Product Overview
Industrial & Machining Grade Stainless Steel Bars
Qiaodi Steel is a premier manufacturer and exporter of stainless steel bars, rods, and structural profiles. Based in Wuxi—the center of China’s stainless steel processing industry—we supply high-purity bar stock engineered for precision CNC machining, forging, shaft manufacturing, and industrial framework construction.
Our bars are produced and tested in compliance with strict international standards, including ASTM A276, ASTM A479, EN 10088-3, and JIS G4303. Whether you require bright cold-drawn round bars with h9 tolerance for high-speed machining, centerless ground rods, or heavy hot-rolled peeled bars, we deliver complete material traceability and precision cut-to-length services.
Bar Shapes & Profiles
- 01 / Round Bars & Rods (Bright Cold Drawn / Peeled / Black)
- Overview: The most versatile bar profile. Available in cold-drawn bright finish, turned/peeled finish, or centerless ground finish for high-precision CNC turning.
- Applications: Pump shafts, valve stems, fasteners, automotive parts, and motor shafts.
- 02 / Hexagonal Bars (Hex Bars)
- Overview: Cold-drawn hexagonal profile providing uniform geometric accuracy and high yield strength.
- Applications: Nuts, bolts, threaded pipe fittings, hydraulic connectors, and machining components.
- 03 / Square & Flat Bars
- Overview: Precision square and flat rectangular bars with sharp, clean edges and smooth surface finishes.
- Applications: Structural frameworks, machine beds, key stock, brackets, and architectural trims.
- 04 / Structural Angles & Channel Profiles
- Overview: Hot-rolled and laser-welded stainless steel angle irons and channels designed for heavy load-bearing applications.
- Applications: Marine structures, chemical plant infrastructure, and architectural frameworks.
Technical Specifications & Dimensions
Headline: Technical Specifications & Manufacturing Range
| Profile Type | Dimension Range | Surface Finishes & Tolerances | Common Material Grades |
| Round Bars | $\varnothing 3.0\text{ mm} – \varnothing 400\text{ mm}$ | Cold Drawn (h8, h9, h11), Peeled/Peeled Turned (k12, h11), Black | 303, 304/304L, 316/316L, 310S, 410, 416, 420, 17-4PH |
| Hexagonal Bars | $H 4.0\text{ mm} – H 80\text{ mm}$ | Cold Drawn Bright (h10, h11) | 303, 304/304L, 316/316L, 312 |
| Square Bars | $4.0\text{ mm} \times 4.0\text{ mm} – 100\text{ mm} \times 100\text{ mm}$ | Cold Drawn, Hot Rolled Acid Pickled | 304/304L, 316/316L, 310S |
| Flat Bars | $3\text{ mm} \times 12\text{ mm} – 25\text{ mm} \times 150\text{ mm}$ | Cold Drawn, Sheared & Edge Processed, Hot Rolled | 304/304L, 316/316L |
| Standards | ASTM A276, ASTM A479, EN 10088-3, JIS G4303, GB/T 1220 | ||
| Processing | Precision Saw Cutting, Centerless Grinding, Chamfering, Heat Treatment (Solution Annealed, Q&T) |
Free-Machining & Special Alloy Options
- Free-Machining Grade 303 & 416: Sulfur-added stainless steel engineered specifically for automatic screw machines and high-speed CNC turning, providing superior chip breaking and longer tool life.
- High-Strength Precipitation Hardening (17-4PH / 630): Combines high mechanical strength and hardness with good corrosion resistance for critical aerospace and valve components.
- Duplex Stainless Steel (2205 / 2507 Bar): Outstanding resistance to chloride pitting and stress corrosion for offshore and chemical plant equipment.
Quality Assurance & Mill Certification
- 100% Ultrasonic Testing (UT): Internal flaw detection for heavy-diameter round bars to guarantee internal soundness before machining.
- Dimensional & Straightness Inspection: Guaranteed straightness tolerance ($< 1.0\text{ mm/m}$) for smooth automated machine feeding.
- Full Certification: Supplied with EN 10204 3.1 Mill Test Certificates (MTC) confirming exact chemical compositions, tensile strength, yield strength, and hardness values (HB/HRC).