Stainless steel 321 plate sheet

UNS S32100 SUS321 SS321 S32168 stainless steel plate cold hot rolled

1.Product Description

Type 321 is a standard austenitic 18/8 chromium nickel alloy with the addition of Titanium making it an excellent choice in elevated temperature environments. The titanium stabilizes the material removing its susceptibility to the effects of intergranular corrosion. 321 is therefore the stainless steel material of choice for applications in working environments up to 900° C. A drawback of Type 321 is that the titanium does not transfer well across a high temperature arc, so it is not recommended as a welding consumable. In such instances, 347 is the preferred choice as the Niobium performs the same function as Titanium but can be still transferred across a high temperature arc. Type 347 is therefore the consumable of choice for welding Grade 321.

The steel has excellent forming and welding qualities and excellent toughness even at cryogenic temperatures. If you are looking for a stainless steel to provide resistance to intergranular corrosion, 304L is the normal choice as it is a more commonly used and supplied steel. However, 321 is a much better option in operating temperature environments in excess of 500° C and therefore has its own merits.

Note that Type 321 does not polish well so it is not practical to use this material as cosmetic architectural feature.

2.Standards:

• ASTM 321/321H Sheets
• UNS S32100/S32109 Sheets
• EN number 1.4541* Sheets
• EN name * 6CrNiTi18-10*
• W.Nr. 1.4541/1.4878 Sheets
• DIN *6 CrNiTi 18 10/ 12CrNiTi18 9 Sheets
• SS 2337 Sheets

Alloy 321 (UNS S32100) is stabilized stainless steel plate which offers as its main advantage an excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800 to 1500°F (427 to 816°C). Alloy 321 stainless steel plate is stabilized against chromium carbide formation by the addition of titanium.

Alloy 321 stainless steel plate is also advantageous for high temperature service because of its good mechanical properties. Alloy 321 stainless steel plate offers higher creep and stress rupture properties than Alloy 304 and, particularly, Alloy 304L, which might also be considered for exposures where sensitization and intergranular corrosion are concerns.

3.General Properties

Alloy 321 (UNS S32100) is titanium stabilized austenitic stainless steel plate with good general corrosion resistance. It has excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 800 - 1500°F (427 - 816°C). The alloy resists oxidation to 1500°F (816°C) and has higher creep and stress rupture properties than alloys 304 and 304L. It also possesses good low temperature toughness.

Alloy 321H (UNS S 32109) stainless steel plate is the higher carbon (0.04 - 0.10) version of the alloy. It was developed for enhanced creep resistance and for higher strength at temperatures above 1000oF (537°C). In most instances, the carbon content of the plate enables dual certification.

Alloy 321 stainless steel plate cannot be hardened by heat treatment, only by cold working. It can be easily welded and processed by standard shop fabrication practices.

SS  321 Chemical Composition

SS Grade		C	Si	Mn	P	S	Cr	Mo	Ni	N	Other
Type 321	min. max	- 00.08	00.75	2.00	00.045	00.030	17.0 19.0	-	9.0 12.0	00.10	Ti=5(C+N) 00.70
Type 321H	min. max	00.04 00.10	00.75	2.00	00.045	00.030	17.0 19.0	-	9.0 12.0	-	Ti=4(C+N) 00.70
Type 347	min. max	00.08	00.75	2.00	00.045	00.030	17.0 19.0	-	9.0 13.0	-	Nb=10(C+N) 1.0

 

Stainless Steel 321 Mechanical Properties

SS Type	Tensile Strength minimum (MPa)	Yield Strength 0.2% Proof minimum (MPa)	Elongation minimum (% in 50mm)	Hardness
				Rockwell B (HR B) maximum	Brinell (HB) maximum
321	515	205	40	95	217
321H	515	205	40	95	217
347	515	205	40	92	201