Fasteners, Stud Bolts, Studs, Bolting
NACE MR0175/ISO 15156 describes general principles and gives requirements and recommendations for the selection and qualification of metallic materials for service in equipment used in oil and gas production and in natural-gas sweetening plants in H2S-containing environments, where the failure of such equipment can pose a risk to the health and safety of the public and personnel or to the environment. It can be applied to help to avoid costly corrosion damage to the equipment itself. It supplements, but does not replace, the This part of NACE MR0175/ISO 15156 addresses all mechanisms of cracking that can be caused by H2S, including sulphide stress cracking, stress corrosion cracking, hydrogen-induced cracking and stepwise cracking, stress-oriented hydrogen-induced cracking, soft zone cracking, and galvanically induced hydrogen stress cracking.
All Bolting Material with maximum hardness 22 HRC is mentioned in the below table which can be used for nace applications
|ASTM A193/A193M||Grade B7M||-||-||G41400|
|Grade B8||CLASS 1||CLASS 1D||S30400|
|Grade B8CA||Class 1A||S34700|
|ASTM A320/A320M||Grade L7M||-||G41400|
|Grade B8||Class 1||S30400|
|Grade B8LN||Class 1B||S30453|
|ASTM A194/194M||Grade 2HM||-||-||-|
|ASTM A194/194M||Grade 7M||-||-||-|
|ASTM A194/194M||Grade 8A, 8CA, 8CLNA, 8MA, 8TA, 8FA, 8PA, 8NA, 8MNA, 8LNA, 8MLNA, 8MLCuNA, 8ML4CuNA, and 9CA||-||-||-|
Bolting that can be exposed directly to a sour environment, or that is buried, insulated, equipped with flange protectors or otherwise denied direct atmospheric exposure, shall conform to the general requirements of Carbon Steel & Low alloy Steels mentioned below
The behaviour of carbon and low-alloy steels in H2S-containing environments is affected by complex interactions of parameters, including the following:
All Bolting Material with maximum hardness 22 HRC is mentioned in the below table which can be used for nace applications.