Manufacturer, Supplier & Exporter of Stainless Steel 321 Round Bar

Riddhi Siddhi Impex, based in Mumbai, is a prominent manufacturer, supplier, and exporter of stainless steel products in India. With years of expertise in supplying high-quality metals, the company has built a reputation for reliability, timely delivery, and strict adherence to international standards. They specialize in providing a wide variety of stainless steel bars, sheets, coils, rods, and flanges, including the high-performance SS 321 Round Bars...

Stainless Steel 321 is an austenitic stainless steel grade known for its excellent high-temperature resistance and enhanced corrosion resistance. What distinguishes SS 321 from SS 304 is the addition of titanium, which stabilizes the material against carbide precipitation. This stabilization prevents intergranular corrosion during welding or prolonged exposure to high temperatures, making it ideal for heat-resistant applications..

The chemical composition of SS 321 typically includes 17–19% chromium, 9–12% nickel, and titanium (Ti) at 5 times the carbon content max), along with minor amounts of manganese, silicon, and phosphorus. The low carbon content (~0.08% max) enhances the material's resistance to sensitization and improves weldability. This combination of elements makes SS 321 ideal for chemical, petrochemical, and industrial high-temperature applications..

From a mechanical perspective, SS 321 exhibits tensile strength ranging between 515 and 750 MPa, with a minimum yield strength of 205 MPa. The elongation is typically ≥40%, offering good ductility for forming and machining processes. The hardness usually remains below 95 HRB, ensuring that the material can be processed efficiently without excessive tool wear. These properties ensure long-term durability even in harsh thermal and mechanical conditions...

The company has a strong domestic distribution network covering major industrial hubs and cities such as Mumbai, Delhi, Bengaluru (Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru, Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Vilayat, Somnath, Dahej, Narmada, Ankleshwar, Navsari, Valsad, Rajpipla. This extensive reach ensures that customers across India have access to high-quality SS 321 round bars..

Stainless Steel 321 Round Bar

Specification

Product Name	Stainless Steel 321 Round Bar
Manufacturer	Riddhi Siddhi Impex
Material Grade	SS 321 (UNS S32100)
Standard	ASTM A276 / A479 / ASME SB 479 / EN 10278
Form	Round Bar / Rod
Surface Finish	Hot Rolled, Cold Drawn, Polished, Bright
Size Range (Diameter)	6 mm to 300 mm (custom sizes available)
Length	1 m to 6 m (or customized)
Applications	Furnace Components, Heat Exchangers, Burner Parts, Petrochemical Equipment, Aerospace Components, High-Temperature Machinery

Chemical Composition (SS 321)

Element	Content (%)
Carbon (C)	0.08 Max
Manganese (Mn)	2.00 Max
Phosphorus (P)	0.045 Max
Sulfur (S)	0.03 Max
Silicon (Si)	1.00 Max
Chromium (Cr)	17.0 – 19.0
Nickel (Ni)	9.0 – 12.0
Titanium (Ti)	5 × C Max
Iron (Fe)	Balance

Mechanical Properties

Property	Value
Tensile Strength	515 – 750 MPa
Yield Strength (0.2% offset)	205 MPa Min
Elongation	40% Min
Hardness	≤ 95 HRB
Impact Resistance	Excellent, suitable for high-temperature and welding applications

Dimension Chart (Nominal)

Diameter (mm)	Length (mm)
6 – 25	1000 – 6000
26 – 50	1000 – 6000
51 – 100	1000 – 6000
101 – 150	1000 – 6000
151 – 300	1000 – 6000

Equivalent Grades

Standard	Grade
ASTM	A276 / A479 SS321
EN	1.4541
JIS	SUS 321
GB	06Cr19Ni10Ti

Equivalent Standards

Standard	Description
ASTM A276	Stainless Steel Bars and Shapes
ASTM A479	General Requirements for Stainless Steel Bars
EN 10278	Cold Drawn Stainless Steel Bars
ASME SB 479	Specification for Stainless Steel Bars for General Use

Other Types of Stainless Steel Bars

Type	Description
SS 304 Round Bar	General-purpose stainless steel with good corrosion resistance
SS 316 Round Bar	Corrosion-resistant bar suitable for marine and chemical applications
SS 310S Round Bar	High-temperature grade with low carbon content for oxidation resistance
SS 410 Round Bar	Martensitic stainless steel with high hardness

The primary applications of SS 321 round bars include furnace parts, heat exchangers, chemical and petrochemical equipment, aerospace components, exhaust manifolds, and high-temperature structural components. Its resistance to oxidation, scaling, and thermal fatigue, combined with excellent weldability, makes it highly suitable for environments where both high temperature and corrosion resistance are critical..

Frequently Asked Questions (FAQs)

Q1: What are the common applications of Stainless Steel 321 Round Bar?

A1: It is widely used in furnace parts, heat exchangers, chemical and petrochemical equipment, exhaust manifolds, and aerospace components.

Q2: Can you provide custom diameters and lengths for SS 321 Round Bar?

A2: Yes, Riddhi Siddhi Impex provides custom diameters, lengths, and surface finishes as per client requirements.

Q3: Is SS 321 suitable for welding and high-temperature applications?

A3: Yes, the addition of titanium in SS 321 prevents carbide precipitation, making it excellent for welding and high-temperature environments.

Q4: What surface finishes are available for SS 321 Round Bar?

A4: Available finishes include hot-rolled, cold-drawn, bright, polished, and custom finishes based on project needs.