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Submerged arc sintering flux for stainless steel at low temperature

A technology of sintered flux and submerged arc welding, which is applied in the field of submerged arc welding of stainless steel and medium and heavy plate welding, and can solve the problems of poor low temperature toughness and poor welding process performance.

Active Publication Date: 2021-01-26
BEIJING JINWEI WELDING MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the shortcomings of the existing stainless steel submerged arc flux welding process performance at low temperature and poor low temperature toughness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] a) The proportion of ingredients in the dry powder part of the flux:

[0068] 27 parts by weight of dry ground fluorite, 22 parts by weight of white corundum, 25 parts by weight of sintered magnesia, 23 parts by weight of wollastonite, and 3 parts by weight of alloy powder;

[0069] Alloy powder: nickel 25% chromium 56% alloy powder;

[0070]The binder water glass accounts for 22% of the dry powder weight, the potassium-sodium ratio is 1:1, 43.2°Bé (20°C), and the modulus is 3.3.

[0071] b) Flux alkalinity: 2

[0072] c) Preparation method: mix the dry powder materials in the proportion of ingredients evenly, add water glass, carry out wet mixing, and then carry out granulation, and then dry at a low temperature of 200-330 ° C for 30-50 min, sieve, and then at 700-800 ° C. Sintered at high temperature for 45-60min, then cooled and sieved to get it. The specific preparation method is: sieve the required raw materials and weigh according to the formula. After re-check...

Embodiment 11

[0081] CN102581518A (Chinese Patent Application No. 2012100794134, Jinwei) Specification [0153] Table 1 discloses 6 kinds of flux formulations of S1~S6, wherein the amount of white corundum used is obviously lower than that of the present invention, and the amount of wollastonite is obviously lower than that of the present invention High, the alloy powder used is nickel alloy powder.

[0082] In this Example 11, the inventors used six kinds of flux formulations of S1 to S6 of CN102581518A, CaF 2 With dry grinding fluorite, Al 2 O 3 White corundum, sintered magnesia for MgO, CaO and SiO 2 The addition amount is changed to Example 1 of the present invention with wollastonite and alloy powder, and the other conditions refer to the formula and preparation method of Example 1 of the present invention, and 6 kinds of fluxes are obtained according to the "d) performance investigation" of Example 1 of the present invention. ER308L welding wire was investigated, the results of 6 flu...

Embodiment 12

[0085] Table 1 of Example 1 of CN108057964A (Chinese Patent Application No.: 201711323063.0, Jinwei) discloses five flux formulations from N1 to N5, in which the amount of fluorite used is obviously higher than that of the present invention, and fluorine aluminum is also used Potassium acid, the alloy powder used is ferroniobium alloy powder.

[0086] In this Example 12, the inventor used five flux formulations from N1 to N5 of CN108057964A, the alloy powder was changed to Example 1 of the present invention, and the remaining conditions were referred to the formula and preparation method of Example 1 of the present invention, and five kinds of fluxes were obtained. The flux is investigated according to the "d) performance investigation" in Example 1 of the present invention, and the ER308L welding wire is used for investigation. The results of the five fluxes are as follows:

[0087] Tensile strength (R m / Mpa) in the range of 470-510, elongation (A / %) in the range of 32-36, ...

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Abstract

The invention relates to a low-temperature submerged arc sintering flux for stainless steel, which is prepared from dry powder of various components and binder water glass, and is characterized in that the weight ratio of each component in the dry powder is: 15-30 parts by weight of limestone, 15-30 parts by weight of white corundum, 20-35 parts by weight of magnesia, 10-25 parts by weight of wollastonite, and 1-5 parts by weight of alloy powder. The flux is prepared according to the following steps: mix the dry powder materials in the proportion of ingredients evenly, add water glass, carry out wet mixing, then carry out granulation, and then dry at 200-330 ° C for 30-50 minutes, and sieve , and then sintered at a high temperature of 700-800°C for 45-60min, and then cooled and sieved. The flux of the present invention exhibits excellent effects as described in the specification.

Description

technical field [0001] The invention relates to a submerged arc sintering flux for stainless steel at low temperature, which is mainly suitable for submerged arc welding of stainless steel, and is especially suitable for medium and thick plate welding in petrochemical, nuclear power and other industries. Background technique [0002] With the development of modern industry and the improvement of automation level, stainless steel submerged arc automatic welding has been widely used in petrochemical, nuclear power and other industries because of its high degree of automation, fast welding speed, and good welding performance. At present, during the welding of medium and thick plates, ordinary fluxes have poor process performance such as forming and slag removal, large burning loss of alloy elements, poor toughness at -196 °C, and corrosion resistance that cannot meet the needs of high-end users. Therefore, its supporting The performance of the welding material is particularly i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/36
CPCB23K35/3605
Inventor 崔晓东王士山李伟王学东朱海滨陈亮白建斌王立志王磊
Owner BEIJING JINWEI WELDING MATERIAL
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