Method for preparing medium and low carbon chrome-silicon-manganese martensite cast steel with hardening surface layer

A low-carbon chromium and martensite technology, applied in the field of martensitic cast steel preparation, can solve the problems of workpiece surface deformation, affecting workpiece accuracy and service life, complicated loading conditions, etc. Effect

Inactive Publication Date: 2013-01-16
夏雨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, medium and low-carbon chromium-silicon-manganese martensitic cast steel is mostly used to bear a variety of working loads, and the loading situation is more complicated. To improve the bearing capacity of the workpiece surface, it is necessary to harden the surface, while the traditional hardening process , such as carburizing, nitriding and other surface chemical treatments, induction surface hardening, flame surface hardening, etc., there are problems such as large surface deformation of the workpiece after heat treatment, which affects the accuracy and service life of the workpiece

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Configure raw materials (wt%) according to the following components:

[0025] C: 0.26

[0026] Si: 0.95

[0027] Mn: 0.70

[0028] Cr: 0.70

[0029] Impurities: <0.05

[0030] The balance is Fe;

[0031] Smelting in an intermediate frequency coreless induction furnace, first melting carbon steel, adding ferrochrome with the material, after the furnace material is melted, adding ferrosilicon and ferromanganese, the size of ferrosilicon and ferromanganese is 60mm, and then Smelting and alloying;

[0032] 2) After deoxidizing with aluminum, it is released from the furnace, and cast into castings with clay sand and damp type, and after cooling, it is cleaned and polished for surface treatment;

[0033] 3) Insulate the cast steel at 830°C for 550s to complete all austenitization treatments;

[0034] 4) After step 3), carry out isothermal quenching or incomplete quenching at 180°C, and keep warm for 120s;

[0035] 5) Keep the steel piece treated in step 4) in the t...

Embodiment 2

[0039] 1) Configure raw materials (wt%) according to the following components:

[0040] C: 0.28

[0041] Si: 1.1

[0042] Mn: 0.90

[0043] Cr: 0.95

[0044] Impurities: <0.05

[0045] The balance is Fe;

[0046] Smelting in the intermediate frequency coreless induction furnace, melting carbon steel first, loading ferrochrome with the material, after the furnace material is melted, adding ferrosilicon and ferromanganese, the size of ferrosilicon and ferromanganese is 50mm, and then Smelting and alloying;

[0047] 2) After deoxidizing with aluminum, it is released from the furnace, and cast into castings with clay sand and damp type, and after cooling, it is cleaned and polished for surface treatment;

[0048] 3) Insulate the cast steel at 840°C for 580s to complete the austenitization treatment;

[0049] 4) After step 3), carry out isothermal quenching or incomplete quenching at 210°C, and keep warm for 180s;

[0050] 5) Keep the steel piece treated in step 4) in the t...

Embodiment 3

[0054] 1) Configure raw materials (wt%) according to the following components:

[0055] C: 0.4

[0056]Si: 1.3

[0057] Mn: 1.20

[0058] Cr: 1.10

[0059] Impurities: <0.05

[0060] The balance is Fe;

[0061] Smelting in an intermediate frequency coreless induction furnace, first melting carbon steel, adding ferrochrome with the material, after the furnace material is melted, adding ferrosilicon and ferromanganese when the furnace temperature reaches 1600°C, the size of ferrosilicon and ferromanganese is 60mm, and then Smelting and alloying;

[0062] 2) After deoxidizing with aluminum, it is released from the furnace, and cast into castings with clay sand and damp type, and after cooling, it is cleaned and polished for surface treatment;

[0063] 3) Insulate the cast steel for 600s at a temperature of 860°C to complete all austenitization treatments;

[0064] 4) After step 3), carry out isothermal quenching or incomplete quenching at 230°C, and keep warm for 240s;

...

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Abstract

The invention relates to a method for preparing a medium and low carbon chrome-silicon-manganese martensite cast steel with a hardening surface layer. The cast steel comprises the following components (wt%): 0.26-0.4 of C, 0.95-1.3 of Si, 0.70-1.20 of Mn, 0.70-1.10 of Cr, less than 0.05 of impurities and the balance of Fe; then, the cast steel is prepared from the steps of smelting-casting-cleaning and polishing-thermal insulating at the temperature of 830 DEG C-860 DEGC for 550-600 seconds-quenching or incompletely quenching at constant temperature of 180-230 DEGC and thermal insulating for 120-240 seconds-thermal insulating for 180-300 seconds within the temperature range of 340-430 DEGC-quenching to the room temperature-heating the surface of a steel piece in a scanning mode through a cross flow tube-sheet type multimode continuous carbon dioxide laser; and the steel piece treated through the method disclosed by the invention keeps high strength and has certain plasticity and high surface hardness at the same time, moreover, a workpiece is kept not to deform, and the comprehensive mechanical property is obviously improved than a conventional technology.

Description

technical field [0001] The invention relates to a method for preparing martensitic cast steel, which belongs to the field of steel manufacturing, and in particular to the preparation of a medium-low carbon chromium-silicon-manganese martensitic cast steel with high strength, high ductility and high surface hardness method. Background technique [0002] In the production of wear-resistant materials, medium and low carbon chromium-silicon-manganese martensitic cast steel occupies a considerable proportion. Medium-low carbon martensitic steel is usually used for high-strength quenched and tempered steel, which has high strength and toughness, high hardenability, medium cold deformation plasticity, and good cutting performance. Because it does not contain precious metal elements and is cheap, it is mostly used to manufacture various important parts with high load and high speed, such as gears, shafts, clutches, sprockets, grinding wheel shafts, bushings, bolts, nuts, etc., and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C33/06C21D1/18C21D1/09
Inventor 夏雨
Owner 夏雨
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