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Sulfuric acid corrosion-resistant pure austenitic stainless steel electrode with high nickel and copper content and low thermal crack sensitivity and preparation method

An austenitic stainless steel, crack-sensitive technology, applied in welding equipment, manufacturing tools, welding media, etc., can solve the problems of high price, structure and performance changes, etc., achieve high thermal crack resistance, excellent elongation, The effect of welding arc stabilization

Active Publication Date: 2021-06-29
ATLANTIC CHINA WELDING CONSUMABLES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, ENiCrMo-3 electrode is mostly used for Alloy20 alloy welding. The Ni element content of the welding material is higher than 50%, which is expensive, and the content of Ni, Cu, and Mo elements in the base metal and the deposited metal is quite different. Diffusion, microstructure and properties change. For this reason, a homogeneous welding consumable that matches the Alloy20 alloy composition is specially developed. The developed electrode deposited metal has excellent mechanical properties, strong thermal crack resistance, and excellent intergranular corrosion resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take 100kg of nickel-chromium-molybdenum-copper-iron alloy welding core, the composition of nickel-chromium-molybdenum-copper-iron alloy welding core is (wt%): C 0.03%, Mn2.35%, Si 0.25%, Cr 20.55%, Ni 34.02%, the sum of Nb and Ta 0.28%, Cu 3.58%, Mo 2.81%, S0.002%, P 0.002%, Sn 0.007%, Sb 0.004%, As 0.006%, and the balance is Fe and essential impurities.

[0043] Take the drug skin, the weight of each component in the drug skin is as follows: containing TiO 2 94wt% rutile powder 12kg; contains CaCO 3 98.50wt% marble powder 5.0kg; containing CaF 2 97.3wt% fluorite powder 1.5kg; containing SiO 2 55wt%, Al 2 o 3 3.6kg of 32.5wt% mica powder; containing SiO 2 60.8wt%, Al 2 o 3 15.2wt%, K 2 O+Na 2 O 19.6wt% potassium feldspar powder 2.8kg; Mn 99.5wt% electrolytic manganese 2.8kg; Nb 99.75wt% niobium powder 0.5kg; Cr 98wt% metal chromium powder 1.3kg; Mo 55wt% molybdenum Iron powder 0.35kg; containing Na 2 CO 3 98.5wt% soda ash 0.3kg; containing Na 2 O11.5wt% so...

Embodiment 2

[0047] The welding rod of this embodiment is all the same as that of Embodiment 1 except that the weight of each component in the coating is different.

[0048] In the present embodiment, the weight of each component in the medicine skin is as follows: containing TiO 2 94wt% rutile powder 8kg; containing CaCO 3 6.5kg of 98.50wt% marble powder; containing CaF 2 97.3wt% fluorite powder 3kg; containing SiO 2 55wt%, Al 2 o 3 3.6kg of 32.5wt% mica powder; containing SiO 2 60.8wt%, Al 2 o 3 15.2wt%, K 2 O+Na 2 O 19.6wt% potassium feldspar powder 2.5kg; Mn 99.5wt% electrolytic manganese 2.4kg; Nb 99.75wt% niobium powder 0.3kg; Cr 98wt% metal chromium powder 1.8kg; Mo 55wt% molybdenum Iron powder 0.45kg; containing Na 2 CO 3 98.5wt% soda ash 0.3kg; containing Na 2 O 11.5wt% sodium alginate 0.2kg;

[0049] The obtained sulfuric acid corrosion-resistant pure austenitic stainless steel electrode 2 with high nickel and copper content and low thermal crack sensitivity was sub...

Embodiment 3

[0051] The welding rod of this embodiment is all the same as that of Embodiment 1 except that the weight of each component in the coating is different.

[0052] In the present embodiment, the weight of each component in the medicine skin is as follows: containing TiO 2 94wt% rutile powder 8kg; containing CaCO 3 7kg of 98.50wt% marble powder; containing CaF 2 97.3wt% fluorite powder 3kg; containing SiO 2 55wt%, Al 2 o 3 32.5wt% mica powder 2.0kg; containing SiO 2 60.8wt%, Al 2 o 3 15.2wt%, K 2 O+Na 2 O 19.6wt% potassium feldspar powder 2.2kg; Mn99.5wt% electrolytic manganese 2.8kg; Nb 99.75wt% niobium powder 0.3kg; Cr 98wt% metal chromium powder 1.8kg; Mo 55wt% molybdenum Iron powder 0.55kg; containing Na 2 CO 3 98.5wt% soda ash 0.3kg; containing Na 2 O 11.5wt% sodium alginate 0.2kg;

[0053] The resulting sulfuric acid corrosion-resistant pure austenitic stainless steel electrode 3 with high nickel and copper content and low thermal crack sensitivity was subjecte...

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PUM

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Abstract

The invention discloses a sulfuric acid corrosion-resistant pure austenitic stainless steel electrode with high nickel and copper content and low thermal crack sensitivity, which is composed of a nickel-chromium-molybdenum-copper-iron alloy welding core and a coating covering the surface of the welding core. The content is: 7-13 parts by weight of rutile powder, 4-8 parts by weight of marble powder, 1.0-4.0 parts by weight of fluorite powder, 1.5-4.0 parts by weight of mica powder, 1.5-3.0 parts by weight of potassium feldspar powder, 2-3 parts by weight of electrolytic manganese parts by weight, 0.25-0.6 parts by weight of niobium powder, 1.0-2.0 parts by weight of metallic chromium powder, 0.2-0.6 parts by weight of ferromolybdenum powder, 0.1-0.5 parts by weight of soda ash and 0.1-0.5 parts by weight of sodium alginate. Compared with the existing ones, the electrode deposited metal of the invention has excellent mechanical properties, strong thermal crack resistance and excellent intergranular corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a sulfuric acid corrosion-resistant pure austenitic stainless steel electrode with high nickel and copper content and low heat crack sensitivity and a production method thereof. Background technique [0002] The regenerated flue gas produced by the catalytic cracking unit in the refinery contains a large amount of sulfur dioxide (SO2), nitrogen oxides (NOx) and catalyst dust. An effective way to reduce flue gas SO2, NOx and catalyst dust emissions is to use flue gas desulfurization and denitrification technology. Flue gas scrubber is the key equipment of this technology. The inlet temperature of the flue gas scrubber is about 200°C. The high-temperature flue gas combines with quenched atomized water to form sulfuric acid and nitric acid. The dry-wet interface that is most prone to acid corrosion at the inlet section of the scrubber and the flue gas distribut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362B23K35/22B23K35/40
CPCB23K35/22B23K35/362B23K35/40
Inventor 徐晓龙刘奇望袁宁李欣雨明廷泽蒋勇范银东张洁
Owner ATLANTIC CHINA WELDING CONSUMABLES
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