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Process for improving qualified rate of laminated blank of medium carbon alloy steel

A technology of carbon alloy steel and pass rate, which is applied in the process field of improving the pass rate of medium-carbon alloy steel laminated blanks, and can solve the problems of high scrap rate, easy cracks, and high carbon equivalent of medium-carbon alloy steel laminated blanks , to reduce the probability of cracking, increase the heating temperature and reduce the stress

Pending Publication Date: 2022-04-22
SHANDONG IRAETA HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention ensures that the surface of the medium-carbon alloy steel forging has no cracking phenomenon during the manufacturing process through key technological measures such as slab high-temperature stress-relief treatment, overall preheating of the steel billet, increasing the heating temperature, and adding scanning during welding, and solves the problem of medium-carbon alloy steel lamination The carbon equivalent of the billet is high, the stress is large, and cracks are prone to appear during welding, resulting in the high scrap rate of the laminated billet made of medium carbon alloy steel

Method used

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  • Process for improving qualified rate of laminated blank of medium carbon alloy steel

Examples

Experimental program
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Effect test

Embodiment 1

[0036] combine figure 1 As shown in the figure, a process for improving the pass rate of medium carbon alloy steel laminated billet production includes the following steps: 1) high temperature stress relief heat treatment of slab

[0037] In the prior art, the stress-relieving temperature of the slab is generally 600-700°C. In order to fully eliminate the residual stress inside the slab, the slab is kept at a temperature of 920°C to completely austenitize it.

[0038] 2) Slab sawing

[0039] Use a band saw to cut into small unit billets in preparation for subsequent processing.

[0040] 3) Slab milling

[0041] Milling 6 faces of a small unit slab, the roughness of the upper and lower planes is Ra6.3, and the roughness of the surrounding sides is Ra12.5.

[0042] 4) Slab grinding and cleaning

[0043] After the surface treatment of the blank, the cleanliness of the upper and lower surfaces of each blank is RFU≤20.0;

[0044] 5) Slab assembly and spot welding

[0045] The...

Embodiment 2

[0055] Take the forging ring of φ4940xφ4224x799mm of 35CrMo material ordered by a customer as an example.

[0056] The implementation of the present invention includes the following steps:

[0057] 1) Slab high temperature stress relief heat treatment

[0058] The size of the slab (length x width x height) is 6850x2000x300mm. After the re-inspection is passed, the high temperature stress relief treatment is performed, and the heat preservation temperature is 920°C to fully eliminate the residual stress inside the slab;

[0059] 2) Slab sawing

[0060] Sawed into 9 pieces of small unit slabs of size (length x width x height) 1140x2000x300mm;

[0061] 3) Slab milling

[0062] The small unit slab is milled with 6 faces, the size is (length x width x height) 1120x1985x291mm, the roughness of the upper and lower sides is Ra6.3, and the remaining faces are Ra12.5;

[0063] 4) Slab grinding and cleaning

[0064] After the surface of the blank is ground and cleaned, the cleanline...

Embodiment 3

[0086] Take the forging ring of φ6770xφ6160x430mm made of 42CrMo ordered by a customer as an example.

[0087] A process for improving the pass rate of medium carbon alloy steel laminated billet production, comprising the following steps: the implementation of the present invention comprises the following steps:

[0088] 1) Slab high temperature stress relief heat treatment

[0089] The slab size (length x width x height) is 6850x2000x300mm. After the re-inspection is passed, the high temperature stress relief treatment is performed, and the heat preservation temperature is 950℃.

[0090] 2) Slab sawing: sawing and cutting into 9 pieces of small unit slabs of size (length x width x height) 1712x998x300mm.

[0091] 3) Slab milling: Small unit slab milling has 6 faces, the size is (length x width x height) 1700x985x290mm, the upper and lower roughness is Ra6.3, and the remaining faces are Ra12.5.

[0092] 4) After grinding and cleaning the slab, after grinding and cleaning, th...

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Abstract

The invention discloses a process for improving the qualified rate of laminated blank manufacturing of medium carbon alloy steel. The process comprises the following steps: carrying out high-temperature destressing heat treatment on a plate blank; sawing the plate blank; milling the plate blank; polishing and cleaning the plate blank; plate blank assembling and spot welding are carried out; integrally preheating the steel billet; officially welding the steel billet; modifying a welding seam; heating the seal welding steel billet; and sealing and welding steel billet construction. Through key process measures such as slab high-temperature destressing treatment, overall billet preheating, heating temperature increasing and scanning increasing during welding, it is guaranteed that the surface of the medium-carbon alloy steel forge piece is not cracked in the manufacturing process, the residual stress in the slab is effectively reduced, and the problems that medium-carbon alloy steel laminated blank manufacturing is high in carbon equivalent, large in stress and poor in quality are solved. And cracks are easy to occur during welding, so that the rejection rate of laminated blanks of the medium-carbon alloy steel is high, and the product quality is effectively improved.

Description

technical field [0001] The invention relates to the technical field of heat treatment of steel, in particular to a process for improving the pass rate of medium carbon alloy steel laminated billet. Background technique [0002] The process of laminating billet making is to use continuous casting slab as raw material, and the thickness of continuous casting slab is generally 200-300mm. Welding of small-unit continuous casting slabs. [0003] Due to the high carbon content and alloy content of medium carbon alloy steel, the overall carbon equivalent is high and the stress is large. It is very easy to crack during welding, resulting in a particularly high scrapping rate of medium carbon alloy steel laminated billet. The present invention is to solve the problem of welding cracking of medium carbon alloy steel. SUMMARY OF THE INVENTION [0004] The present invention is to overcome the above-mentioned shortcomings of the prior art, and provides a process for improving the pas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 银伟任秀凤李敏赵丽美赵兴明李玲刘兰潇赵方娜刘丹丹刘允良
Owner SHANDONG IRAETA HEAVY IND
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