Corrosion Resistant Alloys
SSC-6MO (UNS N08367) is a superaustenitic stainless steel containing in extra of 6% molybdenum. This alloy was developed for corrosion-resistant purposes where conventional stainless steels fail because of chloride pitting and crevice and stress-corrosion cracking. It can be used as an economical substitute for nickel alloys, together with Alloys G, 20, 825, 625 and C276.
Austenitic stainless steels are also non-magnetic, which improves the flexibility of a ship to avoid detection by the enemy. In addition, the weldability of the selected materials is a main materials requirement as the ADH is welded construction. Since welding puts the fabric in a non-optimum metallurgical condition, an over-matched filler steel will be required to fulfill SA240 316 Stainless steel plate the corrosion and strength design objectives. The over-matched weld filler metals normally used for UNS N08367 are in the Ni-Cr-Mo family of alloys, as these supplies have excellent resistance to crevice corrosion in chloride environments. There is presently curiosity in using a 6 Mo chrome steel (UNS N08367) for purposes on naval vessels.
Other 300 sort stainless steels are additionally being thought of for areas within the ADH the place the corrosive conditions over the life of the vessel usually are not as demanding. While corrosion resistance is the first material selection standards, stainless steels also produce other fascinating options, corresponding to excessive strength, improved toughness, and are readily weldable.
- It can be utilized as a cost-effective substitute for nickel alloys, including Alloys G, 20, 825, 625 and C276.
- SSC-6MO (UNS N08367) is a superaustenitic stainless steel containing in extra of 6% molybdenum.
- This alloy was developed for corrosion-resistant applications the place standard stainless steels fail because of chloride pitting and crevice and stress-corrosion cracking.
- The AL-6XN® alloy was designed to be a seawater resistant materials and has since been demonstrated to be resistant to a broadrange of very corrosive environments.
This new design uses austenitic stainless steels to attain a number of aims, including lowered maintenance and repair costs compared to standard designs. Figure 1 exhibits a schematic of the new ADH design in comparison with a traditional hull design2. This new design eliminates the necessity for transverse framing leads and reduces the general variety of parts or body members. The price financial savings related to this design more than offsets the added prices of utilizing more expensive austenitic stainless steels. In order to guarantee resistance to crevice corrosion over the life of the vessel, UNS N08367 was chosen as the popular materials for seawater wetted areas of the ADH design.
The U.S. Navy is reported to have an annual price of corrosion of about $1.2 billion yearly related to corrosion upkeep and repair of about 360 combat ships1. Ongoing efforts to decrease this price include awide variety of subjects and technologies. One part of these cost reduction efforts includes a fundamental change within the hull design for surface ships. A new design has been developed know as the advanced double hull (ADH).
SSC-6MO is appropriate for use in air pollution control, chemical and petrochemical, food and beverage, pharmaceuticals and biotechnology, offshore oil and gasoline, energy generation, pulp and paper and seawater desalination applications. AL6XN® alloy (UNS N08367) is a low carbon, high purity, nitrogen-bearing “tremendous-austenitic” stainless alloy. The AL-6XN® alloy was designed to be a seawater resistant materials and has since been demonstrated to be resistant to a broadrange of very corrosive environments.
Width: 10mm to 3500mm
Length 100mm to 12000mm
Our mainly stainless steel grade: ASTM/ASME Grade 304, Grade 304L,304h, 316, 316L, 316H, 316TI, 321, 321H, 309S, 309H, 310S, 310H, 410S, 2205, 904L, 2507, 254, gh3030, 625, 253MA, S30815, 317L, Type 317, 316lN, 8020, 800, 800H, C276, S32304 and others special requirement stainless steel grade.
While the bottom material has good resistance to corrosion in marine environments, the welds are in a non-optimal metallurgical situation. Therefore over-matched filler metals need to be used when welding this 6-Mo chrome steel to be able to guarantee proper corrosion resistance. Two Ni-Cr-Mo alloys (UNS N06022 and N06059) were used to supply welds of varied dilution amounts.