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Multi-component microalloying section molybdenum-type fire-resistant steel efficient welding process

A micro-alloying and multi-component compounding technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of brittle fracture in the joint area, loss of strengthening effect, deterioration of strength and toughness, etc., and achieve the reduction of phase transition temperature and the amount of solid solution Increase, the effect of excellent toughness

Inactive Publication Date: 2020-01-10
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the refractory steel is welded with large input energy, since the strength and toughness of the welding part, especially the welding heat-affected zone, will deteriorate with the increase of welding heat input, welding microstructures will easily occur and develop in the part with severe HAZ embrittlement during use. Cracks, leading to the possibility of brittle fracture in the joint area
In addition, due to the influence of welding heat cycle, there is also a phenomenon of loss of strengthening effect (strength loss)

Method used

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  • Multi-component microalloying section molybdenum-type fire-resistant steel efficient welding process

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Effect test

Embodiment 1

[0022] (1) The multi-component composite microalloyed molybdenum-section refractory steel plate Q420FRE is used, and the Q420FRE multiple-component composite micro-alloyed molybdenum-section refractory steel plate of the same plate thickness is used for butt joint, and the plate thickness combination is 16mm+16mm. The size of the test plate is 1200mm×460mm×16mm; the chemical composition and weight percentage of the steel plate are: C: 0.04~0.06%, Mn: 0.70~0.90%, Si: 0.15~0.25%, P: ≤0.010%, S: ≤ 0.003%, Nb: 0.050~0.15%, Ti: ≤0.01~0.025%, V: ≤0.10%, Mo: 0.15~0.20%, Al: 0.20~0.50%, the balance is Fe and unavoidable impurities; carbon equivalent Ceq ≤ 0.37%, cold crack sensitivity index Pcm ≤ 0.18%; the mechanical properties of the steel plate are: room temperature tensile strength Rm is 596MPa, yield strength ReH is 469MPa, 600°C high temperature yield strength is 387MPa, -40°C impact energy KV2 is 308J .

[0023] (2) The groove adopts Y-shaped groove, as attached figure 1 As s...

Embodiment 2

[0029] (1) The multi-component composite microalloyed molybdenum-section refractory steel plate Q420FRE is used, and the Q420FRE multi-component composite micro-alloyed molybdenum-section refractory steel plate of the same plate thickness is combined butt joint, and the plate thickness combination is 80mm+80mm. The size of the test plate is 1200mm×500mm×80mm; the chemical composition and weight percentage of the steel plate are: C: 0.04~0.06%, Mn: 0.70~0.90%, Si: 0.15~0.25%, P: ≤0.010%, S: ≤ 0.003%, Nb: 0.050~0.15%, Ti: ≤0.01~0.025%, V: ≤0.10%, Mo: 0.15~0.20%, Al: 0.20~0.50%, the balance is Fe and unavoidable impurities; carbon equivalent Ceq ≤ 0.37%, cold crack sensitivity index Pcm ≤ 0.18%; the mechanical properties of the steel plate are: the tensile strength Rm at room temperature is 576MPa, the yield strength ReH is 447MPa, the high temperature yield strength at 600°C is 349MPa, and the impact energy KV2 at -40°C is 333J .

[0030] (2) The groove adopts X-shaped groove, ...

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Abstract

The invention discloses a multi-component microalloying section molybdenum-type fire-resistant steel efficient welding process. Through the reasonable matching of welding materials and welding processes, under the welding condition of heat input of 120 kJ / cm, a welding joint can still obtain good high-temperature fire-resistant performance and excellent low-temperature impact toughness of -40 DEGC, the using requirements of building steel structures are met, the good comprehensive mechanical properties of the welding joint and the effect of considering the high efficiency of welding are achieved, welding operation is simple and convenient, and the multi-component microalloying section molybdenum-type fire-resistant steel efficient welding process can be applied to the high-rise buildingsin the central and southern regions of China as well as the cold regions.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material welding, and in particular relates to a high-efficiency welding process for multi-component composite microalloyed molybdenum-section refractory steel. Background technique [0002] The fire resistance of steel used in ordinary building structures is poor. As the temperature rises, its yield strength drops rapidly. When it does not have high temperature bearing capacity, the building will collapse in a short period of time, which will cause catastrophic damage to the steel structure building. Therefore, refractory coatings are usually used to protect the steel structure. The use of refractory coating not only doubles the cost of steel structure construction and prolongs the construction period, but also causes environmental pollution due to the splash of refractory coating spraying. With the rapid development of the high-rise building industry, based on the requirements of safety,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K35/30
CPCB23K9/18B23K35/0227B23K35/3073B23K2103/04
Inventor 李丽曲锦波韩丽梅田猛
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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