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Steel for shield machine cutting tool and manufacturing method thereof

A shield machine tool and manufacturing method technology, which is applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of poor comprehensive performance of tool steel, reduce raw material costs, refine and homogenize the microstructure, and ensure Effects of tissue hardening and thermal stability

Inactive Publication Date: 2018-09-04
HUBEI SHANGDA MODEL MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of poor comprehensive performance of cutting tool steel in the prior art, and provide a shield machine cutting tool steel with better comprehensive performance and its manufacturing method

Method used

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  • Steel for shield machine cutting tool and manufacturing method thereof
  • Steel for shield machine cutting tool and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A steel for a shield machine tool, the composition and mass percentage of the steel for a shield machine tool are:

[0055] C: 0.72%, Si: 0.18%, Mn: 0.48%, Cr: 5.18%, Mo: 2.32%, V: 0.50%, P<0.020%, S<0.005%, the balance is Fe and unavoidable impurities.

[0056] A manufacturing method of steel for a shield machine tool, the manufacturing method comprising the following steps:

[0057] The first step: induction furnace smelting, batching the mass percentage of each alloy raw material component element of the steel for the shield machine tool, the chemical composition of the alloy is composed of the following elements: C: 0.72%, Si: 0.18%, Mn: 0.48%, Cr: 5.18%, Mo: 2.32%, V: 0.50%, the balance is Fe and unavoidable impurity elements, of which impurity elements P<0.020%, S<0.005%; Put it into an induction furnace for smelting, and then cast it into a Φ360mm×2200mm electrode rod;

[0058] The second step: remelting in an electroslag furnace. The electrode rod prepared in ...

Embodiment 2

[0069] A steel for a shield machine tool, the composition and mass percentage of the steel for a shield machine tool are:

[0070] C: 0.75%, Si: 0.25%, Mn: 0.54%, Cr: 5.06%, Mo: 2.40%, V: 0.60%, P<0.020%, S<0.005%, and the balance is Fe and unavoidable impurities.

[0071]A manufacturing method of steel for a shield machine tool, the manufacturing method comprising the following steps:

[0072] The first step: induction furnace smelting, batching the mass percentage of each alloy raw material component element of the steel for the shield machine tool, the chemical composition of the alloy is composed of the following elements: C: 0.75%, Si: 0.25%, Mn: 0.54%, Cr: 5.06%, Mo: 2.40%, V: 0.60%, the balance is Fe and unavoidable impurity elements, of which impurity elements P<0.020%, S<0.005%; Put it into an induction furnace for melting, and then cast it into a Φ280mm×2500mm electrode rod;

[0073] The second step: remelting in an electroslag furnace. The electrode rod prepared i...

Embodiment 3

[0084] A steel for a shield machine tool, the composition and mass percentage of the steel for a shield machine tool are:

[0085] C: 0.73%, Si: 0.20%, Mn: 0.51%, Cr: 5.05%, Mo: 2.35%, V: 0.56%, P<0.020%, S<0.005%, the balance is Fe and unavoidable impurities.

[0086] A manufacturing method of steel for a shield machine tool, the manufacturing method comprising the following steps:

[0087] The first step: induction furnace smelting, batching the mass percentage of each alloy raw material component element of the shield machine tool steel, the chemical composition of the alloy is composed of the following elements: C: 0.73%, Si: 0.20%, Mn: 0.51%, Cr: 5.05%, Mo: 2.35%, V: 0.56%, the balance is Fe and unavoidable impurity elements, of which impurity elements P<0.020%, S<0.005%; Put it into an induction furnace for smelting, and then cast it into a Φ400mm×2100mm electrode rod;

[0088] The second step: remelting in an electroslag furnace. The electrode rod prepared in the firs...

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Abstract

The invention discloses steel for a shield machine cutting tool. The steel for the shield machine cutting tool comprises the components of, by mass, 0.70-0.75% of C, 0.15-0.25% of Si, 0.45-0.55% of Mn, 5.00-5.20% of Cr, 2.30-2.40% of Mo, 0.50-0.60% of V, less than 0.020% of P, less than 0.005% of S, and the balance Fe and inevitable impurities. The steel for the shield machine cutting tool is manufactured by melting of an induction furnace, remelting of an electroslag furnace, three-dimensional refinement uniforming, FM forging and post-forging heat treatment. The steel has high abrasion performance, high hardness and good tenacity. Large sized carbides in a steel ingot are thoroughly fragmented by the FM forging, and existence of tensile stress in a forge piece is avoided.

Description

technical field [0001] The invention relates to a steel for a shield machine tool, in particular to a steel for a shield machine tool and a manufacturing method thereof, which is particularly suitable for improving the toughness, rigidity and wear resistance of the steel for a shield machine. Background technique [0002] Shield machines (shield tunnel boring machines) are widely used in major projects such as subways, highways and railways, energy transmission, and underground passages. They have the advantages of fast excavation, safety, environmental protection, and economy. The shield machine tool is the tooth of the shield machine and the main part of the shield machine to realize the tunneling function. Since the cutting tool should not only be wear-resistant during excavation, but also avoid cracking or plastic deformation when subjected to a huge impact, the material of the cutting tool should have high hardness, high strength and good impact toughness. The shield m...

Claims

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Application Information

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IPC IPC(8): C22C38/22C22C38/24C22C38/02C22C38/04C22C33/04C21D8/00C21D9/22
CPCC22C38/22C21D8/005C21D9/22C22C33/04C22C38/02C22C38/04C22C38/24
Inventor 李民华
Owner HUBEI SHANGDA MODEL MATERIAL TECH
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