Technical Details Summary
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Manufacturing Process: Hot rolling, black forging, cold drawing, centerless precision grinding, peeling, and surface polishing to h9, h10, and h11 tolerance classes.
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Dimensional Range: Diameters from 3.17 mm up to 350 mm; standard random lengths of 3 meters to 6 meters and precision cut-to-length billets.
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Manufacturing Standards: Fully compliant with ASTM A276, ASTM A479, ASME SA276, ASME SA479, EN 10088-3, and NACE MR 01-75 / ISO 15156.
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Available Grades: Austenitic (304/L/H, 309S/H, 310S/H, 316/L/H/Ti, 317, 321/H, 347/H), Ferritic/Martensitic (410, 420, 430, 431, 440A/B/C, 444, 446), and Duplex/Super Duplex (S31803, S32205, S32550, S32750, S32760).
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Quality & Verification: EN 10204 3.1 Mill Test Certification, Ultrasonic Testing (UT) to SEP 1921, PMI Testing, Microstructure Analysis, and Mechanical Tensile/Impact Verification.
Stainless Steel Round Bars Specifications
Detailed dimensional parameters, manufacturing methods, and standard supply capabilities offered by Trident Metal & Alloys.
| Specification Parameter | Manufacturing Capabilities & Supply Limits |
|---|---|
| Diameter Range | 3.17 mm to 350 mm DIA in Cold Drawn, Centerless Ground, Peeled, Rough Turned, and Forged finishes |
| Dimensional Tolerances | ISO h8, h9, h10, h11, k12, ASTM A484, DIN 1013, BS 970 Class 1 |
| Finish Variations | Bright Drawn (BD), Centerless Ground (CG), Peeled & Polished (P&P), Black Forged (BF), Rough Turned (RT) |
| ASTM A276 / A479 Austenitic | 304, 304L, 304H, 309S, 309H, 310S, 310H, 316, 316L, 316H, 316Ti, 317, 321, 321H, 347, 347H |
| ASTM A276 / A479 Martensitic & Ferritic | 410, 420, 430, 431, 440A, 440B, 440C, 444, 446 |
| ASTM A276 / A479 Duplex & Super Duplex | UNS S31803, S32205, S32550, S32750, S32760 |
| Length & Cut Options | 3 to 6 Meters Single/Double Random Lengths, Precision Saw-Cut Billets, Center Hole Drilling |
| Heat Treatment Conditions | Annealed (A), Solution Annealed (SA), Quenched & Tempered (Q&T), Age Hardened, Strain Hardened |
Stainless Steel Round Bars Overview
Trident Metal & Alloys is one of the top Stainless Steel Round Bars Manufacturers in India. We manufacture precision-machined bright round bars and heavy forged shafts designed for high mechanical load, rotational stability, and severe operating conditions.
Engineered to yield tight dimensional accuracy and straightness, our round bars are built for direct machining into pump shafts, valves, fasteners, and hydraulic piston rods. They provide comprehensive material supply for chemical plants, marine engineering, and heavy machinery setups.
As a trusted Stainless Steel Round Bars Supplier in India, we carry ready stock ranging from 3.17 mm precision wire rods up to 350 mm heavy forged bars. Dispatched with EN 10204 3.1 Mill Test Certificates (MTCs), our products strictly satisfy global ASME, ASTM, and NACE standards.
Stainless Steel Round Bars Grades & Standards
| Alloy Grades | Series / Category | Primary Characteristics & Industrial Applications |
|---|---|---|
| 304 / 304L / 304H | Commercial Standard | Everyday rust-proof choice; easy to machine and weld for food machinery shafts, valves, and fittings. |
| 309S / 309H / 310S / 310H | Extreme Heat Resistant | Built for extreme heat up to 1150°C; prevents warping and oxidation in furnace rollers, kilns, and burner parts. |
| 316 / 316L / 316Ti | Marine & Chemical | Saltwater and chemical defender; resists deep rust pitting in boat shafts, marine hardware, and chemical valves. |
| 317 / 321 / 321H / 347 / 347H | High-Moly & Stabilized | Heat-welding specialist; titanium and niobium prevent weld decay around hot engine exhausts and chemical reactors. |
| 410 / 420 / 430 / 431 | Hardened Shaft & Utility | Super-tough, heat-treated steel built to handle heavy mechanical wear on pump shafts, cutlery, and turbine blades. |
| 440A / 440B / 440C / 444 / 446 | High-Carbon & High-Heat | Extreme hardness and wear resistance; ideal for surgical tools, high-grade bearings, and furnace components. |
| UNS S31803 / S32205 | Duplex High Strength | Double the strength of regular steel; lightweight, heavy-duty performer for offshore drive shafts and pumps. |
| S32550 / S32750 / S32760 | Super Duplex Extreme | Ultimate strength and rust defense; engineered for deep-sea drilling, gas well tools, and high-pressure valves. |
Key Advantages of Stainless Steel Round Bars
Smooth Machine Cutting & Less Tool Wear
Precision centerless grinding gives our bars perfectly round edges and tight tolerances. This means faster cutting on CNC machines, less tool breakage, and lower machine downtime for your shop.
Zero Wobble & Perfect Straightness
Peeled and polished finish removes internal strain, keeping every bar perfectly straight. Your pump shafts and rotating machinery run smooth without annoying vibrations or shaking.
Handles Heavy Loads & Sudden Shocks
Heat-treated, forged internal structure allows our round bars to handle heavy rotational twist (torque) and high mechanical stress without bending, cracking, or snapping.
Reliable in Freezing Cold & High Heat
Built to hold their shape and strength in extreme working conditions, ranging from cryogenic freezing environments (-196°C) up to intense heat (1150°C).
Complete Rust & Chemical Defense
Balanced chromium, nickel, and molybdenum content builds a self-healing barrier that keeps your parts looking clean and safe from rust, acids, and saltwater.
Quality Verification & Testing Standards
Every shipment dispatched by Trident Metal & Alloys undergoes strict multi-stage quality control to comply with project material standards:
Mill Test Certification
Fully compliant EN 10204 3.1 certification verifying heat chemistry, tensile yield, elongation, hardness, and heat treatment details.
Ultrasonic Flaw Detection
100% Ultrasonic Testing (UT) per SEP 1921 or ASTM A388 on heavy bar stock to guarantee zero internal voids, inclusions, or cracks.
Dimensional Accuracy & Straightness Audits
Micrometer and laser-scan testing ensuring diameter consistency, roundness, and straightness within 0.5 mm per meter.
Third-Party Inspection (TPI)
Independent testing managed through client-approved agencies like TUV, Bureau Veritas, SGS, DNV, and Lloyd's Register.
Regional Supply Network Across India
Western Region (Maharashtra & Gujarat)
Supplying 316L bright ground bars, 410 hardened shafts, and S32205 duplex round bars to pump manufacturers, shipyards, and valve fabricators in Mumbai, Pune, Thane, Ahmedabad, Vadodara, Rajkot, Surat, and Jamnagar.
Northern & Central Region (NCR, Punjab, UP & MP)
Distributing 304/304L cold-drawn bars and 430 stainless rods for auto components, fast-food machinery, and precision turnings across Delhi NCR, Gurgaon, Faridabad, Ghaziabad, Ludhiana, Kanpur, Indore, and Bhopal.
Southern Region (Tamil Nadu, Karnataka, Telangana & AP)
Delivering high-precision 321H, 347, and S32750 super duplex bars to aerospace machine shops, defense units, hydraulic cylinder plants, and textile machinery builders in Chennai, Coimbatore, Bengaluru, Hyderabad, Visakhapatnam, and Kochi.
Eastern Region (West Bengal, Odisha, Jharkhand & Chhattisgarh)
Bulk supply of heavy-wall 310S furnace rods and 420 forged shafts for paper mills, mining equipment, and steel plant maintenance in Kolkata, Durgapur, Jamshedpur, Rourkela, Bhilai, and Raipur.
Frequently Asked Questions
Q: What is the difference between ASTM A276 and ASTM A479 round bars?
A: ASTM A276 is for general parts and machining, while ASTM A479 is built for high-temperature and high-pressure boilers or pressure tanks.
Q: Which stainless round bar is easiest to cut and machine?
A: Grade 303 (and sulfur-treated 304) cuts the fastest with minimal tool wear, making it best for high-speed CNC machine parts.
Q: What is the maximum bar diameter available in your ready stock?
A: We stock cold-drawn bright bars starting from 3.17 mm up to heavy hot-rolled and black forged round bars up to 350 mm in diameter.
Q: Can 410 and 420 stainless steel round bars be heat treated?
A: Yes, grades 410 and 420 are martensitic alloys that can be hardened and tempered to achieve high tensile strength, wear resistance, and surface hardness for mechanical parts.
Q: Which stainless steel round bar grade is recommended for high-speed pump shafts in marine applications?
A: Marine-grade 316L or Duplex UNS S32205 round bars are ideal due to their resistance to saltwater pitting, high torsional fatigue strength, and smooth surface finish.
Q: Do you supply custom saw-cut round bar billets?
A: Yes, we provide precision band-saw cutting to deliver round bars cut to your exact length requirements with deburred ends ready for machining.
Q: What surface tolerances do you guarantee on bright bars?
A: Our bright bars are supplied in ISO h8, h9, and h11 tolerance classes depending on diameter and application requirements.
Request a Quote
Contact Trident Metal & Alloys for direct factory pricing, immediate stock availability, and technical material selection support for your stainless steel round bar requirements.
- Email Inquiries: tridentmetal96@yahoo.com
- Direct Phone / WhatsApp: +91 9619282829 / +91 9619966304
