Method for welding heterogeneous austenitic stainless steel plates

A technology of austenitic stainless steel and welding method, which is applied in welding equipment, electron beam welding equipment, metal processing equipment, etc., can solve the problems of low strength of nitrogen pore joints, reduce pore defects, improve joint strength, reduce Effect of molten pool metal segregation

Inactive Publication Date: 2012-06-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a vacuum electron beam welding method for single-phase austenitic stainless steel (HR-2) and precipitation-strengthened austenitic stainless steel (J75) heterogeneous plates (thickness 2.0 ~ 5.0mm), to solve the problem of prior art The joints existing in the steel form a γ′-poor area, which is easy to cause nitrogen pores and the joint strength is lower than that of single-phase HR-2 stainless steel.

Method used

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  • Method for welding heterogeneous austenitic stainless steel plates
  • Method for welding heterogeneous austenitic stainless steel plates
  • Method for welding heterogeneous austenitic stainless steel plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: Vacuum electron beam welding of HR-2 stainless steel plate and J75 stainless steel plate of specification 220 (long) × 80 (wide) × 3.2mm (thick)

[0023] The specific implementation process is:

[0024] 1. Both HR-2 stainless steel plate and J75 stainless steel plate blanks are hot-rolled plates. The chemical composition and mechanical properties of the two hot-rolled plates meet the requirements of GJB 5724-2006 "Specification for Hydrogen-resistant Steel Bars". The HR-2 plate was subjected to 1050°C / 1h, water quenching treatment, and the J75 plate was subjected to 980°C / 1h, water quenching +740°C / 8h, and air cooling treatment. The mechanical properties of the two stainless steel plates are shown in Table 1. The plate after heat treatment is machined to 2.0-5.0 mm (3.2 mm in this embodiment), and the length direction is machined to roughness Ra1.0 μm by grinding machine.

[0025] 2. Carry out decontamination treatment on the base metal after polishing tr...

Embodiment 2

[0038] Embodiment 2: Vacuum electron beam welding of HR-2 stainless steel plate and J75 stainless steel plate of specification 220 (length) × 80 (width) × 4.5mm (thick)

[0039] The difference from Example 1 is that the thickness of the welded J75 and HR-2 plates is both 4.5mm, and the welding process parameters and the number of electron beam scanning after welding are adjusted accordingly.

[0040] The same heat-treated HR-2 stainless steel plate and J75 stainless steel plate blanks as in Example 1 were used, machined to a thickness of 4.5 mm after heat treatment, and processed to a roughness of Ra1.2 μm by a grinder in the length direction; petroleum ether was used 20 minutes before welding Degrease, and scrub the polished base metal with alcohol; then clamp and fix the HR-2 stainless steel plate and J75 stainless steel in the welding room by means of butt joint and tight fit, and keep the two base metals placed horizontally; close the vacuum welding room And pump the vacuu...

Embodiment 3

[0044] Embodiment 3: Vacuum electron beam welding of HR-2 stainless steel plate and J75 stainless steel plate of specification 220 (long) × 80 (wide) × 2.5mm (thick)

[0045] The difference from Example 1 is that the thickness of the welded J75 and HR-2 plates is both 2.5 mm, and the welding process parameters and the number of electron beam scanning after welding are adjusted accordingly.

[0046] The same heat-treated HR-2 stainless steel plate and J75 stainless steel plate blanks as in Example 1 were used, machined to a thickness of 2.5 mm after heat treatment, and processed to a roughness of Ra1.2 μm by a grinder in the length direction; petroleum ether was used 10 minutes before welding Degrease, and scrub the polished base metal with alcohol; then clamp and fix the HR-2 stainless steel plate and J75 stainless steel in the welding room by means of butt joint and tight fit, and keep the two base metals placed horizontally; close the vacuum welding room And pump the vacuum ...

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Abstract

The invention relates to the field of heterogeneous steel welding, in particular to a vacuum electron beam welding method for single-phase austenitic stainless steel (HR-2) and precipitation strengthening austenitic stainless steel (J75) heterogeneous plates (which have the thickness of between 2.0 and 5.0 millimeters). According to the vacuum electron beam welding method for the HR-2 and J75 stainless steel heterogeneous plates, a process comprises the following steps of: performing pre-welding treatment on parent metals, clamping and fixing in a vacuum welding chamber, vacuumizing the welding chamber, welding in a positioning mode, welding by using electron beams in a single circulation mode (the electron beams scan in a deflection mode) and scanning weld joints by using the electron beams in a defocusing mode after welding. According to HR-2 and J75 heterogeneous metal joints, the defects of pores, entrainment and the like are overcome in the joints, and poor gama' areas are not formed in a welding molten pool and a heat affected zone on one side of J75 alloy. The joints of the HR-2 and J75 stainless steel heterogeneous plates welded by the method have good formed surfaces, the strength of the joints is higher than 680 to 700 MPa, and the strength factor of the HR-2 stainless steel can reach over 0.9.

Description

technical field [0001] The invention relates to the field of dissimilar steel welding, in particular to vacuum electron beam welding of single-phase austenitic stainless steel (HR-2) and precipitation-strengthened austenitic stainless steel (J75) heterogeneous plates (thickness 2.0-5.0mm) method. Background technique [0002] HR-2 is a single-phase austenitic stainless steel. In addition to the main elements Fe, Cr, Ni, and Mn, 0.2-0.34wt.% solid solution strengthening element N is added to the steel. The stainless steel is usually used in a solid solution state, and its yield strength (σ 0.2 ) ≥ 350 ~ 400MPa, tensile strength ≥ 650 ~ 700MPa, elongation ≥ 45 ~ 55%, reduction of area ≥ 60 ~ 70%. J75 is a precipitation-strengthened austenitic stainless steel, which is usually used in the aging state. In addition to the main elements Fe, Cr, Ni, and Mo, about 2wt.%Ti and about 0.3wt.%Al are added to the steel, which will precipitate during the aging process The strengthening...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K15/06
Inventor 赵明久戎利建闫德胜姜海昌刘树伟胡晓峰王本贤
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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