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NSSC’s Duplex Stainless Steel Perforated Metal

Duplex stainless steel can solve these problems!

For problems in the production of food/beverage products and pharmaceuticals



Want to reduce the replacement frequency of equipment used in food factories.



Want to lower the man-hours required to polish chemicals and pharmaceuticals.



Want to stabilize costs without price fluctuations.



Want to use environmentally friendly equipment.

Changing from conventional stainless steel to a duplex stainless steel Perforated Metal can solve any problems!

By replacing the strainer with a "duplex stainless steel" Perforated Metal made of a material that is stronger and more durable than conventional products, the frequency of equipment replacement can be reduced and the use of reinforcement materials can be reduced, resulting in cost savings.

What is duplex stainless steel ?

Duplex steel is different from double-layer steel. Duplex stainless steel has advantages of both austenitic and ferritic structure.
Duplex stainless steel is made by increasing the Cr content and decreasing the Ni content.

Features of Duplex stainless steel sanitary strainer

High Strength

Solves strength problem of SUS304・SUS316L wire mesh strainer‬‬‬‬
Duplex stainless steels have twice the strength and higher hardness properties than conventional stainless steels

  • Twice the strength (0.2% yield strength) enable to lead to lighter weight and thinner wall, also it has excellent springness.
  • High hardness and good abrasion resistance, it is hard to dent even if objects hit it.

High corrosion resistance

Excellent resistance to pitting corrosion and stress corrosion cracking‬‬‬‬
Duplex stainless steels have excellent resistance to pitting corrosion and stress corrosion cracking in a chloride environment

  • Longer equipment life
  • Reduction of life cycle costs of strainer.

Polishability

Excellent buffing and polishing properties‬‬‬‬
Compared to conventional stainless steel, buffing is easier and surface luster is more easily achieved.

  • Reduction of the man-hours for polishing

Lower thermal expansion

Less thermal expansion and contraction than SUS304‬‬‬‬
Low coefficient of linear expansion prevents expansion, contraction, and thermal deformation due to heating and cooling.

  • Mitigation of thermal deformation and thermal fatigue

Resource savings

Uses much smaller amounts of Ni and Mo.‬‬‬‬
Due to its low content of rare materials, this material is not easily affected by price fluctuations and more environmentally friendly than conventional stainless steels.

  • Less susceptible to raw material price fluctuations
  • Environmentally friendly materials

Cost reduction

Reduce cost by reducing weight

Product specifications

Applicable specification of Laser drilled Duplex Stainless Steel and Perforated Duplex Stainless Steel

①SUS821L1(NSSC 2120®)
Drilling
Method
Hole size
(mm)
Thickness
(mm)
pitch
(mm)
Max.
Open area
Mesh
(Equaivalent)
Max.Sheet
Size(mm)
Laserφ0.0350.5t3.5%#400900×1800
φ0.0455.0%#300
φ0.0756.5%#200
φ0.11010.0%#150
φ0.15514.0%#100
φ0.20017.0%#80
φ0.27019.0%#60
φ0.32022.0%#50
φ0.41022.0%#40
φ0.56025.0%#30
Perforatingφ0.700P1.519.7%#24500×500
φ0.800P1.622.7%#24
φ0.900P1.822.7%#20
φ1.000P222.7%#18

②SUS329J1 equaivalent(NSSC®2351)
Drilling
Method
Hole size
(mm)
Thickness
(mm)
pitch
(mm)
Max.
Open area
Mesh
(Equaivalent)
Max.Sheet
Size(mm)
Laserφ0.4100.8t22.0%#40900×1800
φ0.56025.0%#30
Perforatingφ0.80022.7%#24500×500
φ0.900P1.632.6%#20
φ1.000P1.540.3%#18

※The pattern of Laser screen is Random Straight
※The pattern of Perforated metal is 60 degree staggered.

Main chemical composition・Pitting Resistance Equivalent Number(PREN)

classificationCrNiMoMnNRare
metal*1
PREN*2
①SUS821L1
(NSSC2120®)
212-30.172325
②SUS329J1
equaivalent
(NSSC®2351)
235110.172930
SUS304188-10.042619
SUS316L18122.510.0232.526

●Compared to conventional stainless steel,Duplex Stainless Steel has a higher Cr,lower Ni,Lower Mo,higher N.
It is an eco-friendly material with low content of rare metals. ●NSSC 2110® and NSSC 2351® have a higher PREN than SUS 304 and SUS 316L,respectively.

*1 Sum total of rare metal=Cr%+Ni%+Mo%
*2 PREN=Cr%+3.3×Mo%+16×N%

Mechanical Properties

classification0.2%Yield
Strength
(N/㎟)
Tensil
Strength
(N/㎟)
Elongation
(%)
Hardness
HV
①SUS821L1
(NSSC2120®)
57079231256
②SUS329J1
equaivalent
(NSSC®2351)
61383029264
SUS30430065456170
SUS316L28156153143

●Compared to conventional stainless steel,

Physical properties

ClassificationDensity
g/㎤
Modulus of
longitudinal
elasticity
KN/㎟
Specific heat
KJ/kg/℃
Thermal
conductivity
w/m/℃
Coefficient of
linear
expansion
×10⁻⁶/℃
Magnetic
①SUS821L1
(NSSC2120®)
7.802000.516.013.7Yes
②SUS329J1
equaivalent
(NSSC®2351)
7.802000.515.213.1Yes
SUS3047.931930.516.317.3No
SUS316L7.981930.516.316.0No

●Compared to conventional stainless steel,

Precautions for welding duplex stainless steel

NSSC's Duplex stainless steel NSSC2120®(SUS821L1) and NSSC®(Equivalent to SUS329J1) have greatly been improved weldability and can be welded under the same conditions as SUS304.
Please note the following.

  • 1Use of specialized welding materials
    (diagram below) recommended
    Welding without welding material is also possible, but the characteristics of the weld must be checked beforehand.
  • 1Proper heat input control (Avoid Low heat input / High heat input and Spot welding. Interpass temperature below 100 degree C is required.)
  • 1Avoid using hydrogen as a shielding gas
  • 1Weld scale removal

Recommended welding materials

Steel typeCovered arc-welding electrodeTIG welding rodFlux cored wire electrode
NSSC2120®Similar metal (The lean duplex stainless steel)
Type 2209
Type2209Similar metal (The lean duplex stainless steel)
Type 2209
NSSC®2351Type2209Type2209Type2209

Dissimilar material welding of duplex stainless steel

SUS304 typeType2209,309LMo,309L
SUS316 typeType2209,309LMo

Reference example

Food factory large tank

Thickness3~8mm
Conventional stainless steelSUS304

Thickness2~6mm
Duplex stainless steelSUS821L1

By converting a large tank in a food factory to duplex stainless steel, we were able to reduce the plate thickness from 3 to 8 mm to 2 to 6 mm.
Steel weight has been reduced by 25% to achieve weight savings.

The crane used was downsized to reduce equipment costs.
Mobile sanitary tanks have also been downsized for improved transportability.

Food factory retort sterilization trays

Conventional stainless steelSUS304、aluminum resin

Duplex stainless steelSUS821L1

Replacing sterilization trays in food plants with duplex stainless steel can increase strength, reduce reinforcement, make trays lighter, and reduce processing costs.

Low thermal expansion makes it resistant to heat-induced deformation and distortion, extending the maintenance cycle and extending service life.

Press Release

Okutani developed a duplex stainless steel strainer for food and medical applications.
(Joint developed with NS Stainless Corporation)
Okutani has developed a perforated strainer made of Duplex stainless steel for production equipment for food and medical products in joint-development with NS Stainless Corporation