What is SUS440A stainless steel? 

SUS440A is a stainless steel material that meets Japanese standards. It is a martensitic stainless steel with high strength and hardness, and has good corrosion resistance. It corresponds to SUS440A stainless steel of Chinese standards.

What are the other standards of SUS440A?

1. National standard GB-T standard: digital grade: S41070, new grade: 68Cr17, old grade: SUS440A,

2. American standard: ASTMA standard: S44002, SAE standard: 1, UNS standard: 440A,

3. Japanese standard JIS standard: SUS440A,

4. German standard DIN standard: 1.4109,

5. European standard EN standard: X70CRN 015.

What are the physical properties of SUS440A?

① Density Density (20°C)/kg/dm3: 7.78,

② Melting point/℃: 1371~1508 ,

③Specific heat capacity (0~100℃)/kg/(kg.k):0.16,

④Thermal conductivity/w/(m.k)100℃-:21.2,

⑸Thermal conductivity/w/(m.k)500℃-:-,

⑥Linear expansion coefficient/(10-6/k)0~100℃: 10.2,

⑦Linear expansion coefficient/(10-6/k)0~600℃: 11.7,

⑧Resistivity (20℃)/(Ω.mm2/m):0.6,

⑨ Longitudinal modulus of elasticity (20°C)/GPa: 200,

⑩Magnetism: Yes.

What are the mechanical properties of SUS440A?

⑴Delivery status: solid solution treatment for bars, solution pickling for plates,

⑵Tensile strength (RM/MPa): 590,

⑶ Extension strength (Rp0.2/MPa): 245,

⑷Elongation A/%: 15,

⑸Reduction of area (Z/%): 1.

What is the heat treatment method of SUS440A? 

①Hardness HBW≤: annealing 255, hardness HRB≤: quenching and tempering 54HRC,

②Heating temperature: 800~920,

③Heating method: slow cooling.How about the corrosion resistance of SUS440A stainless steel?

SUS440A stainless steel is a high alloy martensitic stainless steel with good corrosion resistance in many environments. The alloy has been developed to resist pitting and crevice corrosion in chloride-containing environments, and against oxidizing environments, such as those found in paper mills and chemical plants. The alloy was also found to be resistant to intergranular corrosion.

How is the weldability of SUS440A stainless steel?

SUS440A stainless steel has excellent weldability due to its high martensite content. The martensitic structure also provides good resistance to intergranular corrosion after welding. This grade of stainless steel is commonly used in the food and beverage industry because of its resistance to food acids and alkaline solutions.

What is the difference between SUS440A stainless steel and SUS440B, SUS440C?

SUS440A stainless steel is hard in the hardened state, but tougher than SUS440B and 11Cr17, and softer than SUS440C after heat treatment. Used as cutting tools, measuring tools, bearings.

What are the advantages of SUS440A stainless steel?

SUS440A stainless steel is an austenitic chromium-nickel alloy, which is widely used in many industries for its excellent corrosion resistance and high strength characteristics. Some of the main advantages of SUS440A stainless steel include:

• Excellent Corrosion Resistance: This alloy has excellent resistance to a wide variety of corrosive environments, making it ideal for many industries.

• High Strength: The high strength of this alloy makes it ideal for structural applications.

• Good weldability: The alloy has good weldability and is suitable for various manufacturing processes.

What are the uses of SUS440A stainless steel?

SUS440A stainless steel is hard in the hardened state, but tougher than 8Cr17 and 11Cr17. Often used as cutting tools, measuring tools, bearings.

What is the difference between the three stainless steel materials SUS440A/SUS440B/SUS440C?

The three grades of SUS440A/SUS440B/SUS440C are Gaoming martensitic stainless steel, which can be strengthened by heat treatment. The difference between the three grades is that the carbon content in the steel is different. According to the order of the carbon content from low to high, it is 440A, 440B, 440C. Due to the different carbon content, the hardness after quenching and tempering is also slightly different. The order of hardness after tempering is 440B>440C, the highest hardness.

What are the uses of SUS440A ?

SUS440A application field: generally used to make corrosion-resistant parts such as knives, measuring tools, shafts, valves, hooks, etc. that require stainless or resistance to dilute oxidizing acids, organic acids and salt corrosion

What precautions should be taken when using SUS440A stainless steel? 

SUS440A Stainless Steel is an extremely versatile austenitic chromium-nickel alloy used in a variety of end uses. Despite its high nickel content, SUS440A stainless steel is still non-magnetic. It is easy to shape and weld.

Due to its resistance to carbide precipitation during welding, SUS440A stainless steel is also widely used in other applications where corrosion resistance is important. These include: heat exchangers, chemical processing equipment, nuclear reactors, and more.

To keep your SUS440A Stainless Steel in good condition, be sure to follow these simple tips:-

Wash with warm soapy water after each use

- Quick dry with a soft cloth

- Do not use harsh chemicals or abrasive cleaners

- Regularly coat with a thin coat of mineral oil to prevent discoloration