ALLLAND Steel Pipe Supply
Welcome to ALLLAND Steel Pipe Manufacturing. Our ASTM A500 Grade C structural steel tubing (HSS) is widely used in building structures, infrastructure, bridges, and the energy sector. ASTM A500 Grade C is a high-strength structural steel tubing that offers excellent weldability and formability. We are committed to providing safe, efficient, and competitive steel tubing solutions to customers worldwide, meeting the needs of your various engineering projects.
Alllandsteel is a steel pipe manufacturer based in China with 25 years of experience.
The facility spans 22,000 square meters, represents a RMB 700 million investment, and operates four production lines (JCOE, ERW, SMLS, SSAW) alongside five coating lines.
With an annual production capacity of 250,000 tons, the factory covers specifications ranging from Ø406 to Ø1524 and holds multiple international certifications (API/ASTM/EN/ISO/JIS). Focused on steel pipes, creating value for you!
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ASTM A500 is a standard established by the American Society for Testing and Materials (ASTM) for cold-formed welded and seamless hollow structural sections (HSS), including circular hollow sections (CHS), square hollow sections (SHS), and rectangular hollow sections (RHS).
ASTM A500 Grade C is the highest strength grade among these structural grades, and its primary applications involve load-bearing, framing, and structural stability in construction.
O.D.:
13.7mm – 2235mm
1/4″ – 88″
DN8 – DN400
W.T.:
1.65mm – 25.4mm
SCH 5S -SCH XXS
Length:
6-12 m, available in fixed or multiple lengths; custom lengths per project requirements.
Cross-Section Shapes:
CHS, Circular Hollow Section
SHS, Square Hollow Section
RHS, Rectangular Hollow Section
Manufacturing Process:
ERW, SMLS, SSAW, LSAW
Standards:
ASTM A500
ASTM A500 Grade C Steel Pipe Outside Dimensions
ASTM A500 specifies that for round tubes with an outer diameter ≤ 48.3 mm, the tolerance is ±0.5% (minimum ±0.13 mm); for outer diameters > 48.3 mm, the tolerance is ±0.75%.
For square and rectangular tubes, refer to the following:
| Specified Outside Large Flat Dimension, in. (mm) | Permissible Variations Over and Under Specified Outside Flat Dimensions,Ain.(mm) |
| 2½ [65] or under | 0.020[0.5] |
| Over 2½ to 3½ [65 to 90], incl | 0.025[0.6] |
| Over 3½to 5½[90 to 140], incl | 0.030[0.8] |
| Over 5½[140] | 0.01 times large flat dimension |
A The permissible variations include allowances for convexity and concavity. For rectangular tubing having a ratio of outside large to small flat dimension less than1.5, and for square tubing,the permissible variations in small flat dimension shall be identical to the permissible variations in large flat dimension. For rectangular tubing having a ratio of outside large to small flat dimension in the range of 1.5 to 3.0inclusive, the permissible variations in small flat dimension shall be 1.5 times the permissible variations in large flat dimension. For rectangular tubing having a ratio of outside large to small flat dimension greater than 3.0, the permissible variations in small flat dimension shall be 2.0 times the permissible variations in large flat dimension.
ASTM A500 Grade C Steel Pipe Wall Thickness: ASTM A500 specifies that no negative deviations are permitted for wall thickness; the actual thickness must be greater than or equal to the nominal thickness. The minimum wall thickness at any measurement point on the pipe must not be less than 10% of the specified wall thickness.
ASTM A500 Grade C Length: The tolerance for fixed-length pipes is typically ±6 mm; random lengths are subject to negotiation within the order range.
ASTM A500 Grade C Straightness: Maximum deviation ≤ L / 600
| CHS（Circular Hollow Section） | ||
| OD (mm) | WT (mm) | |
| 21.3 | 2.0 / 2.3 / 2.6 / 2.9 | |
| 26.9 | 2.0 – 3.2 | |
| 33.7 | 2.0 – 4.0 | |
| 42.4 | 2.0 – 4.5 | |
| 48.3 | 2.0 – 5.0 | |
| 60.3 | 2.3 – 6.0 | |
| 76.1 | 2.5 – 8.0 | |
| 88.9 | 3.0 – 8.0 | |
| 114.3 | 3.0 – 10.0 | |
| 139.7 | 3.5 – 12.0 | |
| 168.3 | 4.0 – 14.0 | |
| 219.1 | 4.5 – 16.0 | |
| 273.0 | 5.0 – 18.0 | |
| 323.9 | 6.0 – 20.0 | |
| 355.6 | 6.0 – 22.0 | |
| 406.4 | 6.0 – 25.0 | |
| 457.0 | 6.0 – 25.0 | |
| 508.0 | 6.0 – 25.0 | |
| 610.0 | 8.0 – 25.0 | |
| NPS | OD (inch) | WT (inch) |
| 1/2″ | 0.840 | 0.065 / 0.083 / 0.109 |
| 3/4″ | 1.050 | 0.065 – 0.113 |
| 1″ | 1.315 | 0.065 – 0.133 |
| 1-1/2″ | 1.900 | 0.083 – 0.145 |
| 2″ | 2.375 | 0.083 – 0.154 |
| 3″ | 3.500 | 0.120 – 0.216 |
| 4″ | 4.500 | 0.120 – 0.337 |
| 6″ | 6.625 | 0.134 – 0.432 |
| 8″ | 8.625 | 0.188 – 0.500 |
| 10″ | 10.750 | 0.250 – 0.500 |
| 12″ | 12.750 | 0.250 – 0.500 |
| SHS（Square Hollow Section） | |
| Size (mm) | WT (mm) |
| 20×20 | 1.5 – 3.0 |
| 25×25 | 1.5 – 3.5 |
| 30×30 | 1.5 – 4.0 |
| 40×40 | 1.5 – 5.0 |
| 50×50 | 2.0 – 6.0 |
| 60×60 | 2.0 – 6.0 |
| 75×75 | 2.5 – 8.0 |
| 100×100 | 3.0 – 10.0 |
| 120×120 | 3.0 – 12.0 |
| 150×150 | 4.0 – 14.0 |
| 200×200 | 5.0 – 16.0 |
| 250×250 | 6.0 – 20.0 |
| 300×300 | 6.0 – 25.0 |
| 400×400 | 8.0 – 25.0 |
| 500×500 | 10.0 – 25.0 |
| RHS（Rectangular Hollow Section） | |
| Size (mm) | WT (mm) |
| 40×20 | 1.5 – 3.0 |
| 50×30 | 1.5 – 4.0 |
| 60×40 | 1.5 – 5.0 |
| 80×40 | 2.0 – 6.0 |
| 100×50 | 2.0 – 8.0 |
| 120×60 | 2.5 – 10.0 |
| 150×100 | 3.0 – 12.0 |
| 200×100 | 4.0 – 14.0 |
| 250×150 | 5.0 – 16.0 |
| 300×200 | 6.0 – 20.0 |
| 400×200 | 6.0 – 25.0 |
| 500×300 | 8.0 – 25.0 |
| 600×400 | 10.0 – 25.0 |
ALLLAND Steel Pipe offers a comprehensive range of ASTM A500 Grade C steel pipes. Please feel free to DM.
Comparison Table with Other Grades of ASTM A500
| Element % | Grade A,B and D | Grade C | ||
| Heat Analysis | Product Analysis | Heat Analysis | Product Analysis | |
| Carbon, maxA | 0.26 | 0.30 | 0.23 | 0.27 |
| Manganese, maxA | 1.35 | 1.4 | 1.35 | 1.4 |
| Phosphorus, max | 0.035 | 0.045 | 0.035 | 0.045 |
| Sulfur, max | 0.035 | 0.045 | 0.035 | 0.045 |
| Copper, when copper steel is specified, minB | 0.20 | 0.18 | 0.20 | 0.18 |
A For each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage point above the specified maximum for manganese is permitted, up to a maximum of 1.50 % by heat analysis and 1.60 % by product analysis.
B If copper-containing steel is specified in the purchase order.
Grade A has the highest carbon content (≤0.30%), while Grades B and C have lower carbon content (≤0.26%). The lower the carbon content, the better the weldability. Grade C represents the optimal balance for welding.
Grade C has stricter limits on phosphorus and sulfur impurities compared to Grades A and B. Lower P/S levels result in better crack resistance, which is particularly important for projects with higher structural safety requirements.
| Round Structural Tubing | ||||
| Grade A | Grade B | Grade C | Grade D | |
| Tensile strength, min, ps (MPa) | 45 000 (310) | 58 000 (400) | 62 00 (427) | 58 000 (400) |
| Yield strength, min, psi (MPa) | 33 000 (228) | 42000 (290) | 46000 (317) | 36000 (250) |
| Elongation in 2 in. (50.8 mm), min, %A | 25A | 23B | 21C | 23B |
| Shaped Structural Tubing | ||||
| Grade A | Grade B | Grade C | Grade D | |
| Tensile strength, min, ps (MPa) | 45 000 (310) | 58 000 (400) | 62 00 (427) | 58 000 (400) |
| Yield strength, min, psi (MPa) | 39 000 (269) | 46 000 (317) | 50 000 (345) | 36 000 (250) |
| Elongation in 2 in. (50.8 mm), min, %A | 25A | 23B | 21C | 23B |
A Applies to specified wall thicknesses (t ) equal to or greater than 0.120 in. [3.05mm). For lighter specified wall thicknesses, the minimum elongation values shall be calculated by the formula: percent elongation in 2in. [50 mm] = 56t + 17.5, rounded to the nearest percent, For A500M use the following formula: 2.2t+17.5,rounded to the nearest percent.
B Applies to specified wall thicknesses (t) equal to or greater than 0.180 in. [4.57mm], For lighter specified wall thicknesses, the minimum elongation values shall be calculated by the formula: percent elongation in 2in. [50 mm] = 61t + 12, rounded to the nearest percent. For A500M use the following formula: 2.4t +12,rounded to the nearest percent.
C Applies to specified wall thicknesses (t) equal to or greater than 0.120 in. [3.05mm). For lighter specified wall thicknesses, the minimum elongation values shall be by agreement with the manufacturer.
D The minimum elongation values specified apply only to tests performed prior to shipment of the tubing.
Structural Steel Construction ⭐ Key Applications
Steel frames, columns, beams, trusses, etc.
Industrial Equipment & Machinery Frames
Machine Bases, Production Line Frames, Heavy Equipment Supports.
It is a hollow structural section (HSS) primarily used in building structures, industrial supports, infrastructure, and other fields; it is not intended for conveying fluids.
Grade B has a yield strength of ≥ 315 MPa, while Grade C has a yield strength of ≥ 345 MPa; Grade C has a higher strength.
Round tubes (CHS), square tubes (SHS), and rectangular tubes (RHS); it does not include elliptical or special-shaped tubes.
