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Multi-element composite strengthened alloy semisteel sizing/reducing machine roller and preparation method thereof

A strengthening alloy and multi-component compounding technology, applied in the field of casting roll manufacturing, can solve problems such as failure of easy-sticking steel, affecting the surface quality of steel pipes, and high alloy content

Inactive Publication Date: 2020-10-23
山东四方工模具材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing defects and deficiencies are poor wear resistance, large consumption of rolls, matrix structure is bainite or pearlite, and the hardness of the matrix is ​​lower at high temperature, especially when rolling high-grade steel and alloy steel pipes, it is easy to stick to steel and fail ;The tensile strength is only 300~400MPa, and the impact toughness is only 2.2~3J / cm 2 , easy to crack and fail in the later stage of use, poor wear resistance and corrosion resistance, under the alternating action of high temperature and cooling water, the surface of the roll is prone to galvanic reaction, which is manifested as rough surface of the roll after use, easy to form "tiger spots", which seriously affects the steel pipe surface quality
The high nickel-molybdenum alloy ductile iron steel has a high alloy content, especially the high content of precious metals such as nickel and molybdenum, which increases the production cost
[0006] In addition, steel pipe fixed / reducing rolls are special-shaped rolls, and half of their cross-section is approximately "M"-shaped. Conventional casting is difficult. At present, centrifugal casting is mostly used to form cylinders with inner holes for processing. Therefore, the material utilization rate is relatively low. Low

Method used

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  • Multi-element composite strengthened alloy semisteel sizing/reducing machine roller and preparation method thereof
  • Multi-element composite strengthened alloy semisteel sizing/reducing machine roller and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] refer to figure 1 The schematic diagram of the roll structure, half of its section is approximately "M" shape. Example 1 is to manufacture 6 pieces of three-roller hot-rolled seamless steel pipe tension reducer rolls for Φ140 seamless steel pipe continuous rolling mill. Components are shown in Table 1 by weight percentage (%Wt).

[0049] The balance in Table 1 is Fe; composite strengthening particles B 4 The amount of C added is 30kg per ton of molten steel

[0050] C Si mn Cr Ni Mo Al Ti RE Zr Ce Sb Y P S 1.9 0.81 0.48 1.26 0.11 0.13 0.27 0.28 0.14 0.07 0.04 0.02 0.01 0.02 0.01

[0051] The smelting, strengthening composite, inoculation spheroidization, casting, heat treatment and machining processes in this embodiment are all carried out according to the steps of the preparation method.

[0052] According to the design ratio, various elements such as ferrotitanium, rare earth silicon, zirconium sponge, cerium, a...

Embodiment 2

[0056] refer to figure 1The schematic diagram of the roll structure. Example 2 is to manufacture 3 rolls of a three-roller hot-rolled seamless steel pipe sizing mill for a continuous rolling mill of Φ250 seamless steel pipe. The weight is 265kg / piece, and the matrix components are shown in Table 1 by weight percentage (%Wt).

[0057] The balance in Table 2 is Fe; composite strengthening particles B 4 The amount of C added is 20kg per ton of molten steel

[0058] C Si mn Cr Ni Mo Al Ti RE Zr Ce Sb Y P S 1.6 1.02 0.35 1.02 0.09 0.1 0.21 0.18 0.1 0.06 0.02 0.02 0.01 0.02 0.01

[0059] The preparation steps of Example 2 are the same as those of Example 1, and the processes of smelting, strengthening compounding, inoculation and spheroidization, casting, heat treatment, and machining are all carried out according to the steps of the preparation method.

[0060] According to the design ratio, various elements such as ferrotitan...

Embodiment 3

[0064] refer to figure 2 The schematic diagram of the roll structure, half of its section is approximately "M" shape. Example 3 is to manufacture 3 rolls of a three-roller hot-rolled seamless steel pipe sizing mill for a Φ460 seamless steel pipe continuous rolling mill. See Table 1 for matrix components by weight percentage (%Wt).

[0065] The balance in Table 3 is Fe; composite strengthening particles B 4 The amount of C added is 10kg per ton of molten steel

[0066] C Si mn Cr Ni Mo Al Ti RE Zr Ce Sb Y P S 1.5 1.2 0.31 0.82 0.08 0.07 0.10 0.06 0.14 0.04 0.04 0.02 0.01 0.02 0.01

[0067] The preparation steps of Example 3 are the same as those of Examples 1 and 2, wherein the amount of industrially pure iron powder is 0.8 times the total amount of ferrotitanium, rare earth silicon, zirconium sponge, cerium, antimony, and boron carbide powder. 20 minutes before the molten steel comes out of the furnace, three steel cont...

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Abstract

The invention provides a multi-element composite strengthened alloy semisteel sizing / reducing machine roller and a preparation method thereof, and discloses a multi-element composite strengthened alloy semisteel roller used for a hot-rolled seamless steel pipe sizing or reducing machine. The rolleris made of a multi-element composite alloy and composite strengthened particles. Strengthening and compounding of the multi-element alloy are carried out in the smelting process, multiple elements, the composite strengthened particles and the like are evenly mixed together according to the design proportion so as to be rapidly molten in molten liquid, and the mixture and the molten liquid are fully and evenly molten to achieve strengthening and compounding. By means of the roller, consumption ofprecious metal of Ni, Mo and the like can be reduced, the performance advantages of wear resisting, corrosion resisting, invasion deformation resisting, machining and the like under high-temperature chilling are achieved, after using, the surface of the roller is bright, the service life is 1.5 times or above that of a high nickel and molybdenum alloy ductile iron steel pipe roller, the service performance is excellent, and materials are saved.

Description

technical field [0001] The invention relates to the technical field of casting roll manufacturing, in particular to a multi-element compound reinforced alloy semi-steel sizing mill or reducing mill roll for hot-rolled seamless steel pipes and a preparation method thereof. Background technique [0002] The sizing and reducing of the steel pipe is the last waste heat deformation process in the production of hot-rolled seamless steel pipe. Outer diameter accuracy and roundness. The sizing and reducing process of seamless steel pipe is a multi-stand continuous rolling process of steel pipe without mandrel. Sizing is to roll the steel pipe to a certain required dimensional accuracy and roundness under the condition of small total diameter reduction ratio and small single stand diameter reduction ratio, and further improve the surface quality of the steel pipe. In addition to the role of sizing, diameter reduction also requires a larger diameter reduction rate to realize the pro...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/50C22C38/56C22C38/60C21C1/10C21D1/20C21D1/26C21D9/38C22C33/08C22C37/04C22C37/08C22C37/10B21B27/02
CPCB21B27/024C21C1/105C21D1/20C21D1/26C21D9/38C22C33/08C22C37/04C22C37/08C22C37/10C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/44C22C38/50C22C38/56C22C38/60
Inventor 袁厚之张凝刘行一王平
Owner 山东四方工模具材料研究院有限公司
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