ASME SA709 Grade HPS70W is used to make riveted and bolted highway bridges and railway bridges (including sea-crossing bridges). ASME SA709 Grade HPS70W is widely used in engineering structures, such as building steel structures, construction machinery, mining machinery, trucks, bridges, pressure vessels, especially for building and engineering machinery components requiring better weldability and toughness.
ASME SA709 Grade HPS70W Chemical Composition
|
Grade |
Chemical composition % |
|
SA709 GR HPS70W |
C |
Si |
Mn |
P |
S |
Mo |
Ni |
Cr |
|
≤0.11 |
0.30-0.50 |
1.10-1.50 |
≤0.020 |
≤0.006 |
0.02-0.08 |
0.25-0.40 |
0.45-0.70 |
ASME SA709 Grade HPS70W Mechanical Property
|
Grade |
Mechanical Property |
|
SA709 GR HPS70W |
Tensile Strength(MPa) |
Yield Strength(MPa) |
Elongation in 2 in.
% |
|
585-760 |
≧485 |
≧19 |
ASME SA709 Grade HPS70W is exposed to low temperature or certain environmental medium for a long time, so ASME SA709 Grade HPS70W must have good low temperature toughness and weatherability. ASME SA709 Grade HPS70W should be tested before leaving the factory by tension test, cold bending test, impact test, aging impact test, fracture test, tensile test and so on. Before ASME SA709 Grade HPS70W is used in bridges, a series of weldability test, fatigue test, drop weight tear test, brittle transition temperature test and so on should be carried out to ensure the safety and reliability of the bridge. At present, in order to meet the above requirements in the use and properties of ASME SA709 Grade HPS70W, the mainly methods are microalloying, TMCP and heat treatment.
