Low-alloy steel covered arc welding electrode with Cr control capacity and FAC resisting capacity of weld metal of basic slag system

A low-alloy steel and weld metal technology, which is applied in the field of low-alloy steel electrodes, can solve the problems of composition and performance development of welding materials, etc., and achieve the effects of excellent welding process performance, good slag removal and stable arc

Inactive Publication Date: 2012-09-12
POWERCHINA SPEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no welding materials specially developed for its composition and performance at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095]The composition and mass percentage of the drug skin are as follows: marble: 35%, fluorite: 15%, quartz 4%, natural rutile 4%, iron powder: 30%, metal manganese: 4%, ferrosilicon: 4% , Ferrochromium: 1%, Ferromolybdenum: 1%, Nickel: 2%.

[0096] After mixing the raw materials of the above drug coating evenly, use a 40-mesh sieve to sieve it to below 40 mesh. After the dry powder is stirred evenly, add pure sodium water glass accounting for 20% of the mass content of the solid component, and after stirring evenly, pass through the conventional welding rod production equipment. It is pressure-coated on the above-mentioned welding core to prepare welding rod. The produced welding rod has smooth surface, high yield and no eccentricity. The chemical composition of the deposited metal of the electrode was detected: C: 0.058%, Mn: 1.61%, Si: 0.32%, Cr: 0.25%, Ni: 0.98%, Mo: 0.29%, S: 0.006%, P: 0.010% , Ti≤0.007%.

[0097] Mechanical properties at room temperature R m : 715...

Embodiment 2

[0099] The mass fraction of each component of the coating is as follows: marble: 30%, fluorite: 20%, quartz 4%, natural rutile 4%, iron powder: 30%, metal manganese: 4%, ferrosilicon: 4%, ferrochrome : 1%, ferromolybdenum: 1%, nickel: 2%.

[0100] The preparation method of the welding rod is the same as that of Example 1, and the produced welding rod has smooth surface, high yield and no eccentricity. The chemical composition of the deposited metal of the electrode was detected to be C: 0.052%, Mn: 1.51%, Si: 0.31%, Cr: 0.26%, Ni: 1.04%, Mo: 0.29%, S: 0.005%, P: 0.010%, Ti≤0.007%.

[0101] Mechanical properties at room temperature R m : 680MPa, R e1 : 570MPa; -50℃ average KV 2 : 80J.

Embodiment 3

[0103] The mass fraction of each component of the coating is as follows: marble: 25%, fluorite: 25%, quartz 4%, natural rutile 4%, iron powder: 30%, metal manganese: 4%, ferrosilicon: 3%, ferrochrome : 2%, ferromolybdenum: 1%, nickel: 2%.

[0104] The preparation method of the welding rod is the same as that of Example 1, and the produced welding rod has smooth surface, high yield and no eccentricity. The chemical composition of the deposited metal of the electrode was detected to be C: 0.057%, Mn: 1.54%, Si: 0.39%, Cr: 0.28%, Ni: 0.96%, Mo: 0.30%, S: 0.008%, P: 0.010%, Ti≤0.007%.

[0105] Mechanical properties at room temperature R m : 720MPa, R e1 : 575MPa; -50℃ average KV 2 : 66J.

[0106] The chemical composition of deposited metal of a similar electrode imported from abroad: C: 0.056%, Mn: 1.48%, Si: 0.31%, Cr: 0.04%, Ni: 0.76%, Mo: 0.38%, S: 0.007%, P: 0.008% , Ti≤0.007%.

[0107] Mechanical properties at room temperature R m : 635MPa, R e1 : 525MPa; -50℃ averag...

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PUM

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Abstract

The invention relates to a low-alloy steel covered arc welding electrode with Cr control capacity and FAC resisting capacity of a weld metal of a basic slag system. The low-alloy steel covered arc welding electrode comprises a core wire and a coating, wherein the core wire comprises the following components in percent by mass: 0-0.10 percent of C, 1.00-1.60 percent of Mn, 0-0.50 percent of Si, 0.15-0.35 percent of Cr, 0.60-1.20 percent of Ni, 0.15-0.35 percent of Mo, 0-0.007 percent of Ti, 0-0.010 percent of S and 0-0.015 percent of P. The low-alloy steel covered arc welding electrode has better welding process property in a welding process; and a weld has properties such as better strength, impact flexibility and FAC resistance.

Description

technical field [0001] The invention relates to a welding material, in particular to a low-alloy steel welding rod which is used for basic slag-based weld metals of WB36CN1 steel for nuclear power pipelines to control Cr and have FAC resistance. Background technique [0002] With the rapid development of my country's electric power industry, nuclear power plants have become an important part of electric power development due to their advantages of high efficiency, economy, and cleanliness. However, the steel and welding materials used in nuclear power construction have been dependent on imports for a long time, which seriously restricts the development of my country's nuclear power industry. For this reason, when designing the conventional island of the Ling Ao Phase II nuclear power plant, the subject of steel localization was proposed. At present, the steel materials suitable for the main steam and main water supply pipes of nuclear power conventional islands have been ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/365B23K35/40
Inventor 陆伟康吴峥邱执中王尧俊杨光磊仇陆弟
Owner POWERCHINA SPEM CO LTD
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