A790 UNS S31803 Duplex pipe seamless
- ASTM A790 UNS S31803 Duplex tube seamless
- ASTM A790 UNS S31803 Duplex pipe welded / welding
- ASTM A790 UNS S31803 Duplex tube welded / welding
- ASTM A789 UNS S31803 Duplex pipe welded / welding
- ASTM A789 UNS S31803 Duplex tube welded / welding
- 31803 Duplex pipe fittings
- 31803 Duplex pipe elbow
- 31803 Duplex pipe reducer
- 31803 Duplex pipe tee
- 31803 Duplex pipe cap
- 31803 Duplex pipe flange
ASTM A790 / A789 Uns S31803 duplex pipe tube chemical composition
C≦0.030;Si≦1.00;Mn≦2.00;P≦0.030;S：0.020;Ni:4.50~6.50;Cr:21.00~23.00;Mo:2.50~3.50;N:0.08~0.20
ASTM A790 Uns S31803 duplex pipe tube features
PREN value 32 to 33
The corrosion resistance of the medium alloy type UNS S31803 is between AISI 316L and 6% Mo+N austenitic stainless steel.
Yield strength is about 2 times stronger than 18-8 austenitic stainless steel.
ASTM A790 / A789 Uns S31803 duplex pipe tube application
- Neutral Chloride Environment
- Refining Industry
- Petrochemical and Chemical Industry
- Chemical Industry Conveying Pipeline
- Oil & Gas Industry
- Pulp and Paper Industry
- Fertilizer Industry
- Urea Industry
- Phosphate Fertilizer Industry
- Seawater Environment
- Energy and Environmental Protection Industry
- Light Industry And food industry
- food and pharmaceutical industry equipment
- high-strength structural parts
