Hot Rolled Steel Strip

Hot Rolled Steel Strip is one of the most basic and widely used semi-finished materials in the steel industry. It has excellent mechanical properties, high production efficiency and cost advantages. It is the raw material for industries such as construction, automobiles, machinery manufacturing, and energy. Wanzhi Steel specializes in the production and processing of Hot Rolled Steel Strip of various thicknesses. The width can be customized, and there are many steel grade options. Welcome to send us your requirements.

Hot Rolled Strips

ST372 Carbon Structural hot rolled Steel strip

Hot Rolled Steel Strip Specification

What is  hot-rolled steel strip?

Hot rolled steel strip refers to a strip of steel that is continuously rolled through a hot rolling mill after the steel billet is heated to the recrystallization temperature (usually 1100°C~1300°C). Its surface has iron oxide scale. Compared with cold rolled steel strip, hot rolled steel strip is rolled at high temperature, has higher toughness and good machinability, and is suitable for various structural parts and industrial uses.

Surface close-up

Hot rolled strip stock

 Features

• High strength and ductility: elongation 20%~30%, yield strength of Q235B and Q355B reaches 235MPa~550MPa. It can withstand large mechanical stress while maintaining stable shape.
• Easy to process and form: easy to bend, cut, stamp and weld, suitable for subsequent processing. Steels of various shapes can be manufactured.
• Economical: Because the production method is direct hot rolling forming, the annealing and finishing processes of cold rolling are omitted, the cost is reduced by 15%~30%, which has price advantages.
• Appearance: There is a natural oxide layer on the surface, which can be removed by pickling or shot blasting, suitable for further surface treatment such as galvanizing and coating to improve corrosion resistance.
• Many specifications: thickness tolerance ±15mm~±0.3mm, better than medium and thick plates. The thickness, width and length of the steel strip can be customized.

Hot rolled ST 37 Steel Roll

Hot rolled coil slitting

Uses

Recommended uses of different steel grades

• Q235B, Q355B: Construction engineering, such as H-shaped steel, floor decking, and bridge structures.
• SS400, A572Gr50: Machinery manufacturing, such as hydraulic supports and engineering mechanical arms.
• Q345B, S355JR: Energy and power, such as wind power towers and transmission towers.
• SPHC, DC01: Hardware processing, such as welded pipes and cold-formed steel.

bridge structure

Roof shape structure

Cross-industry applications

• Profile production: directly rolled into angle steel, channel steel, I-beam and other profiles for structural support of buildings and bridges.
• Strip steel stripping: cut into narrow strip steel according to demand, used to make clockwork, saw blades, strapping tape, etc.
• Metallurgy and metal processing: as the raw material of cold-rolled steel plate, the thinner and flatter plate obtained after cold rolling is used for anti-corrosion parts of buildings and home appliances.
• Construction: frames, beams and supports of industrial plants, bridges and high-rise buildings. It is also used as reinforcement for floor slabs and walls, and as door and window frame materials.
• Automobile manufacturing: door inner panels, roof frames, chassis longitudinal beams, wheel hubs, exhaust pipes and mufflers, suspension systems such as shock absorber housings and spring brackets. Take advantage of its high temperature resistance.
• Industry: the base and support of machine tools and heavy equipment can be processed into gears, transmission shafts, etc., and made into bolt and nut blanks by cold or hot upsetting processes.
• Energy and pipeline engineering: welded into welded pipes for laying onshore and offshore oil and gas pipelines, manufacturing flanges, elbows, tees and other pipeline connectors.
• Power equipment: support and protection structure of power cables in substations, hot-rolled silicon steel sheets with low silicon content are used to manufacture low-frequency transformer cores.

PVDF-Building

Mechanical bearings

Community slide

Common types of hot-rolled steel strips

1. Classification by material

• Low carbon steel (such as Q235B): general type, good weldability, used for building structures.
• High strength steel (such as Q355B): mechanical parts with high load-bearing requirements.
• Weathering steel (such as 09CuPCrNi-A): used for open-air facilities, resistant to atmospheric corrosion.

2. Classification by surface treatment

• Black skin coil (unpickled): directly used for structural parts with no appearance requirements.
• Pickled coil: removes oxide scale, smoother surface, suitable for precision processing.
• Oiled coil: rust-proof treatment, short-term storage and transportation protection.

A36 Grade50 S235jr 1.2mm CR Coil

Hot Rolled Strip Slite Steel Coil Sheet

Production process

• Steelmaking and continuous casting: The molten iron is smelted in a converter/electric furnace and continuously cast into 200~250mm thick slabs.
• Heating furnace: The slab is heated to 1250°C±50°C to ensure rolling plasticity.
• Rough rolling and finishing rolling: Rough rolling (thickness → 30~50mm) → finishing rolling (final thickness 1.0~4.0mm).
• Laminar cooling and coiling: Control the cooling rate to adjust the mechanical properties and coil into steel coils (inner diameter Ø508-760mm).
• Finishing treatment: Optional post-processes such as pickling, straightening, and striping.

Hot rolled strip process diagram

Hot Rolled Steel Strip Manufacturer- Wanzhi Steel 

• Capacity and equipment: Annual capacity of 3 million tons of hot-rolled steel strip, equipped with 2 2250mm hot rolling mills.SMS Group rolling mill (thickness accuracy ±0.05mm), Danieli automatic control system.
• Quality control: Online ultrasonic flaw detection (detection of internal defects), mechanical properties test (tensile, impact test), certification system: ISO 9001, CE, ABS, BV.
• Service advantages: Flexible supply, sufficient inventory of conventional specifications, support for customized chemical composition (such as sulfur and phosphorus content ≤0.025%).
• Fast delivery: Export packaging (steel coil + anti-rust paper + steel strip bundling), direct delivery to ports around the world.

Hot rolled strip shipped to Russia

Hot rolled strip shipped to Brazil

Conclusion

Hot-rolled steel strip continues to occupy the core position of basic industrial materials with its high cost-effectiveness and process adaptability. Wanzhi Steel provides customers with a full range of hot rolling solutions from ordinary carbon steel to high-strength steel with advanced rolling technology, strict quality management system and flexible supply chain.

For specific technical parameters or samples, please contact our sales team!