gwalkerb
Petroleum
- Jul 4, 2012
- 74
In this table, the first two materials listed are Soft Iron, with a maximum hardness of 90 Brinell or 56 Rockwell "B", and low-carbon steel, with a maximum hardness of 120 Brinell and 58 Rockwell "B".
However, Note 1 is referenced for the soft iron, and states 'May be low-carbon steel, not to exceed maximum hardness of 90 Brinell - 56 Rockwell "B" '.
I find this confusing. If I was specifying a low-carbon steel ring gasket, is the maximum Brinell hardness 90, or 120? If I specify a soft iron gasket with permission to substitute low-carbon steel, the maximum hardness is 90 Brinell, but if I specify only a low-carbon steel gasket, the hardness can be as high as 120 Brinell, if I'm reading this table correctly. It seems like there are two conflicting options for hardness for low-carbon steel for some reason.
Can anyone shed any light on this? Am I missing some key point here? For now I'll just go with the more conservative 90 Brinell for both materials.
However, Note 1 is referenced for the soft iron, and states 'May be low-carbon steel, not to exceed maximum hardness of 90 Brinell - 56 Rockwell "B" '.
I find this confusing. If I was specifying a low-carbon steel ring gasket, is the maximum Brinell hardness 90, or 120? If I specify a soft iron gasket with permission to substitute low-carbon steel, the maximum hardness is 90 Brinell, but if I specify only a low-carbon steel gasket, the hardness can be as high as 120 Brinell, if I'm reading this table correctly. It seems like there are two conflicting options for hardness for low-carbon steel for some reason.
Can anyone shed any light on this? Am I missing some key point here? For now I'll just go with the more conservative 90 Brinell for both materials.
