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Hard alloy roll collar for two-dimensional cold-rolled ribbed steel bar

A cold-rolled ribbed steel bar and hard alloy technology, applied in the direction of rolls, metal rolling, metal rolling, etc., can solve the problems of cracked rolls, non-wear-resistant, and falling blocks, and achieve the problem of wear resistance and meet the Demand for high wear resistance and high toughness, effect of excellent wear resistance and toughness

Inactive Publication Date: 2011-11-23
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The invention provides a cemented carbide roll ring material that satisfies two-dimensional cold-rolled ribbed steel bars. The material has a suitable hardness range of HRA80-84, which solves the problem of the existing cemented carbide roll ring material in the process of cold rolling. The problems of non-abrasion resistance, cracked rolls, and falling blocks meet the requirements of cold-rolled two-dimensional cold-rolled ribbed steel bars for high wear resistance and high toughness of cemented carbide roll rings, and overcome the assembly problems caused by the material of the roll rings. And the processing problem of roller ring groove rib shape

Method used

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  • Hard alloy roll collar for two-dimensional cold-rolled ribbed steel bar
  • Hard alloy roll collar for two-dimensional cold-rolled ribbed steel bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Carbide roll rings for two-dimensional cold rolling of Ф4.0-Ф8.0mm ribbed steel bars.

[0017] According to the adhesive phase 18% (mass percentage), the balance of WC ingredients, the adhesive phase is composed of Co, Ni, Cr, and Co 15.0%, Ni 2.5%, Cr 0.5%, satisfying Ni: (Ni+ Co+ Cr) = 13.8 %, Cr: (Ni+Co+Cr)=2.8%. Using paraffin as a molding agent, adopting spray drying process, large-tonnage compression molding, and dewaxing pressure sintering integrated process (the same as in the following examples), the physical and mechanical properties of the finally obtained cemented carbide roller ring: density (D) 13.70 g / cm 3 ; Hardness HRA83.5; Flexural strength (TRS) 2400 MPa.

Embodiment 2

[0018] Example 2: Carbide roll rings for two-dimensional cold rolling of ribbed steel bars with a diameter of Ф8.0 to Ф12.0 mm.

[0019] According to the adhesive phase 20% (mass percentage), the balance of WC ingredients, the adhesive phase is composed of Co, Ni, Cr, and Co 7.5%, Ni 11.5%, Cr 1%, satisfying Ni: (Ni+ Co+ Cr) = 57.5 %, Cr: (Ni+Co+Cr)=5%. The physical and mechanical properties of the final cemented carbide roller ring: density (D) 13.50 g / cm 3 ; Hardness HRA 82.5; Flexural strength (TRS) 2500 MPa.

Embodiment 3

[0020] Example 3: Carbide roll rings for two-dimensional cold rolling of ribbed steel bars with a diameter of Ф12.0 to Ф16.0 mm.

[0021] According to the adhesive phase 22% (mass percentage), the balance of WC ingredients, the adhesive phase is composed of Co, Ni, Cr, and Co 4.25%, Ni 16.75%, Cr 1.5%, satisfying Ni: (Ni+ Co+ Cr) = 76.1%, Cr: (Ni+Co+Cr)=6.81%. The physical and mechanical properties of the final cemented carbide roller ring: density (D) 13.35 g / cm 3 ; Hardness HRA 81.0; Flexural strength (TRS) 2200 MPa.

[0022] In the cemented carbide roll ring of the above embodiment, three ribs are engraved on the surface of a roll, and the rib shape meets the national standard GB13788-2008. The actual use has been 3 months, and 3000 tons of ribbed steel bars have been rolled. The rib shape of the rolling groove is still relatively clear, and some places are worn out. It can be reused after grinding, and the number of grinding times can reach 10 times. The wear resistance...

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Abstract

The invention discloses a hard alloy roll collar material meeting the requirements of a two-dimensional cold-rolled ribbed steel bar. The hard alloy roll collar material comprises 18-23% of bonding phases by weight and the balance of hard phases WC; and the bonding phase is a cobalt-nickel-chromium composite bonding phase containing 10-85% of Ni by weight, less than or equal to 8% of Cr by weight and the balance of Co. The hard alloy roll collar material disclosed by the invention has an appropriate hardness range of HRA80-84, thereby the problems of easiness in abrasion, roll crack and block falling which are generated in the cold rolling using process of the traditional hard alloy roll collar material are solved, the requirements of the two-dimensional cold-rolled ribbed steel bar on high abrasion resistance and toughness of a hard alloy roll collar are met, and the defects of difficulties in assembly and roll collar groove rib type processing due to the roll collar material are overcome.

Description

technical field [0001] The invention relates to the preparation of hard alloy roll rings by powder metallurgy, in particular to the material of hard alloy roll rings used for two-dimensional cold-rolled ribbed steel bars. Background technique [0002] A large number of national infrastructure construction projects, urbanization, highway, high-speed railway construction, etc., have a huge demand for steel industry construction rebar, that is, ribbed steel bar, which cannot be met by the existing production capacity. Therefore, expanding the production of ribbed steel bars has become an important development direction and an urgent need for iron and steel enterprises. Rebar has hot-rolled rebar and cold-rolled rebar, and cold-rolled rebar is divided into three-dimensional cold-rolled and two-dimensional cold-rolled. Three-dimensional cold-rolled steel bars have been gradually eliminated because they do not meet market demand, and two-dimensional cold-rolled ribbed steel bars ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B27/00
Inventor 王忆民姚曼萍孔卫宏舒军肖可俊
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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