Hot Rolled SAE 1018 1045 4140 4130 Alloy Steel Round Bar

Short Description:

Steel Round Bar is a solid cylindrical steel product widely used in construction, manufacturing, machinery, automotive, energy, and engineering industries. It is produced through hot rolling, cold drawing, forging, or machining processes, offering excellent strength, durability, machinability, and weldability depending on the material grade.

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

Standard	ASTM,JIS,EN,AISI	Grade	A36, SS400, S235JR,SAE1010, 1020,etc
Type	Carbon Steel Bar	Steel Grade	Carbon Steel
Application	Structural Steel Bar	Place of Origin	Tianjin, China
Tolerance	±1%	Brand Name	Royal
Technique	Hot Rolled	Length	6m-12m
Alloy Or Not	Alloy	MOQ	1Tons
Processing Service	Cutting, Punching	Certification	MTC
Delivery Time	within 7 days	Payment Term	T/T

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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 Round Bar

Galvanized Round Bar

Painted Round Bar

Application

1.Construction & Structural Use: Used in building frames, supports, and infrastructure projects.Provides high bearing capacity for bridges, warehouses and steel beams.

2.Machinery & Engineering Parts: Use for shafts, pins, axles, gears, and mechanical parts.Offers good machinability and strength for producing high precision instruments.

3.Automotive & Transportation: It is used in the automotive parts including Drivetrain parts, Suspension parts and Engine parts.Provides a proven combination of durability, toughness, and consistent, dependable performance in severe service.

4.Industrial Fabrication & Manufacturing: Applicable to the products of bolt, fastener,threaded rod,engineering material and so on Easy to process (cutting, welding, machining) for widely industry use.

Why Choose Our Steel Round Bar

1. Full Range of Steel Round Bars

We are carbon steel round bar supplier, offering various grades of carbon steel, alloy steel, and stainless steel round bars, such as Q235, Q355, 4140, 4130, 304, and 316, to meet diverse industry needs.

2. Strict Quality Control

All products are manufactured and inspected according to international standards such as ASTM, EN, JIS, and GB to ensure consistent mechanical properties and reliability.

3. Custom Sizes and Machining

We can provide customized diameter, length, heat treatment, cutting, and surface treatment services based on specific project and engineering requirements.

4. Global Export Experience

We have extensive export experience in Southeast Asia, the Middle East, Europe, and the Americas, ensuring smooth logistics and documentation processes.

5. One-Stop Steel Supply Solutions

We also supply H-beams, C-channels, steel pipes, sheet piles, and other structural steel products to meet diverse project needs.