How much is the price of 440C hardness stainless steel plate

Hello, 440C stainless steel plate** is 14600 yuan a ton.

440C is a martensitic type stainless steel. Carbon content, chromium content 16-18%. It has strong rust resistance and is a high-quality stainless steel.

Scope of application: It is mainly used to manufacture bearing parts that work in corrosive environments and non-lubricated strong oxidation atmospheres. 440C has good high-temperature dimensional stability, so it can also be used as corrosion-resistant high-temperature bearing steel.

In addition, it can also be used to manufacture high-quality knives, such as medical scalpels, scissors, nozzles, bearings, etc. 440C has a lower capacity to withstand dynamic loads.

Chemical composition. Carbon C:

Silicon SI:

Manganese mn:

Sulfur s: phosphorus p:

Chromium Cr: Nickel Ni: Allowed to contain

Mechanical properties. Hardness: annealed, 269HB;

Quenched and tempered, 58hrc

Mechanical properties: internal stress (250 n mm2).

Tensile strength (560 nm2).

el(18 %)hb(250）[1]

Heat treatment process.

1) annealing, 800 920 slow cooling;

2) Quenching, 1010 1070 oil cooled;

3) Tempering, 100 180 quick cooling.

440A stainless steel is a high-chromium martensitic stainless steel, which has higher quenching hardness than 420, has high strength and hardness in the quenching and tempering state, and has stainless corrosion resistance.

1. 440A stainless steel corresponding grades: 1. National standard GB-T standard: digital grade:

S41070, new grade: 68CR17, old grade: 7CR17,2, American standard:

ASTMA Standard: S44002, SAE Standard: A, UNS Standard:

440A, 3, Japanese standard JIS standard: SUS440A, 4, German standard DIN standard: , 5, European standard EN standard:

x70crn 015。

2. Chemical composition of 440A stainless steel: carbon c: , silicon si:, manganese mn: , phosphorus p: , sulfur s: , chromium cr:, nickel ni: charge allowed, molybdenum mo:

Charge allowable addition, nitrogen n:—, copper cu:— other elements:

3. Physical properties of 440A stainless steel: density density (20).

kg , melting point :1371 1508 , specific heat capacity (0 100 ) kg (, thermal conductivity w (

100 , thermal conductivity w (

500 -: coefficient of linear expansion.

10-6/k)

0 100 , linear expansion coefficient (10-6 k).

Resistivity (20).

ω.mm2 m), longitudinal modulus of elasticity.

20) GPA:200, Magnetic:Yes.

4. Mechanical properties of 440A stainless steel: Delivery status: bar solution treatment, plate solution pickling, tensile strength (rm mpa):

590, Elongation strength (:245, elongation a %: 15, section shrinkage (z %):

One. 5. 440A stainless steel heat treatment: Hardness HBW: annealed 255, hardness HRB: quenched and tempered 54HRC, Heating temperature: 800 920, Heating method: slow cooling.

440A stainless steel application field: generally used to make stainless steel or resistance to dilute oxidizing acids, organic acids and salt corrosion of knives, gauges, shafts, valves, hooks and other corrosion-resistant parts.

440A belongs to the American standard martensitic stainless steel, and the implementation standard: ASTM A276 A276M-17

440A factory hardness 217HB

440A stainless steel has excellent quenching and hardening performance, high hardness, and high toughness compared with 440B steel and 440C steel. It is used as cutting tools, measuring tools, and bearings.

The chemical composition of 440A is shown in the following figure:

440A stainless steel is equivalent to 7Cr17 in China's standard, and the hardness of 440A steel plate in the supply state is HB217

The difference between 430 and 440 stainless steel: 1. Different types: stainless steel 430 is ferritic stainless steel, and stainless steel 440 is high-strength cutting edge steel.

2. Different performance: stainless steel 430 has strong magnetism, general anti-corrosion performance, good toughness, and can be used for deep drawing treatment. Stainless steel 440 has excellent corrosion resistance, is washable, can run on liquids, and has a slower depletion rate.

3. Different uses: 430 is mainly used for building decoration, fuel burner parts, household appliances, and home appliance parts. The most common application example of the 440 is the "razor blade".

There are three commonly used models: 440A, 440B, 440C, and 440F (easy to process). 4. The element content is different

430 stainless steel has a higher iron chromium content, and stainless steel 440 has a slightly higher carbon content.

440C stainless steel heat treatment:

1. Annealing, 800 920C (must be wire cooled).

2. Quenching, 1010 1070 oil cooling (after quenching, there are conditions to enter "cryogenic mathematics", which can improve the primacy).

3) Tempering, 100 180 quick cooling. The quenching and hardening performance is excellent, the hardness is high, and it has higher initial properties than 410 and 40C steels. 440B is used for cutting tools, measuring tools and bearings with higher hardness than 40A steel, and higher initial properties than 440C0 steel.

The hardness of 440C quenching can reach HRC56 58.