High alloy steel
High-alloy steel is alloyed steel with alloying elements in the steel above 10%. The grade is crowned with the letter X, followed by a number indicating the average carbon content (in parts per million) and the symbol of the alloying element (arranged by content), and finally the average percentage value of the content of each major alloying element is indicated
Many types of alloy steel, usually divided into low alloy steel (content < 5%), medium alloy steel (content 5% to 10%), high alloy steel (content > 10%) according to the amount of alloying elements.
According to the quality is divided into high-quality alloy steel, special alloy steel; according to the characteristics and uses are divided into alloy structural steel, stainless steel, acid-resistant steel, wear-resistant steel, heat-resistant steel, alloy tool steel, rolling bearing steel, alloy spring steel and special performance steel (such as soft magnetic steel, permanent magnetic steel, non-magnetic steel), etc.
Organization and properties
1. Nickel and molybdenum content has a certain influence on the organizational transformation of low-carbon high-alloy steel used for lining plates. When the low-carbon high-alloy steel contains 1.0% Ni, 0.7% Mo, its annealing and quenching and tempering state organization are slate-martensite; when containing 1.0% Ni, 0.5% Mo and 0.8% Ni, 0.5% Mo, annealing organization for the ferrite and alloy carbide Cr7C3, Mo2C mechanical mixture, quenching and tempering organization is mainly slate-martensite.
2. With the reduction of nickel and molybdenum content, low-carbon high-alloy steel in the annealed state of the organization has changed, so that its hardness is reduced, but the impact toughness has been improved; after quenching and tempering, the organization are slate-martensite, hardness remains at about 50 HRC; corrosion resistance are slightly reduced, but still in a level, that is, the 7th level is still corrosion-resistant. When the other components remain unchanged, the molybdenum content is reduced to 0.5%, the impact toughness of the specimen is improved.
3. containing 0.8% Ni, 0.5% Mo low-carbon high-alloy steel to achieve the use of liner requirements, from the cost considerations, is more economical
Erosion
With the strong growth of power demand, the demand for high alloy steel for power station boiler tubes is increasing. High alloy steel is a kind of high alloy steel with high added value and excellent performance. High alloy steel accounts for only a small portion of the total production, and its refining is done in a general purpose ladle with magnesium carbon bricks for the slag line and carbon free ladle lining for the ladle wall and bottom. High alloy steel smelting process is complex, strict composition control requirements, longer refining time, accelerating the ladle slag line magnesium carbon brick damage.
1. high alloy steel smelting conditions high alloy slag on the ladle magnesium carbon brick erosion rate than CAS conventional slag more than twice as large.
2. higher refining temperature, longer refining time and lower slag roux is the main reason for the accelerated erosion of ladle magnesia carbon brick
Many types of alloy steel, usually divided into low alloy steel (content < 5%), medium alloy steel (content 5% to 10%), high alloy steel (content > 10%) according to the amount of alloying elements.
According to the quality is divided into high-quality alloy steel, special alloy steel; according to the characteristics and uses are divided into alloy structural steel, stainless steel, acid-resistant steel, wear-resistant steel, heat-resistant steel, alloy tool steel, rolling bearing steel, alloy spring steel and special performance steel (such as soft magnetic steel, permanent magnetic steel, non-magnetic steel), etc.
Organization and properties
1. Nickel and molybdenum content has a certain influence on the organizational transformation of low-carbon high-alloy steel used for lining plates. When the low-carbon high-alloy steel contains 1.0% Ni, 0.7% Mo, its annealing and quenching and tempering state organization are slate-martensite; when containing 1.0% Ni, 0.5% Mo and 0.8% Ni, 0.5% Mo, annealing organization for the ferrite and alloy carbide Cr7C3, Mo2C mechanical mixture, quenching and tempering organization is mainly slate-martensite.
2. With the reduction of nickel and molybdenum content, low-carbon high-alloy steel in the annealed state of the organization has changed, so that its hardness is reduced, but the impact toughness has been improved; after quenching and tempering, the organization are slate-martensite, hardness remains at about 50 HRC; corrosion resistance are slightly reduced, but still in a level, that is, the 7th level is still corrosion-resistant. When the other components remain unchanged, the molybdenum content is reduced to 0.5%, the impact toughness of the specimen is improved.
3. containing 0.8% Ni, 0.5% Mo low-carbon high-alloy steel to achieve the use of liner requirements, from the cost considerations, is more economical
Erosion
With the strong growth of power demand, the demand for high alloy steel for power station boiler tubes is increasing. High alloy steel is a kind of high alloy steel with high added value and excellent performance. High alloy steel accounts for only a small portion of the total production, and its refining is done in a general purpose ladle with magnesium carbon bricks for the slag line and carbon free ladle lining for the ladle wall and bottom. High alloy steel smelting process is complex, strict composition control requirements, longer refining time, accelerating the ladle slag line magnesium carbon brick damage.
1. high alloy steel smelting conditions high alloy slag on the ladle magnesium carbon brick erosion rate than CAS conventional slag more than twice as large.
2. higher refining temperature, longer refining time and lower slag roux is the main reason for the accelerated erosion of ladle magnesia carbon brick
Single crystal casting high temperature alloys
Casting high temperature alloys
Corrosion resistant high temperature alloys
Corrosion resistant alloys
Corrosion resistant stainless steel
Ni-Cr-Mo alloys
Ni-Cr-Mo-Cu alloys
Nickel-copper (Ni-Cu) alloy
Low alloy steel