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Low-strength high-toughness and heat-resistant steel welding rod

A high-toughness, low-strength technology, applied in the direction of welding media, welding equipment, welding/welding/cutting items, etc., can solve the problems of large differences in fields and unsatisfactory mechanical properties, and achieve smooth surface, stable mechanical properties, and stable combustion Effect

Inactive Publication Date: 2014-06-25
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrode proposed in this patent is mainly suitable for the welding of steel plates with a tensile strength above 800MPa, but not for the welding of 15CrMoR steel plates (the composition and mechanical properties of the electrode developed by patent CN1569386A do not meet the requirements of welding materials for 15CrMoR steel plates)
The above-mentioned patents are all used for the welding of some specific heat treatment states and specific steel types, which are quite different from the fields of application of the patent of the present invention

Method used

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  • Low-strength high-toughness and heat-resistant steel welding rod

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Embodiment Construction

[0025] The present invention can be explained in detail through the following examples, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0026] The specific composition of electrode coating composition is shown in Table 1.

[0027] Table 1 Example composition ratio (wt%)

[0028]

[0029]

[0030] The chemical composition requirements of the main raw materials of the examples are shown in Table 2.

[0031] The chemical composition of the main raw material of table 2 embodiment

[0032]

[0033]

[0034] Examples The chemical composition of the deposited metal is shown in Table 3.

[0035] Table 3 Example welding wire and deposited metal chemical composition (wt%)

[0036]

[0037] Embodiment performance comparison is as shown in table 4.

[0038] Table 4. Mechanical properties of the deposited metal in the example (675°C×3h heat treatment)

[0039]

[0040] This pate...

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Abstract

A low-strength high-toughness and heat-resistant steel welding rod comprises an H08E welding core and a coating. The coating is prepared by components including, by weight, 35-43% of marbles, 16-20% of fluorite, 3-5% of imported rutile, 1-2% of sodium carbonate, 2-4% of atomized ferrosilicon, 1-3% of flogopite, 3-5% of mid-carbon ferromanganese, 2.5-3% of Cr, 1.0-1.5% of molybdenum, 2-3% of ferrotitanium, 1-3% of silica powder, 1-2% of rare earth ferrosilicon and 17-21% of pure sodium silicate. After subjected to heat treatment at the temperature ranging from 675 + / -10 DEG C for 3 hours, the deposited metal is stable in mechanical property, low in strength (with room temperature tensile of 510-540Mpa), good in charpy impact absorbing energy at minus 20 DEG C is 180J above) and good in production process performance; the steel welding rod is smooth in surface, stable in eccentricity and high in yield.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a low-strength and high-toughness heat-resistant steel welding rod. Background technique [0002] It is known that 15CrMoR steel plate is widely used in petrochemical, coal chemical, nuclear power, steam turbine cylinder, thermal power and other fields, but its use conditions are harsh, and the requirements for matching electrodes are also high. However, such electrodes generally have the problem that low-temperature impact toughness and strength cannot be guaranteed at the same time, which brings a lot of trouble to the construction of pressure-bearing equipment. At present, there are not many patents related to heat-resistant steel electrodes at home and abroad. The retrieved patents are: (1) A heat-resistant steel electrode capable of annealing and normalizing treatment and its use method (publication number: CN101342650A). The electrode and usage method proposed in...

Claims

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Application Information

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IPC IPC(8): B23K35/365B23K35/24
CPCB23K35/0272B23K35/3602B23K2103/04
Inventor 王青云亢天佑刘宏
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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