Duplex 2205 Round Bars

Duplex 2205 hot rolled round bar is a high strength stainless bar used for shafts, valve parts, bolting and marine fittings.

16 to 125 mm Duplex stainless steel Made to order

HOT ROLLED ROUND BARS

Duplex 2205 hot rolled round bar

Duplex 2205 hot rolled round bar is a stainless bar rolled in the standard duplex grade, UNS S32205, in diameters from 16 to 125 mm. The steel holds roughly equal amounts of ferrite and austenite, and that mixed structure gives it about twice the yield strength of 304 or 316. ASTM A479 sets 655 MPa tensile strength and 450 MPa yield for the grade solution annealed. Chromium near 22 percent, molybdenum around 3 percent and added nitrogen raise its resistance to pitting and to chloride stress corrosion cracking, which is the failure austenitic bar suffers in warm chloride. Lean duplex grades leave out most of the molybdenum, and 2507 super duplex carries more chromium, molybdenum and nitrogen for a heavier chloride load. Laxcon Steels rolls the bar to order.

Bar leaves the mill solution annealed and water quenched, which returns the chromium and molybdenum to solution and settles the balance between the two phases. The grade takes no hardening from heat treatment, so its strength comes from the structure itself. Service stops at about 300 degrees Celsius, above which the ferrite turns brittle. The bar cuts harder than 304 and work hardens quickly, so machining wants a rigid setup, positive rake and a firm feed. Welding holds the heat input inside a set band and uses a filler richer in nickel, so the weld metal does not cool to almost all ferrite. Common parts are pump and valve shafts, seawater and desalination components, offshore bolting, and flanges forged from the bar.

Composition limits in weight percent are carbon 0.03 maximum, manganese 2.0 maximum, sulphur 0.02 maximum, phosphorus 0.03 maximum, silicon 1.0 maximum, chromium 22.0 to 23.0, nickel 4.5 to 6.5, molybdenum 3.0 to 3.5 and nitrogen 0.14 to 0.2.

SPECIFICATION

Duplex 2205 hot rolled round bar supply conditions

Size range: 16 mm - 125 mm (5/8" - 5")
Length: Up to 8 metres
Tolerances: ASTM A484, EN10060
Heat treatment: Solution annealing and water quenching
Grade: 2205 / S32205 / F60 (2205, S32205, S31803, F60)
Family: Duplex stainless steel
Supply: Made to order in this grade; every published size of the form

Composition of Duplex 2205

Element	Symbol	Minimum %	Maximum %
Carbon	C		0.03
Manganese	Mn		2.0
Sulphur	S		0.02
Phosphorus	P		0.03
Silicon	Si		1.0
Chromium	Cr	22.0	23.0
Nickel	Ni	4.5	6.5
Molybdenum	Mo	3.0	3.5
Nitrogen	N	0.14	0.2

Composition, weight percent, balance iron. From the Laxcon Steels grade reference.

Equivalents of Duplex 2205

Standard	Designation
UNS	S32205
EN number	1.4462
JIS	SUS 329J3L

Equivalence means nearest counterpart, not identity: each standards body sets its own composition window, so the limits of the standard named on the order govern.

Pitting resistance

The pitting resistance equivalent number of Duplex 2205 runs from 34.1 at the specified minimum chromium, molybdenum and nitrogen to 37.8 at the maxima, computed as PREN = Cr + 3.3Mo + 16N (International Molybdenum Association). It ranks resistance to chloride pitting against other austenitic and duplex grades and nothing else: it does not predict crevice corrosion, stress corrosion cracking or service life. The pitting resistance reference carries the full table.

Governing standards

EN 10088-3: Stainless steels: technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products for general purposes. Composition, heat treatment condition and mechanical properties per grade.
EN 10060: Hot rolled round steel bars for general purposes: dimensions and tolerances on shape and dimensions.
ASTM A276/A276M: Stainless steel bars and shapes: composition, condition, mechanical properties and finish designations for hot-finished and cold-finished bar.
ASTM A484/A484M: General requirements for stainless steel bars, billets and forgings: permissible variations in dimensions, straightness, weight and length, and the test and marking requirements every bar order inherits.
ASTM A479/A479M: Stainless steel bars and shapes for use in boilers and other pressure vessels: the bar specification a pressure-part drawing calls for.
ASTM A314: Stainless steel billets and bars for forging.
NACE MR0175 / ISO 15156: Materials for use in H2S-containing environments in oil and gas production: the sour-service limits on hardness and condition.
ASTM A182/A182M: Forged or rolled alloy and stainless steel pipe flanges, forged fittings, valves and parts for high-temperature service: the F51 and F53 duplex forging grades.
EN 10204: Metallic products, types of inspection documents: the 2.2 test report and the 3.1 and 3.2 inspection certificates a purchase order can call for.

Weight per metre

Diameter (mm)	kg per metre	Metres per tonne
16	1.59	629.5
17	1.79	557.6
18	2.01	497.4
19	2.24	446.4
20	2.48	402.9
21	2.74	365.4
22	3.00	333.0
23.2	3.34	299.4
24	3.57	279.8
25	3.88	257.9
26	4.19	238.4
27	4.52	221.1
28	4.86	205.6
30	5.58	179.1
32	6.35	157.4
34	7.17	139.4
36	8.04	124.4
37	8.49	117.7
38	8.96	111.6
40	9.93	100.7
42	10.95	91.4
45	12.57	79.6
47	13.71	73.0
48	14.30	69.9
50	15.51	64.5
53	17.43	57.4
56	19.46	51.4
57.5	20.52	48.7
60	22.34	44.8
63	24.63	40.6
66	27.03	37.0
67.5	28.27	35.4
70	30.40	32.9
73.5	33.52	29.8
75	34.90	28.7
77.5	37.27	26.8
80	39.71	25.2
83	42.75	23.4
85	44.83	22.3
88	48.05	20.8
90	50.26	19.9
93	53.67	18.6
95	56.00	17.9
98	59.59	16.8
100	62.05	16.1
105	68.41	14.6
106	69.72	14.3
110	75.08	13.3
115	82.06	12.2
120	89.35	11.2
125	96.95	10.3

Density 7.90 g/cm³, diameter squared x 0.006205. Sizes are the published range at the nominal diameters shown.

Ordering Duplex 2205 hot rolled round bar

An enquiry for this grade in this form states the grade and the standard it is ordered to, EN 10088-3 or ASTM A479, the solution annealed condition, the diameter and the tolerance class to ASTM A484 or EN 10060, the finish as black, spot ground or fully ground, the cut length within 8 metres, the quantity, the certificate type to EN 10204, and any ultrasonic test, PMI check or NACE MR0175 requirement.