Product Overview
Hot-rolled and cold-drawn stainless steel square bars supplied in standard and custom lengths. Produced via precision rolling or cold drawing followed by solution annealing, intended for CNC machining, structural components, and corrosion-resistant fasteners. Each production lot is backed by verifiable material test reports meeting ASTM, AISI, and EN standards.
Technical Specifications
|
Parameter |
Specification Details |
|
Standard Grades |
Austenitic: 304/304L, 316/316L, 310S, 321 Martensitic & Precipitation Hardening: 410, 420, 17-4PH (Grade 630) |
|
Production Method |
Hot Rolled (Annealed & Pickled), Cold Drawn, Centerless Ground |
|
Size Range |
3 mm to 100 mm (1/8 inch to 4 inches) |
|
Length Options |
Standard 3m / 5.8m / 6m or custom cut-to-length (±2 mm) |
|
Dimensional Tolerance |
Cold Drawn: h11 / h12; Hot Rolled: ASTM A484 / EN 10058 |
|
Surface Finish |
Pickled (No. 1), Cold Drawn Bright, Centerless Ground & Polished (Ra <= 0.8 um) |
|
Straightness |
Max 1.5 mm per 1000 mm |
|
Applicable Standards |
ASTM A276, ASTM A484, EN 10088-3, JIS G4303 |
Product Advantages
Optimized Machinability:
Controlled sulfur addition options and uniform microstructures minimize tool wear during high-speed CNC milling and turning operations.
Low Internal Stress:
Multi-stage cold drawing combined with stress-relief annealing prevents material warping or dimensional drift during deep pocket milling.
Traceable Metallurgy:
Primary steel mill sources (TISCO, Tsingshan, POSCO) ensure strict chemical composition control within strict ASTM/EN limits.
Strict Dimensional Consistency:
Die-sizing technology maintains tight cross-sectional tolerances, reducing secondary grinding setup times.
Applications
CNC Machined Components: Valve stems, gears, shafts, and hydraulic fittings requiring uniform mechanical strength.
Industrial Fasteners: High-strength bolts, nuts, and threaded studs deployed in corrosive environments.
Food & Pharmaceutical Equipment: Structural frames, guide rails, and conveyor brackets compliant with hygiene standards.
Marine & Chemical Processing: Pump shafts, valve bodies, and structural brackets exposed to chloride or acid corrosion.
Customization & Processing
Dimensional Customization:
Non-standard metric and imperial sizes produced via dedicated roller dies or precision cold drawing.
Cutting Services:
High-speed band saw cutting with burr-free edges and tight length tolerances for direct-to-assembly delivery.
Tailored Heat Treatment:
Solution annealing, stress relieving, or precipitation hardening (H1025, H1150) executed in-house to achieve target hardness (Rc or HB).
Surface Processing:
Centerless grinding and polishing services to achieve specific surface roughness metrics for sliding components.
Quality Control & Inspection
Chemical Verification: Direct-reading optical emission spectrometer (OES) analyzes every heat number prior to processing.
Dimensional Auditing: Laser micrometers and digital calipers monitor cross-sectional dimensions continuously during cold drawing.
Mechanical Testing: Tensile strength, yield strength, elongation, and Brinell/Rockwell hardness verified per lot.
Non-Destructive Testing: Eddy current testing applied to bright bars to detect surface seams, laps, and internal inclusions.
Documentation: EN 10204 3.1 Mill Test Certificates provided with every shipment.
Packaging & Shipping
Bundle Protection:
Bars bundled with heavy-duty steel strapping, wrapped in moisture-resistant woven plastic fabric, and reinforced with wooden spacers to prevent transit bending.
Export Crating:
Fumigated wooden boxes or heavy-duty iron frames utilized for sea freight of precision-ground or polished bars.
Identification:
Each bundle tagged with stainless steel metal nameplates indicating Grade, Heat No., Size, Length, and Net Weight.
FAQ
Q: What is the minimum order quantity (MOQ) for custom-sized stainless steel square bars?
A: MOQ depends on the grade and dimensions. Standard stock sizes have no MOQ. For non-standard dimensions or specific length cutting, the typical MOQ starts at 500 kg per size to account for die setup and rolling adjustments.
Q: Are EN 10204 3.1 Test Certificates provided with shipments?
A: Yes. Every delivery includes a 3.1 mill test certificate detailing actual chemical composition, mechanical properties, and heat treatment logs traceable to the original steel melt.
Q: How do you prevent stainless steel bars from bending during long-distance ocean shipping?
A: Bars are bundled securely with wooden dunnage at regular intervals to distribute weight evenly, enclosed in waterproof wrapping, and loaded into container floors with secure blocking to eliminate transit shifting.
Q: What is the difference between cold-drawn and hot-rolled square bars in machining?
A: Hot-rolled bars feature a scaled surface and looser dimensional tolerances, suited for general structural fabrication. Cold-drawn bars offer tighter tolerances (h11), brighter surface finishes, higher yield strength, and reduced machining allowances.
Q: Can you supply material processed to specific hardness levels or temper conditions?
A: Yes. Solution-annealed, strain-hardened (e.g., 1/4 hard, 1/2 hard), or precipitation-hardened (17-4PH H1150) bars are available based on mechanical requirement specifications.
Q: What is your standard production lead time for out-of-stock dimensions?
A: Production lead times range from 15 to 25 days depending on the rolling schedule, grade availability, and required secondary processing like centerless grinding or custom heat treatment.
Request a Quote
Specify grade, dimensions, quantity, and required delivery terms to receive a formal quotation with mill test verification within 24 hours.
Email:ellie_dong@126.com
Required RFQ Details: Grade (e.g., 316L) | Size (e.g., 25 mm x 25 mm) | Length | Quantity (Kg/Pcs) | Destination Port
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