Duplex Stainless 2205 is a nitrogen-enhanced duplex used in applications requiring high strength and excellent corrosion resistance. It is designed to combine improved resistance to stress corrosion cracking, pitting and crevice corrosion. Duplex 2205 provides nearly double the corrosion resistance typical in other austenitic stainless steels.

UNS NICKEL MATERIAL GRADES
Nickel grade	UNS	Werkstoff	DIN
Duplex Stainless Steel	UNS S31803	1.4462	X2CrNiMoN22-5-3
Duplex Stainless Steel	UNS S32205	1.4462	X2CrNiMoN22-5-3

Butt weld fittings Application
Butt weld fittings Uses	Architecture and construction Aerospace Nuclear Power Fertilizers Valve & Pumps Petrochemical Motor industry Food and drink Electronics Transport and traffic Pulp and paper industry Medicine Energy industry Chemicals industry Nickel Alloy in Pulp and Paper
Butt weld fittings Order & Packing Information
	Min. Order: 10 Pieces (or please enquire for your customized order) Trade Terms: FOB, CIF Payment Terms: L/C, T/T Packing: as per requirement Place of Origin:JIANGSU, China Means of Transport: Land, Ocean Delivery Date: one or two week Package: in wooden crate with plastic caps on each end.

More useful information

• Duplex  stainless steels have a mixed microstructure of austenite and ferrite, the aim usually being to produce a 50/50 mix, although in commercial alloys the ratio may be 40/60. Duplex stainless steels have roughly twice the strength compared to austenitic stainless steels and also improved resistance to localized corrosion, particularly pitting, crevice corrosion and stress corrosion cracking. They are characterized by high chromium (19–32%) and molybdenum (up to 5%) and lower nickel contents than austenitic stainless steels.

The properties of duplex stainless steels are achieved with an overall lower alloy content than similar-performing super-austenitic grades, making their use cost-effective for many applications. Duplex grades are characterized into groups based on their alloy content and corrosion resistance.

• Lean duplex refers to grades such as UNS S32101 (LDX 2101), S32304, and S32003.
• Standard duplex is 22% chromium with UNS S31803/S32205 known as 2205 being the most widely used.
• Super duplex is by definition a duplex stainless steel with a pitting corrosion equivalent (PRE) > 40, where PRE = %Cr + 3.3x(%Mo + 0.5x%W) + 16x%N. Usually super duplex grades have 25% chromium or more and some common examples are S32760 (Zeron 100 via Rolled Alloys), S32750 (2507) and S32550 (Ferralium),.
• Hyper duplex refers to duplex grades with a PRE > 48 and at the moment only UNS S32707 and S33207 are available on the market.

Comparison of standardized steels

EN-standard Steel no. k.h.s DIN	EN-standard Steel name	SAE grade	UNS
		440A	S44002
1.4112	X90CrMoV18	440B	S44003
1.4125	X105CrMo17	440C	S44004
		440F	S44020
1.4016	X6Cr17	430	S43000
1.4408	G-X 6 CrNiMo 18-10	316
1.4512	X6CrTi12	409	S40900
		410	S41000
1.4310	X10CrNi18-8	301	S30100
1.4318	X2CrNiN18-7	301LN
1.4307	X2CrNi18-9	304L	S30403
1.4306	X2CrNi19-11	304L	S30403
1.4311	X2CrNiN18-10	304LN	S30453
1.4301	X5CrNi18-10	304	S30400
1.4948	X6CrNi18-11	304H	S30409
1.4303	X5CrNi18-12	305	S30500
	X5CrNi30-9	312
1.4541	X6CrNiTi18-10	321	S32100
1.4878	X12CrNiTi18-9	321H	S32109
1.4404	X2CrNiMo17-12-2	316L	S31603
1.4401	X5CrNiMo17-12-2	316	S31600
1.4406	X2CrNiMoN17-12-2	316LN	S31653
1.4432	X2CrNiMo17-12-3	316L	S31603
1.4435	X2CrNiMo18-14-3	316L	S31603
1.4436	X3CrNiMo17-13-3	316	S31600
1.4571	X6CrNiMoTi17-12-2	316Ti	S31635
1.4429	X2CrNiMoN17-13-3	316LN	S31653
1.4438	X2CrNiMo18-15-4	317L	S31703
1.4362	X2CrNi23-4	2304	S32304
1.4462	X2CrNiMoN22-5-3	2205	S31803/S32205
1.4539	X1NiCrMoCu25-20-5	904L	N08904
1.4529	X1NiCrMoCuN25-20-7		N08926
1.4547	X1CrNiMoCuN20-18-7	254SMO	S31254