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Welding material for ZG30Cr25Ni20

A welding material and welding process technology, applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve problems such as unsatisfactory high-temperature mechanical properties of welds, hidden dangers in stability and safety, and achieve superior synergy The effect of function, high temperature mechanical properties, and excellent corrosion resistance

Inactive Publication Date: 2018-08-28
李泳澎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is found in the application that the high temperature mechanical properties of the weld are not ideal
This defect makes the stability and safety of ZG30Cr25Ni20 products in high-temperature application environments hidden dangers, thus limiting the application of ZG30Cr25Ni20 products in certain high-temperature environments that require mechanical properties

Method used

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  • Welding material for ZG30Cr25Ni20
  • Welding material for ZG30Cr25Ni20

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Two nickel-based rolled plates with specifications of 450mm×75mm×20mm were selected as welding samples, and a V-shaped butt groove was adopted. The groove type was: the length of the blunt side was 1mm, and the groove angle was 60°.

[0020] The above-mentioned welding samples were welded by GTAW welding process; the welding machine model used was WSM-4000 inverter pulse argon arc welding machine; the welding material used was welding wire with a diameter of φ2.4mm, and its composition was: C 0.03% , Cr 16.8%, Fe7.2%, Mn 0.4%, Nb 2.45%, Si 0.85%, S 0.002%, P 0.002%, Ni balance.

[0021] The connection mode between the welding machine and the welding sample is direct current connection. The welding process includes the following steps:

[0022] (1) Clean the groove surface of the sample to be welded, keep it clean and dry, then connect the groove according to the above-mentioned V-shaped butt joint method, fix the position by spot welding, and then pass argon gas for pr...

Embodiment 2

[0026] Two nickel-based pipe sections with specifications of φ120mm (outer diameter) × 15mm (wall thickness) × 150mm (length) were selected as welding samples, and U-shaped butt joint grooves were adopted. The groove form was blunt edge length 1mm, radius 4mm, Groove angle 25°.

[0027] Using the same welding consumables, equipment and welding process as in Example 1, the above welding samples were welded. The connection mode between the welding machine and the welding sample is direct current connection.

[0028] The welding process includes the following steps:

[0029] (1) Clean the groove surface of the sample to be welded, keep it clean and dry, then connect the groove according to the above U-shaped butt joint method, fix the position by spot welding, and then pass argon gas for protection;

[0030] (2) Carry out bottom welding on the welding sample, the welding current is 90A, the voltage is 12V, the welding speed is about 0.8mm / s, and two layers are welded;

[0031]...

Embodiment 3

[0032] Embodiment 3 (comparison)

[0033] The welding material in Example 1 was changed to ERNiCr-3 welding wire with a diameter of φ2.4mm, and other conditions remained unchanged.

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Abstract

The invention discloses a welding material for ZG30Cr25Ni20 and relates to the field of welding materials. The welding material comprises the following chemical components in percentage by mass: equalto or less than 0.5% of C, 16.0-18.0% of Cr, 6.0-10.0% of Fe, equal to or less than 1.0% of Mn, 1.5-3.0% of Nb, 0.6-1.0% of Si, equal to or less than 0.015% of S, equal to or less than 0.015% of P and equal to or greater than 70.0% of Ni. A welding seam obtained from the welding material is excellent in surface topography, has excellent corrosion resistance, normal temperature mechanical propertyand remarkably improved high temperature mechanical property and can greatly improve the quality and service life of a product.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a welding material used for ZG30Cr25Ni20. Background technique [0002] The high temperature resistant casting alloy ZG30Cr25Ni20 has the following chemical composition (mass percentage): C0.25~0.35%, Cr 23.0~27.0%, Ni 18.0~22.0%, Mn≤1.0~1.5%, Mo≤0.5%, Si0.5~ 2.0%, S≤0.03%, P≤0.03%, Fe balance. The alloy has excellent high temperature corrosion resistance, oxidation resistance and cold and hot processing properties, and is widely used in the petrochemical field. [0003] The application of alloys is inseparable from welding, and the quality of welds is an important factor affecting the overall performance of metal products (such as mechanical properties and corrosion resistance). If the welding material is improperly selected or of poor quality, the weld will become the "short board" of the overall performance of the product. Complementary welding consuma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30
CPCB23K35/3033
Inventor 李泳澎
Owner 李泳澎
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