Duplex Steel Bars

Our integrated manufacturing edge gives us the ability to produce steel in a variety of finishes, surface options and profiles

PREN 31 - 35 1.4462, 1.4410, 2205 ASTM A 182, ASTM A 276, ASTM A 240

OVERVIEW

Product Description

Duplex stainless steels bars have enormous hardness, making them the first choice for applications that need high strength, such as in the oil and gas industry. Duplex stainless steels are called “duplex” because they have a two-phase microstructure consisting of grains of Ferrite and Austenite stainless steel. This structure provides a unique set of benefits. Duplex 1.4462 round bar is particularly notable for its excellent properties.

Duplex steel is about twice as strong as regular austenitic or ferritic stainless steel. With higher chromium content, it is corrosion-resistant and significantly has better toughness and ductility than ferritic grades. Super duplex and other duplex grades offer enhanced performance for demanding applications. As a top duplex stainless steel manufacturer in India, we remain extremely particular about the physical and mechanical properties of our bars.

Composition limits, PREN and the ASTM, EN and UNS names for each grade are in the duplex grade family. What a PREN figure does and does not guarantee is set out in the PREN reference. The two-phase structure, the lean, standard and super duplex classifications and the service conditions that call for duplex over an austenitic grade are explained in the duplex stainless steel guide.

Duplex stainless steel bars produced by Laxcon Steels

SPECIFICATION

Supply Conditions

Strength: Duplex stainless steels are about twice as strong as regular austenitic or ferritic stainless steel.
Corrosion resistance: As with all stainless steels, corrosion resistance depends mostly on the composition of the stainless steel. The composition of this steel makes it better at resisting corrosion.
Toughness and ductility: Duplex stainless steel has significantly better toughness and ductility than ferritic grades.

Applications

Structural Design Components
Storage and Exchange Equipment (High Pressure, Saline applications)
Heat Exchanger
Aerospace, Pulp and Paper Industry
Weight per metre for every listed size: metal weight calculator

PREN Values

Steel grade	PREN
1.4307 (austenitic)	18
1.4404 (austenitic)	24
1.4462	31
2205	35

Mechanical Properties

Grade No.	Yield Strength (Rp 0.2%) (Min)	UTS (Mpa)(Min)	UTS (Mpa)(Max)	% Elongation (Min)	Hardness (BHN) (Max)
1.4462	450	650	880	25	270
UNS S31803	448	620		25	290
UNS S32205	450	655		25	290
1.4362	400	600	830	25	260
1.4460	450	620	880	20	260

Chemical Composition

Standard	Grade	C %	Si %	Mn %	P %	S %	Cr %	Mo %	Ni(MAX) %	Cu %	N2(MAX) %
ASTM A 182	F-51	0.03	1	2	0.03	0.02	21-23	2.5-3.5	4.5-6.5		0.08-0.2
ASTM A 182	F-60	0.03	1	2	0.03	0.02	22-23	3.0-3.5	4.5-6.5		0.14-0.2
ASTM A 182	F-53	0.03	0.8	1.2	0.035	0.02	24-26	3-5	6.0-8.0	0.5	0.24-0.32
ASTM A 276	UNS S32205	0.03	1	2	0.03	0.02	22-23	3.0-3.5	4.5-6.5		0.14-0.2
ASTM A 276	UNS S31803	0.03	1	2	0.03	0.02	21-23	2.5-3.5	4.5-6.5		0.08-0.20
ASTM A 240	UNS S32750	0.03	0.8	1.2	0.035	0.02	24-26	3-5	6.0-8.0	0.5	0.24-0.32
DIN EN 10088-3	1.4462	0.03	1	2	0.035	0.015	21-23	2.5-3.5	4.5-6.5		0.1-0.22
DIN EN 10088-3	1.4460	0.05	1	2	0.035	0.03	25-28	1.3-2.0	4.5-6.5		0.05-0.2
EN 10095	1.4821	0.1-0.2	0.8-1.5	2	0.04	0.015	24.5-26.5		3.5-5.5		0.11
DIN EN 10088-3	1.4410	0.03	1	2	0.035	0.015	24-26	3.0-4.5	6.0-8.0		0.24-0.35
EN 10028-7	1.4362	0.03	1.0	2.0	0.035	0.015	22-24.5	0.1-0.6	3.5-5.5	0.1-0.6	0.05-0.2

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.
ASTM A276/A276M: Stainless steel bars and shapes: composition, condition, mechanical properties and finish designations for hot-finished and cold-finished bar.
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 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 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.
ASTM A240/A240M: Chromium and chromium-nickel stainless steel plate, sheet and strip: the composition tables the duplex grades are usually quoted from.
NACE MR0175 / ISO 15156: Materials for use in H2S-containing environments in oil and gas production: the sour-service limits on hardness and condition.
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.

Duplex against 316 and against super duplex

Against 316, the standard duplex grade 2205 (1.4462, UNS S32205) has roughly twice the minimum yield strength (450 MPa against 205 MPa in the bar specifications), a higher pitting resistance equivalent (about 35 against about 25) and better resistance to chloride stress corrosion cracking, at a lower nickel content. It is therefore the grade for chloride service where a thinner section saves weight or where 316 has pitted. Its limits are temperature: duplex is not used above about 300 degrees Celsius or below about minus 50, because the ferrite phase embrittles at both ends.

Super duplex 2507 (1.4410, UNS S32750) raises chromium, molybdenum and nitrogen to a PREN above 40 for seawater and the most severe chloride service; lean duplex grades such as 2304 lower the molybdenum for a price closer to 304 where strength rather than corrosion drives the choice. Composition limits, PREN and the equivalent designations for the whole family are in the duplex grade family.

Frequently Asked Questions

Which duplex and super-duplex grades are documented?

The duplex and super-duplex tables on this page cover UNS S31803, UNS S32205, UNS S32750, 1.4462, 1.4460, 1.4410 and 1.4362, with ASTM and EN grade references shown alongside their chemistry or mechanical properties.

How does duplex stainless steel compare with austenitic stainless steel?

Duplex stainless steel is approximately twice as strong as regular austenitic or ferritic stainless steel. Grade selection still depends on the required corrosion resistance, toughness and design standard.

Where are duplex stainless steels commonly specified?

Published applications for duplex stainless steel include structural components, high-pressure or saline storage and exchange equipment, heat exchangers, aerospace, and pulp and paper equipment.

How can duplex stainless steel bars be packed and traced?

Laxcon packs duplex stainless steel bars in standard bundles of 500 to 1,000 kg with HDPE or LDPE wrapping and two lifting slings. ISPM 15 wooden boxes and fibre-tube packing are available, and every bundle is marked with heat number, grade, size, and net and gross weight.

What should an RFQ for duplex stainless steel bars include?

An enquiry for duplex stainless steel bars is quotable when it states the grade, governing standard, metric size or profile, tolerance, finish or heat-treatment condition, length, quantity, test or inspection requirement, and delivery destination.

CATALOGUE