What is the difference between SA 516 GR 70 and SA 537 CL 1?

The main differences between SA 516 GR 70 and SA 537 CL 1 are as follows:

Material Composition:

SA 516 GR 70: It is a carbon steel pressure vessel grade that primarily consists of carbon content with small amounts of manganese, phosphorus, sulfur, and silicon.

SA 537 CL 1: It is a heat-treated carbon-manganese-silicon steel pressure vessel plate. This grade has higher tensile strength compared to SA 516 GR 70.

Strength:

SA 516 GR 70: It has a lower ultimate tensile strength than SA 537 CL 1.

SA 537 CL 1: It has a higher tensile strength which makes it suitable for low temperature service where notch toughness is important.

Application:

SA 516 GR 70: Typically used for moderate and lower temperature pressure vessel applications.

SA 537 CL 1: Specifically designed for elevated temperature service in pressure vessel applications where excellent notch toughness is required at lower temperatures.

Impact Toughness:

SA 516 GR 70: Good impact resistance but not as high as SA 537 CL 1.

SA 537 CL 1: Specifically designed for applications requiring excellent notch toughness properties at low temperatures.

Cost:

SA 537 CL 1 is likely to be more expensive due to its specific characteristics and higher strength properties compared to SA 516 GR 70.

When choosing between SA 516 GR 70 and SA 537 CL 1, the operating conditions, design requirements, and material properties needed for the specific application should be considered.