{"id":835800,"date":"2026-09-15T17:50:02","date_gmt":"2026-09-15T17:50:02","guid":{"rendered":"https:\/\/www.abnewswire.com\/pressreleases\/?p=835800"},"modified":"2026-09-15T17:50:02","modified_gmt":"2026-09-15T17:50:02","slug":"s350gd-and-q355-steel-present-different-options-for-solar-pv-mounting-system-design","status":"publish","type":"post","link":"https:\/\/www.abnewswire.com\/pressreleases\/s350gd-and-q355-steel-present-different-options-for-solar-pv-mounting-system-design_835800.html","title":{"rendered":"S350GD and Q355 Steel Present Different Options for Solar PV Mounting System Design"},"content":{"rendered":"

Jinghai, Tianjin<\/strong>, China – September 15<\/strong>, 2026<\/strong><\/p>\n

For any Solar Pv System<\/strong><\/a>, the steel underneath the panels decides both lifespan and budget. Two grades keep showing up in Mounting Systems<\/strong><\/a> bills of materials: S350GD+ZM275 and Q355. Engineers and procurement teams routinely treat them as interchangeable, and the confusion is easy to see. Both deliver yield strength around 350 MPa. Both handle Ground Mounting Solar frames well. But once you look at how they are made, coated and priced, real differences appear that matter the day the order goes out.<\/p>\n

Close on paper, different in the workshop<\/p>\n

Q355 is a hot-rolled structural steel. You cut and form the profiles first, then hot-dip galvanize the finished parts to reach at least 55 μm coating thickness. It works to the Chinese steel-structure standard GB50017, suits both thin 2–3 mm sections and heavier 8–16 mm members, and turns up across general steel structures as well as Solar Panel Mounting<\/strong><\/a>.<\/p>\n

S350GD+ZM275 follows another route. The base is cold-rolled coil, pre-coated at the mill with a zinc-aluminum-magnesium layer totalling 275 g\/m² across both sides. It is built for C4–C5 corrosion environments and follows Eurocode EN1993 for cold-formed thin-wall steel. Because it ships as coated coil, it only comes in thin gauges and is usually roll-formed into U-channels for purlins, posts and diagonal braces in Ground Mounting Solar projects. A typical S350GD Mounting Systems BOM relies on U41×41×2.0 purlins, front and rear posts, triangle connectors and back tie rods all cut from the same coated coil, so the whole rack shares one coating specification.<\/p>\n

Q355 projects take a different bill of materials. Main purlins run longer, often U41×52×2.0 in 6000+1000 lengths, with Q355B posts, diagonal braces and back braces plus Q235B hinge and purlin connectors. Clamps in both designs stay 6005-T5 aluminum with stainless fasteners, while anchors and bolts shift between hot-dip galvanized Q235B and Grade 8.8 sets depending on the drawing. That is why swapping one grade changes more than the part name—it reshuffles the entire Mounting Systems supply chain.<\/p>\n

\"Solar<\/a><\/p>\n

The numbers that matter<\/p>\n

Yield strength is where the two look identical: Q355 gives 355 MPa, S350GD gives 350 MPa. Tensile values sit basically the same, and both meet the design strength in the standard tables. With an identical cross-section and thickness, Q355 keeps a slightly larger strength margin, so if you swap S350GD in for a primary load-bearing member, the bearing capacity drops by roughly 1.4 percent.<\/p>\n

For a small-span Ground Mounting Solar<\/strong> array, that gap is tolerable and substitution usually works. For large-span structures carrying the main loads, most engineers advise staying with Q355 to hold onto the extra safety margin. It is a judgment call about spans and safety factors, not a blanket rule.<\/p>\n

Coating and Costs<\/p>\n

Coating is not the same thing:<\/strong> Both grades can be protected against corrosion, but the protection is applied differently. Q355 relies on post-fabrication hot-dip galvanizing, with average coating thickness held to no less than 55 μm. S350GD+ZM275 gets its Zn-Al-Mg coating at the steel mill, which means uniform coverage and better cut-edge protection in harsh C4–C5 sites.<\/p>\n

What it costs:<\/strong> Finished S350GD+ZM275 coil generally costs more than Q355 plus galvanizing. The gap is the price you pay for factory-applied coating on thin sections, and it often decides which way a budget-driven Ground Mounting Solar tender swings.<\/p>\n

So which one should you pick?<\/p>\n

There is no single “better” material for Solar Panel Mounting<\/strong>. Choose Q355 when you need flexible section sizes, heavier members or the lowest material-plus-galvanizing cost. Choose S350GD+ZM275 when you want factory-applied anti-corrosion performance on thin, cold-formed parts and are willing to pay for it. Match the grade to your span, your site corrosion level and your total budget, and your Solar Pv<\/strong> System will hold up for the years you planned.<\/p>\n

 <\/p>\n

About Us<\/strong><\/p>\n

Tianjin Yuantai Hexin International Trade Co., Ltd. is a professional trading joint venture jointly established by Tianjin Yuantai Derun Steel Pipe Manufacturing Group and Hanzhong Hexin Metal Products Co., Ltd. We provide one-stop supply solutions of steel pipes, hollow section, square and rectangular pipes, photovoltaic brackets, steel strand, PC strand and matching steel materials for global construction, new energy and offshore platform projects.<\/p>\n

Media Contact<\/span>
Company Name:<\/strong> Tianjin Yuantai Hexin International Trade Co., Ltd.<\/a>
Contact Person:<\/strong> Media Relations
Email:<\/strong> Send Email<\/a>
Country:<\/strong> China
Website:<\/strong> https:\/\/www.ythxsteel.com\/<\/a><\/p>\n

\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

Jinghai, Tianjin, China – September 15, 2026 For any Solar Pv System, the steel underneath the panels decides both lifespan and budget. Two grades keep showing up in Mounting Systems bills of materials: S350GD+ZM275 and Q355. Engineers and procurement teams … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[401,410,403,404,416],"tags":[],"class_list":["post-835800","post","type-post","status-publish","format-standard","hentry","category-Business","category-Manufacturing-Industry","category-UK","category-US","category-World"],"_links":{"self":[{"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/posts\/835800","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/comments?post=835800"}],"version-history":[{"count":0,"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/posts\/835800\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/media?parent=835800"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/categories?post=835800"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.abnewswire.com\/pressreleases\/wp-json\/wp\/v2\/tags?post=835800"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}