Provided in the present application are a rare-earth microalloyed steel and a control process. The steel has a special microstructure, and the microstructure comprises a rare earth-rich nanocluster having a diameter of 1-50 nm. The nanocluster has the same crystal structure type as a matrix. The rare earth-rich nanocluster inhibits the segregation of the elements S, P and As on a grain boundary, and obviously improves the fatigue life of the steel. In addition, a rare-earth solid solution also directly affects a phase change dynamics process so that the diffusion-type phase change starting temperature in the steel changes at least to 2° C., and even changes to 40-60° C. in some kinds of steel, thereby greatly improving the mechanical properties thereof, and providing a foundation for the development of more kinds of high-performance steel.

A method for preparing a Bainite hot-working die, includes: 1) weighing and mixing alloy raw materials including: C: 0.50-0.60%, Si: 0.20-0.25%, Mn: 1.00-1.50%, W: 2.10-3.00%, Mo: 3.50-5.00%, V: 0.50-1.00%, Co: 0.60-1.10%, P≤0.02%, rare earth (RE): 0.01-0.10%, (RE)/(S)>3.0, (RE)×(S)<0.004%, the balance being Fe and impurities; smelting, casting, annealing the alloy raw materials, to yield steel billets; 2) forging the steel billets to obtain Bainite die billets; 3) mechanically roughening the Bainite die billets, to yield die inserts; 4) tempering the die inserts, to yield hardened Bainite die inserts through secondary strengthening of Bainite; 5) mechanically machining the hardened Bainite die inserts to yield precisely sized die inserts; 6) nitriding the precisely sized die inserts; and 7) assembling the die inserts to yield a Bainite hot-working die.

A method for preparing a Bainite hot-working die, includes: 1) weighing and mixing alloy raw materials including: C: 0.50-0.60%, Si: 0.20-0.25%, Mn: 1.00-1.50%, W: 2.10-3.00%, Mo: 3.50-5.00%, V: 0.50-1.00%, Co: 0.60-1.10%, P≤0.02%, rare earth (RE): 0.01-0.10%, (RE)/(S)>3.0, (RE)×(S)<0.004%, the balance being Fe and impurities; smelting, casting, annealing the alloy raw materials, to yield steel billets; 2) forging the steel billets to obtain Bainite die billets; 3) mechanically roughening the Bainite die billets, to yield die inserts; 4) tempering the die inserts, to yield hardened Bainite die inserts through secondary strengthening of Bainite; 5) mechanically machining the hardened Bainite die inserts to yield precisely sized die inserts; 6) nitriding the precisely sized die inserts; and 7) assembling the die inserts to yield a Bainite hot-working die.

The present disclosure belongs to the technical field of welding materials, and in particular relates to a Fe—Ni based alloy welding wire for welding 800H alloy and a preparation method thereof and a method for welding 800H alloy. The Fe—Ni based alloy welding wire for welding 800H alloy provided by the present disclosure has a reasonable chemical components, and after being used to weld 800H alloy, the obtained weld has a tensile strength of 557.6 MPa and an elongation of 37.5% at ambient temperature, and has a tensile strength of 420 MPa and an elongation of 17.25% at a temperature of 650° C.

The present disclosure belongs to the technical field of welding materials, and in particular relates to a Fe—Ni based alloy welding wire for welding 800H alloy and a preparation method thereof and a method for welding 800H alloy. The Fe—Ni based alloy welding wire for welding 800H alloy provided by the present disclosure has a reasonable chemical components, and after being used to weld 800H alloy, the obtained weld has a tensile strength of 557.6 MPa and an elongation of 37.5% at ambient temperature, and has a tensile strength of 420 MPa and an elongation of 17.25% at a temperature of 650° C.

The present invention relates to ferrous alloys with high strength, cost-effective corrosion resistance and cracking resistance for refinery service environments, such as amine service under sweet or sour environments. More specifically, the present invention pertains to a type of ferrous manganese alloyed steels for high strength and cracking resistance and methods of making and using the same for applications including, but not limited to, amine units used in oil and gas production, petroleum refining, and chemical production.

The present invention relates to ferrous alloys with high strength, cost-effective corrosion resistance and cracking resistance for refinery service environments, such as amine service under sweet or sour environments. More specifically, the present invention pertains to a type of ferrous manganese alloyed steels for high strength and cracking resistance and methods of making and using the same for applications including, but not limited to, amine units used in oil and gas production, petroleum refining, and chemical production.

The present invention relates to ferrous alloys with high strength, cost-effective corrosion resistance and cracking resistance for refinery service environments, such as amine service under sweet or sour environments. More specifically, the present invention pertains to a type of ferrous manganese alloyed steels for high strength and cracking resistance and methods of making and using the same.

The present invention relates to ferrous alloys with high strength, cost-effective corrosion resistance and cracking resistance for refinery service environments, such as amine service under sweet or sour environments. More specifically, the present invention pertains to a type of ferrous manganese alloyed steels for high strength and cracking resistance and methods of making and using the same.

A steel material is disclosed. The steel material includes components in the following mass percentages: 14% to 20% of nickel, 7.5% to 11% of cobalt, 4% to 7% of molybdenum, to 0.5% of rhenium and/or a rare earth element, less than or equal to 0.2% of manganese, less than or equal to 0.2% of silicon, less than or equal to 0.1% of carbon, less than or equal to of oxygen, iron, and inevitable impurities. The steel mechanical part is made of the steel material. The preparation method includes: mixing alloy powder and a binder to prepare feed particles; performing injection molding on the feed particles to obtain an injection green billet of the steel mechanical part; performing debinding and sintering on the injection green billet in sequence to obtain a sintered blank; and performing heat treatment on the sintered blank to obtain the steel mechanical part.