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Detailed Description of Hot Rolled Steel Coil Products
Hot rolled steel coil is a core basic product in the steel processing field. Produced by high-temperature rolling technology, it has become an indispensable core raw material in many fields such as industrial production and infrastructure construction due to its excellent mechanical properties, wide specification adaptability and affordable cost. This product takes high-quality steel billets as raw materials and is processed through a series of precision processes such as heating, rolling and coiling. The finished product is in a continuous coil shape, which can be further processed into cut-to-length plates, steel strips, profiles, etc. according to downstream needs, adapting to diverse application scenarios.
I. Product Definition and Production Process
Hot rolled steel coil refers to a continuous strip steel formed by heating steel billets to an austenitic state of 1100-1250℃, continuously rolling through a hot rolling mill (rough rolling and finish rolling), and then coiling by a coiler. Its core production process has the characteristics of "high-temperature rolling and continuous forming". Compared with cold rolled steel coil, it does not require subsequent annealing treatment, has high production efficiency and lower cost, and at the same time retains the good toughness and plasticity of the steel itself.
Core production process: Steel billet inspection → Heating furnace heating → Rough rolling mill rolling → Finish rolling mill finishing → Controlled cooling treatment → Coiler coiling → Finished product inspection → Packaging and warehousing. Key parameters such as temperature and rolling speed are strictly controlled throughout the process to ensure stable product quality.
II. Core Product Characteristics
Excellent mechanical properties: After high-temperature rolling, the internal grains of the steel are refined, with good tensile strength, yield strength and toughness, not easy to brittle fracture, can bear large impact load and processing stress, and adapt to heavy-load and stress-bearing scenarios.
Good processing performance: It can be directly subjected to subsequent processing such as shearing, stamping, bending, welding and pipe coiling without complex pretreatment, with high processing efficiency and can meet the forming needs of different downstream products.
Diversified specifications: The thickness ranges from 1.5mm to 20mm, the width ranges from 1000mm to 1800mm, and the coil weight can be customized according to needs (conventional 2-30 tons), which can adapt to the specification requirements of construction, machinery, pipelines and other fields.
Outstanding cost performance: The production process is simple and efficient, and compared with cold rolled steel coil, the price is more advantageous. At the same time, the performance can meet the needs of most basic industrial needs, making it one of the steel products with the best cost performance.
Surface characteristics: The conventional product has a black surface (covered with scale), with moderate surface roughness. It can be subjected to surface treatments such as pickling and phosphating according to needs to improve corrosion resistance and subsequent processing adaptability.
III. Main Materials and Grades
The material of this product covers various types such as carbon steel and low alloy steel, and the mainstream grades are adapted to different application scenarios, as follows:
Carbon steel series: Q235 (Grade A/B/C/D), SS400, suitable for construction, steel structure, ordinary mechanical parts, etc., with high cost performance and the most extensive application.
Low alloy series: Q355 (Grade A/B/C/D/E), compared with carbon steel, it has higher strength and better toughness, suitable for machinery manufacturing, bridges, engineering machinery and other scenarios with higher strength requirements.
Special series: SPHC (for stamping), SAE1006/1008 (cold rolling raw material, stamping parts), ASTM A36 (for export, construction/machinery), adapted to specific processing needs and international standards.
IV. Specification Parameters (Conventional Range, Customizable)
Item |
Conventional Specification Range |
Description |
Thickness |
1.5mm - 20mm |
Thicker specifications can be customized according to needs (maximum up to 30mm) |
Width |
1000mm - 1800mm |
Conventional 1250mm and 1500mm, special widths can be customized |
Coil Weight |
2 tons - 30 tons |
Small coil weight is suitable for small processing equipment, and large coil weight is suitable for large-scale projects |
Length |
Calculated according to thickness, width and coil weight |
Continuous coil shape, can be cut-to-length according to needs |
Surface State |
Black Skin, Pickled |
Black skin is used for conventional scenarios, and pickled is used for processing with higher surface requirements |
V. Main Application Scenarios
Hot rolled steel coil is widely used in many fields such as construction, machinery, pipelines, automobiles and home appliances, and is the "basic raw material" of industrial production. The specific applications are as follows:
Construction field: Used for steel structure workshops, bridges, scaffolding, tower cranes, floor slabs, wall supports, etc. It uses its high strength and toughness to ensure the stability and safety of the building structure.
Machinery manufacturing field: Used for manufacturing machine tools, engineering machinery (excavators, cranes), agricultural machinery and equipment, mechanical parts, etc., which can be processed into various structural parts and connecting parts through subsequent processing.
Pipeline field: Used for producing welded steel pipes, spiral pipes, etc., adapting to pipeline projects such as water supply and drainage, gas transmission, and oil transmission, with good welding performance and pressure resistance.
Automotive field: Used for manufacturing automotive frames, chassis, wheels and other structural parts (needing subsequent pickling and stamping processing), balancing strength and plasticity.
Other fields: Used for home appliance casings, containers, hardware products, stamping parts, etc. At the same time, it can be used as raw material for cold rolled steel coils to be further processed into high-precision cold rolled products.
VI. Quality Standards and Inspection
This product is produced in strict accordance with national and industry standards. The core implementation standards include GB/T 709-2019 (Dimensions, Shape, Weight and Allowable Deviations of Hot Rolled Steel Plates and Strips) and GB/T 3274-2017 (Hot Rolled Thick Steel Plates and Strips of Carbon Structural Steel and Low Alloy Structural Steel). Export products can meet international standards such as ASTM, JIS and EN.
Finished product inspection items: Appearance inspection (no cracks, inclusions, folds, scratches and other defects), dimension inspection (thickness, width, coil diameter deviation meet the standard), mechanical performance inspection (tensile strength, yield strength, elongation), chemical composition inspection (C, Si, Mn and other element contents meet the standard), ensuring that each batch of products meets the quality requirements.
VII. Product Advantages
Stable quality: High-quality steel billets are used as raw materials, full automatic rolling is adopted, key processes are monitored in real time, product performance is uniform, and dimension deviation is small.
Wide adaptability: Specifications and materials can be customized to meet the personalized needs of different industries and scenarios without additional complex processing.
Controllable cost: High production efficiency, no additional annealing process, affordable price, which greatly reduces the procurement cost of downstream enterprises compared with cold rolled and alloy steel.
Timely supply: Conventional specifications are in sufficient stock, customized specifications can be arranged for production quickly, and the delivery cycle is short, ensuring the production progress of downstream.
Environmental compliance: The production process adopts environmental protection technology, reduces the emission of waste gas and waste water, meets national environmental protection standards, and can be purchased and used with confidence.
VIII. Packaging and Storage
Packaging: It is wrapped with double layers of waterproof wrapping paper and plastic film, and the outer layer is bound and fixed with steel strips to prevent moisture, scratches and rust during transportation. Each coil is marked with product specifications, grades, weight, production date and other information for easy identification and counting.
Storage: It should be stored in a dry, ventilated and flat warehouse, away from humid and acid-base environments, and avoid open-air stacking (if open-air stacking is needed, it should be covered with a rain shelter and moisture-proof mat). The stacking height should not be too high to prevent steel coil deformation and rust.
Note: This product can provide personalized processing services such as pickling, cut-to-length, shearing and bending according to customer needs. The delivery cycle for conventional in-stock products is 5-7 days, and the delivery cycle for customized specifications can be negotiated. For details, please consult customer service.
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