43results about How to "Avoid brittle cracking" patented technology

The invention relates to the technical field of railway equipment and discloses a diamond saw blade for a steel rail sawing machine. The diamond saw blade is prepared from, by weight, 15.5-20 parts ofdiamond, 10-15 parts of iron powder, 5-8 parts of chromium powder, 3-5 parts of silicon carbide powder, 4-6 parts of titanium powder, 6-8 parts of zinc powder, 30-33 parts of copper powder, 2-3 partsof aluminum powder and 8-12 parts of rare earth element. The invention further discloses a production process of the diamond saw blade for the steel rail sawing machine. The produced diamond saw blade for the steel rail sawing machine is high in hardness and less prone to damages in cutting of steel rails, and the service life is greatly prolonged. In addition, due to adoption of thin-wall sharpdiamond, cutting efficiency is effectively improved, stability and quickness in cutting are achieved, and cutting quality is guaranteed.

The application relates to a medium carbon non-quenched and tempered steel and a preparation process thereof, belonging to the technical field of iron and steel production. In this application, by limiting the content of Al, Nb and Ti, accurately controlling the content of V and N, and controlling the ratio of Σ(Al+Nb+V+Ti) / N to be between 6-9, a suitable content and dispersed precipitation are formed in the steel. The carbides and nitrides of Al, Nb, V, Ti, etc. can be refined, so that the brittle cracking of the steel can be reduced and the surface quality can be improved while ensuring the strength and toughness of the steel. The present application can reduce the internal stress of the medium carbon non-quenched and tempered steel and reduce the crack susceptibility through the precise control of the multi-process node process in the preparation process.

The invention discloses a high temperature resistant steam turbine blade. The chemical composition of the steam turbine blade is: C: 0.19-0.21%, Mn: 0.55-0.57%, Si: 0.20-0.22%, Al: 0.38-0.40%, V: 0.30‑0.32%, Ti: 0.40‑0.42%, Ni: 0.12‑0.14%, Sn: 0.06‑0.08%, Zr: 0.25‑0.27%, S≤0.025%, P≤0.025%, Cu≤0.20%, Lanthanide rare earth: 0.20‑0.22%, the balance is Fe; the present invention also designs the production process of changing the steam turbine blade, which is simple and low in cost, greatly improves the impact toughness of the blade, and improves the high temperature resistance of the blade , Nitriding surface treatment improves the service life of the blade.

The invention discloses a granite decorative board, which comprises a decorative board body, connecting grooves are arranged on both sides of the decorative board body, a vermiculite board is arranged near the connecting groove on the decorative board body, the vermiculite board is vertically installed on the decorative board body, and the vermiculite There are two stone slabs, a coating layer is connected between the two vermiculite slabs, and an insulation board is installed on the lower surface of the coating layer. The thickness of the insulation board is greater than the thickness of the coating layer. There is a foamed cement slab, and the foamed cement slab is flexibly connected to the main body of the decorative board, and a steel connecting column is installed between the foamed cement slab and the decorative board body, there are two steel connecting columns, and the top of the steel connecting column Extends within the insulation board. The granite decorative board is light in weight, easy to carry, has good fireproof performance, can avoid brittle cracking at the same time, and can effectively prevent the plate from arching and deformation, ensuring that the shrinkage joint gap of the plate is small, the overall is more reasonable, and the decorative effect is more obvious .