Explore our highly integrated steel production portfolio manufactured to dynamic structural and architectural standards.
Specially designed corrosion-resistant pre-galvanized elliptical tubes for heavy-duty construction and architectural frames.
High yield strength structural iron angle bars designed to bear massive structural loads in industrial setups.
Premium 15x15 mm galvanized hollow section tubing, providing robust protection and lightweight durability.
Q235B class pre-galvanized round steel tubing designed for heavy fabrication, furniture structures, and framing.
Custom color-coated corrugated steel coil in RAL 9040 finish. Designed for weather-tight exterior roofing.
Exceptional Q235 grade hot-dipped zinc steel coil with heavy Z275 spangle coating for extreme corrosion defense.
High ductility Q195 hollow structural section steel tube, optimized for processing, bending, and welding.
Durable PPGI pre-painted galvanized steel coils, coated with protective premium powder coatings.
Carbon steel sheet products represent the bedrock of global structural engineering, automotive chassis assembly, agricultural systems, and heavy industrial machinery. Characterized primarily by their carbon content (typically ranging from 0.05% up to 2.0%), these steel sheets offer an outstanding balance of tensile strength, ductility, and weldability.
As a leading China Carbon Steel Sheet Manufacturer, we classify our carbon steel products into three main carbon thresholds: low carbon (mild steel, such as Q195 and Q235, containing 0.05% to 0.25% C), medium carbon (0.25% to 0.60% C, suitable for higher structural strength), and high carbon (above 0.60% C, typically utilized for high-wear applications, tool manufacturing, and specialized springs).
| Grade (Standard) | Carbon Content (%) | Yield Strength (MPa) | Tensile Strength (MPa) | Primary Global Application |
|---|---|---|---|---|
| Q195 (GB/T 700) | ≤ 0.12 | ≥ 195 | 315 - 430 | Furniture, light structural components, standard welded pipes |
| Q235 / Q235B (GB/T 700) | 0.14 - 0.22 | ≥ 235 | 370 - 500 | Heavy structural frames, transmission towers, galvanized pipes |
| ASTM A36 | ≤ 0.26 | ≥ 250 | 400 - 550 | General construction, bridge framing, automotive structures |
| S235JR (EN 10025) | ≤ 0.17 | ≥ 235 | 360 - 510 | European infrastructure, offshore platforms, scaffolding systems |
Selecting the appropriate chemical composition ensures that the finished plate or sheet matches specific mechanical performance parameters. For instance, Q235B exhibits highly balanced impact properties and toughness at standard temperatures, making it a reliable standard specification for industrial hollow sections and heavy plates globally.
Established in 1998, Tianjin Minjie Steel Co., Ltd. has spent over two decades developing high-tier processing capacity. Spanning a state-of-the-art facility of over 70,000 square meters, the plant operates just 40 kilometers from XinGang Port—the largest northern deepwater port in China. This strategic location facilitates immediate global shipping logistics.
Our structural and mechanical manufacturing assets include:
"Innovation in structural integrity is at the core of our operations. We have secured three core industrial patents to improve load bearing and fluid transmission operations: Groove Pipe technology, Shoulder Pipe connectors, and Victaulic Pipe joint structures."
Why international procurement departments rely on Tianjin's industrial metallurgy cluster for carbon steel sheets, coils, and tubes.
Tianjin's geographical location offers immediate raw material access. Our proximity to major state-owned blast furnaces and cold rolling mills allows us to source pristine hot-rolled steel coils (HRC) and cold-rolled steel coils (CRC) at highly stable wholesale pricing. This dynamic cost structure is passed directly to global buyers, mitigating market volatility.
Shipping heavy carbon steel sheet shipments requires deep structural coordination. Operating adjacent to Tianjin's XinGang port allows us to manage export custom clearance, port inspection, and heavy-cargo container loading under direct factory supervision. This logistics efficiency minimizes oxidation risks (white rust on galvanized sheets) and transit delays.
Operating across competitive global markets requires strict compliance with international manufacturing certifications. Tianjin Minjie Steel operates under the strict framework of the ISO 9001:2015 Quality Management System. Every batch of carbon steel sheets, coils, and tubes undergoes rigorous testing protocols to confirm tensile strengths, dimensional tolerances, and coating thickness parameters.
ISO 9001 Certificate
Quality Assurance
Mechanical Lab
Dimension Audit
Our products strictly conform to the following global code frameworks:
We participate in the annual Canton Fair, establishing strong supply networks with purchasing organizations from around the world. Over 80% of our prospective clients choose to visit our production facilities in Tianjin following product consultations.
Our export footprints span across various global markets:
Singapore (Sept 2019)
South Korea (2019)
Australia (Nov 2018)
India (2019)
Lebanon (June 2017)
Saudi Arabia (2018)
Providing engineered steel products for complex, high-demand industrial sectors.
Hot-dipped and PPGI coils ready for profiling into metal roofing, purlins, and wall panels.
Rust-inhibited piping for greenhouse structures, structural scaffolding, and water transmission.
Precisely formed square & rectangular hollow sections for machinery manufacturing and frames.
Hot-rolled structural angle irons for grid towers, structural reinforcement, and bracing.
Technical and logistics answers for purchasing managers and structural engineers.
Carbon is the primary hardening element in steel alloys. Increasing carbon content elevates yield strength, tensile strength, and hardness, but decreases ductility, weldability, and ease of machining. For instance, low carbon steel (e.g., Q195, Q235) is highly formable and easily weldable, making it suitable for structures and piping. Higher carbon concentrations are reserved for springs, high-strength wires, and wear plates where hardness is critical.
Pre-galvanizing involves passing continuous sheet steel through a zinc bath at the mill stage, resulting in a thin, uniform zinc coat (usually 40g/m² to 120g/m²) that is easy to form but has exposed cut edges. Hot-Dip Galvanizing (HDG) involves dipping fabricated steel parts or tubes into molten zinc, forming a thicker, comprehensive layer (often 300g/m² to 600g/m² or Z275+ specification) that covers all surfaces, edges, and welds, providing superior protection in corrosive environments.
Yes. Our factory processes custom sizing, slitting, bending, and punching for carbon steel sheets, coils, and hollow structural sections. We hold specific design patents for groove, shoulder, and victaulic connections, allowing us to deliver end-user-ready pipe fittings and structural members cut to precise project specifications.
We use export-grade packaging. Steel coils and sheets are wrapped in anti-corrosive waterproof paper, secured with heavy steel strapping, and packaged on pallets. For hollow profiles and pipes, we apply protective oil coatings or outer plastic caps. Being located 40km from XinGang Port ensures that transit exposure prior to vessel container loading is kept to a minimum.
Every shipment is issued with a Mill Test Certificate (MTC) conforming to EN 10204 Type 3.1. This certificate documents chemical ladle analysis, mechanical yield and tensile testing results, elongation ratios, and zinc coating weight testing. We also support independent third-party audits by SGS, Bureau Veritas, or Cotecna before dispatch.
Explore our specialized heavy-duty hollow sections, structural pipes, and custom construction steel products.
Q235 grade zinc coated GI steel tubing. Combines structural strength with a clean finish for furniture framing.
Heavy-duty scaffolding tubes and carbon steel connector pipes, meeting international safety codes.
Thick zinc layer hot-dipped Q235 steel pipes, designed for long-term outdoor construction framing.
Q195 cold-formed ERW square structural pipes, offering high dimension precision and consistent wall thickness.
Mild steel (MS) square tubes in Q235 structural steel grade, suitable for structural engineering frames.
Specialized galvanized steel tubes designed for modern greenhouse frame assemblies and agricultural projects.
Q235B water-grade threaded steel pipes with thick HDG coatings, protecting fluid channels against mineral buildup.
Heavy structural black welded pipe fabricated using hot-rolled ERW/SSAW techniques for utility applications.
Additional custom manufacturing runs matching global client drawings.
Engineered 50x150mm painted rectangular tubing, built to EN 10219 for structural frames.
Standard 2-3/8 inch Q235B low carbon scaffolding tubes, zinc-coated for weathering protection.
Hollow round pipe, optimized for fence piling, foundations, and agricultural supports.
Medium and light gauge pre-galvanized conduits manufactured in accordance with British Standards (BS 1387).
High yield ERW structural steel piping, coated with a protective zinc layer for durability.
Carbon steel welded construction tubing, featuring custom wall thickness variations for projects.
Large diameter spiral welded carbon steel pipes (SSAW) for municipal water and piling projects.
Direct mill pricing structure for batch-galvanized circular carbon steel pipes.
High yield strength Q345 non-alloy structural hollow tube, engineered for mechanical engineering loads.
Minjie Steel