Grade 440C stainless steel is a high carbon martensitic stainless steel. It has high strength, moderate corrosion resistance, and good hardness and wear resistance. Grade 440C 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 440C particularly suited to such applications as ball bearings and valve parts.
Corrosion Resistance:
*Good resistance to the atmosphere, freshwater, foods, alkalies, and mild acids. Best resistance in the hardened and tempered and passivated condition. A smooth polished surface also assists.
*The corrosion resistance of grade 440C approximates that of grade 304 in many environments.
Heat Resistance:
*Not recommended for use in temperatures above the relevant tempering temperature, because of reduction in mechanical properties by over-tempering.
Heat Treatment:
*Annealing - Full anneal - 850-900°C, slow furnace cool to about 600°C and then air cool. Sub-critical Annealing - 735-785°C and slow furnace cool.
H*ardening - Heat to 1010-1065°C, followed by quenching in warm oil or air. Oil quenching is necessary for heavy sections. Immediately temper at 150-370°C to obtain a wide variety of hardness values and mechanical properties as indicated in the accompanying table.
*Tempering in the range 425-565°C is to be avoided because of reduced impact resistance and corrosion resistance. Tempering
in the range 590-675°C results in lower hardness (the product become machinable) and high impact resistance.
Welding:
*If welding is necessary pre-heat at 250°C and follow welding with a full anneal. Grade 420 filler will give a high hardness weld (although not as high as the 440C), but 309 or 310 will produce soft welds with higher ductility.
Machining:
*In the annealed condition this grade is relatively easily machined; approximately the same as for high speed steel. Chips are tough and stringy so chip breakers are important. If these grades are hardened machining becomes more difficult and probably impossible.
440C Stainless Steel Chemical Composition:
Weight % (all values are maximum unless a range is otherwise indicated)
| Element |
Content (%) |
| Iron, Fe |
79.15 |
| Chromium, Cr |
17 |
| Carbon, C |
1.1 |
| Manganese, Mn |
1 |
| Silicon, Si |
1 |
| Molybdenum, Mo |
0.75 |
440C Stainless Steel Mechanical Properties:
| Properties |
Metric |
Imperial |
| Tensile strength |
760-1970 MPa |
110000-286000 psi |
| Yield strength (@ strain 0.200%) |
450-1900 MPa |
65300-276000 psi |
| Bulk modulus |
166 GPa |
24100 ksi |
| Shear modulus |
83.9 GPa |
12200 ksi |
| Elastic modulus |
200 GPa |
29008 ksi |
| Poisson's ratio |
0.27-0.30 |
0.27-0.30 |
| Elongation at break |
2-14 % |
2-14 % |
| Hardness, Rockwell B (converted from Brinell hardness) |
97 |
97 |
440C Stainless Steel Applications:
★Gage blocks
★Cutlery
★Ball bearings and races
★Molds and dies
★Knives
★Valve components
★Measuring instruments
Cold Rolled Stainless Steel Sheet
* Thickness: 0.3mm - 16.0mm
* Width: 1000mm, (4′)1220mm, 1500mm, 1800mm, 2000mm
* Length: Cut as per customer's requirements
* Standard Size: 1000*2000mm, 1219*2438mm, 1220*2440mm, 1250*2500mm, 1500*3000mm, 1500*6000mm, 1800*6000mm, 2000*6000mm, 4'*8'
* Edge: Mill Edge/Slit Edge
* Technique: Cold Rolled
* Surface: 2B/BA/HL/8K mirror/BA/2D/ Titanium coating with Filim
* Standard: ASTM A240/A480M, ASTM B443/SB443, ASTM B625, B709, B618, B435, ASTM A480, A895, A693, DIN 10088, EN 10028, JIS G4304, JIS G4305, etc.
*Grade: 201, 301, 304, 304L, 316, 316L, 316Ti, 321, 317L, 310S, 347H, 410, 420, 409L, 430, 440C, 444, 441, S32760, 2205, 904L, 630, 631, 253Ma, 254SMo, Incoloy 926, Inconel 625, Monel 400 etc.
* Processing Service: Bending, Welding, Decoiling, Punching, Cutting, etc.
Hot Rolled Stainless Steel Plate
* Thickness: 3.0mm - 300mm
* Width: 1000mm, (4′)1220mm, 1500mm, 1800mm, 2000mm-3000mm
* Length: Produce as per customer's requirements
* Standard Size: 1000*2000mm, 1219*2438mm, 1220*2440mm, 1250*2500mm, 1500*3000mm, 1500*6000mm, 1800*6000mm, 2000*6000mm, 4'*8'
* Edge: Mill Edge/Slit Edge
* Technique: Hot Rolled
* Surface: No.1/1D/Pickling
* Standard: ASTM A240/A480M, ASTM B443/SB443, ASTM B625, B709, B618, B435, ASTM A480, A895, A693, DIN 10088, EN 10028, JIS G4304, JIS G4305, etc.
*Grade: 201, 301, 304, 304L, 316, 316L, 316Ti, 321, 317L, 310S, 347H, 410, 420, 409L, 430, 440C, 444, 441, S32760, 2205, 904L, 630, 631, 253Ma, 254SMo, Incoloy 926, Inconel 625, Monel 400 etc.
* Processing Service: Bending, Welding, Decoiling, Punching, Cutting, etc.
Cold Rolled Stainless Steel Coil
* Thickness: 0.4mm - 6.0mm
* Width: 1000mm, (4′)1220mm, 1500mm, 2000mm
* Length: Depends on Coil Weight
* Standard Size: 1000*C, 1219*C, 1220*C, 1250*C, 1500*3000mm, 1500*C, 1800*C, 2000*C, 4'*C
* Edge: Mill Edge/Slit Edge
* Technique: Cold Rolled
* Surface: 2B/No.4/HL/8K/BA
* Standard: ASTM A240/A480M, ASTM B443/SB443, ASTM B625, B709, B618, B435, ASTM A480, A895, A693, DIN 10088, EN 10028, JIS G4304, JIS G4305, etc.
*Grade: 201, 301, 304, 304L, 316, 316L, 316Ti, 321, 317L, 310S, 347H, 410, 420, 409L, 430, 440C, 444, 441, S32760, 2205, 904L, 630, 631, 253Ma, 254SMo, Incoloy 926, Inconel 625, Monel 400 etc.
* Processing Service: Bending, Welding, Decoiling, Punching, Cutting, etc.
Hot Rolled Stainless Steel Coil
* Thickness: 3.0mm - 16mm
* Width: 1000mm, (4′)1220mm, 1500mm, 1800mm, 2000mm,2200mm
* Length: Depends on Coil Weight
Standard Size: 1000*C, 1219*C, 1220*C, 1250*C, 1500*3000mm, 1500*C, 1800*C, 2000*C, 4'*C
* Edge: Mill Edge/Slit Edge
* Technique: Hot Rolled
* Surface: No.1/1D
* Standard: ASTM A240/A480M, ASTM B443/SB443, ASTM B625, B709, B618, B435, ASTM A480, A895, A693, DIN 10088, EN 10028, JIS G4304, JIS G4305, etc.
*Grade: 201, 301, 304, 304L, 316, 316L, 316Ti, 321, 317L, 310S, 347H, 410, 420, 409L, 430, 440C, 444, 441, S32760, 2205, 904L, 630, 631, 253Ma, 254SMo, Incoloy 926, Inconel 625, Monel 400 etc.
* Processing Service: Bending, Welding, Decoiling, Punching, Cutting, etc.
Cold Rolled Stainless Steel Strip
* Thickness: 0.002mm - 3.0mm
* Width: 5mm - 900mm
* Length: Depends on Coil Weight
* Edge: Slit Edge
* Technique: Cold Rolled
* Surface: 2B/BA/HL/8K mirror/BA/2D
* Standard: ASTM A240/A480M, ASTM B443/SB443, ASTM B625, B709, B618, B435, ASTM A480, A895, A693, DIN 10088, EN 10028, JIS G4304, JIS G4305, etc.
*Grade: 201, 301, 304, 304L, 316, 316L, 316Ti, 321, 317L, 310S, 347H, 410, 420, 409L, 430, 440C, 444, 441, S32760, 2205, 904L, 630, 631, 253Ma, 254SMo, Incoloy 926, Inconel 625, Monel 400 etc.
Hot Rolled Stainless Steel Strip
* Thickness: 0.002mm - 16.0mm
* Width: 5mm - 900mm
* Length: Depends on Coil Weight
* Edge: Slit Edge
* Technique: Hot Rolled
* Surface: 1D/Pickling
* Standard: ASTM A240/A480M, ASTM B443/SB443, ASTM B625, B709, B618, B435, ASTM A480, A895, A693, DIN 10088, EN 10028, JIS G4304, JIS G4305, etc.
*Grade: 201, 301, 304, 304L, 316, 316L, 316Ti, 321, 317L, 310S, 347H, 410, 420, 409L, 430, 440C, 444, 441, S32760, 2205, 904L, 630, 631, 253Ma, 254SMo, Incoloy 926, Inconel 625, Monel 400 etc
Hot Rolled Stainless Steel Checkered Plate
* Thickness: 1.0mm - 10mm
* Width: 600mm - 1800mm
* Length: 2000mm - 6000mm
* Edge: Mill Edge/Slit Edge
* Technique: Hot Rolled
* Surface: No.1/1D/Pickling
* Standard: ASTM A240/A480
* Grade: 304, 316L, 430
* Pattern: Chequered pattern, diamond pattern, lentils pattern, leaves pattern, etc.
Q: What kind of ZYTC company?
A: ZYTC is a professional manufacturer of metals and alloy productions and has its own warehouse with more than 30,000 tons capacity. We are working hard to open up the international market. At the same time, we will encounter a variety of purchase orders, In order to meet customer requirements and improve services, we will also distribute some kinds of metal products, of course, our strict procurement management and quality management departments can guarantee excellent quality of all products.
Q: What certificate does ZYTC have?
A: ZYTC acquired the ISO 14001 environmental management system certificate, 0HSAS18001 occupational health and safety management system certificate, and ISO 9001 quality management system certificate.
Q: What's your purchasing system?
A: Our procurement system adopts the 5R principle to ensure the "right quality" from the "right supplier" with the "right quantity" of materials at the "right time" with the "right price" to maintain normal production and sales activities. At the same time, we strive to reduce production and marketing costs to achieve our procurement and supply goals: close relationships with suppliers, ensure and maintain supply, reduce procurement costs, and ensure procurement quality.
Q: Who are your cooperate partners?
A: ZYTC has a very good relationship with world-known factories, such as Baosteel, TISCO, ZPSS, JISCO, ATl, SMC, HAYNES, VDM, ArcelorMittal, etc.
Q: What are your company's payment methods?
A: 30% T/T deposit, 70% T/T balance payment before shipment. More payment methods depend on your choices.
Q: Can you accept small orders?
A: If we have the exact materials in stock, we can deliver even 1 piece. If we don't have the goods in stock, the MOQ is normally 1 ton.
Q: Do you guarantee the safe and reliable delivery of products?
A: Yes, we always use high-quality packaging for shipping. We usually pack the products with a soft material such as polyethylene foam and then pack them in wooden cases to ensure the safety of the product in the process of transportation.
Q: Does ZYTC provide processing services?
A: Yes, we also provide processing services to the outside world, and providing professional services is one of our goals. Such as bending, water cutting, laser cutting, digging holes, welded, slit coil, and other processing according to the drawings.
Q: How to guarantee the quality?
A: Each production procedure will be subject to testing and evaluation. from the very choice of raw materials to the package for shipment. Only the products surviving all the tests are delivered for export.
Q: What if there is a quality problem?
A: We also keep a piece of the sample before shipping. After comparing the buyer's test result, and it turns out to be our problem, we will return the money back and pay for your lost or delivery of qualified materials again.
Q: Can you provide samples?
A: As a professional company, we know that the quality of products is valued by each customer, especially for international trade, we understand the customer's worries, so we can provide samples to customers, and we can ensure the consistency of the quality of samples and batch product products. The sample is free, but the buyer should pay the freight fee. And the freight fee will be returned in the future order.
Q: How about the delivery time?
A: Stock products can be shipped within 3 days. Customized product delivery time is normally 25 working days, but it is also influenced by the specific requirements or the order quantity. Partial shipment is allowed.
Audited Supplier 
Grade 440C stainless steel is a high carbon martensitic stainless steel. It has high strength, moderate corrosion resistance, and good hardness and wear resistance. Grade 440C 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 440C particularly suited to such applications as ball bearings and valve parts.
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