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JM Hardware® Lean Duplex Stainless Steel (PREN range: 24–30)- UNS No. S32101, S82011, S32202, S32304 Fastener

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At JM Hardware®, we are a trusted Lean Duplex Stainless Steel (SS) fastener manufacturer, specializing in producing high-quality fasteners that deliver exceptional strength, corrosion resistance, and cost-efficiency. Lean Duplex Stainless Steel fasteners are widely recognized for their superior performance in environments where conventional stainless steel or carbon steel may fail. Our tailored manufacturing solutions and diverse product range make us the preferred partner for B2B buyers across industries such as construction, marine, chemical processing, and oil & gas.

Email: jminfo@jm-industry.com

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JM Hardware® Lean Duplex Stainless Steel (PREN range: 24–30)- UNS No. S32101, S82011, S32202, S32304 Fastener

description1

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Description

Typically grade EN 1.4362, have been developed more recently for less demanding applications, particularly in the building and construction industry. Their corrosion resistance is closer to that of the standard austenitic grade EN 1.4401 (with a plus on resistance to stress corrosion cracking) and their mechanical properties are higher. This can be a great advantage when strength is important. This is the case in bridges, pressure vessels or tie bars.

It possesses properties such as high mechanical strength, similar to that of other duplex steels, and good corrosion resistance. Compared to 300 series stainless steels, Lean duplex stainless provides superior strength and greater chloride stress corrosion cracking resistance.

The use of manganese ensures proper ferrite-austenite phase balance, while allowing a reduction in nickel content. As a result, Lean duplex stainless is priced competitively with 304L and 316L stainless steels. Due to its relatively low alloying content, it is less prone to precipitation of intermetallic phases than other duplex steels.

AS ISO 17781:2022 / ISO 17781:2022

Annex A — Chemical compositions of duplex stainless steels

Composition range given in mass percent

Type 20Cr Group A Duplex

24,0 ≤ PREN < 28,0

UNS No.	EN No.	C	Cr	Ni	Mo	N	Mn	Cu	W
S32001	1.4482	0,03	19,5 to 21,5	1,0 to 3,0	0,6	0,05 to 0,17	4,0 to 6,0	1,0	c
S32101	1.4162ᵈ	0,04	21,0 to 22,0	1,35 to 1,7	0,1 to 0,8	0,20 to 0,25	4,0 to 6,0	0,1 to 0,8	c
S32202	1.4062ᵈ	0,03	21,5 to 24,0	1,0 to 2,8	0,45	0,18 to 0,26	2,00	c	c
S82011	—	0,03	20,5 to 23,5	1,0 to 2,0	0,1 to 1,0	0,15 to 0,27	2,0 to 3,0	0,5	c
—	1.4655	0,03	22,0 to 24,0	3,5 to 5,5	0,1 to 0,6	0,05 to 0,20	2,00	1,0 to 3,0	c

Type 20Cr Group B Duplex

28,0 ≤ PREN < 30,0

UNS No.	EN No.	C	Cr	Ni	Mo	N	Mn	Cu	W
S32003	—	0,03	19,5 to 22,5	3,0 to 4,0	1,5 to 2,0	0,14 to 0,20	2,00	c	c
S32304	1.4362	0,03	21,5 to 24,5	3,0 to 5,5	0,05 to 0,6	0,05 to 0,20	2,5	0,05 to 0,60	c
S31500	1.4424	0,03	18,0 to 19,0	4,25 to 5,25	2,5 to 3,0	0,05 to 0,1	c	c	—
S81921	—	0,03	19,0 to 22,0	2,0 to 4,0	1,0 to 2,0	0,14 to 0,20	2,0 to 4,0	c	c

Duplex & Super Duplex Material Selection Chart

Lean Duplex → 2205 → 2507 → 27Cr Duplex

Material Level	Typical Grade	EN No.	ISO 17781 Group	PREN Range	Typical Chemistry Focus	ISO 17781 Corrosion Test	Typical Environment	Fastener Application
Lean Duplex	S32101 / S32304	1.4162 / 1.4362	Type 20Cr	24–30	Lower Ni / Mo, cost-efficient	ASTM A1084, 18–30°C × 24h	Mild–moderate chloride, structural & general industrial service	Bolts, nuts, threaded rods for less severe corrosive environments
Duplex 2205	S31803 / S32205	1.4462	Type 22Cr	30–40	Cr ≈ 22%, Mo ≈ 3%, N ≈ 0.15%	ASTM G48 Method A, 25°C × 24h	Oil & gas, chemical plants, process equipment, marine service	Stud bolts, bolts, nuts, anchor bolts, equipment fasteners
Super Duplex 2507	S32750	1.4410	Type 25Cr	40–48	Cr 24–26%, Ni 6–8%, Mo 3–5%, N 0.24–0.32%	ASTM G48 Method A, 50°C × 24h	High chloride, seawater, offshore, subsea	Offshore bolting, subsea fasteners, seawater system bolts, flange bolting
Super Duplex	S32760	1.4501	Type 25Cr	40–48	Cr 24–26%, Mo 3–4%, N 0.20–0.30%, Cu + W	ASTM G48 Method A, 50°C × 24h	Aggressive seawater, offshore, chemical & sour-service related applications	Stud bolts, heavy hex bolts/nuts, valve & pump fasteners, offshore equipment
27Cr High-Alloy Duplex	S33207 / S32707	1.4485 / 1.4658	Type 27Cr	48–55	Higher Cr, Mo and N; very high pitting resistance	ASTM G48 Method A, 60°C × 24h	Extremely aggressive chloride / seawater / high-corrosion process environments	Critical offshore, subsea, chemical and special-project fasteners

Forms of Lean Duplex SS Fastener Available at JM Hardware®

	Product name	Standard No.	Size
BOLT	HEX HEAD BOLT	ANSI/ASME B18.2.1, DIN933, DIN931	1/4”-4”, M5-M100
	SOCKET CAP SCREW	ANSI/ASME B18.3, DIN912, DIN7991, DIN913/916	1/4”-4”, M5-M100
	FLANGE BOLT	ANSI/ASME B18.2.3.4M-2001, DIN 6921	1/2”-4”, M10-M100
	EYE BOLT	ANSI/ASME, DIN standard	1/2”-4”, M10-M100
	OTHER BOLT	U BOLT, T BOLT, J BOLT, SQURE HEAD BOLT, SHOULDER BOLT, AND NON-STANDARD BOLT ACCORDING TO CUSTOMER NEEDS.
STUD	THREADED ROD/BAR	ANSI/ASME, DIN975/DIN976	3/8”-4”, M5-M100
STUD	DOUBLE ENDS STUDS	ANSI/ASME, DIN STANDARD	3/8”-4”, M5-M100
NUT	HEX NUT	ANSI/ASME B18.2.2, DIN934	1/4”-4”, M5-M100
	HEAVY HEX NUT	ANSI/ASME B18.2.2, DIN standard	1/2”-4”, M12-M100
	NYLON LOCK NUT	ANSI/ASME B18.16.6-2008, DIN 985,DIN982	1/2”-4”, M12-M100
	FLANGE NUT	ANSI/ASME, DIN6923	1/2”-4”, M12-M100
	COUPLING NUT/LONG NUT	ANSI/ASME, DIN STANDARD	1/2”-4”, M12-M100
	SQUARE NUT	ANSI/ASME, DIN 557	1/2”-4”, M12-M100
	HEX DOOMD CAP NUT	ANSI/ASME, DIN1587	1/2”-4”, M12-M100
	WING NUT	ANSI/ASME, DIN315	1/2”-4”, M12-M100
WASHER	FLAT WASHER	ANSI/ASME B18.22.1, DIN125	3/8”-4”, M6-M100
WASHER	SPRING WASHER	ANSI/ASME B18.21.1, DIN127	3/8”-4”, M6-M100

Testing before shipping

Step 1: Size Detection

Step 2: GO Gauge and NO-GO Gauge Detection

Step 3: Chemical Composition Detection

Step 4: Mechanical Properties Test

Step 5: The product is carefully packaged

Application

Duplex stainless steels are usually selected for their high mechanical properties and good to very high corrosion resistance (particularly to stress corrosion cracking).

Oil and Gas:
a wide range of equipment: flowlines, manifolds, risers, pumps, valves, etc.
Pulp and Paper:
digesters, pressure vessels, liquor tanks, etc.
Chemical engineering:
pressure vessels, heat exchangers, condensers, distillation columns, agitators, marine chemical tankers, etc.
Water:
desalination plants, large tanks for water storage, waste water treatment
renewable energy: Biogas tanks
Mobility: tramcars and bus frames, tank trucks, iron ore wagons
Engineering: pumps, valves, fittings, springs, etc.

Technical Data

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