Hot Rolled Carbon Steel Rod Ideal for Industrial Equipment and Metalworking Applications

• Customization: Available
• After-sales Service: Online 24/7
• Warranty: Contact Supplier
• Type: Carbon Steel Bar
• Standard: AISI, ASTM, GB, JIS, DIN
• Technique: Hot Rolled
• Application: Structural Steel Bar, Tool Steel Bar, Die Steel Bar
• Surface Treatment: Non-Treatment
• Alloy: Alloy
• Special Use: Mold Steel, Free Cutting Steel, Cold Heading Steel
• Transport Package: Bundling: Iron Straps.
• Specification: Low Carbon, Medium Carbon, High Carbon
• Trademark: Zunkai
• Origin: China
• HS Code: 72141000
• Production Capacity: 50000ton/Year

Product Description

1. Product Overview

Carbon steel round bars are widely used for mechanical components, structural applications, and manufacturing billets. They are categorized by processing method, size, and carbon content:
Material: Carbon Steel, Alloy Steel, etc.
Processing Techniques: Hot Rolled, Cold Rolled, Cold Drawn, ERW, SSAW, Forged, etc.
Surface: Black, Natural, Galvanized, Painted, Oiled, Chrome Coated, etc.
Standard: DIN, EN, GB, ISO, JIS, BA, ANSI
Grade: Q195, Q235, 10#, 20#, 35#, 45#, Q215, Q345, 12Cr1Mov, 15CrMo, 304, 316, 20Cr, 40Cr, 20CrMo, 35CrMo, 42CrMo, 40CrNiMo, GCr15, 65Mn, 50Mn, 50Cr, 3Cr2W8V, 20CrMnTi, 5CrMnMo
Shapes Available: Round, Square, Rectangular, Oval, Special Shapes upon Request

2. Dimensional Ranges

Conventional range: Φ5mm-Φ500mm (small diameters are used for gears and pins, large diameters are used for machine tool spindles and heavy machinery shafts);

Length: Fixed lengths (e.g., 6m, 9m, suitable for transportation and batch processing), custom lengths (3m-12m, cut to order), and multiple lengths (supplying multiples of customer part sizes to reduce scrap);

Shape	Hot Rolled	Cold Drawn	Forged
Round	20 mm – 300 mm	16 mm – 70 mm	250 mm – 800 mm
Square	20×20 mm – 130×130 mm	10×10 mm – 80×80 mm	Custom
Flat	Thickness: 12–100 mm Width: 20–150 mm	Thickness: 6–70 mm Width: 16–80 mm	Custom

Diameter & Length Specifications:

Diameter: Φ5 mm – Φ500 mm (small diameters for gears/pins, large for shafts/spindles)

Length: Standard (6 m, 9 m), Custom (3–12 m), Multiple lengths to reduce scrap

Precision Grade: Standard (h11 GB/T 3077), Precision (h8/h9 for high-accuracy parts like bearings)

3. Surface Appearance

Hot Rolled (Black Leather Surface): Dark brown oxide scale; requires cutting/pickling; cost-effective.

Cold Drawn Surface: High surface finish (Ra ≤ 1.6 μm); high dimensional accuracy; suitable for rough machining of precision parts.

Polished Surface: Ra ≤ 0.8 μm; for high-finish applications like hydraulic shafts.

General Requirements: Smooth, free of cracks, folds, or scars.

4. Processing & Heat Treatment

This street light features high brightness, energy saving, environmental protection, and easy installation. It has a waterproof rating of IP67 and has passed CE certification. It is suitable for schools, parks, roadsides, factories, squares, etc. It has a warranty period of 3 years. Moreover, we can provide various styles to meet your needs.

Process	Description	Characteristics / Applications
Hot Rolled (HR)	High-temp rolling + natural cooling	Good plasticity, easy machining, uneven internal structure, may require heat treatment
Cold Drawn (CD)	Cold-drawn after hot rolling	High dimensional accuracy, improved surface hardness, may require annealing
Annealed	High-temp annealing (600–800°C)	Relieves internal stress, reduces hardness, improves toughness; suitable for forging/bending
Quenched & Tempered	Quenching + high-temp tempering	Balanced high strength & toughness; direct use in load-bearing components (e.g., 45CrNiMoVA tensile ≥1200 MPa, elongation ≥10%)

5. Special Grades & Applications

Grade	Main Chemical Composition	Performance	Typical Applications
40Cr	Cr 0.8–1.1%	Medium strength, good toughness, hardenability	Machine tool spindles, axles, gears, high-strength bolts
42CrMo	Cr 0.9–1.2%, Mo 0.15–0.25%	High strength, toughness, hardenability, high-temp resistance (up to 300°C)	Rolling mill spindles, engine crankshafts, hydraulic supports
20CrMnTi	Cr 1.0–1.3%, Mn 1.1–1.4%, Ti 0.04–0.10%	High surface hardness after carburizing, core toughness	Automotive gears, camshafts
35CrMo	Cr 0.8–1.1%, Mo 0.15–0.25%	Good toughness, weldable	Oil drill pipes, high-pressure pipelines, welded structural parts
45CrNiMoVA	Cr 0.8–1.1%, Ni 1.3–1.8%, Mo 0.2–0.3%, V 0.1–0.2%	Ultra-high strength, high toughness, fatigue resistance	Aircraft landing gear, heavy tank track shafts, high-strength machine tools
20Cr	Cr 0.7–1.0%	Low alloy, surface wear resistance after carburizing	Medium-performance parts, cost-effective alternative to 20CrMnTi

6. Applications

Building construction, automobile, shipbuilding, machinery, petrochemical, medicine, food, energy, power plants, space, decoration.
Manufacturing of mould templates, mortise pins, columns.
Structural parts under stress alternation, such as connecting rods, bolts, wheel gears.
Common blanks and shaft materials; die welding model: CMC-E45.

7. Packaging & Shipping

Surface coated with oil to prevent rust.

Bundled with iron straps; weight per bundle: 2–3 MT.

Two or three tags per bundle indicating: Product Description, Heat No., Steel Grade, Size, NR, Weight, Date, Origin.

Custom packaging available per customer requirements.

8. Delivery Time

Standard: 8–14 days, depending on quantity and order specifications.

FAQ

1. How can I get a quotation from you?
You can leave us a message, and we will reply to every message in time. You may also communicate with us online via TradeManager. Additionally, our contact information is available on the contact page.

2. Can I get samples before placing an order?
Yes, of course. Usually, our samples are free. We can produce samples according to your specifications, technical drawings, or requirements. We can also build molds and fixtures if needed.

3. What is your delivery time?
The usual delivery time is about 1 month for a 40FT container. If we have stock available, we can arrange shipment within 2 days.

4. What are your payment terms?
Our standard payment term is 30% deposit, with the balance payable against the Bill of Lading. L/C is also acceptable. We support EXW, FOB, CFR, CIF, and DDU terms.

5. How can you guarantee the quality of your products?
We are a factory with 100% pre-delivery inspection to ensure product quality.

6. How do you maintain long-term and good business relationships?

We provide high-quality products at competitive prices to ensure our customers' benefit.
We treat every customer as a friend and sincerely do business while building lasting relationships.