| 摘要 |
A ram block for a blowout preventer which can be used successfully in a hydrogen embrittlement environment. The body of the ram block is made of an alloy having an upper hardness level of Rockwell 22 on the C scale (Rc 22), and is provided with an inner supporting edge of a soft, relatively stress-free, workhardenable alloy having an upper hardness level of about Rc22 which is capable of rapidly hardening on slight deformation at least about Rc 35 and upon engagement with and deformation by a tool joint and the load of the drill or other string of pipe forms a cutting and supporting edge of a hardness level sufficient to bite into the tool joint and support the heavy weight of the drill or other string of pipe. The relatively soft, work-hardenable alloy, may be deposited in place by welding and is soft enough to be readily machined to the desired shape. A number of embodiments and examples of the invention is disclosed. |
