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Welding technology for bainite heat-resistant steel 12Cr2MoWVTiB

A welding process and technology of heat-resistant steel, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems that the evaluation standard cannot be fully met, tensile strength, yield strength and elongation cannot be achieved.

Inactive Publication Date: 2015-09-02
唐山市鑫铭机械设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to the standard of NB / T47014 "Welding Process Evaluation of Pressure Equipment", the welding process evaluation of 12Cr2MoWVTiB steel is carried out, and the tensile strength, yield strength, bending performance and elongation of the welded joints are measured, and the evaluation standards and parent materials cannot be fully met. The requirements of the material, especially in the three aspects of tensile strength, yield strength and elongation are still far from meeting the requirements of the base material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Welding and heat treatment parameters:

[0027] The base metal preheating temperature is 150°C;

[0028] In terms of mass percentage, the chemical composition of metal welding wire is: C is 0.09%, Mn is 0.80%, Si is 0.50%, S is 0.02%, P is 0.02%, Cr is 1.80%, Mo is 0.60%, V is 0.35 %, W is 0.30%, B is 0.004%, Cu is 0.30%, and the rest is Fe;

[0029] Welding heat input: 16.0 kJ / cm;

[0030] Welding current: 150A, voltage: 12V; welding speed: 9cm / min;

[0031] Weld thickness: 3.5mm, interlayer temperature: 250°C;

[0032] Post-weld heat treatment process: heating rate: 180°C / h; cooling rate: 220°C / h, holding temperature: 765±5°C, holding: 120min, cooling to 400°C and then air cooling.

[0033] Post-weld performance test results: the tensile strength is 650-660MPa, the yield strength of the weld is 480-495MPa, the reduction of area is 24%-25%, and the bending performance: there is no cracking in any direction on the bending surface, The weld structure is tempered bai...

Embodiment 2

[0035] Welding and heat treatment parameters:

[0036] Preheating temperature: 170°C;

[0037] The chemical composition of metal welding wire, in terms of mass percentage: C is 0.06%, Mn is 0.92%, Si is 0.54%, S is 0.023%, P is 0.019%, Cr is 2.06%, Mo is 0.55%, V is 0.42% , W is 0.42%, B is 0.003%, Cu is 0.25%, and the rest is Fe.

[0038] The welding heat input is controlled within the range of 18.9 kJ / cm.

[0039] Welding current: 170 A, voltage: 13V; welding speed: 8.5cm / min.

[0040] The thickness of each weld seam is controlled at 2.5mm; the interlayer temperature is controlled at 200°C.

[0041] Post-weld heat treatment process: heating rate: 200°C / h; cooling rate: 200°C / h holding temperature: 765±5°C, holding: 120min, cooling to 400°C and then air cooling.

[0042] Post-weld performance test results: the tensile strength is 658-668MPa, the yield strength of the weld is 478-485MPa, the reduction of area is 23%-26%, and the bending performance: there is no cracking in...

Embodiment 3

[0044] Welding and heat treatment parameters:

[0045] Preheating temperature: 200°C;

[0046] The chemical composition of metal welding wire, in terms of mass percentage: C is 0.10%, Mn is 0.75%, Si is 0.63%, S is 0.025%, P is ≤0.017%, Cr is 2.10%, Mo is 0.66%, V is 0.28 %, W is 0.47%, B is 0.005%, Cu is 0.20%, and the rest is Fe.

[0047] The welding heat input is controlled within the range of 14.0kJ / cm.

[0048] When performing welding, applied welding current: 180A, voltage: 14V; welding speed: 8cm / min.

[0049] The thickness of each weld seam is controlled at 4mm; the interlayer temperature is controlled at 300°C.

[0050] Post-weld heat treatment process: heating rate: 190°C / h; cooling rate: 210°C / h heat preservation temperature: 765±5°C, heat preservation: 120min, after cooling to 400°C, it is air-cooled

[0051] Post-weld performance test results: the tensile strength is 640-650MPa, the yield strength of the weld is 490-495MPa, the reduction of area is 28%-29%, an...

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Abstract

The invention relates to a welding technology for bainite heat-resistant steel 12Cr2MoWVTiB. The welding technology comprises the following steps: preheating the base metal of the bainite heat-resistant steel 12Cr2MoWVTiB before welding; selecting a metal welding wire of which the chemical components and the mechanical property are matched with those of the base metal; conducting welding on the base metal in a multi-channel / layer welding manner, controlling the heat input for welding, and controlling the weld thickness of each welding layer and the inter-layer temperature; after welding, carrying out air cooling till the room temperature is reached, and then carrying out post-welding heat treatment. Through the adoption of the welding technology, the weld property can be improved to the greatest extent, and the welding technology assessment requirements can be completely met; the tensile strength and the yield strength of a weld part are 660 MPa and 495 MPa respectively, and the reduction of area is 25%; no crack is formed in a curved surface in any direction; a weld structure is a tempered bainite structure; the property of the base metal is satisfied in such three aspects as tensile strength, yield strength and elongation.

Description

technical field [0001] The invention relates to a welding process, in particular to a welding process of bainitic heat-resistant steel 12Cr2MoWVTiB. Background technique [0002] With the development of thermal power units in the direction of high parameters and large capacity, some new bainite, martensite and austenite heat-resistant steels have been developed for this purpose. These steels are multi-component strengthened by a variety of trace elements, so the content of alloy elements in these steels is relatively high, the carbon equivalent is relatively high, and the welding performance is relatively reduced. For T91 and T92 steels, my country mainly relies on imports, while 12Cr2MoWVTiB steel is a steel grade developed and produced by my country that can be used in high-parameter and large-capacity units. [0003] According to the standard of NB / T47014 "Welding Process Evaluation of Pressure Equipment", the welding process evaluation of 12Cr2MoWVTiB steel is carri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02B23K35/30
CPCB23K31/02B23K35/3073B23K2103/04
Inventor 杨会静
Owner 唐山市鑫铭机械设备有限公司
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