AISI 4140是一种具备良好淬透性与高强度的低合金钢，广泛应用于石油天然气领域。通过调质热处理，该材料可在22~36 HRC硬度区间内实现多级强度调控，适用于高负载结构件与下井工具。 4140钢因其优良的机械性能和加工性能，在高强度结构件、下井工具、钻具 ...

Departamento de Engenharia Química, Escola Politécnica, Universidade de São Paulo (USP), Av. Prof. Luciano Gualberto, 380, São Paulo, São Paulo 05508-010, Brazil ...

As with the Model 20, Wilson Combat builds the new Model 20S around an CNC-machined and EDM-cut cylindrical action of 4140 steel, with a bolt that’s machined from 4340 barstock. The push-feed ...

Phase I—Determining the Current Status of the Brand The purpose of this phase is to understand the company and brand, including exploring key issues, opportunities, and challenges. The reason is to ...

This marked the completion of the structural steel phase, the next steps involve cladding the building, installing mechanical, plumbing, and electrical systems, and building out each section of the ...