Grade Specification Comparison

Harder and more rust and corrosion-resistant than other steels, this 904L steel can take and hold a polish extremely well. This is why steel Rolex watches look different than different steel watches.

904l stainless steel

Corrosion Resistance

After casting and inspection, the steel is then re-melted in a vacuum to purify it and remove any inclusions that might diminish its corrosion resistance and lead to issues in sharpening. Rolex calls 904L stainless-steel a “corrosion-resistant superalloy.” 904L differs from 316L due to additional Chromium, Molybdenum, Nickel, and Copper that gives it improved resistance to acids. 316L is taken into account a more durable, more durable, “marine grade” steel, but it doesn’t have luster and acid resistance of Rolex’s 904L chrome steel. Rolex aficionados have commented that some folks sweat more acidic than others as demonstrated by finding pits in 316L wrist watches making 904L stainless extra desirable. The two grades of stainless steel most referenced in relation to out of doors environments are 304 and 316L, also called marine-grade chrome steel.

China united iron and steel limited exported 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.

  • Rolex has been identified to send steel again when it does not meet their exacting specifications.
  • Rolex calls 904L chrome steel a “corrosion-resistant superalloy.” 904L differs from 316L because of further Chromium, Molybdenum, Nickel, and Copper which provides it improved resistance to acids.
  • 316L is considered a more durable, more durable, “marine grade” steel, but it does not have luster and acid resistance of 904L.
  • Harder and more rust and corrosion-resistant than different steels, this 904L steel can take and hold a polish extremely properly.
  • This is why steel Rolex watches look different than other steel watches.
  • Once received from Rolex’s steel suppliers, Rolex casts and scans it utilizing an electron microscope that’s able to detecting the slightest structural or surface defect.

Rolex calls 904L chrome steel a “corrosion-resistant superalloy.” 904L differs from 316L due to extra Chromium, Molybdenum, Nickel, and Copper which supplies it improved resistance to acids. 316L is considered a more durable, more durable, “marine grade” steel, however Stainless steel manufacturer it doesn’t have luster and acid resistance of 904L. Once received from Rolex’s steel suppliers, Rolex casts and scans it utilizing an electron microscope that’s able to detecting the slightest structural or surface defect. Rolex has been identified to ship steel again when it doesn’t meet their exacting specs.

You may even see some watch manufacturers refer to 316L as surgical grade steel or marine grade steel. Its popularity in these areas comes from the properties which make it immune to rust and corrosion. Grade 904L stainless steels have excellent resistance to heat seawater and chloride assault.

Is 904l steel expensive?

904L steel is more expensive and much more complicated to machine because of it’s hardness. Rolex had to replace most of their steel production line and tools to be able to handle the change. It helps that they make all their parts in-house, most other brands have to get cases made by outside suppliers.

Unlike the active metals talked about above, stainless steel is referred to as passive as a result of it contains other metals together with chromium. For a material to be considered chrome steel, no less than 10.5% of the make-up have to be chromium.

What is grade 904l stainless steel?

Grade 904L stainless steel is a non-stabilized austenitic stainless steel with low carbon content. This high alloy stainless steel is added with copper to improve its resistance to strong reducing acids, such as sulphuric acid. The steel is also resistant to stress corrosion cracking and crevice corrosion.

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 in 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. In addition to watches, this alloy can be generally used within the meals business, the medical field, and all kinds of water and marine functions.