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Help CenterSteel Coil & Strip & Hot Rolled Steel Coil,1000mm、1250mm、1500mm、1800mm
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I. Core Definition of the Product
Hot rolled steel coil (referred to as "HR coil"), also known as black coil, is a coiled steel product rolled at a high temperature (usually heated to 1100-1250℃). Compared with cold rolled steel coil, the production process of hot rolled steel coil is simpler, without subsequent annealing treatment, and the surface retains the iron oxide scale (black skin) formed during the rolling process, hence the name "black coil". It has a wide thickness range, which can be customized according to needs, and the coil weight is usually between 10-30 tons, which is convenient for storage, transportation and subsequent processing.
II. Characteristics of the Production Process
The production process of hot rolled steel coil mainly includes six links: raw material preparation, heating, rolling, coiling, inspection and packaging. Each link is strictly controlled to ensure stable product quality:
Raw Material Preparation: High-quality continuous casting billets (slabs) are adopted to ensure uniform composition, no inclusions and no cracks of the raw materials, laying a foundation for subsequent rolling;
Heating Treatment: The slab is sent into a heating furnace and uniformly heated to 1100-1250℃, so that the internal structure of the steel is softened, the plasticity is enhanced, and the rolling forming is facilitated;
Multi-pass Rolling: The slab is rolled into a thicker intermediate billet by a roughing mill, and then rolled multiple times by a finishing mill to accurately control the product thickness, width and surface flatness. On-line temperature control technology is adopted during the rolling process to ensure uniform steel performance;
Coiling Forming: After the rolled steel strip is cooled to an appropriate temperature by a cooling device, it is coiled into a tight steel coil by a coiler. The tension is controlled during the coiling process to avoid loosening and deformation of the steel coil;
Inspection and Testing: Comprehensive testing is carried out on the thickness, width, yield strength, tensile strength, surface quality and other indicators of the steel coil, and unqualified products are strictly prohibited from leaving the factory;
Packaging and Protection: Waterproof packaging paper, plastic film and steel strip are used for winding packaging to prevent the steel coil from being damp, rusted and damaged by collision during storage and transportation.
III. Core Characteristics of the Product
With its unique production process, hot rolled steel coil has the following core characteristics, which are suitable for various scenario needs:
Excellent Mechanical Properties: After high-temperature rolling, the internal structure of the steel is dense, with moderate yield strength and tensile strength, good toughness and strong impact resistance. It can bear a certain load and processing stress and is not easy to break;
Excellent Processing Performance: It has good plasticity and weldability, and can be subjected to various subsequent processing such as shearing, stamping, bending, welding and leveling (cut into steel plates), which is suitable for the forming needs of different products with low processing difficulty and high efficiency;
Complete and Diverse Specifications: The thickness can be customized to 1.5-20mm, the width can be customized to 1000-1800mm (conventional width 1250mm, 1500mm), and the coil weight is flexible, which can be adjusted according to customer needs to meet the differentiated needs of different industries;
High Cost-Effectiveness: The production process is simple and the energy consumption is low. Compared with cold rolled steel coil and stainless steel coil, it has more advantages in price. At the same time, its performance can meet the needs of most basic industrial needs, making it a high-cost-effective basic steel;
Wide Application Range: Although there is iron oxide scale on the surface, it does not affect the subsequent painting and derusting treatment. It can be subjected to pickling, phosphating, painting and other treatments according to the application scenario, and is suitable for various harsh environments.
IV. Main Materials and Grades
The materials of hot rolled steel coil are mainly carbon structural steel and low-alloy high-strength steel. Different grades correspond to different mechanical properties and are suitable for different application scenarios. The common grades and characteristics are as follows:
Q235 Series: The most commonly used grade of plain carbon hot rolled steel coil, with a yield strength of 235MPa and a tensile strength of 375-500MPa. It has good plasticity, strong weldability and low price, and is mainly used for building structures, supports, containers, agricultural machinery accessories, etc.;
Q355 Series: Low-alloy high-strength hot rolled steel coil, with a yield strength of 355MPa and a tensile strength of 470-630MPa. Its strength is higher than that of Q235, with excellent toughness and impact resistance, and it is used for mechanical manufacturing, bridges, construction machinery, automobile frames, etc.;
SPHC: Hot rolled steel coil for pickling, with pure material, good surface quality and excellent plasticity. It is mainly used for subsequent pickling and stamping processing, and is suitable for scenarios with high requirements on surface and formability such as home appliance casings and auto parts;
SS400: Japanese standard plain carbon hot rolled steel coil, with performance similar to Q235, good weldability and processability, and widely used in construction, machinery, steel structures and other fields;
ST37-2: German standard plain carbon hot rolled steel coil, with a yield strength of ≥235MPa and a tensile strength of 360-510MPa, suitable for general structural parts, containers, pipelines, etc.;
ASTM A36: American standard plain carbon hot rolled steel coil, with a yield strength of ≥250MPa and a tensile strength of 400-550MPa, which meets international standards and is mainly used for foreign trade export, large-scale steel structures, mechanical manufacturing, etc.
V. Common Specification Parameters
The specification parameters of hot rolled steel coil can be customized according to customer needs. The conventional specifications are as follows, and special specifications can be negotiated for production:
Thickness: 1.5mm, 2.0mm, 2.5mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm, 8.0mm, 10.0mm-20.0mm (customizable);
Width: 1000mm, 1250mm, 1500mm, 1800mm (conventional width), special width can be customized;
Coil Weight: 10 tons, 15 tons, 20 tons, 25 tons, 30 tons (can be adjusted according to transportation and processing needs);
Surface State: Black skin (iron oxide scale), pickled (iron oxide scale removed, smooth surface);
Executive Standard: GB/T 3274-2017 (National Standard), JIS G 3101 (Japanese Standard), DIN 17100 (German Standard), ASTM A36 (American Standard).
VI. Application Scenarios
Due to its excellent performance, diverse specifications and high cost-effectiveness, hot rolled steel coil is widely used in many industries and is a basic raw material for industrial production. The main application scenarios are as follows:
Construction Industry: Used for steel structure workshops, bridges, scaffolding, tower cranes, floor slabs, wall panels, anti-theft doors, etc. It is the core steel in building structures, which can bear building loads and ensure structural stability;
Mechanical Manufacturing Industry: Used for manufacturing machine tools, construction machinery (excavators, cranes), agricultural machinery and equipment, pressure vessels, gears, bearings, etc. It uses its excellent mechanical properties and processing performance to meet the forming and use needs of mechanical parts;
Pipeline and Container Industry: Used for manufacturing water and gas transmission pipelines, oil storage tanks, chemical containers, etc. It requires the steel to have good weldability and sealing performance, and the thickness and specifications can be customized according to needs;
Other Fields: Used for container manufacturing, ship accessories, hardware products, metal processing, etc. At the same time, it can be used as raw material for cold rolled steel coil and color-coated steel coil for subsequent deep processing.
VII. Storage and Transportation Notes
Storage: It should be stored in a dry, ventilated and rainproof warehouse, avoiding outdoor storage to prevent dampness and rust; The steel coil should be placed vertically, avoiding horizontal stacking to prevent deformation and flattening of the steel coil; Steel coils of different specifications and grades should be stored separately with clear marks for easy search;
Transportation: Flatbed trucks and containers are used for transportation. During transportation, they are firmly fixed with steel strips and steel wire ropes to prevent the steel coil from sliding and colliding; Avoid contact with sharp objects to prevent surface scratches; During rainy days, rainproof measures should be taken to avoid dampness of the steel coil.
VIII. Product Advantages
1. Reliable Quality: High-quality raw materials are adopted, and production is strictly in accordance with national standards. Each batch of products undergoes comprehensive testing to ensure stable performance and accurate specifications;
2. Flexible Specifications: Thickness, width, coil weight and material can be customized according to customer needs, adapting to the differentiated needs of different industries without secondary processing and adjustment by customers;
3. High Cost-Effectiveness: High production efficiency, low energy consumption, lower price than cold rolled steel, stainless steel and other steels. At the same time, its performance can meet the needs of most basic industrial needs, reducing customer procurement costs;
4. Convenient Processing: Good weldability and plasticity, can be subjected to various processing such as shearing, stamping and bending, adapting to the needs of mass production and personalized processing;
5. Stable Supply: It has a complete production system and inventory reserve, which can ensure the timely delivery of bulk orders and meet the production schedule needs of customers;
6. Efficient Delivery: The delivery cycle of conventional specification products is 5-7 days, and the delivery cycle of customized specifications can be determined through negotiation according to the production progress to ensure on-time delivery.
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