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Help CenterFlat Steel & Steel Structure Flat Steel，Q235B、Q355B、20#、45#
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Flat Steel & Steel Structure Flat Steel，Q235B、Q355B、20#、45#NegotiableMOQ: 5 Metric Tons -
Flat Steel & Steel Structure Flat Steel，Q235B、Q355B、20#、45#NegotiableMOQ: 5 Metric Tons
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Flat Steel & Steel Structure Flat Steel，Q235B、Q355B、20#、45#NegotiableMOQ: 5 Metric Tons
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Steel Wire & High Strength Steel Wire，Q195, Q235, 45#, 60#, 65#, 70#NegotiableMOQ: 5 Metric Tons
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Steel Wire & High Strength Steel Wire，Q195, Q235, 45#, 60#, 65#, 70#NegotiableMOQ: 5 Metric Tons
I. Product Overview
Flat steel is a long strip steel with a rectangular cross-section and straight, regular edges. It is mainly produced by hot rolling process, and some products for precision applications can be processed by cold rolling process. The overall size is regular, the surface is flat and smooth, without obvious unevenness, scratches or burrs. It has strong toughness and excellent welding performance, and can easily realize secondary processing such as cutting, bending, drilling, stamping and welding, adapting to various subsequent processing needs. The product has a complete range of specifications and sufficient stock, covering conventional models and non-standard customized models. It is widely used in many fields such as building steel structures, machinery manufacturing, equipment brackets, engineering embedded parts, hardware processing, bridge accessories, power engineering, and agricultural machinery. It can meet various needs such as domestic engineering procurement, enterprise batch stock preparation and foreign trade export. The delivery cycle is 5-7 days after the order is confirmed, which effectively responds to customers' supply needs and ensures the smooth progress of project schedules and production plans.
II. Common Materials and Models
All products are produced with national standard high-quality steel, with pure material, up-to-standard composition, and no problems such as excessive impurities and uneven composition. The mainstream national standard common grades and applicable scenarios are as follows, and you can flexibly select models according to the specific use needs of customers:
Q235B: Ordinary carbon structural flat steel, with extremely strong versatility and outstanding cost performance, is the most widely used model. It has good toughness, easy welding and low processing difficulty. It is suitable for conventional scenarios such as civil construction, ordinary hardware products, various light brackets and simple steel structures, and can meet most non-load-bearing and light load-bearing needs.
Q355B: Low-alloy high-strength flat steel. Compared with Q235B, its yield strength and tensile strength are significantly improved, with strong impact resistance and compression bearing capacity, and higher material stability. It is suitable for scenarios with high strength requirements such as heavy industrial equipment bases, large-scale steel structure projects, heavy-duty components, bridge load-bearing parts and power brackets.
45#: High-quality carbon structural flat steel, with superior hardness and mechanical properties, and high material purity. After quenching and tempering, quenching and other heat treatment, its hardness and wear resistance can be further improved. It is mostly used in precision processing scenarios with high requirements on material performance such as mechanical parts, shafts, precision processing accessories and mold bases.
20#: Low-carbon high-quality carbon steel, with excellent plasticity and welding performance, not easy to have welding cracks, and easy to carry out deep processing such as deep bending and stamping. It is suitable for scenarios such as bent and welded components, thin-walled accessories and hardware stamping parts that require complex forming.
III. Specification Range
The product specifications are comprehensive, with sufficient stock of conventional models. Non-standard specifications can be customized and produced according to customer drawings and use needs to accurately match the use of various scenarios. The specific specifications are as follows:
Thickness: Conventional 3mm–60mm, non-standard thickness of 1mm–80mm can be customized. The thickness tolerance is strictly controlled, with a positive and negative error of no more than 0.3mm, ensuring uniform thickness and adapting to subsequent processing and installation needs.
Width: Conventional 20mm–200mm. The standing stock covers common sizes such as 20mm, 30mm, 50mm, 80mm, 100mm, 150mm and 200mm. Non-standard width of 15mm–300mm can be customized.
Fixed length: Conventional fixed lengths are 6m, 9m and 12m. Non-standard fixed-length cutting can be carried out according to customer needs, with high cutting precision, no burrs and no deformation. The longest can be customized to 20m ultra-long size to meet the use needs of large-scale projects and special equipment.
Process: Hot-rolled flat steel (suitable for conventional load-bearing and general scenarios), cold-rolled flat steel (suitable for precision processing and scenarios with high surface requirements), non-standard customized flat steel (adjust cross-sectional size and process parameters as needed).
Surface: Hot-rolled black surface (conventional and general, low cost), pickled surface (removing oxide scale, flat surface, easy for subsequent painting and galvanizing), shot blasting and derusting surface (thorough derusting, improving anti-corrosion performance, suitable for outdoor and humid environments).
IV. Chemical Composition Table (Mass Fraction %)
Material Grade |
Carbon (C) |
Silicon (Si) |
Manganese (Mn) |
Phosphorus (P) ≤ |
Sulfur (S) ≤ |
Remarks |
Q235B |
0.12–0.20 |
≤0.30 |
0.30–0.70 |
0.045 |
0.045 |
Universal type, stable composition |
Q355B |
≤0.20 |
≤0.55 |
1.00–1.60 |
0.035 |
0.035 |
Low alloy, high strength |
20# |
0.17–0.23 |
0.17–0.37 |
0.35–0.65 |
0.030 |
0.030 |
Low carbon, good plasticity |
45# |
0.42–0.50 |
0.17–0.37 |
0.50–0.80 |
0.030 |
0.030 |
Medium carbon, high hardness |
Note: The above chemical compositions all comply with the national standards of GB/T 700-2006 (Carbon Structural Steel) and GB/T 3077-2015 (Alloy Structural Steel). The composition parameters can be adjusted and customized production services can be provided according to the special needs of customers.
V. Mechanical Performance Characteristics
Q235B: Tensile strength ≥ 375MPa, yield strength ≥ 235MPa, elongation ≥ 26%. It has good toughness, easy welding and low cost, with stable comprehensive service performance. It can be directly put into use without complex heat treatment, adapting to most general scenarios.
Q355B: Tensile strength ≥ 470MPa, yield strength ≥ 355MPa, elongation ≥ 21%. It has strong impact resistance and compression bearing capacity, stable performance in low temperature environment, and is not easy to be brittle. It is suitable for heavy-duty structures, outdoor projects and other scenarios with high requirements on strength and stability.
20#: Tensile strength ≥ 410MPa, yield strength ≥ 245MPa, elongation ≥ 25%. It has high material purity and excellent plasticity, and good welding performance. It can carry out deep processing such as deep bending and stamping, and is not easy to have cracks and deformation, adapting to precision processing scenarios.
45#: Tensile strength ≥ 600MPa, yield strength ≥ 355MPa, elongation ≥ 16%. It has high hardness and good wear resistance. After tempering treatment, its mechanical performance can be further improved, which is suitable for mechanical parts that need to bear large loads and require high wear resistance.
VI. Core Product Advantages
High dimensional accuracy: Advanced rolling and cutting equipment are adopted, and the dimensional tolerance is strictly implemented in accordance with national standards. The error of length, width and thickness is small, the edges are free of burrs, the straightness is good, the installation and splicing are tight, no additional grinding processing is needed, and the subsequent construction and processing costs are reduced.
Reliable material quality: High-quality original steel billets are selected, with pure material and uniform composition, without quality defects such as inclusions, pores and cracks. After strict smelting and rolling processes, the product is not easy to deform or break as a whole, and has a long service life.
Flexible specification selection: There is a large stock of conventional models with spot supply and fast delivery; non-standard specifications can be customized according to customer needs, covering multiple dimensions such as thickness, width, length and surface treatment, accurately matching various use scenarios.
Strong processing adaptability: It can easily realize secondary processing such as cutting, bending, drilling, welding, stamping and heat treatment. It is not easy to have cracks and deformation during processing, adapting to various processing technologies and meeting the processing needs of different customers.
Guaranteed packaging and transportation: It is bundled and packed with national standard steel strips, with protective sleeves installed at the ends and covered with rainproof tarpaulin outside, which is moisture-proof, anti-collision and anti-rust. It is suitable for various transportation methods such as sea transportation, land transportation and air transportation to ensure that the products are delivered to customers intact.
Traceable quality: Material certificates and quality inspection reports are provided when leaving the factory. Each batch of products has undergone strict physical and chemical testing and appearance testing to ensure that the product quality meets national standards and customer requirements, and the quality is traceable and guaranteed.
VII. Main Uses
The product has a wide range of application scenarios, covering many industries such as construction, machinery, electric power, bridges, agriculture and hardware. The specific uses are as follows:
Construction field: Steel structure embedded parts, plant frames, floor load-bearing brackets, curtain wall accessories, guardrail railings, stair handrails, roof supports, etc.;
Machinery manufacturing field: Equipment bases, mechanical frames, parts processing, shaft accessories, mold bases, stamping raw materials, etc.;
Power engineering field: Power brackets, transformer bases, cable brackets, telegraph pole accessories, etc.;
Bridge engineering field: Bridge load-bearing components, bridge auxiliary accessories, embedded parts, etc.;
Hardware processing field: Hardware accessories, tools, fasteners, stamping parts, bending parts, etc.;
Other fields: Agricultural machinery accessories, shelf steel structures, storage equipment, pipeline fixtures, outdoor facilities, etc.
VIII. Packaging and Delivery
Packaging method: Bundled and packed with national standard steel strips, the weight of each bundle is controlled at 1-5 tons. The bundling density is adjusted according to the product size, and protective sleeves are installed at the ends to prevent collision damage during transportation; for outdoor transportation or humid environment needs, additional rainproof tarpaulin and moisture-proof packaging can be added to effectively prevent product rust.
Deep processing services: Anti-corrosion treatment services such as sandblasting, painting, hot-dip galvanizing and cold galvanizing can be provided according to customer requirements to improve the oxidation resistance and corrosion resistance of products, extend the service life, and adapt to outdoor, humid and other special environments; at the same time, pre-processing services such as fixed-length cutting, drilling and bending can be provided to reduce the subsequent processing procedures of customers.
Delivery cycle: Conventional models are in stock, and delivery is arranged within 24 hours after the order is confirmed, with a delivery cycle of 5-7 days; for non-standard customized products, production is reasonably arranged according to the customized specifications and batch size, with a delivery cycle of 7-15 days, which can flexibly match various project schedules and enterprise production plans.
Transportation method: According to the customer's location and purchase volume, land transportation, sea transportation, air transportation and other transportation methods can be selected. Cooperating with many logistics enterprises to ensure efficient and safe delivery of products, and at the same time, logistics tracking services can be provided to allow customers to keep abreast of the cargo transportation status.
IX. Quality Assurance and After-sales Service
The products are strictly produced in accordance with national standards such as GB/T 700-2006 and GB/T 3077-2015. Each batch of products has undergone strict quality inspection to eliminate unqualified products from leaving the factory. At the same time, we provide professional technical consulting services, offering customers selection suggestions, processing guidance and other support to help customers use the products efficiently.
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