Thermal treatment method for wear-resistant low alloy steel

A heat treatment method and technology for low-alloy steel, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve problems such as difficulty in combining high wear resistance and high toughness, large volume and complex shape, and complex composite process methods. , to achieve the effect of excellent wear resistance, simple process and low production cost

Inactive Publication Date: 2012-10-31
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Since some wear-resistant steel workpieces used in engineering applications often have high weight, large volume and complex shape, it is difficult to have both high wear resistance and high toughness
Bimetal composite wear parts can solve the problem of high wear resistance and high toughness to a certain extent, but the composite process is relatively complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A heat treatment process for wear-resistant low-alloy steel, comprising the following steps:

[0018] (1) Cast workpiece: Low alloy steel composition (unit: mass percentage): 0.25% C, 1.5% Cr; 0.8% Si, 0.9% Mn, 0.5% Mo, 0.8% Ni, 0.06% Nb, 0.05% Ti, P≤0.04%, S≤0.04%, the balance is Fe. The smelting is carried out in an intermediate frequency furnace, the tapping temperature is greater than 1600 °C, the casting temperature is about 1550 °C, the cavity is made of water glass sand, and the size of the low alloy steel casting is 600 mm × 200 mm × 220 mm;

[0019] (2) Put the workpiece casted in step (1) into a resistance furnace, raise the temperature to 1080°C at a rate of 5°C / min, and leave the furnace at a constant temperature for 10 hours;

[0020] (3) Hang the workpiece after being released from the furnace along the length direction of 600mm into the pool equipped with dual-medium quenching liquid. The workpiece 400mm is long in the quenching pool, and the other 200...

Embodiment 2

[0023] A heat treatment process for wear-resistant low-alloy steel, comprising the following steps:

[0024] (1) Cast workpiece: Low alloy steel composition (unit: mass percentage): 0.34% C, 1.3% Cr; 0.7% Si, 1.1% Mn, 0.3% Mo, 0.4% Ni, 0.06% V, P≤0.04% , S≤0.04%, the balance is Fe. The smelting is carried out in an intermediate frequency furnace, the tapping temperature is greater than 1600 °C, the casting temperature is about 1550 °C, the cavity is made of water glass sand, and the size of the low alloy steel casting is 800 mm × 260 mm × 210 mm;

[0025] (2) Put the workpiece casted in step (1) into a resistance furnace, raise the temperature to 900°C at a rate of 5°C / min, and leave the furnace at a constant temperature for 10 hours;

[0026] (3) Hang the workpiece after being released from the furnace along the length direction of 800mm into the pool equipped with dual-medium quenching liquid. The workpiece 600mm is long in the quenching pool, and the other 200mm of t...

Embodiment 3

[0029] A heat treatment process for wear-resistant low-alloy steel, comprising the following steps:

[0030] (1) Cast workpiece: Low alloy steel composition (unit: mass percentage): 0.28% C, 1.7% Cr; 0.7% Si, 0.8% Mn, 0.3% Mo, 0.2% Ni, P≤0.04%, S≤0.04 %, the balance is Fe. The smelting is carried out in an intermediate frequency furnace, the tapping temperature is greater than 1600 °C, the casting temperature is about 1550 °C, the cavity is made of water glass sand, and the size of the low alloy steel casting is 600 mm × 200 mm × 220 mm;

[0031] (2) Put the workpiece casted in step (1) into a resistance furnace, raise the temperature to 950°C at a rate of 5°C / min, and leave the furnace at a constant temperature for 10 hours;

[0032] (3) Hang the workpiece after being released from the furnace into the pool equipped with dual-medium quenching liquid along the length direction of 600mm. The workpiece is 600mm long in the quenching pool, and the top of the workpiece is close...

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Abstract

The invention discloses a thermal treatment method for wear-resistant low alloy steel, and relates to the field of the machining of metal materials. The thermal treatment method provided by the invention comprises the following steps of: heating a low alloy steel workpiece in thermal equipment, discharging out of a furnace after heat preservation at constant temperature, immediately putting the part which needs wear resistance in the workpiece discharged out of the furnace into a quenching pond which is filled with water and quenching oil at the same time to be quenched, naturally cooling after quenching, transforming the workpiece into a tempering furnace, preserving the heat in a heating way, and carrying out furnace cooling or air cooling in a discharging way after the heat is preserved. The thermal treatment method disclosed by the invention has the characteristics that the local water quenching, the local oil quenching and the local air cooling of the workpiece can be combined with one another, the hardness, the strength and the abrasive resistance of the part which is easy to wear in the workpiece can be improved as required, the workpiece is guaranteed to be hard to wear, the impact toughness of the part which needs high tenancy can be guaranteed, the whole comprehensive mechanical property of the workpiece can be improved, and the use requirement of wear-resistant pieces such as the wear-resistant plate hammer, the lining plate, the hammer head, the impact plate, the bucket teeth and the like can be met. The thermal treatment method disclosed by the invention has the advantages of being simple and easy, and low in production cost.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a heat treatment method for wear-resistant low-alloy steel. Background technique [0002] A large number of wear-resistant steel workpieces are used in mining, metallurgy, electric power, construction, agriculture, cement production and other mechanical equipment, such as ball mills, crushers, excavators, bulldozers, loaders and other equipment. The current wear-resistant steel materials are mainly high manganese steel, medium manganese steel, high chromium steel, medium chromium steel, etc. The quenching heat treatment process basically adopts single medium quenching, such as water quenching, oil quenching or air quenching. [0003] Wear-resistant high manganese steel (Mn13, its chemical composition: 0.90~1.35 wt.% C, 11.00~14.00 wt.% Mn, 0.30~0.80 wt.% Si) is austenitic steel, After casting and water toughening treatment, the structure is single austenite, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D11/00C22C38/58C22C38/54C22C38/50C22C38/48C22C38/46C22C38/44C22C38/38C22C38/34C22C38/32C22C38/28C22C38/26C22C38/24C22C38/22C22C38/18
Inventor 李卫刘英张治国尤德强
Owner JINAN UNIVERSITY
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