Mechanical Properties Of Stainless Steel Grades:

Moreover, the addition of copper to those grades develops resistance to sulphuric acid and other lowering agents in each aggressive and delicate conditions. Grade 316 is the usual molybdenum-bearing grade, second in significance to 304 amongst the austenitic stainless steels. The molybdenum provides 316 higher general corrosion resistant properties than Grade 304, particularly greater resistance to pitting and crevice corrosion in chloride environments. It is quickly brake or roll formed into a variety of elements for functions within the industrial, architectural, and transportation fields. Post-weld annealing isn’t required when welding thin sections.

904l stainless steel vs duplex

Grade 904L stainless steels have wonderful resistance to heat seawater and chloride attack. The excessive resistance of grade 904L in opposition to stress corrosion cracking is as a result of presence of high amounts of nickel in its composition.

Is 904l better than 316l?

The 316L Stainless steel is far less scratch resistant than the 904L because it has a much higher Rockwell hardness. The main advantage of 904L over 316L is its resistance to acids: “The addition of copper to this grade gives it greatly improved resistance to strong reducing acids, particularly sulphuric acid.”

  • This is why metal Rolex watches look different than other steel watches.
  • Harder and extra rust and corrosion-resistant than different steels, this 904L metal can take and hold a polish extremely well.
  • Sanmac® 2205 is a 22% Cr duplex stainless steel with improved machinability as standard.

Ferralium® 255 weld wire is produced to enhance our main tremendous duplex chrome steel. 904L is a non-stabilised low carbon excessive alloy austenitic stainless SA240 316 Stainless steel plate steel. Alloy 904L performs higher than other austenitic stainless steels due to the larger alloying of nickel and molybdenum.

The mixture of chromium, molybdenum and nitrogen convey the nice resistance of 2205 to chloride pitting and crevice corrosion. This resistance is extremely essential for providers similar to marine environments, brackish water, bleaching operations, closed loop water techniques and a few food processing applications.

The high chromium, molybdenum and nitrogen contents of 2205 present corrosion resistance superior to widespread stainless steels, similar to, 316L and 317L in most environments. Duplex 2205 is a nitrogen enhanced duplex stainless-steel that was developed to fight widespread corrosion issues encountered with the 300 sequence stainless steels. “Duplex” describes a family of stainless steels that are neither fully austenitic, like 304 stainless, nor purely ferritic, like 430 stainless. The construction of 2205 duplex chrome steel consists of austenite swimming pools surrounded by a continuous ferrite section.

Please see our product range and grade.

In the annealed condition, 2205 accommodates roughly 40-50% ferrite. Often known as the work horse grade, 2205 is the most extensively used grade within the duplex family of stainless steels. Duplex and super duplex belong to a family of stainless steels that are characterised by a mixture of simple fabrication, high strength and wonderful corrosion resistance. This group of materials is most just like ferritic and carbon steel, however it has some physical properties consistent with these found in austenitic chrome steel. The two grades of stainless steel most referenced in relation to out of doors environments are 304 and 316L, also referred to as marine-grade stainless-steel.


Unlike the active metals talked about above, stainless steel is referred to as passive as a result of it incorporates other metals together with chromium. For a cloth to be thought of stainless steel, no less than 10.5% of the make-up have to be chromium. Additional alloys sometimes embody nickel, titanium, aluminum, copper, nitrogen, phosphorous, selenium and molybdenum. The key difference between the 304 and the 316L is the addition of molybdenum within the 316L. It is the molybdenum that enhances corrosion resistance in environments rich in salt air and chloride – giving 316L the moniker of “marine grade” chrome steel.