Carbon Steel Flat Bar

Carbon Steel Flat Bar is a solid rectangular steel product widely used in construction, manufacturing, and general fabrication applications. It features excellent strength, good weldability, and consistent dimensional accuracy for versatile processing. Common materials include A36, Q235, SS400, 1018, and C45 carbon steel grades. This flat bar functions as structural supports, machinery components, brackets, frames, and reinforcement parts in building and industrial projects.

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PRODUCT DETAILS

Carbon Steel Flat Bar is a solid rectangular steel product widely used in construction, manufacturing, and fabrication industries for its versatility and strength. This Carbon Steel Flat Bar comes in various grades and dimensions to meet diverse structural and mechanical requirements .

Product Parameters

Width range: 10mm to 400mm .

Regular sizes include 12mm, 20mm, 25mm, 30mm, 40mm, 50mm, 60mm, 80mm, 100mm, 120mm, 150mm, 200mm, 250mm, and 300mm . Thickness range: 2mm to 60mm . Common thicknesses: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 15mm, 20mm, 25mm, 30mm, 40mm, and 50mm .

Length: 6 meters standard, with custom lengths from 1m to 12m available .

Processing techniques: Hot rolling, cold rolling, and cold drawing .

Common grades: A36, Q235, Q345, SS400, S235JR, S275JR, S355JR, 1018, 1045, C45, and St37-2 .

Execution standards: ASTM A36, ASTM A108, ASTM A29, EN 10025, JIS G3101, and GB/T 700 .

Packaging: Seaworthy bundles with steel strips, waterproof wrapping, or wooden crates for export protection .

Surface treatment: Black bare, bright finish, polished, pickled and oiled, galvanized, or painted as requested .

Chemical Composition

Grade	C (%)	Mn (%)	Si (%)	P (%)	S (%)	Others
A36	≤0.29	0.75-1.20	0.15-0.40	≤0.040	≤0.050	Cu ≥0.20
Q235	0.12-0.20	0.30-0.70	≤0.30	≤0.045	≤0.045	–
SS400	0.17-0.22	0.80-1.40	0.15-0.35	≤0.050	≤0.050	–
1018	0.15-0.20	0.60-0.90	0.15-0.30	≤0.040	≤0.050	–
C45	0.42-0.50	0.50-0.80	0.15-0.40	≤0.035	≤0.035	Cr ≤0.20

Physical Properties

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HB)
A36	400-550	250	20-23	140
Q235	375-500	235	26	–
SS400	400-510	245	21	–
1018	550	370	15	126-143
C45	570-700	450	14-17	170-210

Product Applications

Building construction and structural frameworks including columns, beams, and brackets . Machinery manufacturing for equipment frames, guides, and support components . Automotive industry for chassis parts and reinforcement components . Shipbuilding for hull reinforcements and deck supports . Infrastructure projects including bridges and transmission towers . General fabrication for gates, railings, furniture, and ornamental items . This Carbon Steel Flat Bar provides reliable performance across these applications with consistent quality and mechanical properties.

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FAQ

1. How to get samples to check the quality? How long can I get the samples?
Answer:After confirming the price, we are happy to provide samples for your evaluation. After confirming the sample details, the samples will be ready for delivery within 3-7 days, and sent to you by courier, and arrive within 3-5 days.
2.Do you provide samples ? is it free or extra ?
Answer:We provide samples free of charge, but the customer is responsible for the courier freight.
3. Do you accept the third party inspection?
Answer: Yes absolutely we accept.
4.Can you accept customization?
Answer:Yes. If you have special requirements on products or packages, we can do customization for you.
5.How do you control the quality?
Answer:We have professional inspectors to analyze chemical composition of raw materials and test the finished products strictly according to standard stipulated in the contract. In this process, Internal and external surfaces, two ends appearance, bending degree, fixed length, outer diameter and wall thickness dimension etc will be checked one by one. You can be assured that all the products you get from us are reliable.