What’s up guys? We’re back again and Michael’s Talkin Metal! Today our video will be another of the 440 stainless steel variants…… 440 C.
Type 440C in aerospace standards has three levels of internal cleanliness required depending on the specification.
The basic standard, AMS 5630 is for a normal air melt stainless steel. AMS 5880 adds a requirement for internal cleanliness and testing to bearing quality levels. Premium quality AMS 5618 requires a second Consumable Electrode Melt and even more stringent cleanliness limits.
440C has the UNS designation S44004. It is a martensitic alloy that can be heat treated to higher hardness and strength levels than type 440A due to its higher carbon content.
Typical applications require its increased strength and hardness and where the oxidation and corrosion resistance of this 17% chromium alloy is required.
Typical annealing temperature is from 1550 to 1650 deg F followed by slow cooling.
Typical hardening range is 1800 to 1950 deg F followed by an air or oil quench depending on section size. Temper as required for desired hardness
Maximum corrosion resistance is achieved in the fully hardened condition.
440C is magnetic
440C SAE 51440C UNS S44004
Density: point 28 lbs per cubic inch
Mean Coefficient of Thermal Expansion from 32 -212 deg F:
5.7 microinch per inch per deg F
Machinability rating: 40 % (of 1212)
|440 C Chemical Composition:|
|Carbon||0.95 – 1.20 %|
|Manganese||1.00 % Max|
|Silicon||1.00 % Max|
|Phosphorus||0.040 % Max *|
|Sulfur||0.030 % Max **|
|Chromium||16.00 – 18.00 %|
|Nickel||0.75 % Max|
|Molybdenum||0.40 – 0.65 %|
|Copper||0.50 % Max|
|*Phosphorus 0.020 % Max for CEM|
|**Sulfur 0.010 % Max for CEM|
Typical maximum hardness in the annealed condition: 255 BHN
Response to heat treatment in standard sample: 58 RC Minimum
|440C Specifications for annealed condition:|
|AMS 5630||Bars and Forgings|
|AMS 5880||Bars and Forgings – Bearing Quality|
|AMS 5618||Bars and Forgings – Premium CEM Quality|
|AMS-QQ-S-763||Bars, Shapes, and Forgings|
ASTM and ASME standards for commercial applications are too numerous to detail here.
Refer to our website for more information and videos on stainless steels
Additional specifications and part requirements can alter what we have shown you here today.
SO CHECK THE SPECS !!!!!!!!!!! Check out the earlier videos on stainless steels…. and visit us at our website www.michlinmetals.com