How To Identify Stainless Steel Materials 304 And 316

Trade Item�� EXW,FOB,CNF,CIF,CFR

duplex and tremendous duplex

We have thousands tons stock of stainless steel sheet and coil with various size and grade,mainly include austenitic stainless steel, martens stainless steel (including precipitation hardened stainless steel sheet & coil), ferritic stainless steel, and duplex stainless steel.

Characteristics of Stainless Steel Sheet and Plate:
High corrosion resistance
High strength
High toughness and impact resistance
Temperature resistance
High workability, including machining, stamping, fabricating and welding
Smooth surface finish that can be easily clean

The amount of Cr and C are adjusted in such a way that a martensitic structure is obtained. Several different components, for example, tungsten, niobium, and silicon, can be added to change the toughness of the martensitic SS. The addition of small amounts of nickel enhances the corrosion resistance and toughness, and the addition of sulfur on this alloy improves the machinability. They have good mechanical properties and moderate corrosion resistance, and they are ferromagnetic.

Martensitic SS have a physique-centered tetragonal crystal construction. The Cr content material in martensitic SS varies from 10.5% to 18%, and the carbon content material can be greater than 1.2%.

Stainless steel is graded by the elements and percentages. The chromium content material have to be 18% or more to be 304 stainless. After a 500 ton press squeezes the nickel it adjustments the distribution of the nickel. The similar is true where the die cuts the stainless increasing the chance that rust will ultimately occur there. All chrome steel is magnetic except austenitic stainless steel which is definitely 300 sequence stainless similar to 304 and 316.

Austenitic stainless steels have a high amount of austenite which makes them mostly non-magnetic. Even though grades similar to 304 and 316 stainless-steel have high amounts of iron in their chemical composition, austenite means they’re non-ferromagnetic. However, if the crystal structure of an austenitic stainless-steel is modified via work-hardening or special thermal therapy, then ferrite can type in some places making the steel partially magnetic. Chemical qualitative identification is a method of figuring out whether magnetic stainless steels contains nickel.

• The quantity of Cr and C are adjusted in such a method that a martensitic construction is obtained.
• Martensitic SS have a body-centered tetragonal crystal structure.
• The Cr content in martensitic SS varies from 10.5% to 18%, and the carbon content material can be higher than 1.2%.
• Several different components, for example, tungsten, niobium, and silicon, may be added to alter the toughness of the martensitic SS.

We produce 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.

Stock Thickness: 0.1-200.0mm
Production thickness: 0.5.0-200mm
Width: 600-3900mm
Length: 1000-12000mm
Grade:
200 series: 201,202
300 series: 301,304,304L,304H,309,309S,310S,316L,316Ti,321,321H,330
400 series: 409,409l,410,420J1,420J2,430,436,439,440A/B/C
Duplex: 329,2205,2507,904L,2304
Surface: No.1,1D,2D,2B,NO.4/4K/hairline,satin,6k,BA,mirror/8K

These elements react with oxygen from water and air to type a very thin, steady film that consists of such corrosion merchandise as steel oxides and hydroxides. Chromium performs a dominant function in reacting with oxygen to kind this corrosion product movie. In truth, all stainless steels by definition comprise a minimum of 10 p.c chromium. The ease of welding largely is determined by the kind of stainless-steel used. Austenitic stainless steels are the easiest to weld by electric arc, with weld properties much like those of the base metal (not chilly-worked).

In addition, as iron oxide occupies a larger quantity than the original steel, this layer expands and tends to flake and fall away, exposing the underlying steel to further assault. This passive film prevents further corrosion by blocking oxygen diffusion to the steel surface and thus prevents corrosion from spreading into the bulk of the metallic. This movie is self-repairing, even when scratched or temporarily disturbed by an upset situation in the surroundings that exceeds the inherent corrosion resistance of that grade.

Popular ferritic stainless steels are iron-chromium binary alloys with 13 to 18 percent chromium. The properties of duplex stainless steels are achieved with an overall lower alloy content material than related-performing tremendous-austenitic grades, making their use price-effective for a lot of purposes. The pulp and paper industry was one of the first to extensively use duplex stainless steel. Today, the oil and fuel business is the biggest user and has pushed for extra corrosion resistant grades, resulting in the development of super duplex and hyper duplex grades. More lately, the less expensive (and slightly much less corrosion-resistant) lean duplex has been developed, chiefly for structural functions in building and construction and within the water business.