321 Stainless Steel Round Bar

321 Stainless Steel Round Bar is a high-quality, austenitic stainless steel alloy that is designed for use in high-temperature applications. Known for its excellent resistance to oxidation and corrosion, particularly in environments exposed to acids and heat, 321 Stainless Steel Round Bar offers superior durability and strength. The addition of titanium stabilizes the carbon content, making it ideal for use in critical industries like aerospace, chemical processing, and power generation. Its ability to withstand elevated temperatures makes it a reliable material in demanding applications.

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Product Introduction

A titanium-stabilized austenitic alloy engineered for extreme heat and corrosive environments. Unlike conventional grades, 321 excels in continuous high-temperature applications (up to 900°C) while resisting carbide precipitation and sensitization. Ideal for aerospace, exhaust systems, and thermal processing, it bridges the gap between durability and precision under stress.

Global Specifications & Approvals

Region	Standard	Grade Code
USA	ASTM A276	UNS S32100
Europe	EN 1.4541	X6CrNiTi18-10
China	GB/T 1220	06Cr18Ni11Ti
Japan	JIS SUS 321	-
International	ISO 15510	X7CrNiTi18-10

Material Science Breakdown

Element	Content	Functional Role
Titanium (Ti)	≥5×C% (min.)	Prevents chromium carbide formation during welding/heat exposure
Chromium (Cr)	17.0–19.0%	Forms heat-resistant chromium oxide layer
Nickel (Ni)	9.0–12.0%	Stabilizes structure under cyclic thermal loads
Carbon (C)	≤0.08%	Controlled for weld integrity
Iron (Fe)	Balance	Matrix foundation

Performance Mastery

Mechanical Properties

Tensile Strength: 515–720 MPa (solution-annealed)

Creep Resistance: 120 MPa at 600°C (1.000-hour rupture)

Thermal Cycling Tolerance: 200+ cycles (ambient to 800°C)

Hardness: 70–90 HRB (annealed), customizable via cold drawing

Physical Attributes

Max Service Temp: 900°C (intermittent), 700°C (continuous)

Thermal Expansion: 17.3 μm/m·K (20–100°C)

Oxidation Threshold: Up to 925°C in dry air

Magnetic Response: Non-magnetic post-annealing

5 Industrial Breakthroughs

Heat War Veteran:

Outperforms 304/316 in cyclic heating (e.g., kiln fixtures, jet engine mounts).

Weld Zone Guardian:

Titanium neutralizes carbon, eliminating post-weld decay risks.

Corrosion Arsenal:

Resists sulfuric/nitric acids, steam, and thermal oxidation scaling.

Fatigue Resistance:

30% higher stress-cycle endurance vs. non-stabilized grades.

Sustainability Plus:

85% recycled content; RoHS/REACH compliant.

Mission-Critical Applications

Industry	Transformative Uses
Aerospace	Combustion chamber liners, turbine shafts
Automotive	High-temp exhaust manifolds, EGR components
Chemical	Catalyst grids, pyrolysis tubes
Power Generation	Boiler tubes, superheater supports
Additive Manufacturing	High-purity powder feedstock for 3D printing

Technical Q&A for Engineers

Q1: Why choose 321 over 347 stainless steel round bars?

A: 321 uses titanium stabilization, while 347 employs niobium. 321 offers better formability for deep-drawn parts; 347 excels in higher continuous temps (above 800°C).

Q2: Can 321 bars be used in as-welded conditions?

A: Yes-titanium eliminates sensitization risk. No post-weld heat treatment required for most environments.

Q3: Compliance for food/medical use?

A: Meets FDA 21 CFR 175.300 for indirect food contact; not recommended for implantable devices (use 316L instead).

Strategic Collaboration Perks

Certified Quality:

Mill Test Reports (MTRs) with traceable heat numbers and AMS 5512 compliance.

Tailored Dimensions:

Diameter: 5mm–250mm | Length: 1m–8m (±0.05mm precision) | Custom straightness (±0.1mm/m).

Global Reach:

Stocked in Rotterdam, Houston, Shanghai hubs; air/ocean freight optimized.

Value-Add Services: