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Steel for saw web and hot rolled steel plate production method thereof

A hot-rolled steel plate and production method technology, applied in the field of metallurgy, can solve the problems of insufficient hardenability, difficulty in hot rolling, easy cracks and fractures, etc., and achieve improved hardenability and tempering resistance stability, wear resistance and Good fatigue strength, plasticity and toughness improvement effect

Active Publication Date: 2018-07-27
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual saw blade base material is 50Mn2V, which belongs to medium carbon steel, but its hardenability is poor, resulting in low hardness of the saw blade after heat treatment; insufficient hardenability, resulting in low and uneven hardness of the steel plate after quenching; slab continuous casting, heat treatment Difficult rolling, high sensitivity to slab defects, large segregation of chemical elements, easy to produce cracks and breaks, high strength of the steel plate after rolling, large residual stress, poor shape, and inconvenient for users to perform mechanical processing, cold processing and heat treatment; The stability of tempering resistance is poor, and the hardness of the tempered saw blade will decrease rapidly after quenching at a higher temperature, and there are many quality problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In this embodiment, a steel for saw blades, the chemical composition and mass percentage of the steel plate are: C: 0.73%, Si: 0.20%, Mn: 1.1%, P: 0.015%, S: 0.015%, Als: 0.015 %, Ca: 0.0020%, Cr: 0.41%, V: 0.13%, and the rest are Fe and unavoidable impurities.

[0019] The production method of a hot-rolled steel plate of saw blade steel in this embodiment includes smelting, continuous casting, heating, rolling, and straightening processes, and the specific process steps are as follows:

[0020] (1) Continuous casting process: smelting molten steel for continuous casting, the superheat of molten steel is 11°C; the slab casting speed is 0.95m / min; the slab continuous casting process uses electromagnetic stirring and light reduction technology; The water supply is 1.1L / kg; high-carbon mold slag is used in the casting process; the slab is directly hot-sent and hot-charged for rolling;

[0021] (2) Heating process: the continuous casting slab is heated in the continuous fu...

Embodiment 2

[0026] In this embodiment, a steel for saw blades, the chemical composition and mass percentage of the steel plate are: C: 0.75%, Si: 0.17%, Mn: 0.95%, P: 0.03%, S: 0.02%, Als: 0.020 %, Ca: 0.0012%, Cr: 0.37%, V: 0.15%, and the rest are Fe and unavoidable impurities.

[0027] The production method of a hot-rolled steel plate of saw blade steel in this embodiment includes smelting, continuous casting, heating, rolling, and straightening processes, and the specific process steps are as follows:

[0028] (1) Continuous casting process: smelting molten steel for continuous casting, the superheat of molten steel is 14°C; the slab casting speed is 1.05m / min; The water supply is 1.2L / kg; high-carbon mold slag is used in the casting process; the slabs are piled cold and wait for rolling;

[0029] (2) Heating process: the continuous casting slab is heated in the continuous furnace, the preheating section is 920°C, the first heating section is 1060°C, the second heating section is 1270...

Embodiment 3

[0034] In this embodiment, a steel for saw blades, the chemical composition and mass percentage of the steel plate are: C: 0.77%, Si: 0.22%, Mn: 1.20%, P: 0.016%, S: 0.005%, Als: 0.018 %, Ca: 0.0016%, Cr: 0.44%, V: 0.18%, and the rest are Fe and unavoidable impurities.

[0035] The production method of a hot-rolled steel plate of saw blade steel in this embodiment includes smelting, continuous casting, heating, rolling, and straightening processes, and the specific process steps are as follows:

[0036] (1) Continuous casting process: smelting molten steel for continuous casting, the superheat of molten steel is 10°C; the slab casting speed is 1.00m / min; the slab continuous casting process adopts electromagnetic stirring and light reduction technology; The water supply is 1.1L / kg; high-carbon mold slag is used in the casting process; the slabs are piled cold and wait for rolling;

[0037] (2) Heating process: the continuous casting slab is heated in the continuous furnace, th...

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Abstract

The invention discloses steel for a saw web and a hot rolled steel plate production method thereof. The steel for the saw web comprises the chemical compositions of, by mass, 0.73-0.77% of C, 0.16-0.26% of Si, 0.80-1.20% of Mn, no larger than 0.03% of P, no larger than 0.03% of S, 0.005-0.020% of Als, 0.0008-0.0022% of Ca, 0.35-0.49% of Cr, 0.11-0.20% of V, and the balance Fe and unavoidable impurities; and the production method comprises the following processes of smelting, continuous casting, heating, rolling and straightening. The plasticity and toughness of steel plates manufactured by thehot rolled steel plate production method are improved, the tissue distribution is even, the shape, dimensional precision and surface quality are improved, and wear-resisting property and fatigue strength are good, and the steel plates are suitable for manufacturing thicker saw webs.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of steel for saw blades and hot-rolled steel plates. Background technique [0002] Saw blades are widely used in stone processing, road infrastructure, etc. because of their superior cutting performance and wear resistance. The steel plate for saw blade is a commonly used alloy structural steel plate, which has good strength, wear resistance and weldability after heat treatment. The usual saw blade base material is 50Mn2V, which belongs to medium carbon steel, but its hardenability is poor, resulting in low hardness of the saw blade after heat treatment; insufficient hardenability, resulting in low and uneven hardness of the steel plate after quenching; slab continuous casting, heat treatment Difficult rolling, high sensitivity to slab defects, large segregation of chemical elements, easy to produce cracks and breaks, high strength of the steel...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/24C21D8/02B22D11/00
CPCB22D11/001C21D8/0226C21D8/0242C22C38/02C22C38/04C22C38/06C22C38/24
Inventor 李行秦坤尹绍江任树洋王云阁石晓伟孟庆勇刘志勇李可斌
Owner TANGSHAN IRON & STEEL GROUP
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