440C Stainless Steel | SUS440C | 440C Bars and Plates

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440C Stainless Steel | SUS440C | 440C Bars and Plates Stainless Steel 440C Stainless Steel | SUS440C | 440C Bars and Plates Stainless Steel

We are the Leading Supplier of Stainless Steel 440C.  
Stainless Steel 440C is capable of attaining, after heat treatment, the highest strength, hardness and wear resistance of all the stainless alloys. 

We supply and export to Singapore , Indonesia , Brunei and other ASEAN Countries.  
Our specialty is to provide wide range of stainless steel
 with no minimum order (MOQ).

E Steel supply Stainless Steel 440C Round Bars / Rods / Shaft , 440C Plates.  
E Steel is glad to supply and export Stainless Steel 440C to Singapore , may refer : 


Stainless Steel 440C Suppliers 

Stainless Steel 440C ( 1.4125 ) is capable of attaining, after heat treatment, the highest strength, hardness and wear resistance of all the stainless alloys. Its very high carbon content is responsible for these characteristics, which make SS440C particularly suited to such applications as ball bearings and valve parts.

  • Hardenable high-carbon chromium steels designed to provide stainless properties with maximum hardness
  • Have maximum hardness together with high strength and corrosion resistance in the hardened and stress relieved condition
  • Always used in the hardened or hardened and stress relieved conditions
  • None of the alloys has its full corrosion resistance either in the annealed or in the hardened and tempered condition
  • Wide applications where good corrosion resistance along with high hardness or abrasion resistance is required

Standard of 440C Stainless Steel and Equivalent Steel Grades

Country USA BS & DIN Japan
Standard ASTM A276 EN 10088 JIS G4303
Grades S44004/440C X105CrMo17/1.4125 SUS440C


ASTM 440C Stainless Steel Mechanical Properties

Tempering Temperature (°C) Tensile Strength (MPa) Yield Strength 0.2% Proof (MPa) Elongation (% in 50mm) Hardness Rockwell (HRC) Impact Charpy V (J)
Annealed* 758 448 14 269HB max#
204 2030 1900 4 59 9
260 1960 1830 4 57 9
316 1860 1740 4 56 9
371 1790 1660 4 56 9

Corrosion Resistance of 440C Steel 

These stainless steels have good corrosion resistance in the hardened and stress relieved conditions.  Hence, they should, usually, be used only in that condition. These steels are resistant to such conditions as fresh water, steam, crude oil, gasoline, perspiration, and alcohol.


Chemical Composition of 440C Stainless Steel 

Property SS 440A          SS 440B    SS 440C
Carbon .60 – .75 .75 – .95 .95 – 1.2
Manganese 1.00 max 1.00 max 1.25 max
Silicon 1.00 max 1.00 max 1.00 max
Phosphorus .04 max .04 max .04 max
Sulfur .03 max .03 max .04 max
Chromium 16.0 – 18.0 16.0 – 18.0 16.5 – 18.0
Molybdenum .75 max .75 max .75 max
Nickel .50 max NA NA


Mechanical Properties of Stainless Steel 440C 

  SS440A SS440B SS440C
Property Annealed Hardened & Stress Relieved Annealed Hardened & Stress Relieved Annealed Hardened & Stress Relieved
Ultimate tensile strength, psi 105,000 260,000 107,000 280,000 110,000 285,000
0.2% Yield strength, psi 60,000 240,000 62,000 270,000 65,000 275,000
Elongation, % in 2? 20 5 18 3 14 2
Reduction of area, % 45 20 35 15 25 10
Rockwell hardness B95 C51 B96 C55 B97 C57
Impact strength Izod  V-Notch, ft-lbs NA 3-6 NA 2-5 NA 1-5

Hardening of 440C Steel

Stainless steel 440C grade can be hardened by heating at 760°C (1400°F). Temperature can be increased up to 1010°C (1850°F) followed by quenching in warm oil or cool in air. However, don’t overheat, because when overheated, full hardness cannot be obtained.


Because of the high carbon content, these alloys have an abrasive action on cutting tools. In the annealed condition, their machinability rating is about 40% compared to Bessemer oven stock (AISI B1112).  As heat treated, the 440 series stainless steel are difficult to machine because of their high hardness.  For parts that require extensive machining, the free-machining versions, SUS 440F or SUS440F Se, offer improved machining properties.


If annealed for maximum softness, SUS 440A, SUS 440B, and SUS 440C Stainless Steels can be moderately cold formed with only slightly more difficulty than the lower carbon, lower chromium grades of stainless steel. They can also be hot headed. Preheating in the range of 1400 – 1500° F insures the best results in hot working. Parts should be furnace cooled after hot working to prevent cracking.

Heat Treatment

PROCESS ANNEAL:  Heat at 1350-1450° F then cool very slowly in the furnace.
FULL ANNEAL: Heat uniformly at 1550-1600° F soak and cool slowly in furnace to 1000-1250° F at a rate of 20-50° F per hour, then cool in air, oil, or water.
HARDENING: Preheat slowly to 1450° F and soak, then raise temperature to 1850-1950° F, quench in warm oil or air. Products hardness of C55-58 Rockwell.
STRESS RELIEVE:  Heat to 300-800° F for 1 to 3 hours, air cool.

Applications of Stainless Steel 440C

  • Used in numerous applications in areas where a very hard and abrasion resistant stainless is called for
  • Applications include pivot pins, dental and surgical instruments, cutlery valve parts, ball bearings, nozzles, hardened steel balls and seats for oil well pumps, plus valve parts

Our Sales & Supplier Network

Australia, Pakistan,  Malaysia, Singapore, Taiwan, China,Vietnam, Belgium, Japan, South Korea, Philippines, France, United Kingdom, Indonesia, Thailand, Hong Kong, China, Sweden, United States, Dubai, Finland, Brunei,Germany.

E Steel is a Global Metal Procurement Company in providing and sourcing raw materials to the wide range of engineering industries / sectors.  We works as the the Online B2B Metal Marketplace to help our customers in finding the special steels that might feel hard to source locally.  


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