CA40 Steel tube
Standard for CA40  steel tube : ASTM A743 is a martensitic stainless steel with good machinability. After heat treatment (quenching and tempering), it has excellent corrosion resistance, polishing performance, high strength and wear resistance. It is suitable for manufacturing plastic molds bearing high load, high wear resistance and under the action of corrosive medium.

After quenching and tempering treatment, CA40 material with hardness below hrc30 has good machinability and is easy to achieve better surface quality. When the hardness is greater than hrc30, the machined parts have good surface quality, but the tools are easy to wear. Therefore, after the material enters the factory, it shall be quenched and tempered first, and the hardness shall reach HRC25 ~ 30, and then cutting shall be carried out.

Higher hardness than 420 after quenching, used as cutting tools, nozzles, valve seats, valves, etc.
The density of CA40 is 7.75g/cm3
Corresponding American brand: 420B
Corresponding British brand: 420S45
Corresponding French brand: z30c13