Overview
S31500 material is a duplex (austenitic-ferritic) stainless steel
with characters as High resistance to stress corrosion cracking
(SCC) in chloride, bearing environments, Good resistance to general
corrosion and pitting, High mechanical strength, roughly twice the
proof strength of austenitic grades, Good resistance to erosion
corrosion and corrosion fatigue, Physical properties that present
design advantages, Good weldability
Characterized by the following properties:
High resistance to stress corrosion cracking (SCC) in
chloride-bearing environments
Good resistance to general corrosion and pitting
High mechanical strength – roughly twice the proof strength of
austenitic grades
Good resistance to erosion corrosion and corrosion fatigue
Physical properties that present design advantages
Good weldability
Application
Oil refineries
Pulp and Paper industry
Chemical industry
Food industry
Petrochemical plants
Safety panels
Chemical Composition
| C | Si | Mn | P | S | Cr | Ni | Mo | N |
| 0.03 | 1.4-2.0 | 1.2-2.0 | 0.03 | 0.03 | 18.0-19.0 | 4.5-5.2 | 2.5-3.0 | 0.05-0.10 |
Mechanical Properties
| Tensile Strength,Mpa | Yield Strength,Mpa | Elongation% | Hardness,HB |
| 630 min | 440 min | 30 min | 290 max |
Corrosion Resistance
Duplex steel UNS S31500 has impressive properties, making it a
sought-after material among multiple industries. It is known for
its corrosion resistance and high strength, and toughness. This
makes the alloy suitable for projects that require superior
corrosion resistance, like sea water piping or marine use, chemical
industry and food processing equipment. The combination of good
strength, excellent corrosion resistance and high toughness, even
at low temperatures, make duplex steel UNS S31500 an ideal choice
for demanding applications since it provides more cost-effective
solutions than other alloys.
Heat Resistance
Duplex steel UNS S31500 is known for its superior heat resistance
properties compared to conventional stainless steel alloys. Due to
its two-phase microstructure, the alloy shows excellent oxidation
and corrosion resistance – even in harsh environments. In addition,
it has a higher chromium content which helps it withstand elevated
temperatures without losing ductility or toughness. This makes
Duplex steel UNS S31500 an ideal choice for applications such as
wall panels and linings in chemical processing units, marine
equipment and pressure vessels operating at extreme temperatures.
Heat Treatment
This alloy is resistant to pitting and crevice corrosion and
retains its strength when exposed to temperatures up to 600°C. To
achieve these amazing performance levels, S31500 must be heat
treated carefully to maintain the balance between its ferrite and
austenitic structures. During heat treatment, the alloy may undergo
several cycles of heating and cooling to reach the desired level of
toughness and corrosion resistance. Once it has been heat treated,
duplex steel UNS S31500 can be used for components that require
long-term exposure to corrosive environments or extreme temperature
fluctuations.
Package Process
1.with plastic cap to protect both ends
2.weaving bag wrapped outside the pipe
3.then pack into wooden case.
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