SPECIAL IRONS FOR WEAR, HEAT AND CORROSION RESISTANCE
TABLE 1 - CRS Corrosion Resisting Types with Nodular Graphite in an Austenitic Matrix

MEEHANITE
TYPE 		Tensile Strength N/mm² Characteristics Typical Applications
CRS1 390 Non-magnetic Pressure covers for turbine generator sets, housings for switchgear insulator flanges, terminals and ducts
CRS2 370 Like CR4, in terms of corrosion and heat resistance Pumps, valves, compressors, bushings, turbocharger housings, exhaust gas manifolds
CR2W 370 Suitable for production welding using an approved technique, otherwise as for CRS2
CRS3 390 Like CRS2, but better erosion and heat resistance
CRS4 370 Good resistance to corrosion even to dilute sulphuric acid. Good heat resistance. Unsuitable for use in the temperature range 500² C to 600² C Pump components, valves, castings for industrial furnaces subject to high mechanical stress
CRS5 370 High co-efficient of thermal expansion; lower corrosion and heat resistance than CRS2. Good impact properties down to -100² C. Non-magnetic Pumps, valves, compressors, bushings, turbocharger housings, exhaust gas manifolds
CRS6 440 Good impact properties down to -196² C. Non-magnetic Castings for refrigeration engineering for use down to -196² C
CRS7 370 Similar to CR7, good bearing properties Pumps, boilers, filter parts, exhaust gas manifolds, valves, turbocharger housings
CRS8 370 Similar to CR7
CRS9 390 Properties similar to CR8 Pump components, valves, castings for industrial furnaces subject to high nechanical stress
CRS10 370 Low thermal expansion similar to CR9, but more resistant to thermal shock Parts requiring dimensional stability, eg machine tools, scientific instruments, glass moulds
CRS11 370 Similar to CRS10 Parts of gas turbine housings, glass moulds
CRS12 380 Particularly good corrosion, erosion and heat resistance. Better ductility and tougher than CRS9 Pumps, fittings, exhaust manifolds, turbocharger housings, industrial furnace furniture
CRS13 370 Excellent resistance to growth and scaling up to 850² C. Lower co-efficient of expansion, higher ductility and better creep strength than other grades Gas turbine components, housings, support rings, exhaust manifolds and turbocharger housings

 

TABLE 2 - CR Corrosion Resisting Types with Flake Graphite in an Austenitic Matrix

MEEHANITE
TYPE 		Tensile Strength N/mm² Characteristics Typical Applications
CR1 140 Non-magnetic Pressure covers for turbine generator sets, housings for switchgear insulator flanges, terminals and ducts
CR2 170 Good resistance to corrosion particularly in alkalis, dilute acids, sea water and salt solutions. Good heat resistance, good bearing properties, high thermal expansion, non-magnetic at low chromium contents Pumps, valves, furnace components, bushings, piston ring carriers for light alloy metal pistons
CR3 190 Better corrosion and erosion resistance than CR2
CR4 170 Like CR2, but more corrosion resistant to alkalis. High co-efficient of thermal expansion Like CR2, but preferable for pumps handling alkalis, vessels for caustic alkalis, uses in the soap, food, artificial silk and plastic industries. Suitable where copper-free materials are required
CR5 190 Like CR4, but more resistant to erosion, heat and growth Like CR4, but preferred also for high temperature applications
CR6 190 Good resistance to corrosion, even to dilute sulphuric acid. More heat resistant than CR4 and CR5. Unsuitable for use in the temperature range 500 to 600² C Pump components, valve castings for industrial furnaces
CR7 190 Resistant to heat and thermal shock up to 800² C. Good corrosion resistance at high temperatures; excellent erosion resistance in wet stream and slat slurry; average thermal expansion Pumps, pressure vessels, valves, filter parts, exhaust gas manifolds, turbocharger housings
CR8 170 Particularly resistant to corrosion, erosion and heat; average thermal expansion Pump components, valve castings for industrial furnaces
CR9 120 Resistant to thermal shock; low thermal expansion Parts requiring dimensional stability eg machine tools, scientific instruments, glass moulds



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