Short process manufacturing method of large 30crni2mov steel parts

A manufacturing method and short-process technology, which is applied in the short-process manufacturing of 30CrNi2MoV steel parts and the forging field of large-scale 30CrNi2MoV steel parts, can solve the problems of difficult performance guarantee, high cost, and complicated manufacturing process, and achieve low manufacturing cost and high production efficiency High, short manufacturing process

Active Publication Date: 2017-12-15
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to invent a short-process forging and Subsequent quenching + tempering final heat treatment method, through this method can quickly obtain fine-grained high-low temperature impact toughness and high room temperature strength 30CrNi2MoV steel forgings to meet production needs

Method used

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  • Short process manufacturing method of large 30crni2mov steel parts
  • Short process manufacturing method of large 30crni2mov steel parts
  • Short process manufacturing method of large 30crni2mov steel parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The 30CrNi2MoV steel forging billet is forged with 2 times of upsetting and 1 time of upsetting, and the total forging ratio is 10; then it is quenched with oil cooling after 860°C´6h+780°C´2h heat preservation + 600°C´16h oil cooling after heat preservation of tempering.

[0032] The 30CrNi2MoV steel forgings subjected to such heat treatment have an average grain size of 10-30mm ( figure 1 ), low temperature impact toughness A at -40°C KV (-40°C) is 103J, and the tensile strength at room temperature is R m is 1161.6 MPa, room temperature elongation A 5 was 37.8%.

Embodiment 2

[0034] The 30CrNi2MoV steel forging billet is forged with 2 times of upsetting + 1 time of upsetting + 1 time of elongation, the total forging ratio is 14; then it is quenched with oil cooling at 860℃´6h+780℃´2h after heat preservation + 600℃´ After 16 hours of heat preservation, oil-cooled tempering.

[0035]The 30CrNi2MoV steel forgings subjected to such heat treatment have an average grain size of 10-30mm ( figure 2 ), low temperature impact toughness A at -40°C KV (-40°C) is 87J, and the tensile strength at room temperature is R m 1157.4 MPa, room temperature elongation A 5 was 36.13%.

Embodiment 3

[0040] The 30CrNi2MoV steel forging billet is forged with 2 times of upsetting and 1 time of upsetting, and the total forging ratio is 10; then it is quenched by oil cooling after 860°C´6h heat preservation + 600°C´16h heat preservation and then air-cooled tempering.

[0041] The 30CrNi2MoV steel forgings subjected to such heat treatment have an average grain size of 10-30mm ( Figure 4 ), low temperature impact toughness A at -40°C KV (-40°C) is 87.67J, the tensile strength at room temperature R m 1215.5 MPa, room temperature elongation A 5 was 35.53%.

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Abstract

A short-process manufacture method for a large 30CrNi2MoV steel piece is characterized by comprising a repeated firing forging process and a follow-up quenching plus final tempering heat processing process which are carried out in sequence; the repeated firing forging process comprises two times of pulling forging plus one time of upsetting forging which are carried out in sequence or two times of pulling forging plus one time of upsetting forging plus one time of drawing-out forging which are carried out in sequence; the follow-up quenching plus final tempering heat processing process means that forging stock subjected to repeated fire forging undergoes oil-cooled quenching after being maintained at the temperature of 860 DEG C + / - 10 DEG C for 6 hours + / - 0.5 hours and the temperature of 780 DEG C + / - 10 DEG C for 2 hours + / - 0.5 hours and oil-cooled tempering after being maintained at the temperature of 600 DEG C + / - 10 DEG C for 16 hours + / - 0.5 hours or undergoes oil-cooled quenching after being maintained at the temperature of 860 DEG C + / - 10 DEG C for 6 hours + / - 0.5 hours and air-cooled tempering after being maintained at the temperature of 600 DEG C + / - 10 DEG C for 16 hours + / - 0.5 hours or undergoes oil-cooled quenching after being maintained at the temperature of 860 DEG C + / - 10 DEG C for 6 hours + / - 0.5 hours and oil-cooled tempering after being maintained at the temperature of 580 DEG C + / - 10 DEG C for 32 hours + / - 0.5 hours. The method is efficient and reliable.

Description

technical field [0001] The invention relates to a method for manufacturing high-performance steel parts, especially a forging method for large-scale 30CrNi2MoV steel parts with a weight of more than 10 tons. Short-flow manufacturing method for 30CrNi2MoV steel parts with high tensile strength. Background technique [0002] 30CrNi2MoV steel is a medium-carbon medium-alloy steel with high hardenability and good comprehensive mechanical properties. It is often used to manufacture high-strength and high-toughness large forgings (generally weighing more than 4 tons), and is widely used in the manufacture of thermal power, nuclear power, etc. Bearing and transmission structural components in power station equipment and large metallurgy, mining and transportation equipment. 30CrNi2MoV steel often works at lower temperatures, and has higher requirements for its low-temperature impact toughness. [0003] Large forgings must be forged from large ingots, and there must be inhomogenei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00B21J5/00C21D1/18
CPCB21J5/002C21D1/18C21D8/005
Inventor 许晓静陈洋谈成刘庆辉蔡杰朱金鑫丁清胡华军戈晓岚
Owner JIANGSU UNIV
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