JIS SUS440C | DIN X105CrMo17/1.4125 | ASTM S44004/440C Stainless Steel
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1: 440C Stainless steel introductionASTM A276 standard grade 440c stainless steel is a high carbon martensitic stainless steel, which is generally supplied in the annealed condition with a maximum Brinell hardness of 269 (Rc29) or annealed and cold drawn with a maximum Brinell hardness of 285 (Rc31).
AISI 440C steel is characterized by good corrosion resistance in mild domestic and industrial environments, including fresh water, organic materials, mild acids, various petroleum products, coupled with extreme high strength, hardness and wear resistance when in the hardened and tempered condition. Grade 440C stainless steel is capable of attaining, after heat treatment, the highest strength, hardness and wear resistance of all the stainless alloys. Small AISI 440C steel sections can be air cooled and quite large sections oil quenched for maximum through hardness.
2: 440C Steel equivalent
Country USA BS & DIN Japan Standard ASTM A276 EN 10088 JIS G4303 Grades S44004/440C X105CrMo17/1.4125 SUS440C
3: 440C steel chemical compositionStandard Grade C Mn P S Si Cr Mo ASTM A276 S44004/440C 0.95-1.20 <=1.00 <=0.04 <=0.03 <=1.00 16.0-18.0 <=0.75 EN10088 X105CrMo17/1.4125 0.95-1.20 <=1.00 <=0.04 <=0.03 <=1.00 16.0-18.0 0.40-0.80 JIS G4303 SUS 440C 0.95-1.20 <=1.00 <=0.04 <=0.03 <=1.00 16.0-18.0 <=0.75
4: 440C steel mechanical properties
The mechanical properties mainly include tensile strength, yield strength, elongation, area or reduction, hardness, impact value, non-metalic inclusion etc. Different heat treatment, the mechanical properties will be different, such as normalized, tempered, QT. If you want to know the properties, kindly contact the salesman.
5: 440C steel overviews
Size Round Dia 1-400mm Plate/Flat/Block Thickness
0.1mm-100mmWidth
500mm-2000mmHeat treatment Normalized ; Annealed ; Quenched ; Tempered Surface condition Black; Peeled; Polished; Machined; Grinded; Turned; Milled Delivery condition Forged; Hot rolled; Cold drawn Test Tensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc. Payment terms T/T;L/C;/Money gram/ Paypal Trade terms FOB; CIF; C&F; etc.. Delivery time 30-45 days Application ASTM 440C steel has been widely used for parts requiring a combination of excellent wear resistance, plus reasonable corrosion resistance.
ASTM Stainless Steel 440C is used typically in the following applications:
- Cutlery
- Ball bearings and races
- Molds and dies
- High quality knife blades
- Valve components, pump parts,
- Measuring instruments, Surgical instruments
- Wear-resistant textile components.
6: Heat Treatment of 440C Stainless Steel
Hot Working
AISI grade 440C stainless steel is pre-heated at 760°C (1400°F). Temperature can be increased up to 1038-1204°C (1900-2200°F). It should not be heated below 927°C (1700°F). It is then slowly cooled at room temperature and fully annealed.
Cold Working
ASTM Grade Steel 440C is slightly cold workable using common practices.
Annealing of 440C Steel
For maximum softness, AISI 440C steel is annealed at 843-871°C (1550-1600°F), followed by slowly cooling in the furnace.
Tempering of 440C Stainless Steel
Stainless 440C steel can be tempered by soaking at 148°C (300°F). Steel 440c hardness at approximately Rockwell C 60 will be obtained. To remove peak stresses and yet retain maximum hardness, temper at least one hour at 300/350oF (149/177oC).
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.
7: Corrosion Resistance
AISI stainless 440C steel has a corrosion resistance somewhat similar to 410 grade, but lower than 431 grade, also lower than most of the 400 series ferritic stainless steels and all of the 300 series austenitic stainless steels.
8: Delivery condition
For hot forged bar, usually the delivery condition is hot forged, annealed/QT rough turned/Black surface.
For hot rolled bar, usually the delivery condition is hot rolled, annealed/QT, Black surface.
For hot forged plate, usually the delivery condition is hot forged, annealed/QT, milled surface
For hot rolled plate, usually the delivery condition is hot rolled, annealed/QT, black surface.
