SS400 Steel Plate

As a professional Steel Plate manufacture, you can rest assured to buy Steel Plate from our factory and Sanhe Steel will offer you the best after-sale service and timely delivery.

SS400 Steel Plate is hot rolled mild carbon structural steel defined under Japanese Industrial Standard JIS G3101, where “SS” means structural steel and “400” stands for minimum 400MPa tensile strength. As a reliable universal structural steel, our SS400 steel plate produced by Sanhe Steel strictly controls impurity elements S≤0.050% and P≤0.050%, low carbon content brings outstanding ductility, cold forming performance and weldability without complicated preheating before welding work.

All SS400 steel plates from Sanhe Steel adopt continuous casting and controlled temperature rolling production line, uniform internal grain structure, less internal porosity and lamination defects. Surface condition can be raw hot rolled black skin, shot blasting cleaned or primer coated as customer demand. Our factory supports secondary processing service including laser cutting, plasma cutting, bending, slitting and drilling to match different fabrication requirements. Compared with ordinary low carbon steel, Sanhe manufactured steel plate maintains consistent mechanical property batch by batch, stable load-bearing capacity under static and mild dynamic loads, long service life for general construction and machinery manufacturing projects.

Specification Parameters

1 Chemical Composition (JIS G3101 Standard, wt%)

2 Mechanical Property

3 Available Size Range (Sanhe Steel Stock & Custom)

Main Applications

SS400 Steel Plate owns balanced strength and excellent processability, widely adopted across global construction, machinery, transportation and infrastructure industries:

1. Building Steel Structure: Factory workshop frames, building beams, columns, floor support plates, steel trusses, stair brackets

2. Bridge & Municipal Engineering: Bridge secondary structural parts, road guardrail base, tunnel support components, municipal platform boards

3. General Machinery Manufacturing: Machine tool base, equipment support frame, heavy machinery shell, bearing support plate, pump base

4. Transportation Industry: Truck chassis auxiliary parts, container non-pressure structural components, ship deck secondary brackets

5. Civil Fabrication: Metal brackets, storage rack base, outdoor equipment housings, small pressure vessel shells

6. Engineering Outsourcing Fabrication: Welded structural parts for Japanese, Korean and Southeast Asian engineering projects (perfect match JIS local acceptance standard)

Product Grade Comparison: SS400 VS ASTM A36 VS Q235B

Clear comparison helps buyers select proper material and avoid wrong grade replacement risk, increase procurement trust:

Core takeaway: For Japanese-funded factories, Southeast Asian projects following JIS standard, Sanhe SS400 steel plate is the only matching grade; Q235 cannot substitute SS400 in official JIS inspection acceptance.

Why Choose Sanhe Steel ？

Sanhe Steel is a professional integrated SS400 steel plate manufacturer with 18 years export experience, we control whole supply chain from raw steel billet rolling to finished plate processing and export shipment, our core advantages solve buyers’ common pain points:

1. Complete Factory Self-Production & Mass Stock

We own independent hot rolling production line and 30,000㎡ stock yard, full thickness SS400 steel plate in stock, MOQ flexible from 1 ton small trial order to 5000 tons bulk project order, fast delivery within 3–7 working days without third-party middleman markup.

2. Strict JIS Standard Quality Inspection

Every batch steel plate completes chemical composition test, tensile test and impact test before delivery, official Mill Test Certificate (MTC) attached with furnace batch number, thickness tolerance strictly controlled within ±0.3mm, reject material thickness shrinkage cutting corners phenomenon that many small suppliers exist. We support third-party SGS/BV inspection before loading container.

3. One-Stop Custom Processing Service

In-house cutting, bending, drilling, shot blasting and primer coating workshop, according to customer CAD drawing precise custom size, reduce secondary processing cost for overseas fabricators; export standard seaworthy packaging with steel strip bundling + waterproof plastic film to prevent rust during sea transportation.

4. Stable Export Supply Chain & Flexible Payment

Long-term cooperation with major shipping lines, fixed container loading team, accurate loading weight to avoid weight difference loss; accept T/T, L/C at sight common international payment terms, professional foreign trade team with Japanese/English bilingual sales to communicate technical parameters smoothly for Asian buyers.

5. Long-Term After-Sales Technical Support

Our metallurgical engineer team provides material selection suggestion, welding parameter guide and substitute material consultation free of charge. If any quality problem caused by our production, we bear all return shipping and replacement cost without complicated dispute procedures, thousands of repeated cooperative factory clients in Japan, Vietnam, Thailand, Malaysia prove our stable credibility.

FAQ

Q1: Can Q235B steel replace SS400 steel plate for Japanese engineering projects?

A1: Not recommended and most Japanese contractors will reject inspection. SS400 follows JIS G3101 special impurity control standard, Q235 belongs to Chinese national standard with lower yield strength and loose element limits, inconsistent test report cannot pass JIS site acceptance. Sanhe Steel only provides genuine JIS standard SS400 plate to avoid project rework loss.

Q2: What’s the delivery time for custom cut SS400 steel plate?

A2: Conventional standard size in stock: 7-15 days delivery; custom cutting, shot blasting or primer coated order: 15-35 working days; mass bulk order above 1000 tons: negotiate fixed delivery schedule to match project construction timeline.

Q3: Is SS400 steel plate anti-rust without surface coating?

A3: Raw hot rolled SS400 plate has natural oxidation black skin, not anti-corrosion for long-term outdoor humid environment. We provide shot blasting + gray anti-rust primer treatment as optional service for marine, coastal outdoor application to extend service life.

Q4: What’s the minimum order quantity of Sanhe SS400 steel plate?

A4: No strict high MOQ limit. We accept 1 ton small trial order for new clients, small batch orders share same factory production standard and full quality test report as bulk orders, help buyers test market without huge capital pressure.

Q5: Does Sanhe Steel support door-to-door delivery or FOB port shipment?

A5: Two trade terms available: FOB Tianjin/Qingdao major seaport (most cost-saving for bulk export), and door-to-door delivery to overseas warehouse with full logistics coordination service for clients without local freight agent.

Client Case Studies

Leveraging product quality that strictly adheres to JIS G3101 standards and comprehensive export services, Sanhe Steel has long supplied SS400 steel plates to various countries and regions across Asia. We have established deep partnerships with engineering firms, machinery manufacturers, and foreign trade contractors, accumulating a wealth of successful project case studies.

Partnerships with Japanese Manufacturers

For eight consecutive years, we have supplied SS400 hot-rolled steel plates to numerous small and medium-sized Japanese machining and equipment assembly plants. Our products are primarily used for components such as machine tool bases and general machinery frames. Every batch successfully passes local quality inspections, with complete material reports and heat/batch number documentation; our partnerships remain stable, with annual supply volumes reaching thousands of tons.

Infrastructure Projects in South Korea

We have supplied materials for municipal infrastructure and factory steel structure projects in cities such as Seoul and Busan. The plates are used in applications including factory columns, platform support plates, and guardrail bases. To address the local humid maritime climate, we provide customized surface treatments—such as sandblasting and anti-rust primer application—to effectively extend the outdoor service life of the steel, resulting in repeat orders from project clients.

General Contracting Projects in Southeast Asia

We supply SS400 steel plates—in both standard sizes and custom-cut dimensions—for engineering projects funded by Japanese and South Korean companies in Southeast Asia (including Vietnam, Thailand, and Malaysia). These projects utilize JIS acceptance standards; our products fully meet all requirements regarding chemical composition and mechanical properties. Leveraging logistical advantages from nearby ports, we ensure the timely delivery of large-volume orders for applications ranging from architectural steel structures and container components to warehouse shelving.

Domestic Manufacturers Exporting to Japan

We supply raw materials to dozens of domestic enterprises specializing in hardware, sheet metal, and steel structures for export. After undergoing secondary processing—such as bending, welding, and drilling—the finished products are exported entirely to the Japanese market. Thanks to consistent batch performance and precise dimensional tolerances, we help our partners successfully pass inspections by their overseas clients, establishing ourselves as their reliable, long-term raw material supplier.