Welding wire for submerged-arc welding of high-efficiency X100 pipeline steel and application of welding wire

A pipeline steel, submerged arc welding technology, applied in the direction of application, arc welding equipment, welding medium, etc., to achieve the effect of improving electrical conductivity, increasing strength, and easy realization of welding wire drawing process

Active Publication Date: 2014-06-11
JINZHOU SWAN WELDING CONSUMABLES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing submerged arc welding wire can no longer meet the welding requirements of X100 pipeline steel, and there is an urgent need to develop a new type of submerged arc welding wire suitable for X100 welded pipe welding. The present invention has developed a welding wire for submerged arc welding that matches X100 pipeline steel

Method used

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  • Welding wire for submerged-arc welding of high-efficiency X100 pipeline steel and application of welding wire
  • Welding wire for submerged-arc welding of high-efficiency X100 pipeline steel and application of welding wire
  • Welding wire for submerged-arc welding of high-efficiency X100 pipeline steel and application of welding wire

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Experimental program
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Effect test

preparation example Construction

[0031] Among the present invention, the preparation method of welding wire for submerged arc welding of high-performance X100 pipeline steel, the specific steps are as follows:

[0032]Desulfurized molten iron is used to control the sulfur content of molten iron entering the furnace. Raw materials with low S and P content are selected. Converter steelmaking and top-bottom composite blowing process are used to control the C, S and P at the end of smelting at a low level. After deoxidation After alloying, use LF furnace and other refining process outside the furnace to add trace elements to smelt molten steel whose composition meets the requirements. The molten steel is fully protected and cast into continuous casting slabs by variety casting machines, and the continuous casting slabs are rolled into Φ5mm by high-speed twist-free rolling mill Wire rod, mechanical shelling of wire rod → pickling and rust removal → drying → dry wire drawing → coiling → heat treatment → dry wire dra...

Embodiment 1

[0034] In this embodiment, the welding wire steel of the present invention is smelted by an electric furnace. After smelting, the welding wire steel is drawn into a welding wire with a specification of Φ5mm, and its chemical composition (by weight percentage) is: C: 0.03wt.%, Mn: 1.6wt. %, Si: 0.2wt.%, Mo: 0.35wt.%, Ti: 0.08wt.%, B: 0.0035wt.%, Cr: 0.3wt.%, Cu: 0.25wt.%, Ni: 0.4wt.% , Nb: 0.06wt.%, S: 0.0036wt.%, P: 0.0044wt.%, and the balance is Fe. The welding wire mentioned above is used after copper plating on the surface (the thickness of the plating layer is not less than 1.25 μm).

[0035] In this embodiment, the welding wire is used in conjunction with SJ101-100 flux and X100 pipeline steel. The thickness of the X100 pipeline steel is 15mm, and the chemical composition is shown in Table 2 (the balance is Fe). The welding process parameters are: welding voltage 30V, welding current 550A, welding speed 44cm / min.

[0036] Table 2 Chemical composition of X100 pipeline st...

Embodiment 2

[0050] The difference from Example 1 is:

[0051] In this embodiment, the welding wire steel of the present invention is smelted by an electric furnace. After smelting, the welding wire steel is drawn into a welding wire with a specification of Φ5mm, and its chemical composition (by weight percentage) is: C: 0.02wt.%, Mn: 1.8wt. %, Si: 0.12wt.%, Mo: 0.35wt.%, Ti: 0.06wt.%, B: 0.0045wt.%, Cr: 0.33wt.%, Cu: 0.25wt.%, Ni: 0.48wt.% , Nb: 0.04wt.%, S: 0.0025wt.%, P: 0.0033wt.%, and the balance is Fe. The welding wire mentioned above is used after copper plating on the surface (the thickness of the plating layer is not less than 1.25 μm).

[0052] In this embodiment, the mechanical properties and impact properties of the welding wire deposited metal are shown in Table 6 and Table 7.

[0053] Table 6 Mechanical properties of welding wire deposited metal

[0054]

[0055] Table 7 Impact properties of welding wire deposited metal / J

[0056]

[0057] Such as image 3 As show...

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Abstract

The invention belongs to the field of a welding wire material, and particularly relates to a welding wire for submerged-arc welding of high-efficiency X100 pipeline steel and the application of the welding wire. The welding wire material comprises the chemical components in percentage by weight: 0.01-0.05 wt% of C, 1.4-2.1 wt% of Mn, 0.1-0.3 wt% of Si, 0.2-0.4 wt% of Mo, 0.05-0.1 wt% of Ti, 0.003-0.005 wt% of B, 0.1-0.4 wt% of Cr, 0.2-0.3 wt% of Cu, 0.3-0.6 wt% of Ni, 0.03-0.08 wt% of Nb, less than or equal to 0.005 wt% of S, less than or equal to 0.005 wt% of P, and the balance of Fe. The welding wire for the submerged-arc welding, disclosed by the invention is matched with an SJ101-100 welding flux deposited metal and has an excellent comprehensive mechanical property, the yield strength is greater than 690 MPa, the tensile strength is greater than 780MPa, and the impact work is greater than 108J in -20 DEG C; after welding, the forming of a welding seam is attractive, the defects of cracking, undercutting and the like do not exist, the strength is high, the toughness is good, the crack resistance is good, the welding seam has a good matching effect with the X100 pipeline steel, and the welding wire has a decisive function on performance of a weld metal as the welding wire is used as a main filling metal; according to the welding wire disclosed by the invention, the welding requirements of an oil and gas transmission pipeline under a situation of higher pressure are met.

Description

technical field [0001] The invention belongs to the field of welding wire materials for material forming, and in particular relates to a welding wire for submerged arc welding of high-performance X100 pipeline steel and its application. Background technique [0002] With the continuous construction and expansion of transportation pipelines such as oil and natural gas, especially in areas with harsh environments, the requirements for pipeline steel are more stringent. In order to meet the requirements of harsh environments and reduce production costs, new high-grade steel pipes have been developed in recent years. Pipeline steel and X100 pipeline steel. However, the development of matching welding wire is still relatively backward. There are already many patents on submerged arc welding wire for X80 pipeline steel. High Speed ​​Submerged Arc Welding Wire", Patent Application No. 200610124514.3 "High Toughness Submerged Arc Welding Wire for Low Alloy Ultra-High Strength Steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K9/18
CPCB23K9/18B23K35/3073B23K2101/10
Inventor 常敬刘越张庆红刘慧才艳秋
Owner JINZHOU SWAN WELDING CONSUMABLES
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