Set 1
Q: What's the relation between S355 and Q355 angle bars?
A: S355 is a European standard (EN 10025) high-strength alloy steel, while Q355 is its Chinese equivalent (GB/T 1591). Both have minimum yield strength of 355 MPa, making them interchangeable in most high-strength scenarios. They share similar chemical compositions (e.g., C ≤0.22%, Mn ≤1.60%) and mechanical properties. The main difference lies in regional standard compliance-S355 is common in Europe, Q355 in China. We supply both grades, and can recommend the right one based on your project's standard requirements.
Q: What equal width sizes do these angle bars come in?
A: Equal width S355/Q355 angle bars range from 25x25mm to 200x200mm, with thicknesses 3mm to 25mm. Popular sizes like 50x50x5mm, 63x63x8mm, 80x80x6mm are always in stock for quick delivery. We offer custom equal widths for non-standard projects, with dimensional tolerance ±0.5mm for leg length to ensure assembly fit. Each size undergoes strict rolling checks to maintain consistent width and thickness. You can check our stock list or share custom specs for a production timeline.
Q: Why are they suitable for high-strength construction?
A: Their 355 MPa minimum yield strength enables them to bear heavy loads, ideal for high-rise building frames, bridge supports, and large-span structures. They have excellent tensile strength (470-630 MPa) and ductility, resisting deformation under stress. The alloy composition (with Nb, V, Ti) enhances fatigue resistance, critical for long-term structural stability. Many mega-projects (e.g., stadiums, industrial plants) use them to reduce material weight while ensuring safety. They meet international construction standards for high-strength structural components.
Q: What's the MOQ for S355/Q355 angle bars?
A: Standard MOQ is 1 ton for common equal width sizes (e.g., 50x50mm, 63x63mm) of both grades. For less common sizes or custom thicknesses, MOQ is 2-3 tons due to production setup. We're flexible for trial orders-smaller quantities can be negotiated if you're testing materials for your project. Bulk orders over 10 tons get lower unit prices and priority production. We'll clarify MOQ and pricing based on your grade, size, and quantity needs.
Q: How long is delivery for these angle bars?
A: In-stock equal width sizes (e.g., 50x50x5mm) ship within 3-5 working days. For custom sizes or less common grades, production takes 7-14 working days plus shipping. Delivery time depends on location: nearby areas take 2-3 days, international sea shipping takes 2-5 weeks. We provide tracking numbers once shipped and update you on production progress for custom orders. Rush delivery is available for urgent needs with a small extra fee.
Set 2
Q: What surface treatments are available for these angle bars?
A: Common treatments include hot-dip galvanizing, mill finish, and epoxy coating. Hot-dip galvanizing adds a zinc layer, offering corrosion resistance for outdoor/ humid construction sites (service life up to 25 years). Mill finish is cost-effective for indoor structural parts or temporary use. Epoxy coating provides color options and chemical resistance, ideal for industrial workshops. We also offer phosphate treatment to improve paint adhesion. Choose based on your project's environment and protection needs-we can advise on the most suitable option.
Q: Can you cut these angle bars to custom lengths?
A: Yes, we provide precision cutting for S355/Q355 angle bars. You can specify lengths from 1m to 12m, with common custom lengths 3m, 6m, 9m. We use CNC cutting machines to ensure smooth edges and length tolerance ±1mm. A small fee applies for custom cutting, varying by quantity and complexity. For large orders, we can pre-cut holes if you provide a drilling layout. Cut bars are ready for on-site installation, saving your processing time and labor costs. We'll confirm cutting details and fees before production.
Q: Do you provide quality certificates for these angle bars?
A: Absolutely-every batch comes with a compliant quality certificate. For S355, we provide EN 10204 3.1 certificates including tensile/yield strength, impact test data, and chemical composition. For Q355, certificates meet GB/T 1591 standards, with details like C ≤0.22%, Mn ≤1.60%. Certificates also include dimensional inspection and production records. We send electronic copies via email after shipment, and paper copies can be included with goods. These certificates are recognized for global construction project acceptance.
Q: How much does 1m of equal width angle bar weigh?
A: Weight per meter depends on width and thickness, following the formula: (2×width - thickness) × thickness × 0.00785. For example, 50x50x5mm weighs ~3.77 kg/m, 63x63x8mm ~7.55 kg/m, 80x80x6mm ~7.37 kg/m. We provide a detailed weight chart for all equal width sizes to help calculate total order weight and shipping costs. The weight is consistent for S355 and Q355 due to identical density. Just share the size and quantity, and we'll give you the exact total weight quickly.
Q: Are these angle bars easy to weld for construction?
A: Yes, S355/Q355 have excellent weldability, crucial for construction assembly. They work with common methods: arc welding, MIG welding, TIG welding. For thicknesses ≤16mm, no pre-heating is needed; thicker sections (>25mm) require pre-heating to 100-150°C to avoid cold cracks. Welded joints retain ~85-90% of base material strength, ensuring structural integrity. Many construction fabricators prefer them for consistent weld quality. We can provide welding guidelines (e.g., electrode type, current settings) if you need technical support.
Set 3
Q: Which construction projects use these angle bars most?
A: They're widely used in high-rise building frames (columns, beams), bridge load-bearing structures, and large-span roof trusses. Industrial plant structures (e.g., factory workshops, power stations) rely on them for heavy-load supports. They're also used in stadiums, exhibition centers, and offshore platforms due to high strength. Prefabricated construction firms use them for modular structural components. Infrastructure projects like viaducts and railway supports often specify S355/Q355 for long-term durability. Their versatility makes them a top choice for high-strength construction needs.
Q: Can I get samples before bulk ordering?
A: Yes, we offer free samples (up to 2 pieces) for standard equal width sizes-you only pay shipping. Samples ship within 2-3 working days and match bulk product quality. For custom samples (specific thickness/ treatment), a small fee applies, refundable upon bulk order. Each sample includes a mini quality certificate for testing (hardness, weldability). Many customers test samples for project compliance (e.g., matching design specs) before ordering. Just tell us the grade, size, and quantity of samples, and we'll arrange shipment quickly.
Q: What's the chemical composition of S355/Q355?
A: Key components (max limits) are similar for both grades: C ≤0.22%, Mn ≤1.60%, Si ≤0.55%, P ≤0.035%, S ≤0.035%. They also contain micro-alloying elements (Nb ≤0.05%, V ≤0.12%, Ti ≤0.20%) to enhance strength without reducing ductility. Low P/S content minimizes brittleness, critical for construction safety. These elements are strictly controlled during production to meet standard requirements. We provide detailed composition reports in quality certificates-ask if you need specific element data for your project.
Q: How are these angle bars packaged for shipping?
A: Standard packaging: angle bars are bundled with 2-3 steel straps every 1-1.5m to prevent shifting. Each bundle is wrapped in waterproof PE film to protect from moisture/dust. For sea shipping or long distances, we add wooden pallets (40x40cm) to avoid ground contact. Custom packaging (anti-rust oil, moisture-proof paper) is available for overseas or humid destinations. Bundle weight is 500-1000kg for easy handling. Each bundle is marked with grade, size, length, and batch number for quick identification on construction sites.
Q: Do you offer discounts for large construction orders?
A: Yes, quantity discounts apply. Orders 5-10 tons get 3% off, 10-20 tons 5% off, and over 20 tons 8-12% off. Discounts are higher for in-stock sizes than custom ones. Repeat construction customers get an extra 2% loyalty discount. Combining multiple equal width sizes in one order also qualifies for better pricing. We provide detailed quotations with discounts clearly listed. For mega-projects (over 50 tons), we can negotiate special pricing. Just share your order details, and we'll give you the most competitive offer.
Set 4
Q: What's the maximum length for these angle bars?
A: Standard maximum length is 12 meters for equal width sizes up to 100x100mm. For larger sizes (125x125mm and above), max length is 10 meters due to production/ transport limits. Longer lengths (up to 15 meters) can be custom-produced for specific projects but need flatbed trucks for shipping to avoid bending. We assess transport feasibility (road restrictions, loading capacity) before confirming long lengths. Shorter lengths (3-6m) are popular for construction as they're easier to handle on-site. We'll advise the best length based on your project's logistics.
Q: Can these angle bars be used in cold construction environments?
A: Yes, but choose the right sub-grade. S355J2/Q355D are designed for cold environments, with impact test requirements at -20°C. S355J0/Q355C work for 0°C conditions, while standard S355JR/Q355B suit ambient temperatures (+20°C). Using non-cold-resistant grades in low temperatures risks brittle fracture. We've supplied S355J2/Q355D to construction projects in northern Europe and China with excellent performance. If your project is in a cold region, we recommend these sub-grades and provide low-temperature impact test reports.
Q: How do you ensure quality for construction use?
A: We have a 5-step QC process tailored for construction standards. First, raw material inspection (certificate verification, composition testing). Second, in-process checks: rolling temperature, dimensional accuracy. Third, mechanical testing: tensile, yield, impact tests (critical for construction safety). Fourth, surface inspection: no cracks/scratches that affect structural integrity. Fifth, final inspection: length, thickness, packaging. Random third-party testing is available for project audits. This ensures 99.9% qualification-critical for construction where safety is paramount. Defective products are rejected immediately.
Q: What payment terms do you accept for construction orders?
A: Flexible terms for construction needs. Standard orders: 30% advance (T/T), 70% balance before shipment. Large orders (over 20 tons): 20% advance, 70% before shipment, 10% after on-site acceptance (30-day credit). L/C at sight is accepted for international projects. Small sample orders: PayPal/ Western Union. Alibaba Trade Assurance is available for payment security. Currency is USD, but EUR/GBP/RMB can be arranged. Long-term construction partners get negotiable terms (e.g., extended credit). We'll align terms with your project's payment schedule.
Q: Is there a warranty for construction applications?
A: 12-month warranty from delivery, covering manufacturing defects: dimensional deviations beyond standards, unqualified mechanical properties, surface rust from poor packaging. It excludes damage from improper use (overloading, wrong welding) or on-site handling. If defects occur, send photos/certificates-we arrange replacement/refund within 7 days. For large projects, we send technicians for on-site inspection. We understand construction delays are costly, so we prioritize after-sales support. Many construction firms trust us for reliable quality and warranty coverage.
Set 5
Q: Can these angle bars be drilled/punched for construction?
A: Yes, they're easy to machine with moderate hardness (160-180 HB). We offer pre-drilling/punching services: hole diameters 4-30mm, spacing per your construction drawings. CNC machines ensure hole position accuracy (±0.3mm) and clean edges. Pre-machined bars save on-site processing time-critical for tight construction schedules. For thick bars (>15mm), high-speed drills avoid burrs. S355/Q355's ductility prevents cracking during machining. Just provide your drilling layout (e.g., for bolted connections), and we'll deliver ready-to-install bars.
Q: How do these angle bars compare to Q235 in construction?
A: S355/Q355 have 50% higher yield strength (355 MPa vs. 235 MPa for Q235), supporting heavier loads with less material. They're more durable (better fatigue resistance) for long-term construction. Q235 is cheaper but needs larger cross-sections for the same load, increasing weight/costs. S355/Q355 are ideal for high-rise/heavy-load projects, Q235 for light structures. Using S355/Q355 reduces construction material quantity and transportation costs. We help compare both based on your project's load calculations to optimize cost and performance.
Q: Are these angle bars recyclable for green construction?
A: 100% recyclable-made of carbon alloy steel, one of the most recycled materials. Recycled S355/Q355 retains original strength, fitting green construction goals (e.g., LEED certification). Many eco-friendly projects use them to reduce carbon footprint. We source raw materials from recycled suppliers where possible. Recycling also cuts waste, aligning with sustainable construction practices. Choosing these bars supports your project's environmental commitments without compromising strength. We can provide eco-friendly certificates if your project requires them.
Q: How to calculate quantity for my construction project?
A: First, list each component's angle bar length (e.g., 4m per roof truss brace). Multiply by component quantity for total length. Use weight-per-meter (from our chart) to get total weight. Add 5-10% for cutting waste/ replacements. Example: 200 braces ×4m=800m; 800m×3.77kg/m (50x50x5mm)=3016kg; +10%→3317kg (order ~3.4 tons). Share your construction drawings/ bill of materials-our team (with construction experience) will calculate accurately. We avoid over-ordering (saving cost) or under-ordering (delaying projects).
Q: Can you ship these angle bars to construction sites internationally?
A: Yes, we ship to 60+ countries, with experience delivering to construction sites. We work with freight forwarders for sea (FCL/LCL), air, or land transport. Sea shipping takes 2-6 weeks (China→Europe: 4 weeks, China→US: 3 weeks). We handle export docs: commercial invoice, packing list, bill of lading, quality certificate. Door-to-door delivery to your construction site is available. Import duties/taxes are your responsibility, but we provide accurate docs for customs clearance. We've delivered to projects in Australia, UAE, and Brazil-tracking numbers let you monitor shipment for on-time site arrival.
