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254SMo Chemical Composition 254SMo Rolled Alloys Plate
254SMo is an austenitic stainless steel specifically developed for use in halide-containing environments such as seawater. This steel demonstrates superior performance particularly in halide-containing acids and offers excellent resistance to uniform corrosion. With carbon content below 0.02%, it qualifies as a pure austenitic stainless steel, and when carbon content is under 0.01%, it can be classified as a super austenitic stainless steel.
Features of Inox 254SMo
Super stainless steel represents a specialized category of stainless steel distinguished from conventional types. As a high-alloy stainless steel containing elevated levels of nickel, chromium, and molybdenum, the most prominent example is 254SMo with 6% molybdenum content. The high molybdenum concentration provides exceptional local corrosion resistance, along with superior resistance to pitting corrosion (PI ≥ 40) and stress corrosion in demanding conditions including seawater, aeration, gaps, and low-speed scouring. This makes 254SMo an excellent alternative to nickel-based alloys and titanium alloys.
Furthermore, 254SMo exhibits outstanding high-temperature resistance and corrosion resistance capabilities that surpass those of 304 stainless steel. From a metallurgical perspective, special stainless steels like 254SMo maintain a stable austenitic microstructure.
Extensive field testing and practical experience confirm that 254SMo maintains high crevice corrosion resistance in seawater, even at elevated temperatures—a characteristic shared by only a few stainless steel types. In acidic solutions and oxidizing halide solutions used in paper bleaching applications, 254SMo demonstrates corrosion resistance comparable to the most resistant nickel-based alloys and titanium alloys.
The high nitrogen content in 254SMo provides enhanced mechanical strength compared to other austenitic stainless steels. Additionally, 254SMo offers high ductility, impact strength, and excellent weldability. The elevated molybdenum content results in higher oxidation rates during annealing, producing a slightly rougher surface after pickling compared to conventional stainless steels, though this does not compromise the material's corrosion resistance.
Specification
Standard
UNS
Werkstoff Nr.
EN
SS
AFNOR
254 SMO
S31254
1.4529
X1CrNiMoCuN20-18-7
2378*
Z1 CNDU 20.18.06AZ*
Chemical Properties
The chemical composition of stainless steel grade 254 SMO™ is outlined in the following table.
Element
Content (%)
Iron, Fe
55.69
Chromium, Cr
20
Nickel, Ni
18
Molybdenum, Mo
6.1
Nitrogen, N
0.20
Carbon, C
0.010
Mechanical Properties
The following table shows mechanical properties of stainless steel grade 254 SMO™.
Environmental Protection: flue gas desulfurization for thermal power generation, wastewater treatment
Energy: atomic power generation, comprehensive coal utilization, ocean wave power generation
Petrochemical Industry: refining, chemical equipment
Food: salt production, soy sauce brewing
High concentration chloride ion environment: paper industry, various bleaching devices
Other industrial applications
Grade 254SMo, Type 254SMo, Inox 254SMo, AISI 254SMo, SUS 254SMo, 1.4547, UNS S31254, Acero 254SMo
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2012
Total Annual:
500,000,000-800,000,000
Employee Number:
100~200
Ecer Certification：
Verified Supplier
Company Overview ：
The company has an indoor warehouse of 5000 square meters and an open warehouse of 4000 square meters, which can fully meet the temporary turnover and phased storage of customers' steel pipe reservation.
The subordinate processing plant has 6 sets of medium frequency h... Company Overview ：
The company has an indoor warehouse of 5000 square meters and an open warehouse of 4000 square meters, which can fully meet the temporary turnover and phased storage of customers' steel pipe reservation.
The subordinate processing plant has 6 sets of medium frequency h...
