254SMO UNS S31254 1.4547 stainless seamless pipe
1. Simple Description:
254SMO is a super austenitic stainless steel.
GB grade: 00Cr20Ni18Mo6CuN
International Grade: 254SMO
American standard Grade: UNS S31254
EU Grade: W. – Nr 1.4547
American standards: ASTM A240/ASME SA-240, ASTM A276, ASTM A182/ASME SA-182, ASTM A312/ASME A312
Size range: 10*2mm to 219*15mm or customized according client’s request
Length Range: 300mm to 20000mm
2. Chemical Composition:
| Grade | Compsition Chemical (Max %) | ||||||||||
| C | Mn | Si | Mn | P | S | Cr | Ni | Mo | N | Ce | |
| 254SMO | ≤0.02 | ≤1.0 | ≤0.8 | ≤1.0 | ≤0.03 | ≤0.01 | 19.5-20.5 | 17.5-18.5 | 6.0-6.5 | 0.18-0.2 | 0.03-0.08 |
3. Mechanical Properties:
| Grade | Mechanical Property | ||
| Yield Strength (N/mm2)/(Mpa) | Tensile Strength (N/mm2)/(Mpa) | Elongtation (%) | |
| 254SMO | ≥300 | ≥650 | ≥35 |
4. 254SMO Description：
a. 254SMO is an austenitic stainless steel. Due to its high molybdenum content, it has extremely high resistance to spot corrosion
and crevice corrosion.
b. This type of stainless steel is developed for use in environments containing halides such as seawater. 254SMO also has good
resistance to uniform corrosion.
c. Especially in acid containing halide, the steel is superior to ordinary stainless steel. Its C content is<0.03%, so it is called
pure austenitic stainless steel (<0.01% is also called super austenitic stainless steel). Super stainless steel is a kind of special stainless steel.
d. First of all, it is different from ordinary stainless steel in chemical composition. It refers to a kind of high alloy stainless steel
containing high nickel, high chromium and high molybdenum. The more famous one is 254SMo containing 6% Mo. This kind of steel
has very good local corrosion resistance.
e. It has good pitting corrosion resistance (PI ≥ 40) and stress corrosion resistance under the conditions of seawater, aeration, crevice
and low-speed scouring.
f. It is a substitute material for Ni base alloy and titanium alloy. Secondly, in terms of high temperature resistance or corrosion resistance,
it has more excellent high temperature resistance or corrosion resistance, which is irreplaceable for 304 stainless steel. In addition,
from the classification of stainless steel, the metallographic structure of special stainless steel is a stable austenitic metallographic structure.
g. As this special stainless steel is a high alloy material, its manufacturing process is quite complex. Generally, people can only rely on
traditional processes to manufacture this special stainless steel, such as pouring, forging, rolling, etc.
5. Application:
1) Oceans: marine structures of marine environment, seawater desalination, mariculture, seawater heat exchange, etc.
2) Environmental protection: flue gas desulfurization device for thermal power generation, wastewater treatment, etc.
3) Energy: atomic power generation, comprehensive utilization of coal, tidal power generation, etc.
4) Petrochemical industry: oil refining, chemical equipment, etc.
5) Food field: salt making, soy sauce brewing, etc.
6) High concentration chloride environment: paper industry, various bleaching devices.
6. Further treatment:
1) Polish
2) Marking:
3) Packing:
7. Container Loading:
