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9Cr18Mo,AISI 440C, Wear Resistance and Corrosion Resistance Plastic mould steel

9Cr18Mo may be a martensitic chrome steel with high carbon and Cr. It bears high hardness, heat resistance, tempering resistance, corrosion resistance and wonderful dimensional stability at elevated temperature. it's appropriate for plastic moulds needed high load, nice wear resistance and sensible corrosion resistance.

Chemical Composition of 9Cr18Mo (%):

C	Si	Mn	Cr	Mo
0.95~1.10	≤0.80	≤0.80	16.00~18.00	0.40-0.70

Standard specification of 9Cr18Mo:

AISI 440C, JIS SUS440C.

Characteristics of 9Cr18Mo:

9Cr18Mo may be a high-chrome and Mo alloy wear resistance and corrosion resistance plastic mould steel with high hardness. The content of chrome within the steel reaches Sixteen Personality Factor Questionnaire or higher, superimposed with atomic number 42|metal} alloy element, so the steel has superior resistance to abrasion and corrosion. it\'s largely appropriate for electrical plastics, home appliances and plastic mould superimposed with flame retardation.

Delivery condition of 9Cr18Mo:

Annealed: ≤269HB

Specifications of 9Cr18Mo:

1. Size of flat bars: 10~130mm*200~410mm.

2. spherical bars: Φ10~Φ200mm.

3. Size of solid flat bars: 100~300mm.

Applications of 9Cr18Mo:

1. Electrical plastics and plastic mould superimposed with flame retardation.

2. appropriate for creating the molds for numerous medium or top-grade electrical switches, chargers and electrical kettle seat.

3. additionally used for creating the molds for plugs and inserts on laptop, camera and alternative preciseness instruments.

Physical Property

Specific Gravity
--	7.62
Density
--	0.2750	lb/in³
Mean Specific Heat
32ºF, 212ºF	0.1100	Btu/lb/ºF
Mean Coefficient of Thermal Expansion
32ºF, 212ºF	5.60	x 10^-6 in/in/ºF
Thermal Conductivity
212ºF	168.0	BTU-in/hr/ft²/ºF
Modulus of Elasticity (E)
--	29.0	x 10³ ksi
Electrical Resistivity
70.0ºF	361.0	ohm-cir-mil/ft

Heat Treatment

Annealing

For maximum softness, this steel ought to be heated uniformly to 1550/1600ºF (843/871ºC). Soak and funky terribly slowly within the chamber. Brinell hardness close to 223. Intermediate or method tempering treatment-heat uniformly to 1350/1400ºF (732/760 centigrade degree). Air cool. Brinell hardness regarding 255.

Hardening

Heat to 1850/1950ºF (1010/1066 centigrade degree); soak; quench in heat oil or cool in air. don\'t overheat. once hot, full hardness can\'t be obtained. See comments underneath corrosion resistance.

Tempering

Heat to 1850/1950ºF (1010/1066 centigrade degree); soak; quench in heat oil or cool in air. don't overheat. once hot, full hardness can\'t be obtained. See comments underneath corrosion resistance.

Processing type

Hot operating

Heat to 1850/1950ºF (1010/1066 centigrade degree); soak; quench in heat oil or cool in air. don't overheat. once hot, full hardness can\'t be obtained. See comments underneath corrosion resistance.

Cold operating

If tempered for optimum softness, this steel are often moderately cold shaped or headed.

Machinability

For most machining operations, this steel cuts best once within the dead soft tempered condition. as a result of its high carbon content it machines somewhat like tool steel. as a result of chips area unit robust and stringy, chip curlers and breakers area unit necessary.

Grinding and sprucing

In cutlery applications, grinding and sprucing area unit vital. 440C works well in these operations however sizable care should be used to not overheat since each the hardness and corrosion resistance is also down.

Welding

Because of its high-hardness capability, this steel is rarely welded. However, if attachment is important, the elements ought to be preheated and maintained at regarding 500ºF (260 centigrade degree), welded, then instantly given a 6-8 hour toughen at 1350/1400ºF (732/760 centigrade degree) with a slow chamber cool. The elements shouldn\'t be allowed to cool down below 500ºF (260 centigrade degree) between attachment and tempering. High attachment heat inputs ought to be used. to get mechanical properties within the weld the same as those within the base metal, attachment consumables of like composition ought to be thought-about. Otherwise, AWS E/ER309 may additionally be thought-about.

Standard:

AMS 5618	AMS 5630
AMS 5880	ASTM A276
ASTM A314	ASTM A473
ASTM A493	ASTM A580
ASTM A756

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