ASTM A500 Grade A Structure Pipe Description
ASTM A500 is a standard developed by the American Society for Testing and Materials (ASTM) for cold-formed welded and seamless carbon steel structural tubing. Grade A (GRA) is a level within the ASTM A500 standard, specifying the minimum tensile strength, minimum yield strength, and other mechanical property requirements for structural tubing.
Applications:
In the construction industry, A500 GRA structural tubing is commonly used to construct building frames, supporting structures, roof trusses, etc.
In bridge construction, it can be used for piers, beams, and other structural components.
In the machinery manufacturing industry, this structural tubing can be used to manufacture machine frames, supporting structures, and other mechanical components.
ASTM A500 GR.A chemical composition,%
|
Material |
C, max |
P |
S |
Mn |
Cu |
|
A500 GR.A |
0.26 |
0.035 |
0.035 |
/ |
min |
ASTM A500 GR.A physical property:
|
Tensile strength, mn, ps (MPa) |
45 000(310) |
|
Yield strength, mn, psi (MPa) |
39 000(269) |
|
Elongation in 2 in. (50.8 mm), min, %A |
25 |
The production process of A500 GRA structural tubing mainly involves the following key steps:
Raw material preparation: Select qualified carbon steel materials and pre-treat them (e.g., removing surface defects, cutting to length) for subsequent forming.
Forming process: For welded tubing, curl steel plates/strips into shape and weld edges; for seamless tubing, produce tubing directly from billets via piercing rolling or extrusion.
Heat treatment: Treat the formed tubing to eliminate internal stresses, improve microstructure, and enhance mechanical properties.
Finishing and inspection: Finish the tubing (e.g., straightening, cutting, grinding) to meet dimensional and surface standards, and conduct thorough inspections and tests to ensure compliance with ASTM A500 Grade A requirements.
Test and inspection
Packaging and shipping
