Product Overview
Tool steel round bars are high-alloy and high-carbon steel stocks engineered for maximum wear resistance, compressive strength, and dimensional stability under thermal stress. Supplied in an annealed condition for subsequent machining, our round bars undergo strict metallurgical control-from electric arc furnace (EAF) melting and ladle refining (LF) to vacuum degassing (VD) and precise forging reduction. Every heat lot maintains a refined carbide structure and low inclusion ratings for demanding mold, die, and tooling operations.
Technical Specifications
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Standard Grades |
AISI D2 (1.2379), H13 (1.2344), P20 (1.2311 / 1.2738), O1 (1.2510), S7 (1.2357), M2 (1.3343) |
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Diameter Range |
Phi 10 mm to Phi 500 mm (custom forging up to Phi 800 mm) |
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Length |
Standard 2,000 to 6,000 mm or cut-to-size per specification |
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Delivery Condition |
Soft annealed (Hardness typically max 255 HB depending on grade) |
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Surface Finish |
Black / Hot rolled, Peeled (K12), Turned, or Centerless Ground (h9 / h10) |
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Straightness |
Max 1.5 mm/m (precision ground bars max 0.5 mm/m) |
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Manufacturing Standards |
ASTM A681, DIN EN ISO 4957, JIS G4404 |
Product Advantages
Optimized Carbides: Controlled forging reduction ratios ensure uniform carbide distribution, preventing premature chipping or edge collapse during high-speed machining and stamping.
Low Inclusion Profile: Vacuum degassing (VD) and secondary refining maintain sulfur and phosphorus levels below 0.015 percent, mitigating internal cracking risks during vacuum quenching.
Precision Tolerances: Peeling and turning lines maintain tight diameter tolerances with positive machining allowances, reducing rough-machining time for tool shops.
Full Traceability: Permanent heat stamping and individual bar color-coding cross-referenced directly to mill test certificates.
Applications
Cold Work Dies:
Blanking dies, trimming dies, thread rolling dies, and cold extrusion punches (Grade: D2, O1, S7).
Hot Work Tooling:
Aluminum extrusion dies, die-casting inserts, forging dies, and hot shear blades (Grade: H13).
Plastic Mold Bases:
Injection mold cavities, bolster plates, and structural mold frames requiring high polishability (Grade: P20, 1.2738).
Wear-Resistant Components:
Industrial shear blades, wear plates, precision spindles, and slitters.
Customization & Processing
Cutting Services: In-house horizontal band saws provide exact slice cutting or block sizing, maintaining length tolerances within plus/minus 1.0 mm.
Forging Capability: Custom open-die forging services for non-standard diameters or specialized cross-sections up to 5-ton ingot equivalents.
Rough Machining: Surface peeling, rough turning, and milling services available to remove outer decarburization layers prior to dispatch.
Quality Control & Inspection
Production processing integrates rigorous testing protocols across every individual batch:
Chemical Analysis:
Spectrometric composition verification per ladle sample.
Metallurgical Evaluation:
Microstructure analysis verifying grain size (ASTM E112), carbide network uniformity, and decarburization depth.
Hardness Testing:
Brinell (HB) verification performed on both ends of each bar.
Nondestructive Testing (NDT):
100 percent ultrasonic testing (UT) performed per SEP 1921 Class C/c or ASTM A388 to guarantee internal soundness and verify the absence of shrink cavities or internal micro-cracks.
Documentation:
EN 10204 3.1 Mill Test Report supplied standard with every shipment.
Packaging & Shipping
Protection: Bars are coated with industrial-grade rust-preventative anti-corrosion oil and bundled with high-tensile steel strapping.
Marking: Each bundle carries weather-resistant metal tags displaying Steel Grade, Heat Number, Dimensions, Lot Number, and Net/Gross Weight.
Packaging Form: Bundles secured with wooden spacers for container stuffing; heavy-duty wooden crating utilized for precision ground bars or export shipments.
FAQ
Q: What is the standard delivery condition of the tool steel round bars?
A: Bars are delivered in the soft annealed condition to ensure optimal machinability prior to final heat treatment by the end user.
Q: Do you provide Ultrasonic Testing (UT) reports with the material?
A: Yes. 100 percent ultrasonic testing is conducted on bars above Phi 50 mm, and inspection results are fully documented in the EN 10204 3.1 test certificate.
Q: What is the typical machining allowance for peeled or turned bars?
A: Diameters are processed with positive machining allowances (typically plus 0.5 mm to plus 3.0 mm depending on bar size) to clean up outer surface imperfections.
Q: Can you supply custom cut lengths instead of full production lengths?
A: Yes. In-house cold sawing supports precise cut-to-length requirements, minimizing raw material scrap for machine shops.
Q: What is your minimum order quantity (MOQ) for non-standard grades?
A: MOQ depends on rolling or forging schedules, typically starting at 1,000 kg per dimension for custom melts or non-stock specifications.
Q: How do you prevent rust during ocean freight?
A: Bars receive a heavy-duty rust inhibitor coating, moisture barrier wrapping, and secure container placement with commercial desiccants.
Request a Quote
Specify steel grade, diameter, length, quantity, and required delivery terms to receive a formal quotation with mill test verification data within 24 hours.
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