ASME SA516 Gr.70 Heat Exchanger Bottom Head
ASME SA516 Gr.70 is a carbon steel plate widely used in medium and low temperature pressure vessels, especially for manufacturing pressure-bearing parts such as heads of heat exchangers, storage tanks and boilers.
ASME SA516 Gr.70 heat exchanger bottom head is an ideal choice for medium and low temperature and non-strong corrosion conditions due to its high strength, good weldability and economy.
Heat exchanger bottom head:
When used as the bottom head of a shell and tube heat exchanger, it supports the tube bundle and distributes fluids (such as cooling water and oil products).
Such as the crude oil preheater of a refinery (temperature ≤300°C, sulfur-containing media need to increase the corrosion margin).
When used as the bottom head of a low-pressure storage tank (such as an LPG tank), liquid static pressure and seismic loads need to be considered.
ASTM A516 Grade 70 / ASME SA516 Grade 70 - Specifications and Standards
| Standard | Description |
| ASTM/ASME | A/SA516 - Grade 70 |
| DIN Standard | - |
| British Standard | BS1501-224-490A/B |
| European Norm | EN10028 P355GH |
ASTM A516 Grade 70 / ASME SA516 Grade 70 - Chemical Composition
| Composition | Percentage % | Composition | Percentage % |
| C | 0.10/ 0.22 | Cu | 0.3 |
| Si | 0.6 | Ni | 0.3 |
| Mn | 1/ 1.7 | Mo | 0.08 |
| P | 0.03 | Nb | 0.01 |
| S | 0.03 | Ti | 0.03 |
| Al | 0.02 | V | 0.02 |
| Cr | 0.3 | | |
Application of ASME SA516 Gr.70 Heat Exchanger Bottom Head
Shell and tube heat exchanger: as the bottom head of the heat exchanger, it supports the tube bundle and distributes the shell/tube media (such as cooling water, hydrocarbon fluid).
Refinery crude oil preheater: medium temperature ≤200°C, design pressure ≤3 MPa, and sulfur-containing crude oil needs to increase the corrosion margin (3~5 mm).
Hydrogenation reactor feed/discharge heat exchanger: withstand hydrogen environment, and require post-weld heat treatment (PWHT) to remove hydrogen.
Condenser and reboiler: liquefied natural gas (LNG) precooling: design temperature as low as -50°C, low-temperature impact toughness needs to be evaluated according to ASME UCS-66.
Waste heat boiler: gas turbine exhaust recovery: flue gas temperature ≤400°C, the head needs to withstand thermal cycle stress, and SA516 Gr.70 normalized plate is used.
Nuclear power plant auxiliary cooling system: non-radioactive fluid heat exchanger: design pressure ≤5 MPa, and must comply with ASME III grade container standards.
Chemical storage tanks: Liquefied petroleum gas (LPG) storage tanks: Design pressure 1.0~2.0 MPa, the head needs to pass the water pressure test (1.3 times the design pressure).
Food and pharmaceutical equipment: Aseptic heat exchanger: The inner surface is polished to Ra≤0.8 μm, in line with FDA hygiene standards.
