321 Stainless steel coil manufacturer

321 stainless steel is a kind of material with excellent Stress Rupture property and Creep Resistance of high temperature Stress mechanical property, which are better than 304 stainless steel.

321 Stainless steel coil Price in China ,Manufacturer of 321 Stainless Steel coil

Austenitic stainless steel equivalent to domestic grade 0Cr18Ni10Ti 321 stainless steel is Ni-Cr-Mo type austenitic stainless steel, its performance is very similar to 304, but due to the addition of titanium, so that it has a better resistance to grain boundary corrosion and high temperature strength.
Due to the addition of titanium, the formation of chromium carbide is effectively controlled.

321 austenitic stainless steel has good corrosion resistance in the atmosphere, and is widely used in petrochemical, electric power, bridge and automobile industries.
But the stainless steel "rust" is not absolute, because of the special service environment, stainless steel will also occur corrosion.
Medium concentration, pH value, temperature and other factors will have a greater impact on the corrosion resistance of stainless steel.
For example, in the range of 450~850℃ sensitization temperature long-term use, stainless steel will occur intergranular corrosion.
The mechanism is that C combines with Cr at grain boundary to form Cr23C6 and precipitates out, which reduces Cr content at grain boundary, which is the so-called "poor chromium".
The Cr element is one of the main elements to inhibit the intergranular corrosion. When the Cr content at the grain boundary is less than 12%, the probability of intergranular corrosion will increase.

Equivalent Material of 321 Stainless Steel  coil

Standard Specification Of 321 coil

321 stainless steel composition content.

Alloys 321 and 347 have similar resistance to general corrosion as the unstable Ni-Cr 304.
Prolonged heating in the temperature range of the chromium carbide degree may affect the corrosion resistance of alloys 321 and 347 in harsh corrosive media.
The corrosion resistance of the two alloys is similar in most environments;
However, the corrosion resistance of the annealed alloy 321 in the strong oxidizing environment is slightly lower than that of the annealed alloy 347.
Alloy 347 is therefore superior in water and other low temperature environments.
When exposed to the temperature range from 800°F to 1500°F (427°C to 816°C), the overall corrosion resistance of alloy 321 is much worse than that of alloy 347.
Alloy 347 is primarily used for high temperature applications where strong resistance to sensitization is required to prevent intergranular corrosion at lower temperatures.

321 Characteristic machining technology

1D -- The surface has discontinuous granular shape, also known as fog surface.
Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling.
2D - A slightly silvery white colour.
Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling.
2B -- Silver white with better gloss and flatness than a 2D surface.
Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling + quenching and tempering rolling.
Ba - Excellent surface gloss, high reflectivity, like a mirror surface.
Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling + surface polishing + quenching and tempering rolling.
No.3 -- Good gloss, coarse grain surface.
Processing technology: polishing and tempering rolling for 2D or 2B with 100~120 abrasive materials (JIS R6002).
No.4 -- Good gloss, fine lines on the surface.
Processing process: polishing and tempering rolling for 2D or 2B with 150~180 abrasive materials (JIS R6002).
HL -- Silver grey with hair streaks.
Processing technology: 2D products or 2B products with appropriate granularity of abrasive materials for polishing the surface is a continuous abrasive grain.
MIRRO -- Specular.
Processing technology: 2D products or 2B products with appropriate granularity of the grinding material grinding and polishing to the mirror effect.