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Help CenterSteel Sheet & Plate & Checkered Plate，Q235B Q355B
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I. Material, Grade and Implementation Standard
This product is produced with high-quality carbon structural steel and low-alloy high-strength structural steel, strictly complying with the national standard GB/T 3277-2015 (National Standard for Checkered Steel Plates) to ensure stable product quality and qualified performance, adapt to the use requirements of various industrial and civil scenarios, and prevent unqualified products from entering the market.
Common Materials: Carbon structural steel (low-carbon steel) and low-alloy high-strength structural steel. The material is pure with low impurity content, stable mechanical properties, easy welding and processing. Products of corresponding materials can be selected according to the load-bearing and weather resistance requirements of the use scenario.
Main Grades and Application Scenarios:
Q235B: The most commonly used carbon structural steel grade, with excellent comprehensive performance, moderate strength, good toughness, excellent welding performance and high cost performance. It is suitable for general load-bearing scenarios, such as ordinary industrial platforms, stair treads, light truck floors, scaffolding planks, etc.
Q355B: Low-alloy high-strength structural steel. Compared with Q235B, it has higher strength, stronger load-bearing capacity, and slightly better impact resistance and corrosion resistance. It is suitable for heavy-load, outdoor, humid and other scenarios with high requirements for strength and weather resistance, such as heavy industrial platforms, large truck floors, ship decks, outdoor steel structure walkways, etc.
Explanation of Implementation Standard: GB/T 3277-2015 specifies the size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of checkered steel plates, ensuring that the dimensional accuracy, pattern integrity and mechanical properties of the products meet industry standards and guarantee the safety of use.
II. Chemical Composition (Smelting Analysis, Mass Fraction %)
Chemical composition is the core factor determining the mechanical properties, welding performance and corrosion resistance of checkered plates. This product strictly controls the content of each element to ensure that the material meets the standards. The following are the detailed chemical composition requirements of the two commonly used grades Q235B and Q355B, which are in line with the relevant provisions of GB/T 3277-2015, GB/T 700-2006 (National Standard for Carbon Structural Steel) and GB/T 1591-2018 (National Standard for Low-Alloy High-Strength Structural Steel).
Grade |
Carbon (C) ≤ |
Silicon (Si) ≤ |
Manganese (Mn) ≤ |
Phosphorus (P) ≤ |
Sulfur (S) ≤ |
Remarks |
Q235B |
0.12 |
0.30 |
0.30 |
0.045 |
0.045 |
Low carbon content, excellent welding performance, good toughness, suitable for conventional scenarios |
Q355B |
0.16 |
0.50 |
1.60 |
0.040 |
0.040 |
Appropriate increase of manganese element to improve strength and impact resistance; low phosphorus and sulfur to reduce material defects |
III. Pattern Types and Characteristics
The patterns of this product are all formed by hot-rolled integral forming process, with clear patterns, uniform protrusions and strong adhesion, which are not easy to fall off and wear. Different pattern types are suitable for different use scenarios, and customers can choose according to anti-slip needs, walking comfort and aesthetics.
Diamond Pattern (Most Commonly Used): The patterns are distributed in a diamond shape, with moderate protrusion height (0.5-2mm, not included in the base plate thickness). It has the best anti-slip performance, uniform force bearing, not easy to accumulate dirt and easy to clean. It is suitable for most scenarios, especially areas with frequent personnel movement, goods stacking or wet and slippery conditions, such as industrial platforms, workshop walkways, stair treads, truck floors, etc. It is the most widely used pattern type.
Lentil Pattern: The patterns are lentil-shaped, with rounded protrusions and smooth transitions, high walking comfort and balanced anti-slip performance. Compared with the diamond pattern, the surface is flatter, which is not easy to hook clothes or goods. It is suitable for scenarios where personnel walk for a long time and goods are handled frequently, such as shopping mall stairs, workshop passages, light equipment pedals, etc.
Round Bean Pattern: The patterns are round granular, with small and uniform protrusions, flat and smooth surface, easy to clean and not easy to accumulate dust. It has moderate anti-slip performance and strong decorativeness. It is suitable for scenarios with certain requirements for aesthetics and general anti-slip needs, such as indoor decoration, light walkways, equipment shell decoration, etc.
Willow Leaf Pattern (Optional): The patterns are willow leaf-shaped, with smooth lines, strong decorativeness and general anti-slip performance. It is mainly used for decorative scenarios, such as building exterior wall shapes, exhibition hall floors, indoor partitions, etc., taking into account both aesthetics and slight anti-slip needs.
IV. Specification, Size and Customization Instructions
The product has a complete range of specifications, covering conventional sizes, and also supports customized production according to needs to meet the installation and use needs of different scenarios. All sizes strictly comply with GB/T 3277-2015 standard, with high dimensional accuracy and deviation controlled within the allowable range to ensure installation adaptability.
Base Plate Thickness: Conventional thickness: 2.5mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm, 8.0mm, 10.0mm, 12.0mm; Special thickness can be customized (1.5mm-15mm). The thickness selection should be combined with the load-bearing requirements. For light-load scenarios, 2.5-5.0mm can be selected; for heavy-load scenarios, 6.0-12.0mm can be selected; for ultra-heavy-load scenarios, plates thicker than 12mm can be customized.
Common Width: 1000mm, 1250mm, 1500mm. These three widths are conventional industry sizes, suitable for most cutting and installation scenarios, no additional cutting is needed, and construction efficiency is improved; special width can be customized (800mm-2000mm), and the production cycle needs to be confirmed in advance.
Common Length: 6000mm (conventional fixed length), and also supports customized length according to needs, with a length range of 1000mm-12000mm. It can be customized according to the size of the construction site to reduce cutting waste and construction cost; when the fixed length exceeds 6000mm, the transportation feasibility needs to be confirmed.
Pattern Height: The conventional pattern height is 0.5-2.0mm, not included in the base plate thickness. The pattern height can be adjusted according to anti-slip needs. The higher the anti-slip requirement, the appropriately higher the pattern height can be (maximum not more than 3.0mm).
Theoretical Weight Reference (convenient for customers to calculate usage):
Diamond Pattern: 3.0mm (base plate) ≈24.5kg/㎡; 5.0mm (base plate) ≈42.3kg/㎡; 6.0mm (base plate) ≈50.1kg/㎡; 8.0mm (base plate) ≈65.8kg/㎡.
Lentil Pattern: 3.0mm (base plate) ≈23.8kg/㎡; 5.0mm (base plate) ≈40.5kg/㎡; 6.0mm (base plate) ≈48.4kg/㎡; 8.0mm (base plate) ≈63.6kg/㎡.
V. Core Product Performance
Relying on high-quality carbon steel material and advanced hot rolling process, this product has excellent comprehensive performance, adapts to various complex scenarios, and is stable and reliable for long-term use. The specific performance is as follows:
Anti-slip Performance: The surface patterns effectively increase the contact surface friction. The wet friction coefficient can reach 0.3-0.9, and the dry friction coefficient is higher, which can effectively prevent people from slipping and goods from sliding, especially suitable for wet, oily, water-accumulated scenarios, such as workshops, ship decks, truck floors, etc.
Mechanical Performance: High strength and good toughness. The tensile strength of Q235B is ≥375MPa, and the yield strength is ≥235MPa; the tensile strength of Q355B is ≥470MPa, and the yield strength is ≥355MPa. It has strong load-bearing capacity. The 6mm thick carbon steel checkered plate can bear more than 800kg per square meter, which can meet the use needs of conventional and heavy-load scenarios, and is not easy to deform or break.
Processing Performance: Excellent welding performance, can adopt various welding methods such as arc welding and gas shielded welding. The weld seam is firm after welding, without cracks, pores and other defects; easy to cut, bend and punch, can be processed into various shapes according to actual needs, adapt to different installation scenarios, and high processing efficiency.
Wear and Impact Resistance: The surface patterns are strengthened by hot rolling, with higher hardness than the base plate, excellent wear resistance and not easy to wear; the material has good toughness and strong impact resistance, can bear a certain impact and vibration, and is suitable for scenarios prone to wear and impact such as industrial workshops and truck transportation.
Anti-corrosion Treatability: Carbon steel itself is prone to rust, and can be anti-corrosion treated by galvanizing (hot-dip galvanizing, cold galvanizing), painting, plastic spraying, etc., to improve corrosion resistance and extend service life. After treatment, it can be adapted to outdoor, humid, weak corrosive scenarios, such as outdoor platforms, ship decks, etc.; untreated products are recommended for dry, indoor scenarios.
VI. Production Process
This product adopts advanced hot rolling production process, with full automatic control, ensuring stable product quality, uniform patterns and accurate dimensions. The production process strictly follows industry standards, and the specific process is as follows:
Raw Material Selection: High-quality Q235B and Q355B steel billets are selected, and the chemical composition and mechanical properties of the steel billets are strictly inspected to eliminate steel billets with excessive impurities and unqualified performance, ensuring product quality from the source.
Heating and Rolling: The steel billet is sent to the heating furnace and heated to 1000-1200℃ to make it reach a plastic state, then rolled by the hot rolling mill, and the pattern is integrally embossed on the steel plate surface through the roller with patterns, ensuring clear patterns, uniform protrusions and close combination with the base plate.
Cooling and Forming: After rolling, natural cooling or forced cooling is adopted to cool the steel plate to room temperature, avoiding cracks, deformation and other defects caused by too fast cooling, and ensuring stable plate dimensions and qualified performance.
Finishing Treatment: The cooled checkered plate is straightened, trimmed and cut to adjust the flatness and dimensional accuracy of the plate, remove edge burrs and defects, and ensure the product has a clean appearance and qualified dimensions.
Quality Inspection: The finished products are strictly inspected, including dimensional accuracy, pattern integrity, chemical composition, mechanical properties, surface quality, etc. Unqualified products are all eliminated to ensure that the delivered products meet national standards and customer requirements.
Anti-corrosion Treatment (Optional): According to customer needs, the finished products are galvanized, painted and other anti-corrosion treatments to improve product corrosion resistance and extend service life. After treatment, secondary inspection is carried out to ensure that the anti-corrosion layer is uniform and firm, without falling off, bubbles and other defects.
VII. Main Application Scenarios
With the advantages of anti-slip, load-bearing and high cost performance, this product is widely used in many fields such as industry, construction, transportation, warehousing, covering a variety of scenarios, as follows:
Industrial Field: Factory platforms, workshop walkways, trench covers, equipment pedals, production line operation platforms, mining equipment protection plates, etc., especially suitable for machinery manufacturing, metallurgy, chemical industry, mining and other industries, which can effectively prevent personnel from slipping and ensure production safety.
Construction Field: Stair treads, steel structure walkways, roof anti-slip layers, exterior wall decorative plates, basement passages, parking lot ramps, etc., suitable for various buildings such as residential buildings, factories, shopping malls, office buildings, taking into account both anti-slip and decorative needs.
Transportation Field: Truck floors, trailer floors, container floors, ship decks, wharf platforms, station platform anti-slip layers, etc., which can effectively prevent goods from sliding and personnel from slipping, and adapt to road transportation, ship transportation and other scenarios.
Warehousing and Logistics Field: Warehouse floors, shelf pedals, loading and unloading platforms, logistics passages, etc., which can improve loading and unloading efficiency, prevent goods from sliding when stacked, and ensure the safety of warehousing operations.
Other Fields: Scaffolding planks, temporary passages, garbage disposal equipment protection plates, agricultural machinery chassis, etc., suitable for various temporary or long-term anti-slip and load-bearing scenarios.
VIII. Purchase Points
To ensure that the purchased checkered plate is suitable for the actual use scenario, reduce the use cost and ensure the use safety, it is recommended to purchase from the following points:
Material and Grade Selection: Select according to the load-bearing and weather resistance requirements of the use scenario. For conventional light-load and indoor scenarios, choose Q235B (high cost performance); for heavy-load, outdoor and humid scenarios, choose Q355B (high strength and good impact resistance).
Pattern Type Selection: Choose diamond pattern for scenarios with high anti-slip requirements and easy wetting; choose lentil pattern for scenarios where personnel walk for a long time and pursue comfort; choose round bean pattern for scenarios focusing on aesthetics and general anti-slip needs; choose willow leaf pattern for decorative scenarios.
Thickness Selection: Choose 2.5-5.0mm for light-load scenarios (such as indoor walkways, light pedals); choose 6.0-8.0mm for medium-load scenarios (such as industrial platforms, stair treads); choose 10.0-12.0mm for heavy-load scenarios (such as truck floors, heavy platforms); for ultra-heavy-load scenarios, thicker plates can be customized.
Size Selection: Prioritize conventional widths (1000/1250/1500mm) and lengths (6000mm) to reduce cutting waste; for special scenarios, customize according to needs, and confirm the production cycle and transportation feasibility in advance.
Surface Treatment Selection: For indoor dry scenarios, untreated products can be selected; for outdoor, humid and corrosive scenarios, it is recommended to choose galvanized or painted products to extend service life.
Quality Inspection: When purchasing, check the product quality certificate to confirm that the chemical composition and mechanical properties meet the standards; check the surface quality to ensure that the patterns are clear, free of cracks, rust and burrs, and the dimensional accuracy is up to standard.
IX. Quality Standard and After-sales Guarantee
Quality Standard: Strictly follow the national standards GB/T 3277-2015, GB/T 700-2006 and GB/T 1591-2018. The pattern height is ≥20% of the base plate thickness, the dimensional deviation is controlled within ±0.3mm (thickness) and ±5mm (length/width), the surface has no obvious defects, and the chemical composition and mechanical properties are up to standard.
Inspection Process: Each batch of products undergoes three inspection processes: raw material inspection, process inspection and finished product inspection to ensure stable product quality. Unqualified products are not delivered from the factory, and quality certificates and inspection reports can be provided.
After-sales Guarantee: After the product is delivered from the factory, if there is a quality problem (such as excessive dimensional deviation, pattern falling off, unqualified chemical composition, etc.), after verification, return and exchange services can be provided; technical consultation services are provided to assist customers in selecting appropriate specifications and materials, and answer questions related to installation, processing, anti-corrosion treatment, etc.
X. Packaging and Transportation
Packaging: Wrap with waterproof wrapping paper and plastic film to prevent rust and scratches during transportation; place buffer pads between plates to avoid pattern damage caused by collision and friction; pack in bundles, firmly, and mark product specifications, grades, batches, weights and other information for easy counting and transportation.
Transportation: Transport by flatbed truck to ensure that the plates are placed flat to avoid bending and deformation; do a good job in protection during transportation to avoid rain, sun exposure and collision, and ensure that the products are delivered intact; logistics and distribution can be arranged according to customer needs to directly reach the construction site.
XI. Delivery Cycle
The delivery cycle of this product is 5-7 working days, starting from the date of confirming the order and receiving the advance payment. For large orders or customized products with special specifications, the delivery cycle will be appropriately extended, and the specific time will be confirmed through communication with the customer in advance.
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