Wholesale GB Standard Q195, Q215, Q235, Q275, Q345 Carbon Structural Steel Bars – High-Strength, Easy-to-Process Steel for Construction and Machinery Manufacturer and Supplier

GB Standard Q195, Q215, Q235, Q275, Q345 Carbon Structural Steel Bars – High-Strength, Easy-to-Process Steel for Construction and Machinery

Short Description:

The national quality standard carbon steel bar, the specification covers q195, q215, q235, q275, q345 series, with moderate strength, easy processing, is commonly used to make mechanical parts, building structures and other engineering applications.

Standard: GB

Material: Q195, Q215, Q235, Q275, Q345

Length: 2M,4M,5.8M,6M,11.8M,12M or as required.

Surface: Black,painted,galvanized...

Samples: Free samples are provided but the fright is borne by the buyer.

Payment Terms: 30% deposit by T/T, the balance against copy of B/L by T/T.

Delivery Time: 7-15 Days

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Product Detail

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Product Introduction

Comparison of Chemical Composition of National Standard Carbon Structural Steel Bars (%)

Material	C	Si	Mn	P	S	Description
Q195	0.12-0.20	≤0.30	0.30-0.60	≤0.045	≤0.045	Low carbon steel: low strength, easy to process
Q215	0.12-0.20	≤0.30	0.30-0.60	≤0.045	≤0.045	General purpose carbon steel: moderate strength
Q235	0.14-0.22	≤0.30	0.30-0.70	≤0.045	≤0.045	Most commonly used structural steel: good weldability
Q275	0.16-0.22	≤0.30	0.30-0.80	≤0.045	≤0.045	Medium carbon steel: relatively high strength, suitable for load-bearing components
Q345	0.18-0.20	≤0.50	1.00-1.50	≤0.035	≤0.035	Low alloy high-strength steel: suitable for large structures and bridges

Notes:

1.The lower content of P and S improved the fluidity and toughness of the steel.

2.Q345 is a kind of low-alloy high strength steel, they all have much higher strength than Q235 and Q275.

3.Increasing the carbon content in the steel increases the hardness but also the machinability.

Comparison Table of Mechanical Properties of National Standard Carbon Structural Steel Bars

Material	Yield Strength σ<sub>y</sub>（MPa）	Tensile Strength σ<sub>b</sub>（MPa）	Elongation δ5 (%)	Typical Application
Q195	195	315-430	≥26	Low-strength structural components and mechanical parts
Q215	215	345-480	≥25	General mechanical structural components and light building structures
Q235	235	375-500	≥23	Building structures, bridges, and mechanical parts
Q275	275	410-540	≥21	Medium-load-bearing structures and engineering machinery parts
Q345	345	470-630	≥20	Bridges, ships, heavy structures, and high-strength load-bearing components

Complete Specifications of National Standard Carbon Structural Round Steel (Q195–Q345)

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	2.56 kg/m	750–950
25 mm / 0.98 in	6 m / 20 ft	3.99 kg/m	1,050–1,350	Good weldability, structural use
30 mm / 1.18 in	6 m / 20 ft	5.76 kg/m	1,600–2,000	General structural and fabrication
32 mm / 1.26 in	12 m / 40 ft	6.16 kg/m	2,000–2,400	Medium-duty construction
40 mm / 1.57 in	6 m / 20 ft	9.95 kg/m	2,700–3,200	Industrial machinery and beams
50 mm / 1.97 in	6–12 m / 20–40 ft	15.52 kg/m	4,000–4,700	Load-bearing components
60 mm / 2.36 in	6–12 m / 20–40 ft	22.34 kg/m	5,500–6,200

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Surface Finish

Ordinary Surface

Galvanized Surface

Black Oil Surface

Round Steel Bar Customized Content

Customization Category	Options	Description / Notes
Dimensions	Diameter, Length	Diameter: Ø10–Ø100 mm (may be customized); Length: 6 m / 12 m or cut-to-length as per project requirements
Processing	Cutting, Threading, Bending, Machining	Bars can be cut, threaded, bent, drilled and machined as per drawing or requirements of application.
Surface Treatment	Black, Pickled & Oiled, Galvanized, Painted	Choose for indoor/outdoor application and resistance to corrosion.
Straightness & Tolerance	Standard / Precision	Straightness and dimensional tolerances can be controlled on request
Marking & Packaging	Custom Labels, Heat No., Export Packing	Labels: size, grade (ASTM A572 Grade 50), heat number; packaged in steel strapped bundles ideal for container shipping or local delivery

Notes Added to Proof:
Small Round Steel (6–25mm): used for mechanical parts, bolts, and shaft parts;
Medium Round Steel (25–200mm): popular application within building structure, bridges and engineering machinery parts;
Q345 is a low alloy high strength steel which possesses a much higher load bearing capacity than Q235 and Q275, is applicable for the high strength application;
Data in the tables are according to the standards of GB/T 699-1999 (Carbon Structural Steel) and GB/T 700-2006 (Low-alloy High-strength Steel).

Round Steel Bar Application

Structural Supports
Beams, columns, baseplates, brackets, and other load bearing elements needing strength and durability.
Steel Structures & Buildings
Light to heavy steel structures for factories, bridges, workshops, warehouses and associated construction elements.
Machinery & Equipment Parts
Frames, mounts, shafts and mechanical parts that require strength and durability.
Fabricated Steel Products
Welded weldments & plates for structural, industrial and general fabrication purposes.

GB-Standard-Round-Bar-Application-Royalsteelgroup

Packing And Delivery

1. Packaging Methods
Bundling and Tying Up Steel bars are tied up into bundles as per size and length specifications using steel or plastic straps, for easy carrying, loading and unloading.
Wooden Pallet Support: Medium to large diameter steel bars are supported by wooden pallets to prevent the bar from potential uneven stress or bending.
Moisture and rust proof: The surface layer is sprayed with anti-rust oil or sealed with an anti-moisture film. Desiccants are inserted into the bundles to protect against moisture and rust during transportation.
Customization: Length cutting, sleeve protection, or special packaging on the customers׳ request.
2. Transportation Methods
Road Transport: Good for transporting in short distance or delivery to construction site.
The steel bars are tightly bundled to avoid immediately rolling and crashing so that they can arrive at destinations safety.
Rail Transportation: Applicable for steel delivery in long distance for a large volume.
Full truckload transportation, support frames, steel straps for safely mounting full truckload transportation, support frames full truckload strapping for safely mounting full truckload transportation, support frames full truckload strapping.
Ocean Transportation: Proper for the steel export / long distance bulk delivery.
Containers, bulk cargo or open-top containers - we can be flexible with the arrangements according to the nature of your cargo and your port of destination.
3. Advantages
The steel bars are steamed, water cleaned, dried, oil applied and wrapped up with several layers of newsprint before tapes wrapped around hold everything together.
Diverse transportation packages pool efficiency and safety for domestic and global logistics.

Stable cooperation with shipping companies such as MSK, MSC, COSCO efficiently logistics service chain, logistics service chain are we to your satisfaction.

We follow the standards of quality management system ISO9001 in all procedure, and have strict control from packaging material purchase to transport vehicle scheduling. This guarantees the H-beams from the factory all the way to the project site, helping you build on a solid foundation for a trouble free project!

Tianjin Royal Group Pioneering Excellence in Hot Rolled Steel Bars

FAQ

1. How to get a quote for steel bars?

You can contact us via online message, email, or phone. We will provide you with a quote and delivery information as soon as possible.

2. Can you provide samples?

Of course. Samples are usually free (small sizes or small quantities). We can also produce according to customer samples or drawings.

3. What are the standards and materials for steel bars?

Chinese Standard (GB): Q195, Q215, Q235, Q275, Q345
European Standard (EN): C15, C22, C45, 42CrMo4
American Standard (ASTM/AISI): 1018, 1045, 4140
Appropriate materials can be selected according to project requirements.

4. What is the delivery time for steel bars?

In-stock supply: Usually 3-7 days for delivery
Custom production: Usually 15-30 days for delivery, depending on material, diameter, and length

5. What are the payment methods?

Common payment methods: T/T (telegraphic transfer), PayPal is available in some areas. 6. Can steel bars be cut or customized to length?

Yes. We offer cutting and customization services to your requirements, and can also provide surface treatments such as pickling, painting, and rust-preventive oiling.

7. What are the transportation methods for steel bars?

Road transport: Short-distance or on-site delivery
Rail transport: Medium- to long-distance bulk transport
Sea transport: Export or long-distance bulk cargo
Sturdy packaging, moisture-proof and rust-proof, ensuring safe delivery.

8. How is the quality of the steel bars guaranteed?

Manufactured strictly according to national standards (GB), European standards (EN), and American standards (ASTM)
Material certificate (Mill Test Certificate, MTC) provided
Dimensional, mechanical property, and surface inspections conducted before leaving the factory.