440A Cold Rolled Strip with 0.1-0.8mm thickness for Ball bearings and races, gage blocks

440A Cold Rolled Strip with 0.1-0.8mm thickness for Ball bearings and races, gage blocks

 440A  cold rolled stainless steel strip with   thickness:0.1-0.8mm   width:  10-240mm  HV300-600  Surface:2B BA      

Principal Design Features

This is a high carbon martensitic stainless with moderate corrosion resistance good strength and the ability to obtain and keep excellent hardness (Rc 56) and wear resistance.

Applications

Ball bearings and races, gage blocks, molds and dies, cutlery, valve components, knives and measuring instruments.

Description:

440A is a martensitic stainless steel, the martensitic stainless steel of the chemical composition, characterized in that added to the combination of different components on the basis of 0.1% -1.0% C, 12% -27% Cr the molybdenum, tungsten, vanadium, and niobium, and other elements. Due to the organizational structure of the body-centered cubic structure, and thus a sharp decline in the high temperature strength. Below 600 ℃ highest in various types of stainless steel, creep strength, high temperature strength is also highest. 440A hardened excellent performance, high hardness, high toughness compared 440B steel and 440C steel.

Machinability

Best machined in the annealed condition. Tough, stringy chips can be best handled by the use of chip breakers. Carbide or ceramic tooling is recommended.

Welding

This alloy is not commonly welded due to its tendency to air harden. If it must be welded, preheat to 500 F (260 C) and post weld treat at 1350-1400 F (732-760 C) for 6 hours followed by a slow furnace cooling to avoid cracking. Use similar filler metal and high heat inputs during operations.

Applications:

Mainly used for producing all kinds of blades,such as razor blades, Art blades, Surgery blades.

440B for cutting tools, bearings and valves, compared 440A steel, high hardness, higher than 440C steel toughness. 440C having the highest hardness of all stainless steel, heat resistant steel, for the nozzle, bearings. 440F improve 440C steel-cutting performance steels, for automatic lathes.

Specifications:

Chemical Composition:

Thickness:0.1-0.8mm .Also we could satisfactory to you according to your special requirements.

Width: Usually 10-240mm, . Also we could satisfactory to you according to your special requirements.

Vicker Hardness: HV300-600.

Common razor blade specifications: 0.1*16.97mm  0.1*7.2mm  0.1*22.3mm 0.1*22.4mm

Common surgical blade specifications:0.38*6.5mm 0.38*8.3mm 0.38*10.3mm 0.38*12.3mm 0.4*9.0mm 0.4*10.5mm 0.4*12.5mm

Other sizes as your requirements.

Hot Working

Pre-heat to 1400 F (760 C), then bring slowly up to 1900-2200 F (1038-1204 C)before proceeding. Do not work this material below 1700 F (927 C). Cool material slowly after working and once at room temperature, anneal fully.****Pre-heat to 1400 F (760 C), t

Cold Working

This alloy is considered only slightly cold workable by common practices.

Annealing

1550-1600 F (843-871 C), followed by very slow furnace cooling.

Tempering

For maximum properties, soak at 300 F (148 C). Maximum obtainable hardness is RC 56.

Hardening

Bring the material slowly up to 1400 F (760 C), then on to a soak temperature of 1850 F (1010 C), air or oil cool.

Density: 0.28

Specific Gravity: 7.7

Specific Heat: 0.11

Electrical Resistivity: 360

Melting Point: 2700

MoETensile: 29

Density:

Stainless steel theoretical weight formula:

Weight (kg) = thickness (mm) × width (mm) x length (mm) × density values

Stainless steel gravity:

Chromium stainless take 7.75 ton / M³

Chrome-nickel stainless steel take 7.93 ton / M³

Iron take 7.87 ton / M³

Competitive Advantage:

The martensitic stainless steel of the chemical composition, characterized in that added to the combination of different components on the basis of 0.1% -1.0% C, 12% -27% Cr the molybdenum, tungsten, vanadium, and niobium, and other elements. Due to the organizational structure of the body-centered cubic structure, and thus a sharp decline in the high temperature strength. Below 600 ℃ highest in various types of stainless steel, creep strength, high temperature strength is also highest. 440A hardened excellent performance, high hardness, high toughness compared 440B steel and 440C steel.