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Z-Shaped Steel, also known as Z Purlin or Z Section, is a cold-formed structural steel profile widely used in roofing systems, wall cladding, solar mounting brackets, and metal building frameworks. Its "Z" geometry offers excellent load distribution, high sectional strength, and ease of overlapping, making it more efficient than traditional C-shaped profiles for long-span structures. With options for hot-dip galvanizing, pre-galvanized coating, and various high-strength steel grades, Z-shaped steel provides outstanding durability and corrosion resistance for industrial, commercial, and agricultural building projects.
Keywords: Z-Shaped Steel, Galvanized Z Purlin, Steel Z Channel, Z Section Steel, Cold-Formed Z Purlin, Metal Building Purlins, Z Purlin for Roof & Wall Systems
Standard Sizes
| Section Height (H) | Flange (A/B) | Lip (C) | Thickness (t) | Common Grades | Surface Finish |
|---|---|---|---|---|---|
| 100 mm | 40–60 mm | 15–20 mm | 1.5–3.0 mm | Q235 / Q345 / S280GD / S350GD | Pre-Galvanized / HDG |
| 120 mm | 40–70 mm | 15–20 mm | 1.5–3.0 mm | Q235 / Q345 / S350GD | Pre-Galvanized / HDG |
| 140 mm | 50–70 mm | 15–20 mm | 1.5–3.0 mm | S350GD / S390GD | Pre-Galvanized / HDG |
| 160 mm | 50–80 mm | 15–25 mm | 1.5–3.0 mm | S350GD / S420GD | Pre-Galvanized / HDG |
| 180 mm | 60–80 mm | 15–25 mm | 1.5–3.0 mm | S420GD / S450GD | HDG / Custom |
| 200 mm | 60–85 mm | 15–25 mm | 1.5–3.0 mm | Q345 / S350GD | HDG / Custom |
Z-Shaped Steel Specifications
| Parameter | Metric | Imperial |
|---|---|---|
| Height (Web) | 100 – 300 mm | 4" – 12" |
| Flange Width | 40 – 80 mm | 1.6" – 3.1" |
| Thickness | 1.5 – 3.5 mm | 0.059" – 0.138" |
| Length | 3 m – 12 m | 10 ft – 40 ft |
| Surface | Galvanized / Black Steel | |
| Production Method | Cold Roll Formed |
Custom sizes and punching holes can be manufactured according to project requirements.
Common Z Purlin Size Chart
| Size (mm) | Thickness (mm) | Weight (kg/m) |
|---|---|---|
| Z100 × 50 | 1.8 – 2.5 | 3.8 – 5.2 |
| Z120 × 50 | 1.8 – 2.5 | 4.3 – 5.8 |
| Z150 × 60 | 2.0 – 3.0 | 6.0 – 8.6 |
| Z180 × 70 | 2.0 – 3.0 | 7.2 – 9.8 |
| Z200 × 70 | 2.0 – 3.0 | 8.1 – 10.7 |
| Z250 × 75 | 2.5 – 3.5 | 10.5 – 13.8 |
Material Grades
Z-shaped steel is commonly manufactured using high-strength galvanized steel.
| Standard | Grade |
|---|---|
| ASTM | ASTM A653 SS / ASTM A653 G550 |
| EN | S350GD / S450GD |
| GB | Q235 / Q345 |
These materials ensure excellent structural strength and long-term durability.
Surface Treatment Options
| Surface Type | Description |
|---|---|
| Hot-Dip Galvanized | Zinc coating for corrosion protection |
| Pre-Galvanized | Steel coil galvanized before roll forming |
| Painted | Additional coating for aesthetic and environmental protection |
Typical zinc coating thickness ranges from 60 g/m² to 275 g/m².
Key Features of Z-Shaped Steel
High Structural Efficiency
The Z-shaped profile provides excellent bending resistance and load distribution for roofing and wall structures.
Lightweight Construction
Compared with traditional structural beams, Z purlins reduce the overall structural weight while maintaining strength.
Easy Installation
Z-shaped steel sections allow overlapping installation, improving structural stability and reducing installation time.
Excellent Corrosion Resistance
Galvanized coatings protect the steel from rust and environmental corrosion.
Cost-Effective Structural Solution
The combination of high strength, lightweight design, and efficient installation makes Z-shaped steel a cost-effective choice for modern construction projects.
Typical Applications
Z-shaped steel is widely used in steel structure construction and industrial building projects.
Steel Structure Buildings
Primary support components for industrial buildings and steel frameworks.
Roofing Systems
Roof purlins used to support metal roofing sheets.
Wall Girts
Structural members for wall cladding systems.
Warehouses and Factories
Commonly used in large-span warehouse and factory structures.
Agricultural Buildings
Greenhouses, barns, and storage facilities.
Inspection & Quality Assurance
All Z-shaped steel products are manufactured under strict quality control standards.
Inspection procedures include:
Raw material inspection
Dimensional measurement
Thickness testing
Zinc coating thickness testing
Surface quality inspection
Structural strength verification
Third-party inspections such as SGS, BV, TUV, or Intertek are available upon request.
Products can be supplied with Mill Test Certificate (MTC EN 10204 3.1).
Product Delivery Standards
To ensure safe international transportation, Z-shaped steel sections are packaged according to export standards.
Standard packaging includes:
Bundled with steel straps
Waterproof plastic wrapping
Bundle identification labels
Steel pallets or wooden pallets for export
Available shipping terms:
FOB
CFR
CIF
DDP
Customized marking, labeling, and packaging are available based on project requirements.
Mechanical Properties (Typical Cold-Formed Structural Steel)
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) |
|---|---|---|
| Q235 | ≥ 235 MPa | 375–500 MPa |
| Q345 | ≥ 345 MPa | 470–630 MPa |
| S280GD | ≥ 280 MPa | ≥ 360 MPa |
| S350GD | ≥ 350 MPa | ≥ 420 MPa |
| S420GD | ≥ 420 MPa | ≥ 480 MPa |
Features
Lightweight but high strength due to optimized Z geometry.
Excellent spanning capability for roofing frameworks.
Galvanized corrosion protection for outdoor and industrial use.
Easy overlapping design reduces installation time and cost.
Compatible with solar mounting systems, steel workshops, barns, and all metal buildings.
Performance Characteristics
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Good mechanical properties
Z-shaped steel has strong bending capacity and, under the same load, saves more material than ordinary steel, effectively reducing the self-weight of the building structure and improving the safety and stability of the structure.
-
Convenient construction: The regular shape of Z-shaped steel makes it easy to cut, drill, and assemble, which can improve construction efficiency and shorten construction periods. At the same time, its high standardization is conducive to industrial production.
-
Aesthetic appearance
The cross-section of Z-shaped steel is simple and smooth, with a flat and smooth surface, meeting the needs of some projects with high requirements for building aesthetics.
Production process
Raw Material Preparation: Select hot-rolled strip steel or steel plates that meet the standards as raw materials, and conduct quality inspection to ensure that the chemical composition and mechanical properties of the materials meet the requirements.
Uncoiling and Leveling: Unroll the raw material coil using an uncoiler and level it using a leveling machine to ensure the flatness of the raw materials.
Cold Bending Formation: Send the leveled strip steel into a cold bending forming machine, where it is gradually bent into the shape of Z-shaped steel through a series of continuous rollers.
Cutting: Cut the formed Z-shaped steel to the required length using a shearing machine or saw.
Surface Treatment: To improve the corrosion resistance and appearance of the Z-shaped steel, surface treatments such as galvanizing or spraying can be applied.
Application fields
Roof & Wall Purlins for steel buildings
Solar Photovoltaic Mounting Systems
Industrial and Agricultural Sheds
Commercial Warehouses & Logistics Centers
Prefabricated & Modular Buildings
Wind and Sand Protection Structures
Support framing for panels, cladding, and insulation
Construction Field
In buildings such as industrial plants, warehouses, and stadiums, Z-shaped steel is often used as structural components like purlins and wall beams, effectively reducing the self-weight of the building and improving its load-bearing capacity.
01
Automotive Manufacturing
It is used for manufacturing parts like car frames and bodies, which can reduce the weight of the car and improve fuel efficiency.
02
Transportation
In areas like railways and bridges, Z-shaped steel can be used to make bridge structural components and railway track supports, offering good mechanical performance and durability.
03
Agricultural Field
It can be used to build agricultural facilities like greenhouses and livestock barns, with advantages such as easy installation and low cost.
04
Specifications and dimensions
The specifications of Z-shaped steel are usually expressed in terms of height (h), flange width (b), web thickness (t1), and flange thickness (t2), with units in millimeters (mm).
Main features and advantages
Z-shaped cross-section
The cross-section shape of Z-shaped steel is Z-shaped, with two parallel flanges and a vertical web, giving it good bending resistance and load-bearing capacity.
Lightweight and high strength
Z-shaped steel is usually made of high-quality steel, has high strength and stiffness, and is relatively light in weight. It is suitable for structures with high load-bearing requirements but light weight requirements.
FAQ for Z-Shaped Steel (Z Purlin)
1. What is the main advantage of Z-shaped steel compared with C-shaped steel?
Z-shaped steel allows overlapping at joints, providing better continuity and increased span capacity-ideal for long roof spans.
2. What coating thickness do you offer for galvanizing?
Pre-galvanized: Z120–Z275
Hot-dip galvanized: 70–120 μm, up to 200 μm for coastal or high-corrosion areas.
3. Can Z-shaped steel be supplied with pre-punched holes?
Yes. We provide CNC punching per your roof layout, solar bracket requirements, or structural design drawings.
4. What is the maximum length you can supply?
Common length: 4–12 meters
Max length: 15 meters (subject to container loading).
5. Which steel grade is best for high-strength purlin systems?
For higher load-bearing structures, S350GD, S420GD, or Q345 are recommended.
6. Can Z purlins be used for solar photovoltaic mounting frames?
Yes. Many ground-mount and rooftop PV systems use galvanized Z-sections for framing, rails, and beam supports.
7. What standards do your Z-shaped steel products meet?
We comply with ASTM, EN, ISO, and Chinese GB standards. MTC (EN 10204 3.1) is provided.
8. How is straightness and dimensional tolerance controlled?
Cold-forming machines use servo control and rollers, following EN 10346 / GB/T 2518 dimensional tolerances.
9. Do you support anti-rust treatment on cut edges after fabrication?
Yes. Zinc-rich epoxy paint is applied to ensure full edge protection.
10. What packaging is used for export shipments?
Bundled with steel straps + waterproof wrapping.
Customized pallet packing is available for solar EPC and construction contractors.
If you are sourcing Z-shaped steel / galvanized Z purlin for metal buildings, solar projects, or industrial fabrication, our engineering and quality team is ready to support your project.
📩 Send us your drawings or project specifications - we reply fast and support both small orders and large EPC procurement.
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
office@dongmjd.com
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