Sulzer PumpsCast Materials

Corrosion Resistant Cast SteelsCarbon and Low Alloy Cast SteelsCast Irons

E00510 en (1) 4.2005 (2000), Copyright © Sulzer Pumps Finland Oy

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Pitting and crevice corrosion are

localized forms of corrosion that

can occur with stainless steels.

Wherever there are acid chloride

solutions, such as sea water,

bleach or oxidizing salts e.g. ferric

chloride and cupric chloride, then

this form of corrosion can occur.

Pitting occurs randomly on wetted

PRE = Cr % + 3.3 x Mo % + 16 x N %

CF-3M 27.5

CG-3M 30.8

CD-4MCu(N) 33.4 (34.5)(1

CN-7M 30.0

CN-3MN 46.0

654 SMO 56.0

(1 N = 0.15 %

PRE-Figures of Various Stainless Steels

Pitting and Crevice Corrosion

surfaces in the form of small deep

cavities. Crevice corrosion occurs

in narrow crevices where the solu -

tion can penetrate but is not fl ushed

during normal operation as in other,

more open areas. Attempts have

been made to establish a measure

of the pitting and crevice corrosion

resistance by calculating the sum

of the most important alloying ele-

ments in a weighed form. This sum

is called PRE (Pitting Resistance

Equivalent) and one common ex-

pression is shown below. Using this

formula the fi gures in the table have

been calculated.

1B 34.5

3A 35.6

4A 35.1

5A 43.0

2324 29.9 (31.0)(1

The higher numbers indicate

greater pitting and crevice

corrosion resistance of alloys.

Alloy PRE

Karhula Foundry

One of the foremost manufacturers of stainless pump castings in the world

The Karhula Foundry is part of Sulzer

Pumps Finland Oy, supplying demand-

ing steel and special cast iron cast-

ings primarily to the company’s own

factories in Finland. Other customers

include Sulzer Pumps’ factories in

USA, Germany and Great Britain.

Sulzer Pumps – Striving to Serve You Better!For over 135 years Sulzer Pumps has

been providing innovative pumping

and mixing solutions for a number of

different industry segments. Today we

are a leading global supplier of pumps

and mixers to these targeted markets.

Through our commitment to under-

standing our customers’ process and

specifi c needs, we have consistently

been at the leading edge of technical

developments in providing pumping

and mixing solutions. We strive to

meet your application requirements

through the use of state-of-the-art

tech nology and advanced research &

development facilities.

In addition we offer the pump indus-

try’s most extensive network of Cus-

tomer Service Centers to support and

service our products.

Of the total annual production of some

50,000 castings, 85 per cent are made

of duplex or superduplex steel grades.

Most of the duplex steel grades con-

form to the American ASTM A890

standard. The net weights of the cast-

ings range from 0.5 kg to 15,000 kg.

Molds at the Karhula Foundry are

made by using a method based on a

resin bonded sand or the Replicast®

CS Ceramic Shell molding method.

The Karhula Foundry applies quality

and environmental systems approved

by Det Norske Veritas.

3) AVESTA 654SMO is a trade mark owned by Outokumpu Stainless which has granted Sulzer Pumps licence to produce this material.

Cast Materials

1) Standard corresponding to the internal code is ASTM.2) The hardness is informative value.

Karhula Foundry

One of the foremost manufacturers of stainless pump castings in the world

The Karhula Foundry is part of Sulzer

Pumps Finland Oy, supplying demand-

ing steel and special cast iron cast-

ings primarily to the company’s own

factories in Finland. Other customers

include Sulzer Pumps’ factories in

USA, Germany and Great Britain.

Sulzer Pumps – Striving to Serve You Better!For over 135 years Sulzer Pumps has

been providing innovative pumping

and mixing solutions for a number of

different industry segments. Today we

are a leading global supplier of pumps

and mixers to these targeted markets.

Through our commitment to under-

standing our customers’ process and

specifi c needs, we have consistently

been at the leading edge of technical

developments in providing pumping

and mixing solutions. We strive to

meet your application requirements

through the use of state-of-the-art

tech nology and advanced research &

development facilities.

In addition we offer the pump indus-

try’s most extensive network of Cus-

tomer Service Centers to support and

service our products.

Of the total annual production of some

50,000 castings, 85 per cent are made

of duplex or superduplex steel grades.

Most of the duplex steel grades con-

form to the American ASTM A890

standard. The net weights of the cast-

ings range from 0.5 kg to 15,000 kg.

Molds at the Karhula Foundry are

made by using a method based on a

resin bonded sand or the Replicast®

CS Ceramic Shell molding method.

The Karhula Foundry applies quality

and environmental systems approved

by Det Norske Veritas.

3) AVESTA 654SMO is a trade mark owned by Outokumpu Stainless which has granted Sulzer Pumps licence to produce this material.

Cast Materials

1) Standard corresponding to the internal code is ASTM.2) The hardness is informative value.

Pitting and crevice corrosion are

localized forms of corrosion that

can occur with stainless steels.

Wherever there are acid chloride

solutions, such as sea water,

bleach or oxidizing salts e.g. ferric

chloride and cupric chloride, then

this form of corrosion can occur.

Pitting occurs randomly on wetted

PRE = Cr % + 3.3 x Mo % + 16 x N %

CF-3M 27.5

CG-3M 30.8

CD-4MCu(N) 33.4 (34.5)(1

CN-7M 30.0

CN-3MN 46.0

654 SMO 56.0

(1 N = 0.15 %

PRE-Figures of Various Stainless Steels

Pitting and Crevice Corrosion

surfaces in the form of small deep

cavities. Crevice corrosion occurs

in narrow crevices where the solu -

tion can penetrate but is not fl ushed

during normal operation as in other,

more open areas. Attempts have

been made to establish a measure

of the pitting and crevice corrosion

resistance by calculating the sum

of the most important alloying ele-

ments in a weighed form. This sum

is called PRE (Pitting Resistance

Equivalent) and one common ex-

pression is shown below. Using this

formula the fi gures in the table have

been calculated.

1B 34.5

3A 35.6

4A 35.1

5A 43.0

2324 29.9 (31.0)(1

The higher numbers indicate

greater pitting and crevice

corrosion resistance of alloys.

Alloy PRE