Product Overview
Tool steel square bars provide raw stock material optimized for high wear resistance, compressive strength, and dimensional stability under thermal stress. Supplied in hot-rolled, forged, or cold-drawn conditions, these bars serve as the structural base for industrial dies, molds, and high-stress machine parts. Production operations utilize electric arc furnaces (EAF) and vacuum degassing (VD) to ensure microstructural cleanliness across standard industrial grades including AISI D2, H13, O1, and A2.
Technical Specifications
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Available Grades |
AISI D2 (1.2379 / SKD11), AISI H13 (1.2344 / SKD61), AISI O1 (1.2510), AISI A2 (1.2363). |
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Size Range |
Width / Thickness: 10 mm to 300 mm. |
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Length |
Standard 2,000 mm – 5,800 mm or custom cut-to-length. |
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Delivery Condition |
Soft annealed (HB <= 250), pre-hardened, or quenched and tempered. |
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Surface Finish |
Black surface, rough machined, peel-turned, or precision ground (tolerance up to +/- 0.05 mm). |
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Dimensional Tolerances |
Hot-rolled per ASTM A6 / EN 10059; Cold-drawn / Ground per ISO h9-h11. |
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Standard Certifications |
EN 10204 3.1 Mill Test Certificate included (chemical analysis, hardness, grain size, ultrasonic test results). |
Product Advantages
Carbide Distribution:
Controlled forging reduction ratios minimize carbide segregation, reducing premature edge chipping in cutting tools.
Machinability:
Uniform spheroidized annealing structure ensures consistent tool life during rough milling and drilling before final heat treatment.
Dimensional Stability:
Vacuum degassing and strict temperature control during thermal processing reduce distortion risks during quenching and tempering.
Inclusion Control:
Secondary refining (LF+VD) limits sulfur and phosphorus levels, achieving macro-cleanliness levels meeting ASTM E45 standards.
Applications
Cold Work Dies: Blanking dies, trimming dies, thread rolling dies, and cold extrusion punches (primarily AISI D2 and A2).
Hot Work Tooling: Aluminum extrusion stems, die-casting inserts, forging dies, and hot shear blades (primarily AISI H13).
General Tooling: Shear blades, gauge blocks, guide pins, ejector pins, and heavy-duty machine spindles (primarily AISI O1).
Customization & Processing
In-house high-speed band saws capable of cutting square bars up to 500 mm with squareness tolerances within 0.5 mm.
Surface milling and grinding remove decarb layers, supplying net-shape or near-net-shape bars to reduce shop floor setup time.
Custom hardening and tempering services available upon request to achieve specific working hardness (e.g., 58-62 HRC for D2).
Quality Control & Inspection
Chemical Analysis: Spectrometric testing verifies melt chemistry against ASTM/DIN standards prior to shipment.
Non-Destructive Testing (NDT): 100% ultrasonic testing (UT) performed on bars exceeding 50 mm thickness per SEP 1921 Class C/c to detect internal voids, cracks, or shrinkage.
Hardness Testing: Brinell and Rockwell hardness testing performed on both ends of every bar to verify annealing uniformity.
Packaging & Shipping
Rust Prevention:
Coated with anti-rust oil and wrapped in moisture-resistant vapor corrosion inhibitor (VCI) film.
Bundling:
Secured with steel strapping and wooden spacers to prevent shifting during transit.
Export Packaging:
Packed in heavy-duty wooden crates or waterproof reinforced wooden pallets suitable for ocean and air freight.
FAQ
Q: What is the standard delivery condition of the square bars?
A: Most bars are supplied in the soft annealed condition to facilitate subsequent machining by the end user, unless pre-hardened stock is specifically requested.
Q: Do you provide Mill Test Certificates (MTC) with each shipment?
A: Yes. Every order includes an EN 10204 3.1 certificate detailing actual heat chemistry, hardness test results, and ultrasonic inspection reports.
Q: Can you supply non-standard sizes or custom-cut lengths?
A: Yes. We offer precision band-saw cutting to specific lengths and rough machining or grinding to customized cross-section dimensions.
Q: What is your minimum order quantity (MOQ) for custom steel grades?
A: MOQ depends on the specific grade and dimensions. For standard sizes in AISI D2 and H13, trial orders starting at 500 kg are accepted.
Q: How do you prevent surface decarburization during processing?
A: Thermal processing utilizes controlled-atmosphere furnaces and protective scaling layers, followed by mechanical peeling or grinding to completely remove any remaining decarb zone.
Q: What is the typical lead time for standard versus cut-to-size orders?
A: Standard stock items ship within 5 to 7 business days. Custom-cut or pre-machined orders require 10 to 15 business days depending on processing volume.
Request a Quote
Submit your required steel grade, dimensions, quantity, and processing specifications to receive a formal quotation with mill test verification and shipping terms.
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