Pressure vessel steel ASTM A516 grade 70 is a low carbon, fine grain steel suitable for low temperature service. Pressure vessel steel ASTM A516 grade 70 is easy to weld with SMAW and MIG.
The heat affected zone HAZ is roughly divided in three sections:
1. The section adjacent to the weld shows a dentritic microstructure made up of large pearlitic grains on a ferritic fund.
2. The section in the middle shows a ferritic and pearlitic assorted grains of similar size.
3. The section apart from the weld shows small ferritic and pearlitic grains on a fund of larger ferritic grains.
4. The base metal, not affected by heat, remains the same, i.e., assorted pearlite and ferrite grains.
Mechanical tests of pressure vessel steel ASTM A516 grade 70 usually include bending, tensile and impact tests.
