What is the density of 321?

8000 kg/m³ — the figure the weight calculators on this site use for 321. The value is Outokumpu / stainless technical resources’s.

What is the chemical composition of 321?

C ≤ 0.08, Si ≤ 0.75, Mn ≤ 2, P ≤ 0.045, S ≤ 0.03, Cr 17–19, Ni 9–12, N ≤ 0.1, in mass %, to ASTM A240. An element the standard sets no requirement for is left blank here rather than written as zero.

What are the mechanical properties of 321?

Tensile ≥ 515 MPa, Yield ≥ 205 MPa, Elongation min ≥ 40 % — ASTM A240, Plate/Sheet/Strip, Annealed. Those are the standard’s requirements; the mill test certificate governs the metal delivered.

321 — properties and composition — Hidayath Metal Industries

Designations

UNS: S32100
EN number: 1.4541
EN name: X6CrNiTi18-10
AISI: 321

Density

Density: 8000 kg/m³
Per: Outokumpu / stainless technical resources
Corrosion resistance: Good
Product forms: Sheet, plate, pipe

Chemical composition

Chemical composition — mass %
Standard	Product form	Basis	C	Si	Mn	P	S	Cr	Ni	N	Other rules
ASTM A240	Plate/Sheet/Strip	Specification	≤ 0.08	≤ 0.75	≤ 2	≤ 0.045	≤ 0.03	17–19	9–12	≤ 0.1	Ti: 5x(C+N) min to 0.70 max

mass %. A blank cell means the standard sets no requirement for that element, not zero. Single values are limits: "≤" a maximum, "≥" a minimum.

Reference values from the cited standards. They describe what the standard requires, not a specific heat of material; the mill test certificate governs what is delivered.

Mechanical properties

Mechanical properties
Standard	Product form	Condition / temper	Test temperature	Yield	Tensile	Elongation min	Hardness max	Notes
ASTM A240	Plate/Sheet/Strip	Annealed	20 °C	0.2% offset ≥ 205 MPa	≥ 515 MPa	40 % (Product dependent)	95 HRB	Minimum values.

Each row is one standard, one product form and one condition — the values do not transfer across rows. A blank cell means the standard sets no requirement.

Reference values from the cited standards. They describe what the standard requires, not a specific heat of material; the mill test certificate governs what is delivered.

Typical applications

Elevated-temperature welded equipment

Approximate equivalents

Approximate equivalents: equivalents are a technical reference, not a substitution instruction, verify against project specification.

Approximate equivalents
Grade	Systems	Relationship	Note	Key difference
321	ASTM/AISI/UNS → EN	Same grade, another designation	Commonly cross-referenced stabilized austenitic grade.	Check Ti stabilization requirements. Compared designation: 1.4541 / X6CrNiTi18-10.

Common questions

01What is the density of 321?: 8000 kg/m³ — the figure the weight calculators on this site use for 321. The value is Outokumpu / stainless technical resources’s.
02What is the chemical composition of 321?: C ≤ 0.08, Si ≤ 0.75, Mn ≤ 2, P ≤ 0.045, S ≤ 0.03, Cr 17–19, Ni 9–12, N ≤ 0.1, in mass %, to ASTM A240. An element the standard sets no requirement for is left blank here rather than written as zero.
03What are the mechanical properties of 321?: Tensile ≥ 515 MPa, Yield ≥ 205 MPa, Elongation min ≥ 40 % — ASTM A240, Plate/Sheet/Strip, Annealed. Those are the standard’s requirements; the mill test certificate governs the metal delivered.
04What is 321 used for?: Elevated-temperature welded equipment