A36 Carbon Steel Flat Bar – Reliable Choice for Construction & Machinery
Product Introduction
Flat steel is a type of steel product with a rectangular or flat cross-section, typically produced through hot rolling or cold rolling. Its width (10mm~300mm) is significantly greater than its thickness (3mm~60mm). Known for high strength and machinability, flat steel is widely used in construction, machinery manufacturing, automotive components, shipbuilding, and other industrial applications.
The Production Process Key Steps
Feeding: Feeding the raw material (steel plate) into the slitting line for preliminary processing1.
Slitting: Cutting the steel plate into flat bars of the required width through the longitudinal cutting equipment to ensure width accuracy.
Leveling and cutting: Leveling the slitting flat bar to eliminate bending or deformation, and then cutting it to the customer's specified length (usually 2-12 meters).
Standards and Grades
GB/T 702-2017, GB/T 700-2006: Q235, Q355, 20#, 45#, 60Si2Mn;
EN 10067:1996, EN 10025-2, DIN 17100: S235JR/S355JR, ST37, ST52;
JIS G 3101, JIS G 3106: SS400, SM490, SAPH440;
ASTM A36, ASTM A572: A36, Gr50, Gr60;
Main Size Specifications
The size range of Steel Flat Bar varies depending on the standard and manufacturer, and the common parameters are as follows:
Thickness: 3-40 mm (hot rolled).
Width: 10-200 mm (some suppliers can customize to 300 mm).
Length: The standard length is 6-12 meters, and customization is supported (such as 2-meter short materials).
Tolerance: The width and thickness tolerances are usually ±5%.
Application
Construction & Steel Structures： Flat steel is widely used in building frames, bridge supports, and steel structure connections, offering reliable load-bearing capacity and bending resistance.
Machinery Manufacturing：As base plates, guide rails, and gear blanks in machinery, flat steel is a critical material due to its high strength and machinability.
Automotive Industry：Used in chassis, suspension parts, and bumper reinforcements, flat steel withstands high impact and vibration in vehicles.
Shipbuilding & Offshore Engineering：Corrosion-resistant flat steel (e.g., AH36 marine grade) is ideal for hulls, deck supports, and offshore platforms.
Hardware Tools & Molds：It can be processed into cutting tools, mold inserts, and clamps, meeting precision and wear-resistant requirements.
Power & Energy：For transmission towers, transformer frames, and solar mounts, flat steel ensures structural stability and conductivity.
Home & Decoration：Applied in stair railings, furniture frames, and decorative trims, it combines aesthetics with durability.
Surface Treatment, Packaging and Transportation
Surface treatment: including bare material (Bare), galvanized (Galvanized), painted (Painted), etc. Galvanizing can significantly improve corrosion resistance.
Packing method: usually bundled into rolls or loaded into containers (20/40 feet), suitable for sea or land transportation needs.
fAQ
1. What materials are used for flat steel? Which is most common?
Common materials include Q235 (low-carbon steel), 45# steel, stainless steel (e.g., 304/316), etc. Q235 is the most widely used in construction and machinery due to its cost-effectiveness.
2.What size range do you offer? Can you customize?
Standard sizes: Thickness 3mm–20mm, width 10mm–200mm, length 1m–12m. Custom sizes/tolerances are available.
3. What surface treatments are available?
Options include mill scale (hot-rolled), sandblasting, galvanizing, and polishing. Galvanizing improves rust resistance.
5. Can flat steel be used outdoors? How to prevent rust?
Yes! Galvanized flat steel or regular anti-rust paint is recommended. Stainless steel is ideal for humid environments.