Steel Square Bar
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Steel Square Bar Supplier in China
SKSTEEL is a professional Carbon Steel Square Bar supplier in China, providing a wide range of mild steel square bars for construction, fabrication, machinery, infrastructure and industrial projects. As a leading China steel square bar stockist, we maintain ready stock square bar in various sizes and grades for immediate shipment worldwide.
Steel Square Bar Production Standards/ Specifications/ Grades Available
| Standards | Grade |
|---|---|
| GB Standards | Q235B, Q355B |
| ASTM Standards | A36, A572 Grade 50, S304, S316 |
| JIS Standards | SS400, SM490 |
| EN Standards | S235JR, S275JR, S355JR |
| Standard | Grade | C% | Si% | Mn% | P% | S% | Cr% / Ni% | Other / Mechanical | Sample |
|---|---|---|---|---|---|---|---|---|---|
| EN 10025-2 | S355JR | <=0.24 | <=0.55 | <=1.60 | <=0.035 | <=0.035 | - | N<=0.012, Cu<=0.55 | Get Sample |
| JIS G3101 | SS400 | Not specified | Not specified | Not specified | <=0.050 | <=0.050 | - | - | Get Sample |
| GB/T 700 | Q235B | <=0.20 | <=0.35 | <=1.40 | <=0.045 | <=0.045 | - | - | Get Sample |
| ASTM A108/SAE J403 | 1045 | 0.43-0.50 | - | 0.60-0.90 | <=0.040 | <=0.050 | - | - | Get Sample |
| EN 10083-2 | C45 | 0.42-0.50 | <=0.40 | 0.50-0.80 | <=0.045 | <=0.045 | Cr<=0.40, Mo<=0.10 | - | Get Sample |
| JIS G4051 | S45C | 0.42-0.48 | 0.15-0.35 | 0.60-0.90 | <=0.030 | <=0.035 | - | - | Get Sample |
| ASTM A276/A479 | 304/UNS S30400 | <=0.08 | <=1.00 | <=2.00 | <=0.045 | <=0.030 | Cr 18.0-20.0, Ni 8.0-11.0 | - | Get Sample |
| ASTM A276/A479 | 316/UNS S31600 | <=0.08 | <=1.00 | <=2.00 | <=0.045 | <=0.030 | Cr 16.0-18.0, Ni 10.0-14.0 | Mo 2.0-3.0 | Get Sample |
| Standard | Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation % | Notes | Sample |
|---|---|---|---|---|---|---|
| ASTM A36/A36M | A36 | >=250 | 400-550 | >=20 | General structural square bars; check A36 bar requirements and size-specific clauses. | Get Sample |
| EN 10025-2 | S235JR | >=235 | 360-510 | >=26 | JR indicates 27 J impact energy at room temperature; values shown for common small thickness range. | Get Sample |
| EN 10025-2 | S355JR | >=355 | 470-630 | >=22 | Higher-strength structural square bar than S235JR; verify thickness band. | Get Sample |
| JIS G3101 | SS400 | >=245 | 400-510 | >=17 | JIS SS grades are mainly strength controlled; chemistry is less tightly listed than many EN/GB grades. | Get Sample |
| GB/T 700 | Q235B | >=235 | 370-500 | >=26 | Grade B commonly used for structural square bar; check deoxidation and impact requirements. | Get Sample |
| ASTM A108 / SAE J403 | 1045 | >=310 typical | 565-700 typical | >=16 typical | Mechanical properties vary strongly with bar size and heat treatment; good for shafts and machined parts. | Get Sample |
| EN 10083-2 | C45 | >=305 | 570-700 | >=16 typical | Used where higher strength and wear resistance are needed; not a direct structural substitute for S grades. | Get Sample |
| JIS G4051 | S45C | >=345 typical | >=570 typical | >=20 typical | Common square bar grade for machinery parts; properties depend on heat treatment. | Get Sample |
| ASTM A276/A479 | 304 / UNS S30400 | >=205 | >=515 | >=40 | Corrosion-resistant square bar; strength can increase by cold work. | Get Sample |
| ASTM A276/A479 | 316 / UNS S31600 | >=205 | >=515 | >=40 | Better chloride corrosion resistance than 304 due to molybdenum. | Get Sample |
| Size (mm) | Kg/M | Size (mm) | Kg/M |
|---|---|---|---|
| 5.5MM | 0.237 | 40MM | 12.6 |
| 6MM | 0.283 | 42MM | 13.8 |
| 6.5MM | 0.332 | 45MM | 15.9 |
| 7MM | 0.385 | 48MM | 18.1 |
| 8MM | 0.502 | 50MM | 19.6 |
| 9MM | 0.636 | 53MM | 22.0 |
| 10MM | 0.785 | 55MM | 23.7 |
| 11MM | 0.95 | 56MM | 24.6 |
| 12MM | 1.13 | 58MM | 26.4 |
| 13MM | 1.33 | 60MM | 28.3 |
| 14MM | 1.54 | 63MM | 31.2 |
| 15MM | 1.77 | 65MM | 33.2 |
| 16MM | 2.01 | 68MM | 36.3 |
| 17MM | 2.27 | 70MM | 38.5 |
| 18MM | 2.54 | 75MM | 44.2 |
| 19MM | 2.83 | 80MM | 50.2 |
| 20MM | 3.14 | 85MM | 56.7 |
| 21MM | 3.46 | 90MM | 63.6 |
| 22MM | 3.80 | 95MM | 70.8 |
| 23MM | 4.15 | 100MM | 78.5 |
| 24MM | 4.52 | 105MM | 86.5 |
| 25MM | 4.91 | 110MM | 95.0 |
| 26MM | 5.31 | 115MM | 104 |
| 27MM | 5.72 | 120MM | 113 |
| 28MM | 6.15 | 125MM | 123 |
| 29MM | 6.60 | 130MM | 133 |
| 30MM | 7.06 | 140MM | 154 |
| 31MM | 7.54 | 150MM | 177 |
| 32MM | 8.04 | 160MM | 201 |
| 33MM | 8.55 | 170MM | 227 |
| 34MM | 9.07 | 180MM | 254 |
| 35MM | 9.62 | 190MM | 283 |
| 36MM | 10.2 | 200MM | 314 |
| 38MM | 11.3 | - | - |
Applications
Steel Square Bar is widely used for steel structures, construction components, machinery parts, shafts, support bars, gates, railings, fences, frames, agricultural equipment, repair work, forging, machining and general industrial maintenance.
Challenges & Needs
When sourcing steel square bar, confirm dimensions, material grade, delivery condition, surface requirements, and inspection documentation before ordering.
Dimensional Tolerances
Specify side dimensions, length, straightness, and dimensional tolerances to match the intended machining or fabrication requirements.
Grade and Traceability
Confirm the steel grade, applicable product standard, delivery condition, and material certificate requirements. Keep grade identification and bundle markings consistent with the order.
Corrosion Decay
Agree the surface condition, rust protection, storage, and packaging requirements for the selected steel grade and shipping route. Inspect for surface damage before processing.
Carbon Steel Square Bar Export Packing and Loading
At SKSTEEL, all Steel Square Bars are packed in bundles according to international export standards with steel strips, wire rods or suitable straps to ensure safe transportation, efficient loading, and protection against damage during sea, rail, and truck transportation. The packing is suitable for container shipments, bulk vessel shipments, and project cargo deliveries worldwide. Especially for container shipment, SKSTEEL has considerable experience to load steel square bars into 20GP and 40HQ containers according to the specific sizes, bundle weight and customers’ requirements.
Steel Square Bar Supply Support from SKSTEEL
- Extensive Steel Square Bar Ready Stock for Fast Delivery
- Full Range of Sizes, Specifications and Grades
- Direct connections with leading steel square bar manufacturers
- 18 years of experience to ship steel square bar by 20GP, 40HQ container, and break bulk vessel
- Value-added processing services
- One-stop Structural Steel Supply
Steel Square Bar Order Requirements
Include processing, documentation, surface condition, and packing requirements in your square bar enquiry. Any additional services and delivery arrangements must be confirmed in the quotation.
Cut-Length Requirements
Provide the required bar length, cutting tolerance, and quantity per length. Confirm cutting availability and end condition before ordering.
Inspection and Documentation
State the required material certificates, dimensional checks, inspection scope, and traceability requirements with your enquiry.
Corrosion Protection
Specify the required surface condition and any rust protection or packaging needs. Confirm the available treatment and its compatibility with subsequent processing.
Logistics & Delivery
Collaboration with SKSTEEL
FAQ for Steel Supply Services
What is Steel Square Bar?
Steel Square Bar is a solid steel bar with equal side dimensions. It is widely used for fabrication, construction, machinery, frames, supports, railings and general industrial projects because it is easy to cut, weld, drill, machine and process.
What is the Steel Square Bar Bundle Weight normally from China mills?
Bundle weight depends on size, length and mill packing. For common stock square bars, bundle weight is usually arranged according to safe handling, container loading and customer requirements.
What is the standard length of Hot Rolled Steel Square Bar in China?
6meter
9meter
12meter
Can SKSTEEL provide cut-to-length Steel Square Bars?
Yes. We offer value-added processing services including:
Cutting
Drilling
Machining
Welding
Surface treatment
Painting Fabrication
Can 6meter or 12meter Steel Square Bar be loaded into 20ft Container or 40ft Container?
Yes, SKSTEEL can make shipment for 6meter steel square bar by 20ft Container and 12meter steel square bar by 40ft Container according to bundle weight, size range and loading plan.