Comparison Of Physical Properties Of Commonly Used Materials for Pumps

Cast iron

ASTM A48 No. 35B

(GG-25)

241

-

-

210

Used in pump casings, casing covers and parts of bearings.

Ductile iron

ASTM A395 Gr.60-40-18

(GGG-40)

414

275

18

155

Used in casings and covers in various industries.

Carbon steel

ASTM A216 Grade WCB

655

250

22

160

Ductile and strong weldable steel, used e.g. in pump support structures. Also used in hot water pumps.

High-chromium cast iron

ASTM A532 III A level 1 (Cr25)

760

Min. 600

High-chromium white cast iron for wear resistant pumps. Corrosion resistant grade:

well suited for wearing applications in alkaline and slightly acidic condition (PH=3 - 14).

Martensitic

cast steel

ASTM A743 CA-6NM

755

550

15

250

Air-hardening steel with good strength properties. Used e.g. in power industry applications.

Austenitic

cast steel

ASTM A743 Grade CF-8

485

205

35

150

Standard stainless steel grade with good toughness and resistance to nitric acid solutions.

ASTM A743 Grade CF-8M

485

205

30

150

Molybdenum alloyed grade with better resistance to acids and pitting compared to CF-8.

Duplex stainless steel (austenitic-ferritic)

ASTM A890 Grade 1A

(CD4MCu)

690

485

16

260

Used for corrosion and impact of the marine environment and prevent corrosion from acidic gases and liquids.

ASTM A890 Grade 1B

(CD4MCuN)

690

485

16

250

The copper content improves corrosion resistance in e.g. weak sulphuric acid solutions. Molybdenum improves general corrosion resistance.

ASTM A890 Grade 3A

(CD6MN)

655

450

25

230

Steel with better tensile and yield strength compared to austenitic steels. Used for various process industry and seawater applications.

ASTM A890 Grade 4A

(CD3MN)

620

415

25

240

Used for high pressure, high temperature and strong corrosive environment.

ASTM A890 Grade 5A

(CE3MN)

690

515

18

250

Used for equipment in the chemical and pulp industries. Good resistance to sea water.