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High-toughness welding electrode matched with 14Cr1MoR for hydrogen steel

A 14cr1mor, hydrogen-in-steel technology, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problems of temper embrittlement, decreased toughness, etc., and achieve improved mechanical properties, arc stability, and reasonable control. Effect

Active Publication Date: 2021-08-13
SICHUAN XIYE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1.25Cr~0.5Mo steel belongs to the heat-strength steel with ferrite-pearlite structure, which has high heat strength and oxidation resistance at high temperature, but temper embrittlement will occur if it works for a long time in the temperature range of 375~575°C and reduced toughness

Method used

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  • High-toughness welding electrode matched with 14Cr1MoR for hydrogen steel
  • High-toughness welding electrode matched with 14Cr1MoR for hydrogen steel
  • High-toughness welding electrode matched with 14Cr1MoR for hydrogen steel

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preparation example Construction

[0054] Second, the present invention provides a preparation method for the supporting high-toughness welding rod of heat-strength steel 14Cr1MoR for hydrogen-facing steel, comprising the following steps,

[0055] S1 Mix the skin powder evenly;

[0056] S2 Add water glass accounting for 21-23wt.% of the powder component mass content, and carry out wet mixing, wherein the potassium-sodium ratio of water glass is 1:1, and the Baume concentration is 41-43Be;

[0057] In S3, the mixture obtained in S2 is loaded on the welding core on a hydraulic welding rod machine to produce a welding rod.

[0058] The 3rd, the present invention provides the welding method of the supporting high-toughness electric welding rod of heat-strength steel 14Cr1MoR that faces hydrogen steel, comprises the following steps:

[0059] Preheat the test plate to 200~250°C before welding, dry the electrode at 380°C for no less than 1 hour before welding, keep warm at 150°C, and use it at any time. During the we...

Embodiment 1-6

[0062] The heat-strength steel 14Cr1MoR for hydrogen steel is matched with high-toughness welding electrodes, including the welding core and the coating covering the surface of the welding core. The components of the coating are shown in Table 1.

[0063] The chemical composition of the solder core is shown in Table 2.

[0064] The preparation method is as follows: After mixing the ingredients of the drug skin evenly, adding water glass with a potassium-sodium ratio of 1:1 at 20°C (Baume density is 41-43Be) accounting for 21-23 wt.% of the drug skin weight. Stir evenly, send it into a hydraulic machine to wrap it on the surface of the welding core, and form the welding rod of the present invention after baking at a low temperature of 80°C and at a high temperature of 380°C.

[0065] In Examples 1-6, the mass ratio of coating and welding core is 3:7.

[0066] The welding method is as follows: preheat the test plate to 200~250°C before welding, dry the electrode at 380°C for no...

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Abstract

The invention relates to the technical field of welding materials, and discloses a high-toughness welding electrode matched with 14Cr1MoR for hydrogen steel. The high-toughness welding electrode comprises a core wire and a coating, the core wire adopts H08E steel, and components of the coating comprise, by weight percent, 35.0%-39.0% of carbonate, 23.5%-26.0% of fluoride, 5.0%-8.0% of rutile, 4.0%-8.0% of silicon dioxide, 3.0%-5.0% of ferromanganese, 6.2%-7.2% of ferrosilicon, 2.0%-3.0% of ferrotitanium, 3.0%-5.0% of chromium metal, 2.0%-4.0% of ferromolybdenum, 1.0%-2.0% of rare earth, 5.0%-10.0% of reduced iron powder, 0.6%-1.0% of CMC and 1.0%-2.0% of a binder. After the welding electrode is subjected to 690 DEG C*20 h heat treatment, the mechanical property at the normal temperature and the high temperature (380 DEG C, 450 DEG C and 510 DEG C) is good, the impact absorption energy at the temperature of -20 DEG C is larger than or equal to 100 J, the contents of deposited metal As, Sn and Sb are all smaller than 0.005%, the X coefficient is smaller than 15 ppm, and the welding requirement of the 14Cr1MoR for the hydrogen steel is met.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a 14Cr1MoR matching high-toughness welding electrode for hydrogen-facing steel. Background technique [0002] With the rapid development of my country's petroleum and chemical industries, pressure-bearing equipment is also developing in the direction of large-scale, lightweight, high-parameter, and long-life. It is especially critical to determine the ultimate performance of the pressure equipment. [0003] 1.25Cr~0.5Mo steel belongs to the heat-strength steel with ferrite-pearlite structure, which has high heat strength and oxidation resistance at high temperature, but temper embrittlement will occur if it works for a long time in the temperature range of 375~575°C and reduced toughness. In recent years, major steel mills have greatly improved the performance of domestic steel by controlling the content of impurity elements P, As, Sn, and Sb, and can repla...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/365
CPCB23K35/0272B23K35/3073B23K35/3602B23K35/365
Inventor 康丹丹
Owner SICHUAN XIYE NEW MATERIAL
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