Duplex Stainless Steel Castings - Norton Cast Products

Duplex Steel Castings are ideal for challenging environments

The unique combination of high strength, toughness and corrosion resistance, particularly localised corrosion, make Duplex Steel ideal for the oil & gas and petro-chemical industry.

Duplex Steel is particularly suited to applications in challenging environments such as the North Sea, in chloride and sulphur environments, at temperatures as low as -50ºC and as high as 300ºC. It is stronger and more resistant to localised corrosion phenomena such as crevice corrosion, pitting corrosion, and stress corrosion cracking than austenitic stainless steels, and stronger and tougher than ferritic stainless steels particularly at low temperature, and tougher and more corrosion resistant than martensitic stainless steels.

Norton Cast Products have become specialists at producing castings in duplex alloys, so if you are sourcing duplex stainless castings for use in sea water, low temperature or similarly aggressive conditions then Norton Cast can work with you to produce a bespoke product to meet the most demanding specifications.

Typical Environments Duplex Steel Castings are designed for...

Oil and Gas: a wide range of equipment: flowlines, manifolds, risers, pumps, valves
Pulp and Paper: digesters, pressure vessels, liquor tanks
Chemical engineering: pressure vessels, heat exchangers, condensers, distillation columns, agitators, marine chemical tankers
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
Architecture and Infrastructure

Why Choose Norton Cast Products?

Norton Cast Products has the expertise to manufacture castings in this demanding material; using a well-established and proven manufacturing process which is approved in accordance with NORSOK M650, Equinor TR2000, ISO 9001, ISO 14001, ISO 45001, PED 2014/68/EU Annex I 4.3 assessed by TUV Nord, DNV GL rules for classification – ships, ABS Rules, BV Mode II.
Norton Cast Products can produce castings in duplex; and super duplex steel:

with wall sections size – 8 mm to 250 mm
weighing – 0.2 kg up to 7,000 kg
in one offs or in batches
of complex geometry using the sand casting process, such as impellers and pump bowls
to test the material and components to ensure integrity of the finished product
in compliance with industry and end user specifications

Duplex

Duplex stainless steel is a stainless steel in that it contains more than 10.5% Cr, and has a dual-phase microstructure of roughly equal parts ferrite and austenite. The metallurgy of duplex steels is complex, and seeks to optimise competing properties of strength, toughness, corrosion resistance and manufacturability.

Cast Designation	Nominal Composition
	C	Mn	P	S	Si	Cr	Ni	Mo	N	Cu	W	PREN
EN 10283 GX4CrNiN26-7 (1.4347)	0.05	1	0.02	0.01	1	26	7					30
ASTM A890 CE8MN (2A) ASTM A995 CE8MN (2A) UNS J93345	0.08	1	0.02	0.01	1	24	10	4	0.2			38
ASTM A890 CD6MN (3A) ASTM A995 CD6MN (3A) EN 10283 GX4CrNiMoN26-5-2 (1.4474) UNS J93371	0.06	1	0.02	0.01	1	25	5	2	0.2			34
ASTM A890 CD3MN (4A) ASTM A995 CD3MN (4A) EN 10283 GX2CrNiMoN22-5-3 (1.4470) EN 10213 GX2CrNiMoN22-5-3 (1.4470) UNS J92205	0.03	1	0.02	0.01	1	22	5	3	0.2			34
EN 10283 GX2CrNiMoN26-6-3 (1.4468)	0.03	1	0.02	0.01	1	25	6	3	0.2			38

Super duplex

Super duplex steels must have sufficient levels of Cr, Mo, N and W to give a pitting resistance equivalent number (PREN) over 40%. These grades have increased pitting corrosion resistance over duplex and austenitic grades. Pitting resistance is equivalent to super austenitic grades of steel at a much lower cost.

Cast Designation	Nominal Composition
	C	Mn	P	S	Si	Cr	Ni	Mo	N	Cu	W	PREN
ASTM A890 CE3MN (5A) ASTM A995 CE3MN (5A) EN 10283 GX2CrNiMoN26-7-4 (1.4469) EN 10213 GX2CrNiMoN26-7-4 (1.4469) UNS J93404	0.03	1	0.02	0.01	0.5	25	7	4	0.2			40 min.
ASTM A890 CD3MWCuN (6A) ASTM A995 CD3MWCuN (6A) EN 10283 GX2CrNiMoN25-7-3 (1.4417) EN 10213 GX2CrNiMoN25-7-3 (1.4417) Zeron 100 UNS J93380	0.03	1	0.02	0.01	0.5	25	7	4	0.2	1	1	40 min.

Copper bearing duplex

Duplex steels may contain copper additions which seek to optimise corrosion resistance. Precipitation hardening can be applied to these alloys to increase yield strength, as with Labour R48.

Cast Designation	Nominal Composition
	C	Mn	P	S	Si	Cr	Ni	Mo	N	Cu	W	PREN
ASTM A890 CD4MCuN (1B) ASTM A995 CD4MCuN (1B) Labour R48 UNS J93372	0.04	1	0.02	0.01	1	25	5	2	0.2	3		34
EN 10283 GX2CrNiMoCuN25-6-3-3 (1.4517) EN 10213 GX2CrNiMoCuN25-6-3-3 (1.4517)	0.03	1	0.02	0.01	1	25	6	3	0.2	3		38
ASTM A890 CD3MCuN (1C) ASTM A995 CD3MCuN (1C) UNS J93373	0.03	1	0.02	0.01	1	25	6	3	0.2	1.5		38