Carbon Steel Rolled Forged Rolled Bars China Alloy Steel Round Bars

Short Description:

Carbon Steel Forged Rolled Bars are industry leading steel products that are made processes rolling and forging to provide strength, toughness with the high dimensional accuracy.

Model Number: AISI 4140, 4340, 1045

Standard: AISI

Technique: Hot Rolled

Yield Strength: 1045: Yield ≥ 310 MPa,4140: Yield ≥ 415 MPa,4340: Yield ≥ 470 MPa

Tensile Strength: 1045:Tensile ≥ 585 MPa,4140:Tensile ≥ 850 MPa,4340:Tensile ≥ 930 MPa

Length: 6 m, 12 m, or custom cut lengths

Applications: Applications Structural supports, steel frameworks, machinery parts, base plates, brackets, construction and fabrication projects

Certification: ISO

Delivery Time: 7–15 days depending on order quantity

Payment Terms: T/T: 30% deposit + 70% balance before shipment

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Product Detail

Product Tags

Product Detail

Item	Details
Product Name	AISI 4140 / 4340 / 1045 Hot Forged Steel Round Bar
Material Standard	AISI / SAE Alloy & Carbon Steel
Product Type	Hot Forged Round Bar (Square / Flat on request)
Chemical Composition	1045: C 0.43–0.50%; Mn 0.60–0.90% 4140: C 0.38–0.43%; Cr 0.80–1.10%; Mo 0.15–0.25% 4340: C 0.38–0.43%; Ni 1.65–2.00%; Cr 0.70–0.90%; Mo 0.20–0.30%
Mechanical Properties	Yield Strength: 310–470 MPa (by grade) Tensile Strength: 585–930 MPa (by grade) Elongation: ≥ 16–20%
Available Sizes	Diameter: 20–600 mm; Length: 6 m / 12 m / Cut-to-length
Surface Condition	Black / Machined / Peeled / Polished
Heat Treatment	Annealed, Normalized, Quenched & Tempered
Applications	Shafts, gears, axles, hydraulic parts, oil & gas tools, heavy machinery
Advantages	High strength, dense structure, excellent toughness, good fatigue resistance
Quality Control	Mill Test Certificate (EN 10204 3.1); ISO 9001
Packing	Steel-strapped bundles or wooden cases, seaworthy export packing

AISI 4140 4340 1045 Round Steel Bar Size

Diameter (mm / in)	Length (m / ft)	Weight per Meter (kg/m)	Approx. Load Capacity (kg)	Notes
20 mm / 0.79 in	6 m / 20 ft	2.47 kg/m	1,200–1,500	AISI 1045 / 4140, light-duty shafts
25 mm / 0.98 in	6 m / 20 ft	3.85 kg/m	1,800–2,200	Good machinability, general mechanical parts
30 mm / 1.18 in	6 m / 20 ft	5.55 kg/m	2,500–3,000	AISI 4140 forged, transmission components
32 mm / 1.26 in	6–12 m / 20–40 ft	6.31 kg/m	3,000–3,600	Medium-load structural & machinery use
40 mm / 1.57 in	6 m / 20 ft	9.87 kg/m	4,500–5,500	AISI 4140 Q&T, axles & hydraulic rods
50 mm / 1.97 in	6–12 m / 20–40 ft	15.42 kg/m	6,500–8,000	AISI 4340 forged, high-stress components
60 mm / 2.36 in	6–12 m / 20–40 ft	22.20 kg/m	9,000–11,000	Heavy-duty shafts, oil & gas tools

AISI 4140 4340 1045 Round Steel Bar Customized Content

Category	Options	Notes
Dimensions	Diameter, Length	Ø20–Ø300 mm; 6 m / 12 m or cut-to-length
Processing	Cutting, Threading, Machining, Drilling	Customized processing per drawings or application
Heat Treatment	Annealed, Normalized, Q&T	Selected based on required strength and service conditions
Surface Finish	Black, Turned, Peeled, Polished	Chosen for accuracy and appearance needs
Tolerance	Standard / Precision	Straightness and tight tolerances available
Marking & Packing	Custom labels, Heat No., Export packing	AISI grade & heat number marked; steel-strapped bundles or wooden cases

Surface Finish

Carbon Steel Surface

Galvanized Surfce

Painted Surface

Application

1.Civil & Residential Construction: Ensuring the vital structural stability of skyscrapers and apartment buildings.

2.Infrastructure & Public Works: Vital to the bridge piers, girders, and reinforced concrete pavements that must resist enormous traffic load.

3.Industrial Engineering: Heavy flooring and machinery bases for factories and storage houses.

4.Manufacturing & Hardware: Superior quality round bars for the manufacture of bolts, nuts, shafts, and gears.

Our Advantages

Superior Bonding: Our deformed bars are designed with optimized rib patterns to provide maximum bond with concrete.

Good Weldability: The chemical composition of the quality makes it easier to weld at site without loosing strength.

Custom Lengths: Standard 6m, 9m and 12m lengths are available or tailored to your specific blueprints to reduce waste on site.

*Send the email to [email protected] to get a quotation for your projects

Packaging & Shipping

Standard Packing:Steel bars are tightly banded to keep them from moving and rusting. Wooden blocks or other bracing are added to stabilize the load for long distance haul.

Bespoke Packaging:Labels may refer to the steel grade, diameter, length, batch number, or project information. For sensitive surfaces palletizing and protective wrapping are offered.

Shipping Options:Shipments are reserved by container and flat rack or via local trucking according to the quantity and location. Full truckload (FTL) and less-than-truckload (LTL) services are also available.

Handling & Safety:Packaging is intended to allow safe handling, loading and unloading, for domestic and international transport.

Lead Time:The standard lead time is 7–15 days per order, expedited services available for large or repeat order.