74results about How to "Strong fracture resistance" patented technology

The invention provides a lifting hook protection device of a crane. The invention provides the lifting hook protection device of the crane, which can prolong the service life of a lifting hook and is safe and reliable. The lifting hook protection device of the crane comprises the lifting hook and a hook-sliding-proof buckle; the lifting hook is sleeved with the lifting hook protection device and the lifting hook protection device is movably connected with the lifting hook; the lifting hook protection device comprises an insulating layer, a fireproof layer and a wear-resisting layer; the lifting hook is sleeved with the insulating layer and the insulating layer is movably connected with the lifting hook; the insulating layer is sleeved with the fireproof layer and the fireproof layer is fixedly connected with the insulating layer; the fireproof layer is sleeved with the wear-resisting layer and the wear-resisting layer is fixedly connected with the fireproof layer; the lengths of the insulating layer, the fireproof layer and the wear-resisting layer are equal and are greater than a half of the length of the lifting hook. According to the lifting hook protection device of the crane, the lifting hook can be effectively and completely protected; the waste of materials is reduced and the cost of the lifting hook protection device is reduced.

The invention discloses a hot-rolled steel plate for an ocean riser with low cost and high performance and a production method thereof. The chemical components of the steel plate comprise C 0.04-0.10%, Si 0.10-0.35%, Mn 1.55-1.85%, Nb 0.02-0.08%, Ti 0.008-0.020%, Al 0.010-0.040%, P less than or equal to 0.020%, S less than or equal to 0.003%, Mo less than 0.20%, Cu less than or equal to 0.25%, Ni less than or equal to 0.30%, Cr less than or equal to 0.25%, N less than or equal to 0.008%, and the balance being Fe and unavoidable impurities, wherein Al / N is greater than or equal to 3, Ni+Cu+Mo+Cr is less than or equal to 0.70%, Nb+Ti is less than or equal to 0.09%, and Ti / N is equal to 2.5-5. CEIIW is 0.40-0.45%, CEPCM is 0.16-0.21%, casting blank heating temperature is 1,160-1,230 DEG C, four-stage heating is adopted, rough rolling temperature is 980-1,120 DEG C, fine rolling temperature is 790-900 DEG C, cooling temperature after rolling is 750-800 DEG C, cooling speed is 5-35 DEG C / s, and final cooling temperature is 430-520 DEG C. The steel plate of the invention has yield strength above 555 MPa, endwise tensile strength above 630 MPa, good cracking resistance, corrosion resistance and fatigue resistance, good comprehensive property, and low cost.