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The global structural infrastructure relies heavily on mild steel grades, with JIS G3101 SS400 remaining one of the most widely specified materials in industrial projects. Known for its balanced chemistry, high yield ratio, and exceptional weldability, SS400 is hot rolled to exact thicknesses to serve as the structural backbone for pipelines, heavy automotive fabrication, agricultural systems, and steel construction sections.
As a leading China SS400 Hot Rolled Steel Coil Manufacturer, we apply advanced temperature-controlled thermomechanical rolling processes. This refined metallurgy ensures stable mechanical performance across the entire length of the coil, reducing internal stresses and maintaining flatness tolerances that meet or exceed international standards like ASTM, DIN, and EN.
"SS400 carbon steel features an absolute yield strength minimum of 245 MPa for thicknesses under 16mm. Its predictability makes it the optimal choice for structural engineers seeking mechanical reliability, ductile behavior, and cost performance."
Unlike micro-alloyed or structural grades requiring complex chemical components, the performance of SS400 is achieved through precise carbon and manganese balancing. This optimizes the ferritic-pearlitic microstructure, ensuring high toughness even when subjected to ambient temperature fluctuations.
| Chemical Component | Maximum Percentage (%) | Mechanical Properties | Required Standard Metric |
|---|---|---|---|
| Carbon (C) | ≤ 0.25% | Tensile Strength | 400 - 510 MPa |
| Phosphorus (P) | ≤ 0.050% | Yield Strength (t ≤ 16mm) | ≥ 245 MPa |
| Sulfur (S) | ≤ 0.050% | Yield Strength (t > 16mm) | ≥ 235 MPa |
| Manganese (Mn) | Managed for grain structure | Elongation (Min %) | 17% - 21% (varies by gauge) |
To aid international design procurement processes, it is essential to map the JIS G3101 SS400 standard to regional counterparts:
Established in 1998, we have grown into a premier processing hub and manufacturer of structural steel, industrial pipe, and steel accessories.
Tianjin Minjie Steel Co., Ltd. was established in 1998. Our expansive factory covers more than 70,000 square meters, strategically situated just 40 kilometers from XinGang Port, which is the largest port in Northern China. This logistical proximity guarantees highly competitive transit costs and swift global delivery schedules.
As a professional manufacturer and exporter of steel products, our primary catalog includes pre-galvanized steel pipe, hot-dip galvanized pipe, welded steel pipe, square & rectangular tube, and scaffolding products. Over decades of targeted research and continuous development, we applied for and received 3 design patents: groove pipe, shoulder pipe, and victaulic pipe.
Our manufacturing capabilities are anchored by 4 pre-galvanized product lines, 8 ERW steel pipe product lines, and 3 hot-dipped galvanized process lines. We strictly manufacture in accordance with standards of GB, ASTM, DIN, and JIS. All our operational and manufacturing processes are certified under the ISO9001 quality management system.
Our annual output of various pipes exceeds 300,000 tons. We have earned honor certificates issued by the Tianjin municipal government and the Tianjin quality supervising bureau consistently. Our hot-rolled steel and fabricated structural profiles are widely applied to mechanical engineering, structural projects, agricultural vehicles, greenhouse construction, automotive assembly, railways, highway guardrails, internal shipping containers, furniture frame design, and steel fabrication.
Our organization maintains a top-tier professional technique advisory council in China alongside highly experienced staff equipped with specialized metallurgy training. Our reach extends globally, and we hope to build long-term, mutually beneficial cooperation with you.
Analyzing how different global regions deploy SS400 hot rolled coils into local industrial environments.
In developing municipal areas across Vietnam, Indonesia, and the Philippines, SS400 hot rolled steel coils are slit locally and roll-formed into essential components: structural C-channels, angle irons, and lightweight purlins. The grade's low cost combined with simple weld profiles supports rapid residential and light industrial construction without advanced on-site heat treatment.
For agricultural hubs, SS400 is slit and formed into ERW tubing, subsequently processed through continuous zinc-coating lines. The resulting structural greenhouse pipe balances rigidity against crosswinds and heavy snow loads with ductile properties that accommodate precision pipe bending during setup.
Automotive and trailer plants deploy pickled & oiled SS400 sheets to stamp internal chassis elements, dumper cargo beds, and transport brackets. High elongation allows complex press tooling deformation without localized micro-cracking, preserving component structural life under dynamic stress load cycles.
Discover how our manufacturing technology and logistics footprint optimize the acquisition cycle of carbon steel coils.
Operating 40 kilometers from XinGang Port enables us to ship materials efficiently during volatile maritime schedules. By loading directly into bulk vessels or heavy-payload containers under the supervision of our experienced loading crews, we mitigate rust damage from oceanic salt spray using protective polymer outer coatings. Our proximity to the port reduces overland shipping lag times to under 24 hours from final mill release.
We are continuously modernizing our production machinery. Our roadmap integrates precision thermo-mechanical controlled rolling (TMCP) to refine ferrite grain size. By stabilizing the finishing temperature, we minimize surface descaling requirements for downstream manufacturers, supporting lower overall fabrication carbon footprints.
Demonstrating our global market presence, technical inspections, and deep manufacturing transparency.
Certified factory operations
Intertek / SGS compliant verification
Technical consultation & onsite supply check
New structural product design partnership
Strategic scaffolding prop contract confirmation
10 Containers per month supply contract
1,000 Tons pipeline fabrication order
Structural building frameworks joint project
Our company participates in the Canton Fair every year. These exhibitions attract numerous global partners. Over 80% of our consulting clients coordinate subsequent quality inspections at our production facilities in Tianjin. We prioritize direct technical consultations to answer engineering questions, review chemical testing reports, and finalize custom tolerance parameters before initiating mill production.
Our fabrication lines generate complex profiles designed to meet specific engineering criteria. Here are our main product categories:
Steel Coils
Galvanized Pipes
Square Pipes
Angle Steels
Real-world delivery records showing precision machining and high-tolerance compliance across international projects.
Meets EN 10219 structural machinery specifications
2 3/8 inch Q235B low carbon structural piping
Optimized corrosion resistance for outdoor zones
Standardized water & structural conduit delivery
Tianjin metal building materials production run
High-diameter Q235B grade water delivery systems
Reliable commercial structural steel tubing
Q345 grade high-yield structural tubing
Review our factory-machined product configurations designed to perform in demanding industrial projects.
50x150mm EN 10219 compliant machinery tubes
Q235B low carbon scaffold structures
Hollow structural tubes for heavy steel fencing
Threaded and coupled options available
Custom ERW profiles for construction frameworks
Zinc protected conduit and framing runs
Large structural diameters at competitive rates
Engineered for high-strength application setups
Technical answers to common engineering, compliance, and purchasing questions from structural project directors.
JIS G3101 SS400 steel has a yield strength minimum of 245 MPa for thicknesses under 16mm, which adjusts to 235 MPa for thicknesses exceeding 16mm up to 40mm. The tensile strength ranges from 400 to 510 MPa, allowing it to perform under reliable structural loads without brittle fractures.
SS400 is specified under the Japanese JIS G3101 standard, whereas ASTM A36 is defined by the American Society for Testing and Materials. While their chemical limits differ slightly (A36 specifies strict limits on Carbon, Manganese, and Silicon, whereas SS400 mainly regulates Phosphorous and Sulfur), they are functionally comparable in general construction applications. You should verify your local code standards before substituting.
Yes. The chemistry of SS400 is highly compatible with hot-dip galvanization. The silicon content is managed to prevent the Sandelin effect, ensuring a uniform, clean protective zinc-iron alloy layer when processed in our advanced galvanizing lines.
Every shipment is accompanied by a certified Mill Test Certificate (MTC) conforming to EN 10204 3.1, detailing the chemical ladle analysis, mechanical tension tests, elongation percentages, and standard compliance.
Explore our secondary structural product list, designed for civil framing, conduits, and heavy scaffolding projects.
Minjie Steel