ALLLAND Boiler Steel Pipe Supply
ASTM A500 Grade B
Welcome to ALLLAND Steel Pipe Manufacturing. ALLLAND STEEL PIPE offers steel pipes that comply with ASTM A500. Our Grade B steel pipes are widely used in construction and structural engineering, infrastructure development, industrial equipment and machinery, as well as agricultural and greenhouse structures. Our quality meets military-grade standards, ensuring the success of your projects.
- O.D. 33.4-323.8mm
- W.T. 1.65-19.05mm
- Length 1.5-18m
- Standards: ASTM A500
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 Grade B is a common standard for structural carbon steel pipes, frequently used in support structures for construction and engineering projects.
ASTM A500 is a standard specification for cold-formed, welded, and seamless structural carbon steel pipes, classified into four grades—A, B, C, and D—based on yield strength.
Grade B is one of the grades within the ASTM A500 specification.
ASTM A500 Grade B Specification
O.D.:
1.315 “-12.75 “
33.4 mm-323.8 mm
W.T.:
0.065 ‘’-0.750 ‘’
1.65 mm-19.05 mm
Length:
1.5 – 18 m, available in fixed or multiple lengths;custom lengths per project requirements.
Surface:
Varnishing, Black, Oiling, Hot Dip Galvanizing
Procedure:
ERW,SMLS,SSAW,LSAW
Standards:
ASTM 500
Steel Grades:
Grade B
End Type:
Square cut, Bevelled, Threaded, Grooved
A500 Grade B is the most versatile and cost-effective structural steel pipe in ASTM standard.
ALLLAND’s ASTM A500 Grade B steel pipes comply with ASTM international standards and certifications. Available in a comprehensive range of specifications, they are widely used in load-bearing components for building structures, mechanical frameworks, curtain walls, and steel structure projects.
ASTM A500 Grade B Pipe Dimensional Tolerances (Typical)
Outer Diameter Tolerance
| Outer Diameter Range (inches) | Tolerance ±（inch） | Tolerance ±（mm） |
| ≤ 3½ | 1/32 | 0.8 |
| > 3½ – 4½ | 3/64 | 1.2 |
| > 4½ – 6 | 1/16 | 1.6 |
| > 6 – 8 | 3/32 | 2.4 |
| > 8 – 10 | 1/8 | 3.2 |
| > 10 – 12 | 3/16 | 4.8 |
| > 12 – 14 | 1/4 | 6.4 |
Wall Thickness Tolerance
| Wall Thickness Range（inch） | Tolerance ±（inch） | Note |
| ≤ 0.188 | 12.5% | Deviations in thin wall thickness are calculated as a percentage. |
| 0.188 – 0.25 | 0.015 | Absolute value can be used. |
| 0.25 – 0.375 | 0.020 | Same as above. |
| 0.375 – 0.5 | 0.025 | Same as above. |
| > 0.5 | 5% | Take the larger value. |
The tolerances vary depending on the wall thickness range, and the wall thickness in the weld area can deviate slightly from the base material thickness.
The standard only controls the effective structural wall thickness. For square and rectangular tubes, the wall thickness is measured at the center of the flat side, excluding the corners.
Length Tolerance (Cut Length)
The standard length of steel pipes is typically 6 meters, with a permissible length tolerance of ±1/8 ‘’ (~3 mm).
Straightness Tolerances
ASTM 500 specifies that the camber should be ≤ 0.5% of the pipe length.
Weight Tolerance per foot
Chemical Composition of Grade B Steel Tubes
Grade B has a carbon content of ≤0.26%, making it a low-carbon steel.
It offers good weldability and can be directly subjected to secondary processing such as welding, drilling, cutting, bending, and painting.
| Composition, % | ASTM A500 Grade B | |
| Heat Analysis | Product Analysis | |
| Carbon, max | 0.26 | 0.3 |
| Manganese, max | 1.35 | 1.4 |
| Phosphorus, max | 0.035 | 0.045 |
| Sulfur, max | 0.035 | 0.045 |
| Copper, min | 0.2 | 0.18 |
In the ASTM 500 standard, grades B and D have the same chemical composition requirements. Their tensile strength and elongation are also identical; the main difference is that grade D has a higher yield strength.
Mechanical Properties of Grade B Steel Tubes
Grade B has a yield strength of ≥315 MPa; it offers moderate strength and good toughness, making it suitable for most structural load requirements.
| Grade | ASTM A500 Grade B |
| Tensile strength, min | 58000 psi [400 MPa] |
| Yield strength, min | 46000 psi [315 MPa] |
| Elongation in 2 in. (50 mm), min, % | 23 |
ASTM A500 Grade B must also undergo tensile, flattening, and bending tests to verify that the steel pipe meets the requirements for yield strength, tensile strength, and elongation.
Depending on specific conditions, ASTM A500 Grade B may also undergo hardness testing.
A500 Grade B vs A500 Grade C
| Grade B | Grade C | |
| Yield strength | 46 ksi (315 MPa) | 50 ksi (345 MPa) |
| Tensile strength | 58 ksi min | 62 ksi min |
| Cost | Lower | Slightly higher |
| Frequency of use | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ |
Grade C can be considered a strength upgrade of Grade B, and is generally used in high-load structures. Grade C is also more expensive than Grade B because it has stricter requirements for composition control and strength.
For ordinary structures, Grade B is more economical.
Equivalent standards to ASTM A500
Standards from different countries/regions are not absolutely interchangeable; the most applicable standard should be determined based on the actual working conditions.
- GB/T 6728
- EN 10219-1 & EN 10219-2
- ISO 10799
- JIS G 3466
ASTM A500 Grade B Steel Pipe Supplier
ALLLAND STEEL PIPE provides ASTM A500 Grade B structural cold-formed welded steel pipes with international certification and a full range of specifications.
Our factory has mature steel pipe production lines and anti-corrosion coating production lines, controlling the entire process from raw materials to finished product corrosion protection.
With 25 years of experience as a professional steel pipe supplier, we welcome your inquiries. Our expert team is here to tailor a steel pipe procurement solution for you.
FAQ
What is ASTM A500 Grade B?
ASTM A500 Grade B is a standard for cold-formed carbon steel tubes intended for structural use and is one of the most commonly used structural tubing grades.
Tube types include square tubes, rectangular tubes, and round tubes.
What are the mechanical properties of ASTM A500 Grade B?
Yield Strength: ≥ 46 ksi (315 MPa); Tensile Strength: ≥ 58 ksi (400 MPa+), suitable for most structural engineering requirements.
What are the main applications of ASTM A500 Grade B?
Grade B is widely used in load-bearing structures, such as building steel structures, bridges and infrastructure, machinery, and support frames.
