Heat processing technology for improving impact energy of 20CrNiMo alloy steel

An alloy steel and impact energy technology, which is applied in the field of heat treatment process for improving the impact energy of 20CrNiMo alloy steel, can solve the problems of low impact energy and the inability of 20CrNiMo alloy steel to fully function due to its good properties, and achieves good impact resistance and a wide range of applications. , the effect of good impact energy

Inactive Publication Date: 2015-07-29
XIAN COAL MINING MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By improving the heat treatment process of 20CrNiMo alloy steel, the invention solves the problem that other good properties of 20CrNiMo

Method used

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  • Heat processing technology for improving impact energy of 20CrNiMo alloy steel
  • Heat processing technology for improving impact energy of 20CrNiMo alloy steel
  • Heat processing technology for improving impact energy of 20CrNiMo alloy steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The heat treatment process that present embodiment improves 20CrNiMo alloy steel impact energy comprises the following steps:

[0034] Step 1, carburizing: Carburizing the 20CrNiMo alloy steel after electroslag remelting at a temperature of 930°C until the carburizing layer has a depth of 1.5mm;

[0035] Step 2, primary quenching: the 20CrNiMo alloy steel after carburizing in step 1 is cooled to 880°C, kept at a carbon potential of 0.85% for 2.5h, and then oil quenched;

[0036] Step 3, primary tempering: heat up the 20CrNiMo alloy steel after primary quenching in step 2 to 600°C, keep it warm for 3 hours, and then air-cool;

[0037] Step 4, secondary quenching: heat up the 20CrNiMo alloy steel after the primary tempering in step 3 to 840° C., heat it for 3 hours under the condition that the carbon potential is 0.85%, and then quench it with oil;

[0038] Step 5, secondary tempering: heat up the 20CrNiMo alloy steel after secondary quenching in step 4 to 200° C., keep ...

Embodiment 2

[0040] The heat treatment process that present embodiment improves 20CrNiMo alloy steel impact energy comprises the following steps:

[0041] Step 1, carburizing: Carburizing the 20CrNiMo alloy steel after electroslag remelting at a temperature of 930°C until the carburizing layer has a depth of 1.7 mm;

[0042] Step 2, primary quenching: the 20CrNiMo alloy steel after carburizing in step 1 is cooled to 890°C, kept at a carbon potential of 0.9% for 2.5h, and then oil quenched;

[0043] Step 3, primary tempering: heat up the 20CrNiMo alloy steel after primary quenching in step 2 to 610°C, keep it warm for 3 hours, and then air-cool;

[0044] Step 4, secondary quenching: heat up the 20CrNiMo alloy steel after the primary tempering in step 3 to 850°C, heat it for 3 hours under the condition of carbon potential of 0.9%, and then oil quench;

[0045] Step 5, secondary tempering: heat up the 20CrNiMo alloy steel after secondary quenching in step 4 to 210° C., keep it warm for 4 hours...

Embodiment 3

[0047] The heat treatment process that present embodiment improves 20CrNiMo alloy steel impact energy comprises the following steps:

[0048] Step 1, carburizing: Carburizing the 20CrNiMo alloy steel after electroslag remelting at a temperature of 930°C until the carburizing layer has a depth of 1.4mm;

[0049] Step 2, primary quenching: the 20CrNiMo alloy steel after carburizing in step 1 is cooled to 870°C, kept at a carbon potential of 0.8% for 2.5h, and then oil quenched;

[0050] Step 3, primary tempering: heat up the 20CrNiMo alloy steel after primary quenching in step 2 to 590°C, keep it warm for 3 hours, and then air-cool;

[0051] Step 4, secondary quenching: heat up the 20CrNiMo alloy steel after the primary tempering in step 3 to 830°C, heat it for 3 hours under the condition that the carbon potential is 0.8%, and then quench it with oil;

[0052] Step 5, secondary tempering: heat up the 20CrNiMo alloy steel after secondary quenching in step 4 to 190° C., keep it w...

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Abstract

The invention provides a heat processing technology for improving the impact energy of 20CrNiMo alloy steel. The technology includes the following steps: I, performing carburizing treatment to the 20CrNiMo alloy steel until the depth of a carburizing layer reaches 1.4 mm to 1.7 mm; II, performing primary quenching; III, performing primary tempering, V, performing secondary quenching; IV, performing secondary tempering. According to the invention, through improving the heat processing technology of the 20CrNiMo alloy steel, the problem that other excellent performances of the 20CrNiMo alloy steel cannot be fully exerted due to lower impact energy is solved, the material usability is better, and the application range is wider.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of mechanical materials, and in particular relates to a heat treatment process for improving the impact energy of 20CrNiMo alloy steel. Background technique [0002] 20CrNiMo alloy steel is a grade of alloy structural steel stipulated in the Chinese national standard "GB / T 3077-1999", and its unified number code is A50202. [0003] According to the national standard, the heat treatment process of 20CrNiMo alloy steel is as follows: forging temperature: 1177°C-1232°C; normalizing temperature: 899°C-954°C; hardness: 187HBW; carburizing temperature: 899°C-927°C; quenching temperature: 850°C , Coolant: oil; tempering temperature: 200 ℃, coolant: air. The obtained mechanical properties are as follows: impact energy Akv: ≥47J; impact toughness value αkv: ≥59J / cm 2 . [0004] Due to the high hardenability of 20CrNiMo alloy steel, no temper brittleness, good weldability, little tendency to form ...

Claims

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Application Information

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IPC IPC(8): C23F17/00C21D1/19C21D6/00
Inventor 马民政宋泽锋王培科王维发史秀宝姜海鹏王星袁泽清郑阳雷凯凯王先龙
Owner XIAN COAL MINING MACHINERY
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