Hot Rolled Steel Bar

Product Overview

Hot Rolled Steel Bar is produced by rolling steel at temperatures above its recrystallization point, typically exceeding 1,700°F (925°C). This thermal process yields a malleable material easily shaped into standard rounds, flats, squares, and hexagons. Designed for high-volume industrial conversion, our hot rolled bars serve as foundational stock for machining, forging, and structural fabrication. We maintain dedicated rolling schedules for carbon and alloy grades, ensuring stable mechanical performance and consistent metallurgical properties across every heat.

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Technical Specifications

Available Grades:
• Carbon Steel: AISI 1018, 1020, 1045, 1050
• Alloy Steel: AISI 4140, 4340, 8620
• European Standards: S235JR, S355JR, C45E, 42CrMo4

Shape Profiles: Round, Flat, Square, Hexagon

Size Range:
• Rounds: Diameter 16mm - 320mm
• Flats: Thickness 10mm - 100mm, Width 50mm - 300mm

Standard Lengths: 3m, 5.8m, 6m, 12m, or cut-to-length per specification

Execution Standards: ASTM A29, EN 10060, JIS G3101, GB/T 702

Surface Condition: As-rolled, black, shot-blasted, or peeled/turned

Product Advantages

Uniform Grain Structure:

High-temperature rolling eliminates internal voids and homogenizes the crystalline structure, improving overall toughness.

Controlled Hardening Response:

Precise carbon and alloy chemistry ensures predictable response during subsequent heat treatment processes like quenching and tempering.

Tight Dimensional Tolerances:

Utilizing modern rolling mills and in-line laser measurement systems, diameter variations are kept within strict commercial limits.

In-House Manufacturing Capacity:

Operating 3 continuous rolling lines and induction heating furnaces with an annual output of 300,000 metric tons, ensuring stable supply lead times for bulk orders.

Applications

Machined Components:

Shafts, gears, spindles, and pins processed via CNC turning and milling.

Heavy Machinery:

Structural frames, chassis components, and support brackets for construction and mining equipment.

Automotive Sector:

Steering knuckles, axle shafts, and transmission components.

Fasteners & Hardware:

Industrial bolts, studs, anchors, and rigging hardware.

Customization & Processing

01/

Cutting Services: Saw cutting and flame cutting to exact end-user production lengths with squareness tolerances within +/-1mm.

02/

Heat Treatment: Annealing, normalizing, and quench-and-tempering (Q&T) performed on-site to achieve specific tensile strength and hardness brackets.

03/

Surface Preparation: Shot blasting to remove mill scale, followed by application of anti-rust oil or temporary protective coatings.

04/

Special Profiles: Custom cross-sections developed through dedicated die engineering for specialized OEM requirements.

Quality Control & Inspection

Chemical Analysis:

Spectrometer testing per heat prior to rolling to verify carbon, manganese, chromium, and trace element percentages.

Mechanical Testing:

Tensile testing, Charpy V-notch impact testing, and Brinell/Rockwell hardness testing conducted on test coupons from each batch.

Nondestructive Testing:

Ultrasonic testing (UT) per ASTM A388 or EN 10308 available to detect internal inclusions or discontinuities in critical alloy bars.

Dimensional Verification:

100% optical laser gauge monitoring during production, supplemented by vernier caliper and micrometer spot-checks by QA personnel.

Traceability:

Heat numbers and grade stamps hard-die-stamped or tagged on every bundle, mapped directly to Mill Test Certificates (MTC) conforming to EN 10204 3.1.

Packaging & Shipping

Bundle Configuration: Bars secured with high-strength steel strapping at minimum 4-6 intervals per length to prevent shifting during transit.

Lifting Safety: Bundles equipped with balanced lifting slings or wooden skids to facilitate safe overhead crane and forklift handling at port and warehouse.

Corrosion Protection: VCI (Volatile Corrosion Inhibitor) plastic wrapping and heavy-duty woven polypropylene outer covers applied for ocean freight shipments.

Logistics Support: Direct container loading (20GP/40GP) from mill siding or break-bulk vessel chartering for large tonnage parcels under flexible international trade terms (FOB, CFR, CIF).

FAQ & Request a Quote

Q: What is the standard minimum order quantity (MOQ) for custom grades?

A: The baseline MOQ is 10 metric tons per size/grade for standard rolling schedules. Smaller trial orders may be accommodated from existing stock inventory.

Q: Are Mill Test Certificates provided with the shipment?

A: Yes. An EN 10204 3.1 Mill Test Certificate detailing chemical composition and mechanical test results is transmitted digitally prior to dispatch and shipped with the documentation pouch.

Q: Can you supply bars cut to precise custom lengths?

A: Yes. Our saw-cutting facility processes lengths down to +/-1mm tolerance to minimize your scrap rate during component machining.

Q: What surface finish can I expect on as-rolled bars?

A: Standard as-rolled bars feature a dark oxide mill scale. Shot-blasting or mechanical peeling/turning is available to achieve a scale-free, bright surface.

Q: How do you prevent rust during ocean transit?

A: All bundles are coated with water-displacement rust preventative oil, wrapped in VCI film, and secured inside moisture-barrier containers or protected with weather-resistant tarpaulins for break-bulk shipping.

Q: What is the typical lead time for production orders?

A: Standard production cycles take 20 to 30 days, depending on mill rolling schedules and required heat treatment or testing procedures.

Request a Quote

To receive a formal quotation aligned with your commercial and logistics requirements, please provide the following parameters:
• Steel grade (e.g., AISI 1045, 4140)
• Shape and dimensions (Diameter, thickness, width)
• Required quantity (Metric tons or pieces)
• Length requirements (Standard 6m/12m or cut-to-length)
• Surface finish and testing requirements (e.g., UT testing, Q&T)
• Preferred Incoterms (e.g., FOB Qingdao, CIF destination port)

As one of the most professional hot rolled steel bar manufacturers and suppliers in China, we're featured by quality products and low price. Please rest assured to buy high-grade hot rolled steel bar in stock here from our factory.