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AISI440Cstainless steel plate/sheet  1)high carbon chromium steel  2)max hardness with stainless properties  3) Rockwell C 60

(1)440-C Stainless UNS S44004/GB 9Cr18Mo/AISI 440C/DIN 1.4125/JIS SUS440C

440-C stainless steel is a high carbon chromium steel.

When heat treated 440-C can be hardened to Rockwell C 60 which is the highest hardness of any stainless steel.

 (2)Chemistry Analysis

Carbon	0.95-1.20%	Manganese	1.00%
Phosphorus	0.040%	Sulfur	0.030%
Silicon	1.0%	Chromium	16.00 - 18.00%
Iron	77.98-80.23%	Molybdenum	0.75%

 (3)Heat Treatment

1)Annealing:

typical Heat uniformly, 1550/1600f (843/871c) Soak and cool very slow in furnace, brinell hardness approximately 223. Process anneal, heat uniformly to 1350/1400 (732/760c), air cool brinell hardness aprox 255.

 Before tempering make sure parts are to room temperature after hardening. This will complete the transformation of martensite, which is necessary to prevent non-uniform structures and hardness.

2)Hardening: Heat to 1850/1950f (1010/1066c) soak, quench in warm oil or air cool. Do not over heat, when overheated maximum hardness cannot be obtained. Take care to minimize temperature time at 2000f (1099c) to avoid excessive grain growth. For best corrosion resistance, temper below or around 800f (427c).

3)Tempering: Hardened 1900 f (1038c) oil quench and tempered one hour (1” rd)

Tempering temperature F	Tempering temperature C	Brinell Hardness
300	149	60
400	204	59
500	260	57
600	316	56
700	371	56
800	427	56

 (4)Corrosion Resistance

The following table is for reference only, many factors can affect the corrosive resistance, a corrosion test for each application should be applied.

Phosphoric acid	Restricted	Acetic Acid	Good
Sodium Hydroxide	Moderate
Salt Spray	Restricted	Nitric Acid	Moderate
Sulfuric Acid	Restricted	Humidity	Good

(5)Typical Room Temperature Tensile Properties

Hardened 1900f (1038c) and oil quenched, tempered 600f (316c)

0.2% Yield Strength		Ultimate Tensile Strength		% Elongation in 2” (50.8mm)	% Reduction of area	Brinell Hardness
ksi	Mpa	ksi	Mpa			ksi
275	1896	285	1965	2	10	580

(6)Machinability:

440C machines best in the annealed condition. Because of the high carbon it machines like high speed steel. The chips will be tough and string so a chip curler or breaker should be used. If polishing, use care in the tempered condition no to overheat as hardness will be compromised. If polishing is important an individually forged product will polish best.

 (7)Shapes Manufactured:

Flat Bars, Square Bars, Round Bars, Rings, Hollows, Discs, Blocks and special Shapes.

Send us a drawing to see how we can save you material and Machining time!

(8)Applications:

440-C stainless steel was originally used in bearing assembles, including ball bearings and races. It is widely used in cutlery, valve seats, needle valves, ball valves, pump parts, bushings and textile machinery.

stainless steel plate