Stainless Steel 321 (UNS S32100)

SPECIFICATIONS: GRADE 321 | UNS S32100 | ASTM/ASME A240 | Werkstoff 1.4541

wilsonpipeline Pipe Industry Co., Limited is stockists and suppliers of 321 or 1.4541 stainless steel, available in Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe with the ability to meet profiling requirements and distribute globally from our CN facility. 

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.

Used in particular applications within 450-850 degrees centigrade, 321 combines high strength with resistance to scaling and phase stability, Some typical areas of application are, furnace components, superheater and afterburner parts, compensators and expansion bellows.

The main properties are:

• Basic corrosion resistance
• Resistance against intergranular corrosion
• Heat resistant alloy (medium temperature)
• High ductility

Technical Information

Stainless steel 321 is an 18Cr-9Ni austenitic stainless steel stabilised with some titanium additions.

This kind of steel is one of the basic grades of the stainless steels range. Titanium bearing (carbide forming element) avoids intergranular corrosion, even on welded pieces without ulterior water quenching.

Alloys stainless steel 321 exhibit austenitic microstructures free of deleterious carbide precipitations but with CNTi precipitations at the grain boundaries. The grade contains some residual ferrite (≈4%) after solution annealing (1000-1100°C – 1832-2012°F) and water quenching.

CHEMICAL ANALYSIS

Typical values (weight %)
C	Cr	NI	Mo	N	Others
0.050	17.5	9.2	–	–	=5x%C ; up to 0.70
PREN (=%Cr+3.3%Mo+16%N) ≥ 18

MECHANICAL PROPERTIES

Tensile properties after water quenching
°C	°F	Minimum guaranteed values *						Typical values						El %
		Y.S. 0.2%		Y.S. 1%		UTS		Y.S. 0.2%		Y.S. 1%		UTS
		MPa	Ksi	MPa	Ksi	MPa	Ksi	MPa	Ksi	MPa	Ksi	MPa	Ksi
20	68	200	29	240	35	500/ 700	73/ 102	280	40	310	45	600	89	45
100	212	176	25	208	30	460	67	238	34	260	38	550	82	40
200	392	157	23	186	27	410	60	200	29	230	33	450	66	35
300	572	136	20	167	24	390	57	168	26	210	30	435	64	35
400	752	125	18	156	23	390	57	175	25	200	29	420	61	30
500	932	119	17	149	22	310	45	168	24	195	28	340	50	30

* Following EN 10088 hot rolled plates.
The EN guaranteed values are valid for a thickness from 5-75mm.

Impact values
°C	-269	-196	+20
°F	-452	-320	68
KCV (J*cm²) Minimum	62	100	150
KCV (J*cm²) Typical	138	160	25

PHYSICAL PROPERTIES

Interval temper °C	Thermal expansion αx10-6K-1	°C	°F	Resistivity (µΩ cm)	Thermal conductivity (W.m-1.K-1)	Specific heat (J.kg-1.K-1)	Young modulus E (GPa)	Shear modulus G (GPa)
20-100	16	20	68	73	15	500	200	77
20-200	16.5	100	212	77	16	500	194	75
20-300	17	200	392	84	17.5	520	186	71
20-400	17.5	300	572	91	19	530	179	68
20-500	18	400	752	97	20.5	540	172	65
		500	932	102	22	540	165	62

CORRISION RESISTANCE

Quality corrosion tests guaranteed (special request may be discussed)
TEST	Other name	Corrosion (1)	Results
ASTM A 262 A		Intergranular	Step or dual structure
ASTM A 262 B	STREICHER	Intergranular	Not recommended
ASTM A 262 C	HUEY	Intergranular	Not recommended
ASTM A 262 E DIN 50914 RCCM	STRAUSS	Intergranular	No cracking after bending
ASTM G48 A		Pitting	Not recommended (typical CPT = 5°C-41°F)
ASTM G48 B	ASTM G78	Crevice	Not recommended (typical CCT ≤ 0°C-32°F)

APPLICATIONS

Stainless steel 321 is corrosion resistant in:

• Urban media
• Most of diluted organic acids at moderate temperatures
• Most of food and pharmaceutical products
• Pure phosphoricM
  • Whatever concentration in cold solution
  • Up to 10% diluted hot solution
• Caustic solutions free of chlorides or fluorides at medium temperatures

The alloys is not corrosion resistant in chloride containing solutions, even diluted, and in sulphuric acid media.

So, the main applications are:

• Food processing and storage
• Chemical industry
• High temperature

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