Description: BBN steel is a well-known steel manufacturer and service provider in China, JIS G3101 SS400 Steel Plate, Coil, Profile, Bar & Pipe is our superior product, we are favored by customers with high quality, competitive price and excellent service
Payment Terms: L/C, T/T, D/P, Western Union, Paypal, Money Gram
JIS G3101 SS400 Carbon Structural Steel | Plate, Sheet, Coil, Bar, Pipe, Beam, Angle & Channel
The Most Mainstream General Carbon Structural Steel under JIS G3101 | Thickness 1.8–580mm | 400–510 MPa Tensile Strength | Plate, Sheet, Coil, Round & Flat Bar, Pipe, Angle, H Beam, Channel, I-beam & Profiled Forgings | Official MTC Provided
Stable Mechanical PropertiesGood ductility with excellent welding and processing performance — no strict limitations on carbon and manganese content.
Full Product FormsPlate, sheet, coil, round bar, flat bar, pipe, angle steel, H beam, channel steel and profiled forgings from one supplier.
Cost-Effective Mild SteelWidely recognized and adopted in construction, mechanical manufacturing, bridge engineering, shipbuilding and automotive structures.
01Product Overview & Specifications
SS400 is the most mainstream general carbon structural steel specified by the Japanese standard JIS G3101. It features stable mechanical properties, good ductility, excellent welding and processing performance, with no strict limitations on carbon and manganese content. This cost-effective mild steel is widely recognized and adopted in global construction, mechanical manufacturing, bridge engineering, shipbuilding and automotive structural projects.
The JIS G3101 standard covers a complete series of carbon structural steel grades, including SS330, SS400, SS490 and SS540. Among them, SS400 is the most versatile grade, suitable for both static conventional load-bearing structures and general secondary processing such as cutting, bending, welding and forming.
Item
Specification Details
Steel Grade
SS400 — general carbon structural steel
Executive Standard
JIS G3101 Japanese Standard
Thickness Range
1.8mm – 580mm full range available
Width Range
1000mm – 4000mm
Length Range
1000mm – 18000mmcustom sizes negotiable
Surface Condition
Hot rolled scaled finish, ground, rough/fine machining, customized surface treatment
100% full ultrasonic flaw detection or customized inspection standard
Product Types
Plate, Sheet, Pipe, Coil, Round Bar, Flat Bar, Angle Steel, H Beam, Channel Steel, Profiled Forgings
Stock Status
Adequate spot inventory available
MOQ
1 piece
Delivery Time
In stock: prompt delivery; custom production: 10–40 working days
Certification
Official MTC (Mill Test Certificate) provided
Payment Terms
T/T, Sight L/C
02Equivalent International Grades
SS400 has widely recognized equivalent grades in global standards, supporting material matching and cross-standard replacement for international engineering projects.
Standard System
Equivalent Grade
European EN Standard
S275JR
American ASTM Standard
A36
Chinese GB Standard
Q235B
Note: Equivalent grades match SS400 in general strength level and weldability, yet minor differences exist in chemical composition limits, specification details, tolerances and test requirements. For critical or long-cycle projects, please verify detailed project specifications before cross-standard replacement.
03Chemical Composition
JIS G3101 is a performance-led standard: phosphorus and sulfur are strictly limited, while carbon, silicon and manganese are not tightly restricted — the reason behind the excellent cost-performance of SS400.
Element
Content (Max, %)
C (Carbon)
Not specified in JIS G3101
Si (Silicon)
Not specified in JIS G3101
Mn (Manganese)
Not specified in JIS G3101
P (Phosphorus)
≤0.05
S (Sulfur)
≤0.05
Note: Unlike many carbon steel standards, JIS G3101 specifies maximum limits only for phosphorus and sulfur, leaving carbon, silicon and manganese unrestricted as long as the required mechanical properties are met. This is why SS400 delivers stable weldability and forming performance at a highly competitive cost. The actual heat analysis of each batch is stated in its Mill Test Certificate (MTC) supplied with delivery.
04Mechanical Properties
Upper yield strength, tensile strength, elongation and bend performance at room temperature per JIS G3101 — stable and reliable for general load-bearing structural service.
One supplier, the full SS400 product range — from plate and coil to sections, bars and pipe, with custom processing on every form.
1
SS400 Plate
Hot-rolled steel plate for structural frames, base plates and general load-bearing components.
2
SS400 Sheet
Thin-gauge hot-rolled sheet for general fabrication and secondary forming work.
3
SS400 Coil
Hot-rolled coil for subsequent slitting, cutting and profiling processing.
4
SS400 Round Bar
Solid round bar for shaft parts, connectors and mechanical machining.
5
SS400 Flat Bar
Flat bar for brackets, bracing members and welded sub-assemblies.
6
SS400 Pipe / Tube
Structural steel pipe for building frameworks and general mechanical structures.
7
SS400 Angle Steel
Equal & unequal angle for trusses, supports and connection members.
8
SS400 H Beam
Wide-flange H-beam for building main load-bearing structures.
9
SS400 Channel Steel
Channel section for purlins, support frames and mechanical bases.
10
SS400 I-beam
I-beam for building beams, support frames and overhead structures.
06Applications, Processing & Service
SS400 carbon structural steel is widely used for steel-structure buildings, workshop frameworks, bridge components, machinery bases, support brackets, guardrails, general welded parts and other common load-bearing structural projects.
Buildings & Steel Structures
Steel-structure buildings and workshop frameworks — main frames, columns and general load-bearing members.
Bridges & Infrastructure
Bridge components, support frames, platforms and overhead structural members.
Machinery & Equipment
Machinery bases, equipment frames, support brackets and general mechanical structures.
General Fabrication
Guardrails, stair stringers, welded parts and other common fabricated structural components.
1
Spot Inventory
Adequate stock of SS400 plates, coils and sections — prompt delivery for in-stock sizes.
2
Custom Production
Custom sizes and profiled forgings per drawings, completed within 10–40 working days.
3
Processing Service
Cutting, slitting, surface treatment and machining to ready-to-install condition.
4
Inspection & Certification
100% ultrasonic flaw detection, official MTC and third-party inspection supported.
Full-range SS400 plates, sheets, coils, bars, pipes and sections from adequate spot stock
Cutting, slitting, surface treatment and machining services available
100% ultrasonic flaw detection, official MTC and third-party inspection supported
Get Your JIS G3101 SS400 Steel Quotation Now
Send us your product form, dimensions (or part drawings), quantity and processing requirements. We will reply with stock status, competitive price, delivery time and complete certification documents within 24 hours.
BBN Steel has established a complete set of production and supplier management system processes to ensure the improvement of product quality and better service to users.
Production Control
BBN Steel has established a complete production quality control process to ensure every link from research and development to mass production.
Supplier management
Our supplier selection will consider factors such as health and safety, ethics, environmental protection, price and quality to better serve customers.
Certification & Patent
We have successively won various international authoritative certifications, GB /T19001-ISO9001: 2000 quality management system was implemented.
After sales service
We provide booking space, shipping tracking service and after-sales service, we will always be first-class products and perfect pre-sale and after-sales service.
Get in Touch
Welcome to contact us through online consulting, emails and hotline if you are interested in our company or products. Our staff will reply you within 24 hours.
Address: HIGH-TECH DEVELOPMENT ZONE, ZHENGZHOU, CHINA
