Preparation method of super-thick alloy steel plate

A technology of alloy steel plate and alloy steel, which is applied in the field of preparation of extra-thick alloy steel plate, can solve the problems of reduced yield rate of alloy extra-thick plate, easy cracking, high crack sensitivity of weld, etc., so as to improve yield rate and save welding time, the effect of avoiding crack susceptibility

Active Publication Date: 2014-04-02
沈阳科安捷材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of using vacuum welding to encapsulate high-strength alloy steel plates with high carbon equivalent (carbon equivalent ≥ 0.3%), due to the high crack sensitivity of the weld, the joint is

Method used

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  • Preparation method of super-thick alloy steel plate
  • Preparation method of super-thick alloy steel plate
  • Preparation method of super-thick alloy steel plate

Examples

Experimental program
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Effect test

Example Embodiment

[0032] Example 1

[0033] Take S50C die steel as an example, its carbon equivalent is ~0.7%.

[0034] (1) Surface treatment: Two pieces of S50C die steel continuous casting slabs with a single billet size of 3m×2m×200mm are selected, and the surface of the continuous casting slab is shot blasted with a shot blasting machine. The cast slab passes through a demagnetization coil with high frequency alternating current to make the remanence of the continuous casting slab ≤3mT. Finally, a milling machine is used to remove the rust layer and oxide layer on the entire interface to be composited in the continuous casting slab to make the cleaned continuous casting slab The height difference between the highest point and the lowest point of the slab composite interface is ≤1mm, the side milling depth is ≥10mm, and the welding position is reserved, and the unilateral dimension deviation of each side of the two continuous casting slabs is ≤5mm;

[0035] (2) Turning and aligning: The two surfac...

Example Embodiment

[0040] Example 2

[0041] Take 15CrMoRH medium temperature hydrogen-prone steel as an example, its carbon equivalent is> 0.3%.

[0042] (1) Surface treatment: Choose two 15CrMoRH medium temperature hydrogen-containing steel continuous casting slabs with a single billet size of 2.5m×1.5m×180mm. First, use a shot blasting machine to shot the surface of the continuous casting slab, and then shot blast The processed continuous casting slab passes a demagnetization coil with high frequency alternating current to make the remanence of the continuous casting slab ≤3mT. Finally, a milling machine is used to remove the rust layer and oxide layer of the entire interface to be composited in the continuous casting slab, so that after cleaning The height difference between the highest point and the lowest point of the continuous casting slab to be composited interface is ≤1mm, the side milling depth is ≥10mm, and the welding position is reserved, and the unilateral dimension deviation of each s...

Example Embodiment

[0048] Example 3

[0049] Choose Q345E low-alloy structural steel as an example, and its carbon equivalent is less than 0.3%.

[0050] (1) Surface treatment: select two Q345E low-alloy structural steel continuous casting slabs with a single billet size of 3m×2m×225mm, first use a shot blasting machine to shot blast the surface of the continuous casting slab, and then shot blast The subsequent continuous casting slab passes through a demagnetization coil with high frequency alternating current to make the remanence of the continuous casting slab ≤3mT. Finally, a milling machine is used to remove the rust and oxide layers on the entire interface to be composited in the continuous casting slab, so that the cleaned The height difference between the highest point and the lowest point of the continuous casting slab composite interface is ≤1mm, the side milling depth is ≥10mm, and the welding position is reserved, and the unilateral dimension deviation of each side of the two continuous c...

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Abstract

The invention belongs to the technical field of metallurgy and particularly relates to a preparation method of a super-thick alloy steel plate. The preparation method comprises steps that surface treatment is performed on two alloy steel continuous casting slabs matched in length and width dimension; the alloy steel continuous casting slabs are overlapped on a steel feeding swing arm of a tilting gear and align to each other; the alloy steel continuous casting slabs are fed into a vacuum chamber and welded through a structure with two electronic guns; when carbon equivalent of the continuous casting slabs to be compounded is smaller than 0.3%, a front electronic gun begins to perform welding from ends of the alloy steel continuous casting slabs, and a rear electronic gun begins to perform welding from middles of the alloy steel continuous casting slabs; when carbon equivalent of the continuous casting slabs to be compounded is higher than or equal to 0.3%, the distance between the two electronic guns is shortened, an electron beam of the front electronic gun is regulated into a defocusing mode, the front electronic gun preheats welding joints, and the rear electronic gun performs welding soon afterwards; heating rolling is performed on the welded slabs to obtain the super-thick alloy steel plate. By means of the technical scheme, compound interfaces between the continuous casting slabs to be compounded completely align, and yield of the super-thick alloy steel plate is increased.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for preparing an extra-thick alloy steel plate. Background technique [0002] After adding a certain amount of alloying elements (including one or more of chromium, nickel, molybdenum, copper, niobium, vanadium, titanium, etc.) to ordinary carbon-manganese steel, excellent high-temperature mechanical properties and high-temperature resistance can be obtained. Various alloy steels with different special properties such as oxidation performance, corrosion resistance, low temperature resistance and non-magnetic properties. At present, alloy steels are widely used in petrochemical, coal conversion, nuclear power, steam turbine cylinder, thermal power and military fields. Among them, there is a very large market gap and extremely high added value for special alloy steel plates (thickness ≥ 100 mm) such as high-grade die steel and high-temperature heat-resistant steel, and ...

Claims

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Application Information

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IPC IPC(8): B23P15/00B23K37/04
CPCB21B1/38B21B2001/386B23K15/0013B23K15/0033B23K15/06B23P15/00
Inventor 骆宗安谢广明王光磊王国栋
Owner 沈阳科安捷材料技术有限公司
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