Austenitic Steel

austenitic ss

How can I tell if my stainless steel is 304?

Austenite, also known as gamma-phase iron (γ-Fe), is a metallic, non-magnetic allotrope of iron or a solid solution of iron, with an alloying element. In plain-carbon steel, austenite exists above the critical eutectoid temperature of 1000 K (727 °C); other alloys of steel have different eutectoid temperatures.

The carbide varieties at the grain boundaries by C diffusing there from the bulk materials. Owing to the gradual diffusion of Cr, this element is simply taken from a skinny layer alongside the grain boundaries and that layer might thus be drastically depleted of Cr and should lose its corrosion resistance. Heat treating cannot be used to strengthen the vast majority of austenitic stainless steels, with the exception of the precipitation-hardening alloys and, to some extent, the duplex alloys. In the metastable alloys, pressure hardening can induce the formation of martensite within the microstructure, referred to as strain-induced martensite. The distinction between the steady and metastable alloys is considerably arbitrary, as the amount of pressure-induced martensite is a robust operate of temperature and alloy composition.

Our stainless production range

However, with increasing chloride contents, higher alloyed stainless steels such as Type 2205 and super austenitic and tremendous duplex stainless steels are used. Clearly, the risk of losing the corrosion resistance would be lower if the C content material were lower, and right now it is possible to supply austenitic stainless steels with a C content as low as 0.02 wt%. However, for any C content material there’s a critical temperature below which a heat treatment can produce a depleted zone with less than 12 wt% Cr.

Stock Thickness: 0.1-200.0mm
Production thickness: 0.5.0-200mm
Width: 600-3900mm
Length: 1000-12000mm
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

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.


  • When choosing a chrome steel that must endure corrosive environments, austenitic stainless steels are typically used.
  • Additionally, many austenitic stainless steels are weldable and formable.
  • Possessing glorious mechanical properties, the excessive amounts of nickel and chromium in austenitic stainless steels also present outstanding corrosion resistance.

Type 304 and Type 316 stainless steels are unaffected weak bases corresponding to ammonium hydroxide, even in high concentrations and at excessive temperatures. The same grades uncovered to stronger bases such as sodium hydroxide at high concentrations and high temperatures will doubtless experience some etching and cracking. Increasing chromium and nickel contents present increased resistance. Unlike carbon steel, stainless steels don’t endure uniform corrosion when uncovered to wet environments. Unprotected carbon steel rusts readily when uncovered to a mix of air and moisture.

They cannot be strengthened by chilly work to the identical degree as austenitic stainless steels. Austenitic stainless steel is the most important family of stainless steels, making up about two-thirds of all chrome steel manufacturing . They possess an austenitic microstructure, which is a face-centered cubic crystal construction. This microstructure is achieved by alloying steel with enough nickel and/or manganese and nitrogen to maintain an austenitic microstructure in any respect temperatures, starting from the cryogenic region to the melting point.

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

jindal chrome steel sheet

comprise a mix of Cr and Ni which makes them absolutely austenitic beneath most sensible conditions. The Cr content is usually about 18 wt% or larger which is nicely above the critical limit for corrosion resistance, about 12 wt% Cr. It is difficult to provide business steels without any C and some many years ago it was traditional to have around 0.1 wt% C in the austenitic stainless steels. This caused troubles in welded constructions as a result of a Cr-wealthy carbide might precipitate in the warmth-affected zone.

The letter “L” after a chrome steel grade quantity signifies low carbon. Carbon ranges are kept to .03% or underneath to avoid carbide precipitation, which may lead to corrosion.

austenitic ss