Stainless Steel Bars (including stainless steel round bars, square bars, flat bars, hexagonal bars, and angle/channel shapes) are high-strength, corrosion-resistant metal products essential for precision CNC machining, fastener manufacturing, valve shafts, marine hardware, medical instruments, automotive components, and heavy engineering structures. Delivering superior resistance to oxidation, excellent machinability, high tensile strength, and tight dimensional tolerances, stainless steel bars are designed to meet demanding industrial and structural applications.

As a leading factory-direct manufacturer and supplier, XQJ Metal (xqjmetal.com) maintains a comprehensive inventory of premium stainless steel bars across austenitic, martensitic, ferritic, duplex, and precipitation-hardening grades—including 304, 304L, 316, 316L, 321, 310S, 410, 420, 430, 440C, 2205, and 17-4PH. Produced in strict compliance with international standards (ASTM A276, ASTM A479, EN 10088-3, JIS G4303), our stainless steel bars feature reliable internal sound quality, immaculate surface finishes, and tailored processing support.

Popular Stainless Steel Bar Profiles & Alloy Grades:

• Stainless Steel Round Bars: The most widely specified bar profile engineered for CNC turning, shaft manufacturing, bolts, and pump spindles. Available in cold-drawn precision ground finish or hot-rolled peeled/turned condition.

• Stainless Steel Hexagonal & Square Bars: Precision drawn hexagonal and square bars featuring high dimensional accuracy and sharp corners. Widely used for high-speed automatic lathe machining, nuts, fasteners, and structural frames.

• Stainless Steel Flat & Angle Bars: Rolled or sheared flat bars and L-shaped angle profiles offering excellent flexural strength, corrosion resistance, and ease of welding for brackets, supports, and decorative trim.

• Specialized & High-Strength Grades (17-4PH / 440C / Duplex 2205): Engineered for extreme environments requiring high hardness, superior wear resistance, elevated temperature strength, or marine corrosion resistance.

Technical Specifications & Parameters:

• Material Alloy Grades: Austenitic (304/304L, 316/316L, 321, 310S), Martensitic/Ferritic (410, 420, 430, 440C), Duplex (2205, 2507), PH Stainless (17-4PH / 630)

• Production Methods: Cold Drawn (CD), Hot Rolled (HR), Forged, Centerless Ground (CG), Peeled / Turned

• Diameter / Size Range: Round Bars (OD 2.0 mm – 500 mm), Hex Bars (S 4.0 mm – 100 mm), Square Bars (4×4 mm – 200×200 mm), Flat Bars (Thickness 3 mm – 50 mm)

• Surface Conditions: Black (Hot Rolled/Forged), Pickled, Bright Cold Drawn, Centerless Polished / Ground (h8, h9, h11 tolerance), Polished (180# – 600#)

• Delivery State: Annealed (A), Solution Treated (ST), Hardened & Tempered (QT), Age Hardened

• Quality Standards: ASTM A276, ASTM A479, EN 10088-3, JIS G4303, ISO 9001

Frequently Asked Questions (FAQ):

Q: What is the primary difference between cold-drawn and hot-rolled stainless steel bars?

A: Cold-drawn stainless steel bars undergo secondary processing at room temperature, resulting in tight dimensional tolerances (e.g., h8/h9), smooth bright surfaces, and higher yield strength. Hot-rolled or forged bars are processed at high temperatures and typically feature a rougher black or pickled surface with broader tolerances, making them ideal for heavy forging or re-machining.

Q: What surface finish and tolerance options does XQJ Metal offer for stainless steel round bars?

A: We provide bright cold-drawn, centerless ground, polished, turned/peeled, and hot-rolled black surfaces. For CNC automatic lathe machining, we supply high-precision centerless ground round bars with strict diameter tolerances up to h8 or h9.

Q: Do you provide custom length cutting, chamfering, and official Mill Test Certificates?

A: Yes, we offer precision CNC band saw cutting to specified lengths, end chamfering/beveling, ultrasonic flaw detection (UT), and official EN 10204 3.1 Mill Test Certificates with complete heat number traceability.

Q: What is the MOQ and standard lead time for wholesale stainless steel bar orders?

A: Our standard MOQ for stock sizes and grades is 300 kg to 1 metric ton. Standard delivery lead time for in-stock bars is 3–5 business days, while custom forged, precision ground, or special alloy orders take 10–15 business days.