440c stainless steel sheet
- 440c stainless steel sheet
440C stainless steel plate represents the highest hardness level in the 400 series martensitic stainless steels, offering exceptional wear resistance combined with good corrosion protection.
As the premium member of the 440 family (440A, 440B, 440C), Walmay steel 440C stainless steel sheets deliver superior performance for cutting tools, bearings, and precision instruments requiring extreme durability.
440c stainless steel sheet Product Description
| Material: | 440c stainless steel sheet | Shape: | Plate (rectangular cross section) |
| Surface treatment: | BA, HL, SB, polished (Mirror) | Standard: | ASTM A240、AMS 5525、AMS 5731 |
| Delivery status: | Solution Annealed；Aged | Thickness: | cold rolled:0.2mm-3.0mm;hot rlled:3.0mm-200mm |
| Technique： | Cold Rolled/ Hot Rolled | Length: | 2000mm,2440mm(8feet),2500mm,3000mm,3048mm(10feet) 5800mm, 6000mm or as your requirements |
| Certification: | ISO, SGS，BV | Width: | 1000mm,1219mm(4feet),1250mm,1500mm,1524mm(5feet), 1800mm,2200mm or as your requirements |
440c stainless steel sheet Processing Technology
| Surface | Features | Processing technology |
|---|---|---|
| 1D | The surface has a discontinuous granular shape known as a fog surface. | hot rolling + annealing shot peening pickling + cold rolling + annealing pickling. |
| 2D | A slightly silvery white color. | hot rolling + annealing shot peening pickling + cold rolling + annealing pickling. |
| 2B | Silver white with better gloss and flatness than a 2D surface. | hot rolling + annealing shot peening pickling + cold rolling + annealing pickling + quenching and tempering rolling. |
| Ba | Excellent surface gloss, high reflectivity, like a mirror surface. | hot rolling + annealing shot peening pickling + cold rolling + annealing pickling + surface polishing + quenching and tempering rolling. |
| No.3 | Good gloss, coarse grain surface. | polishing and tempering rolling for 2D or 2B with 100~120 abrasive materials (JIS R6002). |
| No.4 | Good gloss, fine lines on the surface. | Processing process: polishing and tempering rolling for 2D or 2B with 150~180 abrasive materials (JIS R6002). |
| HL | Silver grey with hair streaks. | 2D products or 2B products with the appropriate granularity of abrasive materials for polishing continuous abrasive grains surface. |
| MIRRO | Specular. | 2D products or 2B products with appropriate granularity of the grinding material grinding and polishing to the mirror effect. |
440c stainless steel sheet Product packaging and loading
For 440c stainless steel sheet packaging: Standard packing for export with waterproof protection.
Other packaging can be customized according to customer requirements.
Port:Shanghai port or Qingdao port
Lead Time:
Quantity (Tons) | 1-5 | 6-20 | 21-100 | >100 |
Est.Time (days) | 3 | 15 | 30 | To be negotiated |
440c steel physical properties and chemical composition
440C stainless steel composition：
| Element | Carbon | Chromium | Manganese | Silicon | Molybdenum | Phosphorus | Sulfur |
| 440C | 0.95-1.20 | 16.0-18.0 | ≤1.00 | ≤1.00 | ≤0.75 | ≤0.040 | ≤0.030 |
| 440B | 0.75-0.95 | 16.0-18.0 | ≤1.00 | ≤1.00 | ≤0.75 | ≤0.040 | ≤0.030 |
| 440A | 0.60-0.75 | 16.0-18.0 | ≤1.00 | ≤1.00 | ≤0.75 | ≤0.040 | ≤0.030 |
440c stainless steel heat treatment： Heat Treatment Guide
Annealing: Heat to 840-900°C (1544-1652°F), slow cool at 22°C/hr (40°F/hr) to 600°C (1112°F)
Hardening: Heat to 1010-1065°C (1850-1950°F), oil quench
Tempering: 150-370°C (300-700°F) for optimal toughness/hardness balance
Note: Cryogenic treatment (-73°C/-100°F) can further enhance dimensional stability
440c stainless steel plate has excellent mechanical properties
| Property | Density | Melting Point | Thermal Conductivity | Electrical Resistivity | Magnetic Permeability |
| Metric Value | 7.7 g/cm3 | 1480-1530°C | 24.2 W/m·K | 0.60 μQ.m | Ferromagnetic |
| Imperial Value | 0.278 lb/in3 | 2696-2786°F | 167.6 BTU-in/hr·ft2.°F | 0.60 Q·circ mil/ft | Ferromagnetic |
440A vs 440B vs 440C Comparison
| Grade | Carbon Content | Typical Hardness | Primary Applications |
| 440A | 0.60-0.75% | 55-57 HRC | Cutlery, surgical tools |
| 440B | 0.75-0.95% | 56-58 HRC | Higher-end knives, industrial blades |
| 440C | 0.95-1.20% | 58-60 HRC | Precision bearings, high-wear components |
Industry Applications
Aerospace: Bearing races, valve components
Medical: Surgical tools, dental instruments
Industrial: Pump shafts, mold components
Cutlery: Premium knives, shears
Automotive: Fuel injector parts, precision gears
440c
STAINLESS
Why Choose Walmay Metal for 440c stainless steel?
Certified Quality: ASTM A276, AMS 5630 compliant
Precision Tolerances: ±0.05mm thickness consistency
Global Sourcing: Available in all standard dimensions
Technical Support: Metallurgical experts on staff
Competitive Pricing: Volume discounts available
Ordering Information
Standard Sizes: 1000mm x 2000mm, 1220mm x 2440mm, 1500mm x 3000mm
Thickness Range: 0.5mm to 50mm (custom available)
Packaging: Plastic coated, wooden crated for export
MOQ: 1 sheet for standard sizes
Stainless steel
FAQ
Unmatched Hardness & Wear Resistance
Achieves 58-60 HRC after proper heat treatment
Outstanding abrasion resistance for long service life
Superior edge retention compared to 440A and 440B grades
Enhanced Corrosion Protection
Higher chromium content than 440A/B (16-18%)
Better rust resistance than tool steels with similar hardness
Maintains integrity in mildly corrosive environments
Precision Machining Capabilities
Excellent machinability in annealed condition (Brinell 255 max)
Predictable dimensional stability during heat treatment
Capable of achieving mirror finishes (Ra < 0.1μm)
Material Versatility
Available in multiple thicknesses (0.1mm to 100mm)
Custom cutting, drilling, and surface finishing options
Suitable for vacuum and food-grade applications
While D2 offers slightly better wear resistance, 440C provides superior corrosion resistance and easier machining.
walmay steel supply 440C plates with:
Mill finish (2B)
Polished (up to #8 mirror)
Satin finish
Bead blasted
440C achieves 58-60 HRC vs 420's 50-54 HRC maximum, making 440C significantly more wear-resistant.
Contact Product
Contact our sales team today for a customized quote on 440C stainless steel plates!
If you have any questions, please use the form below to send us a message or contact Walmay Metal’s office location.
