Product Overview
Tool Steel Hexagonal Bars are precision-engineered alloy steel profiles designed for high compressive strength, wear resistance, and dimensional stability in tooling applications. Manufactured using standard international grades such as AISI D2, O1, H13, and A2, these bars undergo controlled rolling, cold drawing, or precision grinding to reduce machining allowances for tool and die makers.
The manufacturing process combines electric arc melting, ESR (Electro-Slag Remelting) refining, and atmosphere-controlled annealing under ISO 9001 and IATF 16949 certified quality management systems. This sequence establishes uniform carbide distribution, prevents surface decarburization, and ensures consistent response during subsequent heat treatment.
Technical Specifications
|
Parameter |
Specification Details |
|
Standard Grades |
AISI D2 / 1.2379, AISI O1 / 1.2510, AISI H13 / 1.2344, AISI A2 / 1.2363 |
|
Size Range (Across Flats) |
8 mm to 60 mm (±0.05 mm tolerance available) |
|
Delivery Condition |
Soft annealed (< 250 HB), cold drawn, centerless ground |
|
Standard Lengths |
3000 mm to 6000 mm (Custom cutting available) |
|
Surface Finish |
Cold drawn, polished, or peeled; Ra ≤ 1.6 μm |
|
Straightness |
≤ 0.5 mm/m (Max deviation) |
Product Advantages
Carbide Uniformity:
ESR-refined variants exhibit minimal micro-segregation, preventing edge chipping during high-speed blanking and stamping operations.
Tight Dimensional Control:
Cold-drawn hexagonal tolerances adhere to ISO h9/h11 standards, shortening setup times on CNC multi-axis lathes.
Controlled Carbon Potential:
Annealing in sealed, nitrogen-purged pit furnaces maintains surface carbon balance within ±0.02%, avoiding soft skin layers.
Traceable Documentation:
Each bar is stamped with its specific heat number, linking directly to a downloadable EN 10204 3.1 Mill Test Certificate.
Applications
Cold Work Dies & Punches: Stamping dies, blanking tools, and thread-rolling components requiring high abrasion resistance (Grade D2).
Machining Tooling: Collets, guide pins, ejector pins, sockets, and multi-faceted drive components.
Shearing Blades: Industrial cutting knives and guillotine blades operating under cyclic mechanical fatigue.
Hot Work Components: Extrusion inserts and forging dies maintaining structural integrity at elevated service temperatures (Grade H13).
Customization & Processing
Non-standard across-flat dimensions and tight tolerance bands (±0.025 mm) produced via dedicated cold-drawing dies.
Pre-machining soft annealing, stress-relieving, or spherical annealing matched to specific downstream machining workflows.
High-precision band saw cutting yielding square ends, deburred edges, and color-coded grade identification.
Quality Control & Inspection
Production is governed by ASTM, EN, and JIS standards, supported by an on-site metallurgical testing laboratory operating under ISO/IEC 17025 accredited procedures:
Chemical Composition: Spectrometric analysis performed on every ladle pour.
Internal Integrity: 100% ultrasonic testing (UT) executed per SEP 1921 to identify internal micro-voids and inclusions.
Decarburization Depth: Metallographic microscopic examination conducted to verify zero surface carbon loss.
Hardness Testing: Brinell and Rockwell hardness measurements verified on both extremities of every production batch.
Packaging & Shipping
Corrosion Protection:
Bars receive an application of rust-preventive oil, are secured into heavy-duty steel bundles, and are enclosed in moisture-resistant woven plastic sheeting.
Export Bundling:
Hexagonal bundles are packed into rigid wooden crates or secured with timber spacers for secure LCL/FCL ocean freight or air transit.
Identification:
Waterproof metal tags affixed to each bundle indicate the steel grade, heat number, dimensions, net/gross weight, and internal lot code.
FAQ
Q: What is the minimum order quantity (MOQ) for non-standard hexagonal sizes?
A: MOQ depends on the specific steel grade and across-flat dimension, generally starting at 500 kg per size when aligned with active mill rolling schedules. Standard stock grades are available for lower trial volumes.
Q: Do you supply EN 10204 3.1 Test Reports with the shipment?
A: Yes. Every delivery includes a traceable 3.1 mill certificate detailing actual ladle chemical analysis, mechanical property test results, hardness values, and UT inspection compliance.
Q: How is decarburization prevented during the annealing process?
A: Annealing takes place in sealed pit furnaces utilizing automated carbon-potential sensors and a controlled nitrogen atmosphere to maintain surface chemistry.
Q: Can these hexagonal bars be supplied in a pre-hardened condition?
A: Standard stock is delivered in a soft-annealed state for optimal machinability. Pre-hardened deliveries (e.g., 30–40 HRC) require custom quenching and tempering runs based on project requirements.
Q: What is the standard delivery lead time for regular stock items?
A: Ex-stock orders dispatch within 5 to 7 working days. Custom cold-drawn or milled production runs require 25 to 35 days depending on raw material availability and mill scheduling.
Q: What ports do you typically ship from?
A: Shipments are dispatched from major Chinese export hubs, primarily Shanghai, Ningbo, and Tianjin, using seaworthy break-bulk or containerized configurations.
Request a Quote
Submit technical requirements below to receive a formal quotation within 24 hours. Please specify the steel grade, across-flat dimension, order quantity, and destination port.
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