Can stainless steel 1.4418 be used in seawater???????
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Regarding resistance to seawater corrosion, it mainly depends on its Mo content. The Mo content in 1.4418 grade steel is higher than that in 304 steel, falling within the range of 0.8–1.5; it is lower than the Mo content in 316 steel, which is 2–2.5. I’m not sure whether stainless steel grade 1.4418 can be used in seawater environments. Please give me some advice, experts. Ah, it’s urgent.:handshake :handshake
Regarding seawater, aluminum-bronze and duplex stainless steels such as 1.4462 and 1.4469 are the best choices, but they are relatively expensive; in applications involving seawater, pipes made of 1.4408 stainless steel seem to be the most common option.
1.4418 (X4CrNiMo16-5) is roughly equivalent to ASTM A 546 gr. 630.
Hero Yunfei: So, can it actually be used? I’m not very familiar with the grade you mentioned...:handshake
I’m sorry, I’m not familiar with it either; I’ve never used this material, and I don’t have this standard available. Please ask other classmates to continue helping
As Brother Yunfei said, this material has mechanical properties similar to those of 17-4PH (SUS630, 0Cr17Ni4Cu4Nb). It is designated as EN 1.4418 under European standards, S165M under American standards, X4CrNIMol6-5-L in German standards, and 0Cr16Ni5MoN in Chinese standards. It is a martensitic/ferritic stainless steel that boasts excellent physical properties and ductility, as well as good weldability. It is widely used in propellers and machine tool components such as shafts and bolts. Its chemical composition is as follows: C% ≤0.05, Si% ≤1.0, Mn% ≤1.5, P% ≤0.035, S% ≤0.015, Cr% 15-16.5, Ni% 4.5-6, Mo% 0.8-1.5, N% ≥0.02； Mechanical properties: Yield strength ≥ 700 MPa, tensile strength ≥ 900–1000 MPa, elongation ≥ 14% ； Heat treatment: Standardized treatment at 1000°C, followed by cooling in air. Then the temperature is adjusted to 560 – 580 ℃, and it is cooled in air. Its density is 7.7 g/cm3. The coefficient of thermal expansion is 12.0×10-6 K-1 at 20–100 °C, 12.5×10-6 K-1 at 20–300 °C, and 13.0×10-6 K-1 at 20–500 °C. This material also performs excellently in seawater. Currently, many marine propellers worldwide are made from 17-4PH as well as this 1.4418 material, and it is also widely used in steels for military vessels. I know that Shanghai Chaozhan Metal Materials Co., Ltd. sells this type of material. Their contact details are: Tel: 021-65616598, Fax: 021-65613389, MSN and email: sus632@hotmail.com
Those upstairs are solving problems while also promoting themselves; you must be Shanghai Chaozhan Metal Materials Co., Ltd., right? shzzjs:lol
Stainless steel is best not to be used in seawater environments due to the high cost; scrap metal pipes or steel-plastic composite pipes can be used instead.