Formula of low-alloy electrode for -50 DEG C spherical tank made of 07MnNiMoDR steel and production process thereof

A production process, low-alloy technology, applied in the direction of manufacturing tools, metal processing equipment, welding media, etc., can solve the problems affecting the construction progress, long procurement cycle, foreign exchange consumption, etc., to achieve excellent comprehensive performance and low sensitivity to cold cracks , Good effect of welding process performance

Inactive Publication Date: 2020-04-10
HUBEI POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, the -50°C 07MnNiMoDR ​​steel plate used in the construction of large-scale ethylene, propylene and other spherical tanks has been localized, but its matching welding materials still rely on imports, which have long been monopolized by Japan's Kobelco and Nippon Steel Corporation, using LB-62L, LB -65L and L-60LT have caused domestic ethylene and other spherical tank construction electrodes to be controlled by others for a long time. Not only the price is high, a large amount of foreign exchange is consumed, but also the procurement cycle is long, which affects the construction progress.

Method used

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  • Formula of low-alloy electrode for -50 DEG C spherical tank made of 07MnNiMoDR steel and production process thereof
  • Formula of low-alloy electrode for -50 DEG C spherical tank made of 07MnNiMoDR steel and production process thereof
  • Formula of low-alloy electrode for -50 DEG C spherical tank made of 07MnNiMoDR steel and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A formula of low-alloy electrode for 07MnNiMoDR ​​steel-50℃ spherical tank, including welding core and coating, the mass percentage of its chemical composition is: C: 0.067%, Mn: 0.86%, Si: 0.15%, Mo: 0.29 %, Ni: 2.35%, S: 0.006%, P: 0.005%, the balance is Fe, and other unavoidable impurity elements.

[0033] Table 1 Deposit metal chemical composition %

[0034] Numbering C mn Si Mo Ni S P Required value ≤0.10 ≤1.35 ≤0.60 0.10～0.30 2.0～2.75 ≤0.010 ≤0.012 measured value 0.067 0.86 0.15 0.29 2.35 0.006 0.005

[0035] Table 2 Formulation 1 Deposited Metal Mechanical Properties (620℃×1h)

[0036]

[0037] Note: preheating and interlayer temperature: 100°C voltage 25V

[0038] Table 3 Water content and diffusible hydrogen of drug skin

[0039]

[0040] In the above embodiment, more specifically, the diameter of the low alloy electrode is 1.5 mm.

[0041] In the above embodiments, more specifically, the welding core is...

Embodiment 2

[0046] A formula of low-alloy welding rod for 07MnNiMoDR ​​steel-50℃ spherical tank, including welding core and coating, the mass percentage of its chemical composition is: C: 0.03-0.08%, Mn: 0.5-1.2%, Si: 0.1- 0.5%, Mo: 0.12-0.30%, Ni: 2.1-2.6%, S: 0.001-0.009%, P: 0.001-0.009%, the balance is Fe, and other unavoidable impurity elements.

[0047] Table 4 Formulation 2 Deposited Metal Chemical Composition %

[0048]

[0049] Table 5 Formula 2 Deposited Metal Mechanical Properties (620℃×1h)

[0050]

[0051] Note: Preheating and interlayer temperature: 100°C voltage 25V, X-ray flaw detection I

[0052] In the above embodiment, more specifically, the diameter of the low-alloy electrode is 2mm.

[0053] In the above embodiment, more specifically, the welding core is made of carbon steel.

[0054] In the above embodiment, more specifically, the thickness of the coating is 200% of the diameter of the welding core.

[0055] In the above embodiment, more specifically, the m...

Embodiment 3

[0058] A formula of low-alloy welding rod for 07MnNiMoDR ​​steel-50℃ spherical tank, including welding core and welding rod, the mass percentage of its chemical composition is: C: 0.03-0.08%, Mn: 0.5-1.2%, Si: 0.1-0.5 %, Mo: 0.12-0.30%, Ni: 2.1-2.6%, S: 0.001-0.009%, P: 0.001-0.009%, the balance is Fe, and other unavoidable impurity elements.

[0059] Table 6 Chemical composition of deposited metal %

[0060]

[0061] Table 7 Mechanical Properties of Electrode Deposited Metal (620℃×1h)

[0062]

[0063] Note: preheating and interlayer temperature: 100°C voltage 25V

[0064] In the above embodiment, more specifically, the diameter of the low-alloy electrode is 2.5 mm.

[0065] In the above embodiments, more specifically, the welding core is made of alloy steel.

[0066] In the above embodiment, more specifically, the thickness of the coating is 100% of the diameter of the welding core.

[0067] In the above embodiment, more specifically, the mass of the coating is 25% o...

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Abstract

The invention provides a formula of a low-alloy electrode for a -50 DEG C spherical tank made of 07MnNiMoDR steel. The formula includes a core wire and a coating. The electrode includes the chemical components of, by mass, 0.03-0.08% of C, 0.5-1.2% of Mn, 0.1-0.5% of Si, 0.12-0.30% of Mo, 2.1-2.6% of Ni, 0.001-0.09% of S, 0.001-0.009% of P, and the balance Fe. The electrode with the formula has ahigh and stable toughness index. The electrode has high bonding performance in welding with 07MnNiMoDR steel plates, and the cold crack sensitivity of weld metal is low. The low-alloy electrode is suitable for large-heat-input welding, and excellent comprehensive performance can still be obtained when the heat input is 40.2 KJ/cm. The welding heat input can be controlled to be 40 KJ/cm or below, and the interpass temperature can be controlled to be 100-170 DEG C.

Description

technical field [0001] The invention relates to the field of spherical containers, in particular to a formula and a production process of a low-alloy welding rod for 07MnNiMoDR ​​steel -50°C spherical tanks. Background technique [0002] Spherical containers are widely used in petroleum, chemical industry, metallurgy, city gas, light industry, aerospace and nuclear energy industries to store liquefied petroleum gas ( LPG), liquefied natural gas (LNG) ethylene, propylene, propane, butane, liquid ammonia, liquid oxygen and other liquefied gases and oxygen, nitrogen, nuclear gas, natural gas and city gas, etc. With the rapid development of my country's petroleum, chemical industry and steel material industry, especially the technological progress of spherical tank construction technology, the construction of spherical vessels presents a trend of high pressure and large-scale development. [0003] In recent years, the -50°C 07MnNiMoDR ​​steel plate used in the construction of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3053B23K35/40
Inventor 王向杰徐绍勇查吉利
Owner HUBEI POLYTECHNIC UNIV
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