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Composite coating for improving surface hardness and wear resistance of U-shaped roller and production process of U-shaped roller

A composite coating and roller surface technology, applied in metal material coating process, coating, roller, etc., can solve the problems of low surface hardness and strength, change of matrix structure, high firing temperature, etc., and achieve good ductility , the effect of improving toughness

Pending Publication Date: 2022-03-25
马鞍山市恒泰重工机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the firing temperature of this scheme is high, and it is easy to cause changes in the structure of the matrix, resulting in low yield and compactness, and low surface hardness and strength.

Method used

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  • Composite coating for improving surface hardness and wear resistance of U-shaped roller and production process of U-shaped roller
  • Composite coating for improving surface hardness and wear resistance of U-shaped roller and production process of U-shaped roller
  • Composite coating for improving surface hardness and wear resistance of U-shaped roller and production process of U-shaped roller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: as Figure 1 to Figure 2 As shown, the production process of U-shaped rollers, the process steps are as follows: first, the billet is spirally roughened, and then preheated to 250-320 °C. The surface of the frequency conversion roller is oxidized or carbonized to form an oxide layer or a carbide diaphragm. Once the diaphragm is formed, it will inevitably affect the bonding ability between the coating and the roller body. By setting the temperature to this temperature range, it will not be on the surface of the roller body. Forming a diaphragm can also effectively improve the bonding ability between the roller body and the coating;

[0031] Secondly, the raw materials of the alloy fusion layer, thermal barrier composite layer and surface working layer are thermally sprayed onto the surface by oxyacetylene gas respectively, and then remelted to obtain a composite coating of semi-fused micro-metallurgy. The remelting temperature is controlled at 1000 ~1200°C...

Embodiment 2

[0040] Embodiment 2: The components of the alloy fusion layer include by weight: 0.8 parts of C, 15 parts of Cr, 3.0 parts of B, 5.0 parts of Si, 13 parts of Fe, the balance being Ni and trace residual impurities, Calculated according to REC=(B+Si) / 5(C+Cr)+Cr / 6Ni, the chemical composition satisfies 0.14≤REC≤0.15; wherein, the composition of the thermal barrier composite layer includes by weight: 0.50 parts of C, 17 parts of Cr, 3.0 parts of B, 5.0 parts of Si, 15 parts of Fe, 3.4 parts of Co, the balance is Ni and trace residual impurities, according to REC=(B+Si) / 5(C+Cr)+ Calculated by (Cr+Co) / 6(Ni+Co)+Co / 8(Ni+Co), the chemical composition satisfies 0.14≤REC≤0.16; wherein, the composition of the surface working layer includes by weight: 2.1 parts of C , 12 parts of Cr, 3.9 parts of B, 3.5 parts of Si, 14 parts of Fe, 37 parts of W, the balance being Ni and trace residual impurities, according to REC=(B+Si) / 5(C+Cr)+ Calculated by (Cr+W) / 6(Ni+W)+W / 12(Ni+W), the chemical compos...

Embodiment 3

[0041] Embodiment 3: The components of the alloy fusion layer include by weight: 1.0 parts of C, 16 parts of Cr, 3.8 parts of B, 4.2 parts of Si, 15 parts of Fe, and the balance is Ni and trace residual impurities, Calculated according to REC=(B+Si) / 5(C+Cr)+Cr / 6Ni, the chemical composition satisfies 0.11≤REC≤0.14; wherein, the composition of the thermal barrier composite layer includes by weight: 0.65 parts of C, 15 parts of Cr, 3.8 parts of B, 3.5 parts of Si, 16 parts of Fe, 2.6 parts of Co, the balance is Ni and trace residual impurities, according to REC=(B+Si) / 5(C+Cr)+ Calculated by (Cr+Co) / 6(Ni+Co)+Co / 8(Ni+Co), the chemical composition satisfies 0.15≤REC≤0.16; wherein, the composition of the surface working layer includes by weight: 2.3 parts of C , 10 parts of Cr, 3.6 parts of B, 3.7 parts of Si, 15 parts of Fe, 33 parts of W, the balance being Ni and trace residual impurities, according to REC=(B+Si) / 5(C+Cr)+ Calculated by (Cr+W) / 6(Ni+W)+W / 12(Ni+W), the chemical compo...

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Abstract

The invention discloses a wear-resistant composite coating for improving the surface hardness of a U-shaped roller and a production process of the U-shaped roller, and belongs to the field of steel rolling metallurgy conveying rollers. The composite coating sequentially comprises an alloy fusion layer, a thermal barrier composite layer and a surface wear-resistant layer from inside to outside, the surface working layer comprises the following components in parts by weight: 2.0-3.0 parts of C, 8-15 parts of Cr, 3.0-4.0 parts of B, 3.5-4.0 parts of Si, 10-15 parts of Fe, 32-38 parts of W and the balance of Ni and trace residual impurities, and according to REC = (B + Si) / 5 (C + Cr) + (Cr + W) / 6 (Ni + W) + W / 12 (Ni + W), chemical components meet the condition that REC is larger than or equal to 0.25 and smaller than or equal to 0.28. Wherein the contents of C, Cr, W, B and Si cannot exceed the range, low-melting-point and high-melting-point substances of B and Si are adopted to reduce the melting point of the whole coating, the situation that the structure of the roller body is changed when all high-melting-point substances are used for spraying is prevented, the wear resistance and heat resistance of the coating can be guaranteed, metal oxide of the roller body is subjected to deoxidation reduction treatment, and the service life of the roller body is prolonged. The solid solution with good strength and plasticity of the components is also favorable for improving the bonding strength.

Description

technical field [0001] The invention relates to the technical field of steel rolling and metallurgical conveying rollers, in particular to a composite coating for improving the surface hardness and wear resistance of U-shaped rollers and a production process for U-shaped rollers. Background technique [0002] At present, the metallurgical rolls commonly used in the metallurgical industry are cast and forged rolls obtained from alloy tool steel through "steelmaking + casting + heat treatment" and "steelmaking + ingot + forging + heat treatment". This traditional metallurgical roll has the largest The biggest problem is that after the surface is worn or dropped, it can only be repaired by one repair welding, and the bonding strength between the repair welding metal and the substrate is greatly reduced, so the life cycle is relatively short. Under the premise of continuous production, the life cycle of each roll (that is, before repair) is only 3-6 days, and the life cycle afte...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C19/05C22C30/00B65G39/02
CPCC23C24/106C22C30/00C22C19/056B65G39/02Y02P10/20
Inventor 陈道龙陈治鹏陈楠戴伏剑周俊立张万春张明兰
Owner 马鞍山市恒泰重工机械有限公司
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