Hot Rolled 50X50mm Ms Steel Square Bar S235jr S355jr Mild Carbon Square Steel Bar for Construction
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Product Highlights
- EN standard hot rolled square bar with uniform grain, stable cutting, bending and full penetration welding performance.
- S235JR low yield grade with obvious cost advantage for light-duty brackets, decoration and simple mechanical parts.
- S355JR high strength grade reduces material thickness, fits heavy equipment bases, vehicle frames and load-bearing supports.
- Precise square dimension tolerance, flat four sides, convenient bolt assembly and post surface coating processing.
- Pass room temperature impact test at 20 Celsius degree, reliable for indoor and general atmospheric outdoor construction projects.
- Complete side width specifications, full MTC complying with EN 10025-2 for EU machinery and construction export orders.
Product Attributes
- After-sales Service
- 1 Year
- Warranty
- 1 Year
- Standard
- AISI, JIS, ASTM, DIN, BS, GB
- Model NO.
- S235JR, S355JR
- Certification
- ABS, RoHS
- Technique
- Hot Rolled
- Wall Thickness
- Thick
- Surface Treatment
- Coated
- Alloy
- Alloy
- Length
- 0.1-12000mm or as Customized
- Thickness
- 3-30mm
- Processing Service
- Cutting,Drilling,Polished,Coating
- Section Size
- 10-1000
- Material
- S235jr,S355jr,A36,A500,A588,Q355,Q235,S400
- Transport Package
- Standard Seaworthy Packages
- Specification
- 50*50
- Trademark
- Xinyuanxing
- Origin
- Wuxi
- HS Code
- 7305310000
- Production Capacity
- 50000ton Per Year
Product Images of Hot Rolled 50X50mm Ms Steel Square Bar S235jr S355jr Mild Carbon Square Steel Bar for Construction
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Hot Rolled 50X50mm Ms Steel Square Bar S235jr S355jr Mild Carbon Square Steel Bar for Construction -
Hot Rolled 50X50mm Ms Steel Square Bar S235jr S355jr Mild Carbon Square Steel Bar for Construction -
Hot Rolled 50X50mm Ms Steel Square Bar S235jr S355jr Mild Carbon Square Steel Bar for Construction -
Hot Rolled 50X50mm Ms Steel Square Bar S235jr S355jr Mild Carbon Square Steel Bar for Construction -
Hot Rolled 50X50mm Ms Steel Square Bar S235jr S355jr Mild Carbon Square Steel Bar for Construction -
Hot Rolled 50X50mm Ms Steel Square Bar S235jr S355jr Mild Carbon Square Steel Bar for Construction -
Hot Rolled 50X50mm Ms Steel Square Bar S235jr S355jr Mild Carbon Square Steel Bar for Construction
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Product Description
Hot Rolled 50x50mm Ms Steel Square Bar S235jr S355jr Mild Carbon Square Steel Bar for Construction Here is a comprehensive explanation of carbon square steel bar, a solid carbon steel profile with a square cross-section. It is a widely used basic steel product in industry and infrastructure.
Classification & Grade Standards
By carbon content
Low carbon steel (e.g., Q235/SS400/ST37-2/1018): C ≤ 0.25%, good weldability and ductility, cost-effective, suitable for structural parts.
Medium carbon steel (e.g., 45#/1045): C 0.25%-0.6%, high strength and hardness, usually heat-treated for shafts, gears and other mechanical parts.
High carbon steel (e.g., 65#): C > 0.6%, very high hardness, suitable for springs and tools.
By production process
Hot rolled: with oxide scale on surface, relatively large dimensional tolerance, low cost, general-purpose type.
Cold drawn / cold finished: smooth surface, high dimensional accuracy (tolerance ±0.1-0.3 mm), slightly higher strength, suitable for precision machining.
Execution standards:Chinese standard GB/T 702, GB/T 699;US standard ASTM A576, A108;European standard EN 10083;Japanese standard JIS G 4051.
Common Specifications
Side length: hot rolled normally 10×10 mm to 150×150 mm; cold drawn can be as small as 4×4 mm.
Length: usually fixed lengths of 6 m, 12 m; also cut to customer requirements.
Corner: square corner and rounded corner (R corner) available.
Properties & Applications
Key properties: low carbon steel is easy to weld and machine; medium carbon steel can be strengthened by heat treatment; better rigidity than round steel, easy for positioning and assembly.
Typical applications: building steel structures, machinery manufacturing (shafts, connecting rods, flanges), auto parts, guardrails, mold blanks, agricultural machinery, standard parts (bolts and nuts).
Key Points for Foreign Trade Procurement & Quality Inspection
Clarify standards and material certificates: require MTC (Material Test Certificate), spectral test report to avoid grade mismatch.
Dimensions and surface: agree on side length tolerance, straightness, R angle; specify surface roughness for cold drawn products.
Packaging: anti-rust oil + bundling is commonly used for sea transportation to prevent rust during delivery.
International grade conversion: Q235≈SS400≈ST37-2≈1018; 45#≈1045, convenient for matching customers from different countries.
Additional Notes
Distinguish between square steel (solid) and square hollow pipe / square tube (hollow); they have different quotations and HS codes.
Cold drawn square steel is more expensive than hot rolled, but reduces subsequent machining, suitable for precision parts projects.
| Grade | C | Si | Mn | P ≤ | S ≤ |
| Q235 | ≤0.12 | ≤0.30 | ≤0.50 | 0.045 | 0.050 |
| 45# | 0.42~0.50 | 0.17~0.37 | 0.50~0.80 | 0.040 | 0.040 |
| A36 | ≤0.25 | ≤0.30 | ≤1.00 | 0.040 | 0.050 |
| SS400 | ≤0.12 | ≤0.30 | ≤0.50 | 0.045 | 0.050 |
| 1045 | 0.42~0.50 | 0.17~0.37 | 0.60~0.90 | 0.040 | 0.040 |
Q235 & SS400 are very close in composition, both general structural low carbon steel.
45# is equivalent to 1045 medium carbon steel for machinery parts.