Released a high-strength sanitary strainer that solves the stainless steel strength problem of screens used in the filtration process during food production and reduces costs!

Duplex stainless steel sanitary strainers are made of duplex stainless steel (SUS821L1 (NSSC 2120®), Equivalent to SUS329J1 (NSSC®2351) ) instead of conventional stainless steel (SUS304, SUS316L) provide approx. twice strength and wear resistance, and improve Pitting Resistance Equivalent, and also the price is stable due to its low content of rare metals.
We have experiences to contribute 10 - 30 % of cost reduction by switching to duplex stainless steel.

NSSC,NSSC 2120 are registered of NIPPON STEEL Stainless Steel Corporation.
＜NIPPON STEEL Stainless Steel Corporation＞https://stainless.nipponsteel.com/news/2022/20220607.php

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Duplex stainless steel can solve these problems!

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

Changing the strainer material from conventional stainless steel to duplex stainless steel solves all problems!

Replacing sanitary strainers with duplex stainless steel, which ts stronger and more durable than conventional stainless steel,will reduce the frequency of equipment replacement and the use of reinforcement materials,thereby reducing costs.

Features of Duplex stainless steel sanitary strainer

High Strength

High corrosion resistance

Polishability

Lower thermal expansion

Resource savings

Cost reduction

Reduce cost by reducing weight

Joint development by NS Stainless Corporation and Okutani Ltd.

Prevents breakage and reduces replacement frequency
Magnetic properties enable detection of foreign objects in the event of breakage.

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 (equivalent)	Max.Sheet Size(mm)
Laser	φ0.035	0.5t		3.5%	#400	900×1800
	φ0.045			5.0%	#300
	φ0.075			6.5%	#200
	φ0.110			10.0%	#150
	φ0.155			14.0%	#100
	φ0.200			17.0%	#80
	φ0.270			19.0%	#60
	φ0.320			22.0%	#50
	φ0.410			22.0%	#40
	φ0.560			25.0%	#30
Perforating	φ0.700		P1.5	19.7%	#24	500×500
	φ0.800		P1.6	22.7%	#24
	φ0.900		P1.8	22.7%	#20
	φ1.000		P2	22.7%	#18

②SUS329J1 equivalent(NSSC^®2351)

Drilling Method	Hole size (mm)	Thickness (mm)	pitch (mm)	Max. Open area	Mesh (equivalent)	Max.Sheet Size(mm)
Laser	φ0.410	0.8t		22.0%	#40	900×1800
	φ0.560			25.0%	#30
Perforating	φ0.800			22.7%	#24	500×500
	φ0.900		P1.6	32.6%	#20
	φ1.000		P1.5	40.3%	#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)

classification	Cr	Ni	Mo	Mn	N	Rare metal*1	PREN*2
①SUS821L1 (NSSC 2120®)	21	2	-	3	0.17	23	25
②SUS329J1 equivalent (NSSC®2351)	23	5	1	1	0.17	29	30
SUS304	18	8	-	1	0.04	26	19
SUS316L	18	12	2.5	1	0.02	32.5	26

●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

classification	0.2％Yield Strength (N/㎟)	Tensil Strength (N/㎟)	Elongation (％)	Hardness HV
①SUS821L1 (NSSC 2120®)	570	792	31	256
②SUS329J1 equivalent (NSSC®2351)	613	830	29	264
SUS304	300	654	56	170
SUS316L	281	561	53	143

●Compared to conventional stainless steel,

• ✓Twice the strength(0.2% YS)→Thin wall and light weight are possible,also it`s excellent springiness.
• ✓High Hardness→It has good abrasion resistance and is not easily dented when hit by objects.

Physical properties

●Compared to conventional stainless steel,

• ✓Magnetic→Foreign substances can be detected and removed by magnets.
• ✓Small coefficient of linear expansion→Expansion,contraction,and themal deformation due to heating or cooling are also small.

Precautions for welding duplex stainless steel

NSSC's Duplex stainless steel NSSC 2120®(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.

Recommended welding materials

Steel type	Covered arc-welding electrode	TIG welding rod	Flux cored wire electrode
NSSC 2120®	Similar metal (The lean duplex stainless steel) Type 2209	Type2209	Similar metal (The lean duplex stainless steel) Type 2209
NSSC®2351	Type2209	Type2209	Type2209

Dissimilar material welding of duplex stainless steel

SUS304 type	Type2209,309LMo,309L
SUS316 type	Type2209,309LMo

Reference example

Food factory large tank

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

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.

Product catalog

●For more details, please see the PDF file for a larger version.
PDF file (454KB)

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