UNS S31803 is a typical duplex stainless steel very similar to UNS S32205 except that it may have a bit lower content requirement of chromium, molybdenum and nitrogen. Generally, both UNS 31803 and S32205 can be called as “Duplex 2205” in practice.

1. Chemical Composition of UNS S31803

The Chemical Composition of S31803, %
Carbon	0-0.03
Chromium	21.00-23.00
Manganese	≤2.00
Silicon	≤1.00
Phosphorous	0-0.03
Sulphur	0-0.02
Nickel	4.50-6.50
Nitrogen	0.08-0.20
Molybdenum	2.50-3.50
Iron	Balance

2. Mechanical Properties of UNS S31803

Tensile Strength,min.	Yield Strength,min.	Elongation,min.	Hardness Brinell, max
Mpa	Mpa	%	HB
620	450	25	290

3. Physical Properties of UNS S31803

Density	Thermal Expansion	Modulus of Elasticity	Thermal Conductivity	Electrical Resistivity
g/cm3	K	Gpa	W/m.k	Ω.m
7.805	13.7*10-6	200	19.0	0.085*10-6

4. Product Forms and Standards

Duplex stainless steel UNS S31803 can be supplied in the following forms:

1. Plates, sheets & strips: ASTM A240;
2. Bars and shapes: ASTM A276, A479;
3. Seamless and weld pipe/ tubes: ASTM A789, A790, A928;
4. Wrought duplex pipe fittings: ASTM A815;
5. Forgings(flanges, fittings, valve parts): ASTM A182, ASTM A988.

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