Carbon Hot Forged Steel A572 Round Bars Factory

Short Description:

Steel bars are essential construction and engineering materials widely used in reinforced concrete structures, industrial manufacturing, infrastructure projects, and steel fabrication. Manufactured from high-quality carbon steel, alloy steel, or stainless steel, steel bars offer excellent strength, durability, weldability, and load-bearing performance.

Model Number: AISI 4140, 4340, 1045, ASTM A36,A572,EN S235,S275,S355,GB Q235,Q355

Standard: AiSi, ASTM, GB, JIS,EN

Technique: Hot Rolled

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: MTC,ISO 9001,CE,SGS

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,GB	Grade	AISI 4140, 4340, 1045, ASTM A36,A572,EN S235,S275,S355,GB Q235,Q355,JIS SS400
Type	Carbon Steel Round 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	Non-Alloy	MOQ	20 Tons
Processing Service	Cutting, Punching	Certification	MTC,ISO 9001,CE,SGS
Delivery Time	within 7 days	Payment Term	T/T

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Round Steel Bar Size

Round steel rod properties table
diameter	Section	unit mass	diameter	Section	unit mass
mm	cm²	kg/m	mm	cm²	kg/m
6	0.283	0.222	45	15.9	12.5
7	0.385	0.302	46	16.6	13
8	0.503	0.395	48	18.1	14.2
9	0.636	0.499	50	19.6	15.4
10	0.785	0.617	52	21.2	16.7
11	0.95	0.746	55	23.8	18.7
12	1.13	0.888	56	24.6	19.3
13	1.33	1.04	60	28.3	22.2
14	1.54	1.21	64	32.2	25.3
16	2.01	1.58	65	33.2	26
18	2.55	2	68	36.3	28.5
19	2.84	2.23	70	38.5	30.2
20	3.14	2.47	75	44.2	34.7
22	3.8	2.98	80	50.3	39.5
24	4.52	3.55	85	56.8	44.6
25	4.91	3.85	90	63.6	49.9
27	5.73	4.5	95	70.9	55.6
28	6.16	4.83	100	78.5	61.7
30	7.07	5.55	110	95	74.6
32	8.04	6.31	120	113	88.7
33	8.55	6.71	130	133	104
36	10.2	7.99	140	154	121
38	11.3	8.9	150	177	139
39	11.9	9.38	160	201	158
42	13.9	10.9	180	255	200
			200	314	247

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Download the complete specification and dimension table for steel round bars.

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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

Round Steel Bar Production Line

Surface Finish

Carbon Steel Round Bar

Galvanized Round Bar

Painted Round Bar

Application

1. Construction and Infrastructure: Steel round bars are widely used in building foundations, reinforced concrete structures, bridges, highways, and public infrastructure projects. Their high strength and durability provide reliable structural support and long service life.

2. Machinery and Equipment Manufacturing: Round bars are commonly machined into shafts, pins, gears, fasteners, and mechanical components. Their excellent machinability and dimensional accuracy make them suitable for precision manufacturing applications.

3. Steel Structure Fabrication: Steel round bars are used in steel structure buildings, industrial plants, warehouses, and support systems. They serve as bracing members, tie rods, and connection components that enhance structural stability.

4. Energy, Mining, and Industrial Projects: In mining operations, power plants, and oil & gas facilities, steel round bars are used for equipment parts, support structures, drilling components, and heavy-duty industrial applications where strength and wear resistance are essential.

Why Choose Our Steel Round Bar

1.Wide Range of Sizes and Grades

Available in various diameters, lengths, and international standards including ASTM, EN, JIS, and GB to meet diverse project requirements.

2.Precision Manufacturing

Produced with advanced rolling and processing equipment to ensure accurate dimensions, smooth surface finish, and excellent machinability.

3.Strict Quality Control

Every batch undergoes rigorous inspection, including chemical composition analysis, mechanical property testing, and dimensional verification before shipment.

4.Reliable Global Supply

Large inventory, stable production capacity, and efficient logistics enable fast delivery for construction, industrial, and infrastructure projects worldwide.

5.Professional Export Service

China Royal Steel provides complete export support, including MTC certificates, third-party inspection reports, customized packaging, and professional technical assistance for international buyers.

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Packaging & Shipping

To ensure safe transportation and protection during international shipment, our steel round bars are carefully packed according to export standards.

Steel round bars are securely bundled with steel straps and protected with waterproof wrapping materials to prevent moisture, rust, and surface damage during transit. Both ends can be fitted with protective caps when required. Each bundle is clearly labeled with product specifications, heat numbers, and shipping marks for easy identification and traceability.

We offer flexible shipping solutions including 20GP/40GP containers, break bulk vessels, and flat rack containers depending on product dimensions and project requirements. Customized packaging is also available to meet specific customer or project standards.

With extensive export experience and a reliable logistics network, China Royal Steel ensures timely delivery and safe transportation of steel round bars to construction, manufacturing, infrastructure, and industrial projects worldwide.