ASTM A500 Grade A (GR A) is a type of cold-formed welded and seamless carbon steel structural tubing with specified mechanical properties, including a minimum yield strength of 290 MPa and a minimum tensile strength of 400 MPa, and a standard for tubing used in bridges, buildings, and general structural purposes.
The "GRA" in the context of ASTM A500 refers to this specific grade, often seen on products like galvanized square and rectangular tubes.
We have a batch of high-quality square and rectangular tubes left in stock. These tubes are now available at very attractive prices.
Please find the details of the tubes below:
ASTM A500/A500M Gr.A square tube characteristics
ASTM A500 is a standard specification for coldformed welded and seamless carbon steel structural tubing in round, square and rectangular shapes. ASTM A500 is the most common specification in North America for Hollow Structural Sections (HSS).
ASTM A500/A500M Gr.A square tube physical data :
|
Density (lb / cu. in.) |
0.284 |
|
Specific Gravity |
7.9 |
|
Specific Heat (Btu/lb/Deg F - [32-212 Deg F]) |
0.107 |
|
Melting Point (Deg F) |
2750 |
|
Thermal Conductivity |
360 |
|
Mean Coeff Thermal Expansion |
6.7 |
|
Modulus of Elasticity Tension |
30 |
|
Modulus of Elasticity Torsion |
11 |
ASTM A500 Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes covers cold-formed welded and seamless carbon steel round, square, rectangular, or special shape structural tubing for welded, riveted, or bolted construction of bridges and buildings, and for general structural purposes. This tubing shall be produced in both welded and seamless sizes and must have the chemical requirements of carbon, manganese, phosphorus, sulfur, and copper. The steel shall be produced by either open-hearth, basic-oxygen, or electric-furnace melting process. When steels of different grades are sequentially strand cast, the steel producer shall identify the resultant transition material and remove it using an established procedure that positively separates the grades.
The tubing shall then be made by a seamless or welding process. Welded tubing shall be made from flat-rolled steel by the electric-resistance-welding process. The longitudinal butt joint of welded tubing shall be welded across its thickness in such a manner that the structural design strength of the tubing section is assured. Tension test and flattening test shall be conducted to the specimens. All tubing shall be inspected at the place of manufacture to ensure conformance to the requirements of this specification and must have a workmanlike finish that is free from defects.
ASTM A500 Steel Pipe Properties-Grade A,B,C,D
ASTM A500 has four steel grades A,B,C,D. Different steel grades correspond to different tensile and yield strengths, and carbon content is also different.
ASTM A500 grade A steel has a tensile strength of 400MPa and a yield strength of 290MPa.
Grade B steel has a tensile strength and yield strength of 400MPa and 310MPa respectively.
Grade C steel has a tensile strength and yield strength of 400MPa and 260MPa respectively.
Grade D steel has a tensile strength and yield strength of 400 MPa and 230 MPa respectively.
It can be seen that the tensile strength of ASTM A500 is the same, and the yield strength of grade B steel is the largest, followed by A500 Gr A/C/D.
These mechanical properties, carefully defined, ensure that the tubing will maintain its structural integrity under demanding
Chemical Requirements of ASTM A500 Grade A, A500 Grade B, A500 Grade D, and A500 Grade C
| Composition, % | ||||
|---|---|---|---|---|
| Element | Grades A, B and D | Grace C | ||
| Heat Analysis |
Product Analysis |
Heat Analysis |
Product Analysis |
|
| Carbon, max | 0.26 | 0.30 | 0.23 | 0.27 |
| Manganese, max | ... | ... | 1.35 | 1.40 |
| 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, min |
0.20 | 0.18 | 0.20 | 0.18 |
A500 Steel Mechanical Properties
Tensile strength refers to the amount of stretching stress a material can withstand before breaking or failing. The ultimate tensile strength of A500 steel is calculated by dividing the area of the steel by the stress placed on it, which is expressed in terms of pounds or tons per square inch of material. Tensile strength is an important measure of A500's ability to perform in an application. A500 carbon steel's tensile strength is described in the chart below.
Tensile Requirements of ASTM A500 Steel Grades
| Round Structural Tubing | ||||
|---|---|---|---|---|
| Grade A | Grade B | Grade C | Grade D | |
| Tensile strength, mn, ps (MPa) | 45 000 (310) |
58 000 (400) |
62 00 (427) |
58 000 (400) |
| Yield strength, mn, psi (MPa) | 33 000 (228) |
42 000 (290) |
46 000 (317) |
36 000 (250) |
| Elongation in 2 in. (50.8 mm), min, %A | 25B | 23C | 21D | 23C |
| Shaped Structural Tubing | ||||
|---|---|---|---|---|
| Grade A | Grade B | Grade C | Grade D | |
| Tensile strength, mn, ps (MPa) | 45 000 (310) |
58 000 (400) |
62 00 (427) |
58 000 (400) |
| Yield strength, mn, psi (MPa) | 39 000 (269) |
46 000 (317) |
50 000 (345) |
36 000 (250) |
| Elongation in 2 in. (50.8 mm), min, %A | 25B | 23C | 21D | 23C |
A500 Steel Pipe Application Scenarios
A500 Construction
ASTM A500 Structural Tubing is widely used in construction to build all types of building structures. Its high strength and durability make it ideal for supporting stairs, frames and floor structures.
Bridge Construction
Bridge structures have extremely high requirements for durability and load capacity, and ASTM A500 structural tubes excel in this area.
Used in the manufacture of major bridge components such as cross and longitudinal girders, the high strength of ASTM A500 tube ensures reliable operation of bridges in a variety of environmental conditions.e
Communication Towers and Support Structures
Communication towers and support structures require strong materials that can withstand wind and heavy loads, and ASTM A500 structural tubing plays a key role in these demanding applications, ensuring that communication equipment is securely supported while meeting stringent requirements for structural strength and stability.